JP7178857B2 - Power management device and power management method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power management device and a power management method for obtaining economic balance in a power generation system including a retrofitted power generation device.

Patent Literature 1 discloses a power consumption measurement system capable of measuring power consumption for each load. This power consumption measurement system includes a plurality of loads installed in a consumer, a detection device provided corresponding to each of the plurality of loads, and a power consumption measurement unit that measures the power consumption related to the consumer. It has The detection device has a power supply unit that supplies power to each of a plurality of loads, and a detection unit that detects the amount of current flowing from the power supply unit to each of the loads.

The power consumption measurement unit calculates the power consumption of each load based on the amount of current detected by the detection unit and the voltage in the power supply circuit. As described above, in the power consumption measurement system of Patent Document 1, the detection device directly detects the amount of current flowing through each load, and the amount of power consumption of each load is measured according to the amount of current. Therefore, it is possible to measure the power consumption per load, not the power consumption per consumer, and estimate the charges corresponding to the power consumption.

In this case, even if a load is retrofitted in the customer, if a detection device is provided for the retrofitted load, it is possible to estimate the charges corresponding to the power consumption of the retrofitted load as well. Similarly, when a power generation device is retrofitted to the power generation system, if a detection device for detecting the power generation state of the retrofit power generation device is provided, the power generation state of the retrofit power generation device can be grasped at any time. Then, it is possible to make a trial calculation of the economic value, which is the merits and demerits of the charge based on the power generation amount indicating the power generation state.

Japanese Patent No. 5604089

However, in the power consumption measurement system of Patent Document 1, it is necessary to arrange a detection device for each of the plurality of loads in order to measure the power consumption of each of the plurality of loads. In addition, in order for the power consumption measurement unit to measure the power consumption, it is necessary to prepare wiring, communication, etc. so that the current amounts obtained by the detection device can be aggregated for each of the plurality of loads.

Even if a load is retrofitted to the power generation system, in order to measure the power consumption of the retrofitted load, it is necessary to prepare a detection device, wiring, communication, etc. corresponding to the retrofitted load. As a result, the cost required for equipment increases and the configuration becomes complicated.
Such a problem also occurs when a power generator is retrofitted to the power generation system. In other words, in order to grasp the economic value based on the retrofitted power generation device, it is necessary to prepare a detection device, wiring, communication, etc. corresponding to the retrofitted power generation device. Therefore, even when a retrofitted power generator is installed, there is a demand for a simple configuration and method for easily grasping the economic balance in consideration of the retrofitted power generator.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a simple power management device and a power management method capable of easily grasping the economic balance in consideration of a power generation device retrofitted to a power generation system. and

The characteristic configuration of the power management device according to the present invention is as follows:
An existing power generation device that can be interconnected with a power system via a power line, a retrofitted power generation device that can be interconnected with the power system via the power line, the power system, the existing power generation device, and A power management device that manages power in a power generation system including a power load device that receives power supply from at least one of the retrofitted power generation devices via the power line,
The power line is connected to the power system, the retrofitted power generation device, the existing power generation device and the power load device in this order from the upstream side,
A power measuring instrument is provided between a connection point of the retrofitted power generation device and a connection point of the existing power generation device on the power line,
a power generation information acquisition unit that acquires in advance a predetermined power generation amount of the retrofitted power generation device;
a balance acquisition unit that acquires the economic balance considering the retrofitted power generation device,
The income and expenditure acquisition unit
calculating a first economic value in a first period in which the amount of load power required by the power load device is greater than the amount of power generated by the existing power generation device;
In a second period in which the amount of load power required by the power load device is smaller than the amount of power generated by the existing power generation device, the selling price of the power generated by the retrofitted power generation device and the Calculation of the second economic value by multiplication with the amount of power generated by the power generation device;
and
In calculating the first economic value in the first period,
If the amount of power generated by the existing power generation device is insufficient with respect to the amount of load power and the amount of power shortage is smaller than the amount of power generated by the retrofitted power generation device, purchase of system power from the power system A first multiplication result obtained by multiplying the electricity price and the power shortage amount is obtained, and the power shortage amount is subtracted from the power generation amount of the retrofitted power generation device to obtain the reverse power power amount reversed to the power system. calculating, multiplying the power selling price of the power generated by the retrofitted power generation device and the reverse flow power amount to obtain a second multiplication result, and adding the first multiplication result and the second multiplication result Alternatively , if the amount of power shortage is greater than the amount of power generated by the retrofitted power generation device, the power purchase price of the system power from the power system and the retrofitted power Calculate the first economic value by multiplying the amount of power generated by the power generation device,
As the third economic value in the first period, from the result of multiplication of the purchase price of grid power from the power grid and the amount of power generated by the existing power generation device in the first period, calculating a value obtained by subtracting the multiplication result of the power purchase price of grid power and the amount of power supplied from the power grid side through the power line at the portion where the power meter is installed,
As the third economic value in the second period, the selling price of the power generated by the existing power generation device and the power line at the part where the power measuring instrument is installed in the second period. A value obtained by multiplying the surplus power amount to be supplied by the power purchase price of the system power from the power system and the power amount supplied to the power load device from the existing power generation device is added. Calculate the value obtained by
When calculating the economic balance in the first period, the value obtained by adding the calculated first economic value in the first period to the calculated third economic value in the first period is income and expenditure,
When calculating the economic balance in the second period, the value obtained by adding the calculated second economic value in the second period to the calculated third economic value in the second period is It is in terms of income and expenditure .

According to the above characteristic configuration, even if the power generation device is retrofitted to the power generation system, it is possible to obtain the economic balance in consideration of the retrofitting of the power generation device. Therefore, in addition to existing various processing means and existing display means already installed in the power generation system, detection means for detecting the power generation state of the retrofitted power generation device at any time, communication means for collecting the detected power generation state, There is no need to separately provide a processing means for calculating the economic balance of the entire power generation system by combining the power generated by the retrofitted power generation device and the power generated by the existing fuel cell device, and the display means for displaying the economic balance. Economic balance can be obtained easily with a simple configuration.

In the above configuration, it is assumed that the amount of power generated by the existing power generator is preferentially supplied to the power load device over the amount of power generated by the power generator installed later.
In addition, the power generation information acquisition unit acquires in advance the amount of power generated by the retrofitted power generation device. Examples of the power generation amount of the retrofitted power generation device include a constant power generation amount and an average power generation amount for a predetermined period.
In the first period, which has a relationship of load power>power generated by the already installed power generator, the power shortage in which the power generated by the already installed power generator is insufficient relative to the load power The first economic value is calculated as follows depending on the magnitude of the amount of power generated by the power generator.

First, in the first period, if the power shortage is smaller than the power generated by the retrofitted power generator, the power shortage is covered by the power generated by the retrofitted power generator. You don't need to buy power from the power grid alone. In this case, it is possible to simply obtain the first multiplication result as a merit by multiplying the power purchase price of the system power from the power system by the power shortage amount. Furthermore, it is assumed that the surplus after the retrofitted power generation device compensates for the power shortage in the power load device is reversed as the reverse flow power. In this case, it is possible to simply obtain the second multiplication result as an advantage by multiplying the power selling price of the power generated by the retrofitted power generation device and the reverse flow power amount. By adding the first multiplication result and the second multiplication result, the first economic value for the first period can be easily obtained.

Second, in the first period, if the amount of power shortage is greater than the amount of power generated by the retrofitted power generator, the power shortage is covered by the amount of power generated by the retrofitted power generator out of the power shortage. Therefore, it is not necessary to purchase power from the power system for the amount of power generated by the retrofitted power generator. In other words, all of the power generated by the retrofitted power generator is used to make up for the power shortage. In this case, it is possible to simply obtain the first economic value in the first period as a merit by multiplying the power purchase price of the system power from the power system by the amount of power generated by the retrofitted power generation device. In addition, since the entire amount of power generated by the retrofitted power generator is applied to the power shortage, there is no reverse power flow from the retrofitted power generator to the power system.

On the other hand, in the second period where the relationship of load power < power generated by the existing power generator, the power generated by the retrofitted power generator increases the amount of reverse power supplied to the power system. The second economic value based on the retrofitted power generation device in the second period can be easily obtained by multiplying the selling price of the power generated by the retrofitted power generation device in the second period by the generated power amount. The secondary economic value is generally evaluated as the economic value of merit.
Then, as the third economic value in the first period, from the result of multiplication of the power purchase price of the power system from the power system and the amount of power generated by the existing power generation equipment in the first period, the power system power from the power system Calculate the value obtained by subtracting the multiplication result of the power purchase price and the amount of power supplied from the power system side on the power line where the power meter is installed, and calculate the value obtained as the third economic value in the second period. The value obtained by multiplying the selling price of the power generated by the existing power generation equipment during the period by the surplus power supplied to the power system through the power line of the part where the power meter is installed, is the amount from the power system When calculating the value obtained by adding the value obtained by multiplying the power purchase price and the amount of power supplied to the power load device from the existing power generation device and calculating the economic balance in the first period, the calculated Economic balance is the value obtained by adding the calculated first economic value in the first period to the third economic value in the first period, and when calculating the economic balance in the second period, A value obtained by adding the calculated second economic value in the second period to the third economic value can be used as the economic balance.

A further characteristic configuration of the power management device according to the present invention is:
The already installed power generation device is a first fuel cell device,
The retrofitted power generation device is at least one power generation device including a second fuel cell device other than the first fuel cell device and a solar power generation device.

A further characteristic configuration of the power management device according to the present invention is:
It is characterized by including a display section for controlling the display of the economic balance.

According to the above characteristic configuration, even if a power generator is retrofitted to the power generation system, the economic balance based on the retrofitted power generator can be confirmed through the display unit.

The characteristic configuration of the power management method according to the present invention includes:
An existing power generation device that can be interconnected with a power system via a power line, a retrofitted power generation device that can be interconnected with the power system via the power line, the power system, the existing power generation device, and A power management method for managing power in a power generation system including a power load device that receives power supply from at least one of the retrofitted power generation devices via the power line,
The power line is connected to the power system, the retrofitted power generation device, the existing power generation device and the power load device in this order from the upstream side,
A power measuring instrument is provided between a connection point of the retrofitted power generation device and a connection point of the existing power generation device on the power line,
a power generation information acquisition step of acquiring in advance the amount of power generated by the retrofitted power generation device;
a balance acquisition step of acquiring an economic balance based on the retrofitted power generation device;
In the income and expenditure acquisition step,
calculating a first economic value in a first period in which the amount of load power required by the power load device is greater than the amount of power generated by the existing power generation device;
In a second period in which the amount of load power required by the power load device is smaller than the amount of power generated by the existing power generation device, the selling price of the power generated by the retrofitted power generation device and the Calculation of the second economic value by multiplication with the amount of power generated by the power generation device;
and
In calculating the first economic value in the first period,
If the amount of power generated by the existing power generation device is insufficient with respect to the amount of load power and the amount of power shortage is smaller than the amount of power generated by the retrofitted power generation device, purchase of system power from the power system A first multiplication result obtained by multiplying the electricity price and the power shortage amount is obtained, and the power shortage amount is subtracted from the power generation amount of the retrofitted power generation device to obtain the reverse power power amount reversed to the power system. calculating, multiplying the power selling price of the power generated by the retrofitted power generation device and the reverse flow power amount to obtain a second multiplication result, and adding the first multiplication result and the second multiplication result Alternatively , if the amount of power shortage is greater than the amount of power generated by the retrofitted power generation device, the power purchase price of the system power from the power system and the retrofitted power Calculate the first economic value by multiplying the amount of power generated by the power generation device ,
As the third economic value in the first period, from the result of multiplication of the purchase price of grid power from the power grid and the amount of power generated by the existing power generation device in the first period, calculating a value obtained by subtracting the multiplication result of the power purchase price of grid power and the amount of power supplied from the power grid side through the power line at the portion where the power meter is installed,
As the third economic value in the second period, the selling price of the power generated by the existing power generation device and the power line at the part where the power measuring instrument is installed in the second period. A value obtained by multiplying the surplus power amount to be supplied by the power purchase price of the system power from the power system and the power amount supplied to the power load device from the existing power generation device is added. Calculate the value obtained by
When calculating the economic balance in the first period, the value obtained by adding the calculated first economic value in the first period to the calculated third economic value in the first period is income and expenditure,
When calculating the economic balance in the second period, the value obtained by adding the calculated second economic value in the second period to the calculated third economic value in the second period is It is in terms of income and expenditure .

According to the characteristic configuration described above, it is possible to obtain the same effects as those of the power management device described above.

1 is a configuration diagram of a power generation system according to an embodiment; FIG. 1 is a configuration diagram of a power management device; FIG. When power is preferentially supplied from the already installed fuel cell device to the power load device, in the first period (load power amount > generated power amount of the already installed fuel cell device), the insufficient power amount is the retrofitted solar power FIG. 4 is an explanatory diagram showing the flow of electric power when the amount of electric power generated is smaller than the amount of electric power generated by the power generation device; When power is preferentially supplied from the already installed fuel cell device to the power load device, in the first period (load power amount > generated power amount of the already installed fuel cell device), the insufficient power amount is the retrofitted solar power FIG. 5 is an explanatory diagram showing the flow of electric power when the amount of generated electric power is greater than the amount of electric power generated by the power generation device; FIG. 10 is an explanatory diagram showing the flow of electric power in a second period (load power amount<power generation amount of the already installed fuel cell apparatus) when power is preferentially supplied to the power load apparatus from the already installed fuel cell apparatus; .

In the power generation system according to the present embodiment described below, in addition to the power generation device already installed in the power generation system (referred to as an existing power generation device), a power generation device is retrofitted (referred to as an aftermarket power generation device). In addition, the power generation system is also connected to the power grid, and the power load device that consumes power receives power from at least one of the existing power generation device, the retrofitted power generation device, and the power grid. In addition, in the power generation system according to the present embodiment, even if a power generation device is installed as a retrofit, it is possible to easily grasp the economic balance in consideration of the retrofit power generation system.
In the following embodiments, when power is supplied to power load devices in the power generation system, a configuration in which generated power is preferentially supplied from an existing power generation device over a retrofitted power generation device will be described as an example.

[Embodiment]
A power generation system according to an embodiment will be described below with reference to the drawings.
(1) Overall Configuration of Power Generation System The power generation system 100 of FIG. 1 includes a solar power generation device 20, a fuel cell device 30 having a power management device 50, and a power load device 40 that consumes power. Solar power generation device 20 , fuel cell device 30 , and power load device 40 are connected to power system 10 via power line 11 . The solar power generation device 20 and the fuel cell device 30 are configured to be interconnectable with the power system 10 .

In the power generation system 100 , the photovoltaic power generation device 20 is installed behind the fuel cell device 30 and the power load device 40 . In other words, the power generation system 100 is configured by retrofitting the solar power generation device 20 to the power generation system 100 while the fuel cell device 30 and the power load device 40 are already installed in the power generation system 100. there is Below, the photovoltaic power generation device 20 is referred to as a retrofitted photovoltaic power generation device (the device with the suffix “new” in FIG. 1 and later-described FIGS. 3A, 3B, and 4) 20, and the fuel cell device 30 is an existing installation. It is referred to as a fuel cell device (the device with the suffix “old” in FIG. 1 and later-described FIGS. 3A, 3B, and 4 ) 30 .

In the power generation system 100 of FIG. 1 , each device is connected via the power line 11 , so that the power load device 40 receives power generated by the already installed fuel cell device 30 and system power from the power system 10 . and power generated by the retrofitted photovoltaic power generation device 20 . In this embodiment, generated power is supplied to the power load device 40 preferentially from the installed fuel cell device 30 rather than the retrofitted solar power generation device 20 . In FIG. 1 and FIGS. 3A, 3B, and 4, which will be described later, the existing fuel cell device 30 that preferentially supplies generated power to the power load device 40 is denoted by the suffix #1.

A power system 10 , a retrofitted photovoltaic power generation device 20 , an already installed fuel cell device 30 , and a power load device 40 are connected to the power line 11 in this order from the upstream side. The retrofitted photovoltaic power generation device 20 and the existing fuel cell device 30 are each connected to the power line 11 via a branch line (not shown) branched from a connection point (not shown) of the power line 11. . A power meter CT1 is provided on the power line 11 between the connection point of the retrofitted solar power generation device 20 and the connection point of the already installed fuel cell device 30 . The power meter is composed of a current transformer (CT) for measuring the current value of power, and based on the product of the measured current value and a predetermined voltage (for example, 100 V, 200 V), the power line 11 Calculate the amount of power in

The power management device 50 obtains the economic balance of the power generation system 100 . As described above, the retrofitted photovoltaic power generation device 20 is retrofitted to the power generation system 100 . Moreover, the power management device 50 cannot grasp the power generation state of the retrofitted solar power generation device 20 . Therefore, the power management device 50 calculates the economic balance without considering the power generation state of the retrofitted photovoltaic power generation device 20 . In this case, the actual economic balance considering the power generation state of the retrofitted solar power generation device 20 and the economic balance calculated by the power management device 50 without considering the power generation state of the retrofitted solar power generation device 20 An error occurs between Therefore, the power management device 50 calculates the economic balance in consideration of the power generation state of the retrofitted photovoltaic power generation device 20 and suppresses the aforementioned error. The calculation method of the economic balance will be explained in detail later.
In addition, the power management device 50 manages the operating state of the installed fuel cell device 30 so as to achieve a predetermined operating state, for example.

(2) Configuration of Power Management Apparatus Next, the power management apparatus 50 according to the present embodiment will be further described.
In this embodiment, in the power generation system 100 shown in FIG. 1, in addition to the already installed fuel cell device 30 and power load device 40, a retrofitted photovoltaic power generation device 20 is added. However, in the power generation system 100 of this embodiment, the power management device 50 cannot grasp the power generation state of the retrofitted photovoltaic power generation device 20 . The power generation state cannot be grasped because, for example, a current measuring device for grasping the power generation state of the retrofitted photovoltaic power generation device 20 is not provided. Further, for example, even if a current measuring device is provided for the retrofitted solar power generation device 20, the power generation state detected by the current measuring device is transmitted to the power management device 50. This is because the power management device 50 cannot grasp the power generation state because the power management device 50 is not
In this embodiment, in the power generation system 100 including the retrofitted photovoltaic power generation device 20 whose power generation state cannot be grasped, the power management device 50 obtains the economic balance in consideration of the retrofitted photovoltaic power generation device 20. configuration is adopted.

As shown in FIG. 2 , the power management device 50 of the present embodiment includes a power generation information acquisition unit 51 that acquires the amount of power generated by the retrofitted solar power generation device 20 and an economic balance calculation that takes into account the retrofitted solar power generation device 20 . a power selling price acquiring unit 55 that acquires the power selling price to the power system 10; and a power purchase price acquiring unit 57 that acquires the power buying price from the power system 10 , a display unit 58 for displaying the economic balance, and a generated power management unit 59 for acquiring various data from the already installed fuel cell device 30 and controlling the already installed fuel cell device 30, and the like. The functional units of each unit will be further described below.

(2-1) Power Generation Information Acquisition Unit The power generation information acquisition unit 51 receives an input of the amount of power generated by the retrofitted photovoltaic power generation device 20 from the installer or the like, for example, when the retrofitted photovoltaic power generation device 20 is installed. The power generation amount of the photovoltaic power generation device 20 is, for example, a preset value instead of an actual measurement value. In the present embodiment, the average value of the power generation amount of the photovoltaic power generation device 20 over a first period or a second period, which will be described later, is used.
In addition, since the amount of power generated by a photovoltaic power generation system depends on the time period such as daytime and nighttime and weather, etc., for example, the average amount of power generated for each time period, day, month, season, etc. can be mentioned. In the following embodiments, the power generation amount of the retrofitted photovoltaic power generation device 20 will be described with an example of an average power generation amount that does not change depending on the time of day, day, or the like.

However, the power generation information acquisition unit 51 acquires the amount of power generation according to the amount of power generated by the retrofitted photovoltaic power generation device 20 that differs for each time slot, day, month, season, or the like. may For example, the amount of power generated during the day from 6:00 to 18:00 (for example, 17:59:59) and the power generated at night from 18:00 to 6:00 (for example, 5:59:59) The power generation amount can be acquired for each of a plurality of time periods, such as the power amount. Also, for example, it is possible to acquire the amount of power generated in spring, summer, autumn, and winter in a year.

In addition, the power generation amount of the retrofitted solar power generation device 20 is not limited to the configuration that is accepted when the retrofitted solar power generation device 20 is installed, and the power generation system 100 is used when the retrofitted solar power generation device 20 is started to be used. may be received from a user or the like.
The power generation information acquisition unit 51 inputs the power generation amount of the retrofitted photovoltaic power generation device 20 to the balance acquisition unit 53 .

(2-2) Power Selling Price Acquisition Unit The power selling price acquirer 55 receives the power generated by the retrofitted photovoltaic power generation device 20 and the power generated by the already installed fuel cell device 30 in reverse to the power system 10. Acquire the selling price of electricity when the tide is high. The power selling price acquisition unit 55 acquires, for example, the price per 1 kWh of generated power as the power selling price. If the power selling price fluctuates, for example, hourly, day by day, season by season, yearly, etc., the power selling price acquisition unit 55 may acquire an updated power selling price according to the time of change. good.
The power selling price acquisition unit 55 acquires the power selling price from, for example, an electric power company. Then, the power selling price acquiring unit 55 inputs the acquired power selling price to the balance acquiring unit 53 .

(2-3) Power Purchase Price Acquisition Unit The power purchase price acquisition unit 57 acquires the power purchase price of system power in the power system 10 . The power purchase price acquisition unit 57 acquires, for example, the price per 1 kWh of grid power as the power purchase price. If the power purchase price fluctuates, for example, hourly, day by day, season by season, year by year, etc., the power purchase price acquisition unit 57 may acquire an updated power purchase price according to the time of change. good.
The power purchase price acquisition unit 57 acquires the power purchase price from, for example, an electric power company. Then, the power purchase price acquisition unit 57 inputs the acquired power purchase price to the balance acquisition unit 53 .

(2-4) Power Generation Management Section The power generation management section 59 controls power generation in the already installed fuel cell device 30 . The generated power management unit 59 controls, but is not limited to, for example, the already installed fuel cell device 30 to operate at rated power so that the generated power is constant at a predetermined set generated power. The generated power management unit 59 also acquires the amount of power on the power line 11 from the power meter CT<b>1 and inputs the acquired amount of power to the balance acquisition unit 53 .
In addition, the generated power management unit 59 acquires the generated power amount (kWh) generated by the already installed fuel cell device 30 in order to grasp the power generation state of the already installed fuel cell device 30, for example.

(2-5) Display Unit The display unit 58 displays the economic balance in consideration of the retrofitted photovoltaic power generation device 20 acquired by the balance acquisition unit 53 described later on a display device (not shown). The display device is an existing display device provided in the power generation system 100 . As a result, even when the photovoltaic power generation device 20 is retrofitted to the power generation system 100, the economic balance in consideration of the retrofitted photovoltaic power generation device 20 can be confirmed on the display device. Further, the display unit 58 may acquire the amount of power generated by the installed fuel cell device 30 from the power generation management unit 59 and display it on the display device.

(2-6) Balance Acquisition Unit The balance acquisition unit 53 obtains the economic balance of the power generation system 100 . The balance acquisition unit 53 corrects the economic value (hereinafter referred to as the third economic value) calculated without considering the power generation state of the retrofitted solar power generation device 20, and corrects the power generation state of the retrofitted solar power generation device 20. Calculate the actual economic balance taken into consideration.
The third economic value is an economic value calculated without considering the power generation state of the retrofitted solar power generation device 20 even though the retrofitted solar power generation device 20 was installed in the power generation system 100 later. . Therefore, the balance acquisition unit 53 corrects the third economic value in order to calculate the economic balance of the entire power generation system 100 in consideration of the power generation state of the retrofitted photovoltaic power generation device 20 .

Specifically, the balance acquisition unit 53 calculates the third economic value based on the information acquired from the existing detection device or the like without considering the power generation state of the retrofitted photovoltaic power generation device 20 . Then, the balance acquisition unit 53 adds the economic value (the first economic value and the second economic value described below) when considering the power generation state of the retrofitted photovoltaic power generation device 20 to the third economic value. Thus, the economic balance of the power generation system 100 as a whole is calculated.

Hereinafter, first, the method for calculating the third economic value will be described, then the method for calculating the first and second economic values will be described, and finally, the overall power generation system 100 considering the power generation state of the retrofitted solar power generation device 20 will be described. Explain how to calculate the economic balance.

(2-6-1) Third Economic Value The balance acquisition unit 53 calculates the third economic value based on the amount of power acquired from the power meter CT1 (FIG. 1).
First, the balance acquisition unit 53 acquires various types of information when calculating the third economic value. For example, the balance acquisition unit 53 acquires the power amount in the power meter CT1 from the power meter CT1. In addition, the income/expenditure acquisition unit 53 acquires the selling price of the power generated by the retrofitted solar power generation device 20 and the selling price of the power generated by the existing fuel cell device 30 from the selling price acquisition unit 55. Then, the power purchase price of the grid power is acquired from the power purchase price acquisition unit 57 .

(a) Power meter CT1=0
Here, when the load power amount of the power load device 40 and the generated power amount of the installed fuel cell device 30 are equal, the power amount acquired by the power meter CT1 becomes zero. Therefore, the power load device 40 is supplied with the power generated by the already installed fuel cell device 30 , and there is no need to purchase system power from the power system 10 . Assuming that the power purchase price of grid power is β yen/kWh and the amount of power generated by the existing fuel cell device 30 is BkWh, the third economic value is expressed by (Equation 1).
Third economic value = β x B (Equation 1)

(b) Power meter CT1=positive In addition, the load power amount of the power load device 40 is larger than the generated power amount of the already installed fuel cell device 30 (load power>the generated power amount of the already installed fuel cell device 30). In case B) (hereinafter referred to as the first period), that is, when power shortage occurs, the amount of power acquired by the power meter CT1 is, for example, a positive value. Therefore, the power measuring instrument CT1 measures the system power amount (purchased power amount) purchased from the power system 10, and the power load device 40 receives the system power amount (purchased power amount) and the existing The power generated by the installed fuel cell device 30 is being supplied.
Note that the power value measured by the power meter CT1 of the power line 11 becomes a positive value when positive power is flowing toward the power load device 40 in the power meter CT1. The explanation is based on the premise that it becomes a negative value when positive power flows through. However, the value of the amount of power measured by the power meter CT1 is shown as an absolute value.

In this case, the balance acquisition unit 53 obtains the purchase price of the grid power from the power grid 10 and The third economic value is calculated based on the result of subtracting the multiplication result from the purchased power amount EkWh (the power value obtained by the power meter CT1). In other words, all of the generated power generated by the already installed fuel cell device 30 is supplied to the power load device 40, and it is the power that no longer needs to be purchased from the power system 10, so when calculating the third economic value is multiplied by the power selling price of the system power by all the generated power amounts of the fuel cell devices 30 already installed. Then, the multiplication result of the power purchase price of the grid power from the power grid 10 and the purchased power amount EkWh (the power value obtained by the power meter CT1) purchased from the power grid 10 is subtracted from the multiplication result.
Here, assuming that the power purchase price of grid power is β yen/kWh and the power generation amount of the already installed fuel cell device 30 is BkWh, the third economic value is expressed by (Equation 2).
Third economic value = β x B - β x E (Formula 2)

(c) Power meter CT1=negative In addition, the load power amount of the power load device 40 is smaller than the generated power amount of the already installed fuel cell device 30 (load power amount<the generated power amount of the already installed fuel cell device 30). In case B) (hereinafter referred to as the second period), that is, when surplus power occurs, the amount of power acquired by the power meter CT1 is, for example, a negative value. Surplus power is reverse-fed to the power system 10 from the already installed fuel cell device 30 . Therefore, the power meter CT1 measures the amount of reverse flow power (sold power amount) DkWh from the already installed fuel cell device 30 to the power system 10 .

In this case, the balance acquisition unit 53 multiplies the power selling price of the generated power generated by the already installed fuel cell device 30 by the selling power amount DkWh, A value obtained by multiplying the power amount ((B−D) kWh) supplied from the installed fuel cell device 30 to the power load device 40 is added, and the third economic value is calculated based on the value after the addition. . That is, part of the amount of power generated by the already installed fuel cell device 30 is reverse-fed to the power system 10 (the amount of power sold as described above), and the other part is supplied to the power load device 40. When calculating the third economic value, a value obtained by multiplying the power selling amount DkWh by the power selling price, and a value obtained by multiplying the power amount (BD)kWh supplied to the power load device 40 by the power purchase price are used. Add
Here, if the selling price of the generated power generated by the fuel cell device 30 is α yen/kWh, and the selling power amount is DkWh (the power value obtained by the power meter CT1), the third economic value is (Equation 3: ).
Third economic value = (α × D) + β (BD) (Formula 3)
Note that when D is a negative value in (Formula 3), D indicates an absolute value.

Then, the income/expenditure acquisition unit 53 calculates the third economic value for the whole including the first and second periods based on the above (formula 1) to (formula 3).

(2-6-2) First and Second Economic Values Next, a method for calculating the first and second economic values will be described.
The balance acquisition unit 53 obtains the power value acquired by the power meter CT1, the amount of power generated by the retrofitted solar power generation device 20, the selling price of the power generated by the retrofitted solar power generation device 20, and the installed fuel. Based on the power selling price of the power generated by the battery device 30 and the power buying price of the grid power, the economic balance due to the provision of the retrofitted photovoltaic power generation device 20 in the power generation system 100 is acquired.

The economic value obtained by installing the retrofitted photovoltaic power generation device 20 differs in calculation method depending on the magnitude relationship between the amount of load power and the amount of power generated by the already installed fuel cell device 30 . Therefore, a method of obtaining an economic value in the power generation system 100 will be described with reference to FIGS. 3A, 3B and 4. FIG. FIGS. 3A and 3B show a first period in which the amount of load power required by the power load device 40 is greater than the amount of power generated BkWh by the existing fuel cell device 30 (load power > existing fuel cell device). 30 power generation), the power flow is shown. In the first period, the first economic value based on the retrofitted photovoltaic power generation device 20 is obtained. FIG. 4 shows a second period in which the amount of load power required by the power load device 40 is smaller than the amount of generated power BkWh of the already installed fuel cell device 30 (load power <power generated by the already installed fuel cell device 30). power flow) is shown. In the second period, a second economic value based on the retrofitted photovoltaic power generation device 20 is obtained.

First, the balance acquisition unit 53 acquires various types of information when acquiring the first and second economic values.
For example, the income/expenditure acquisition unit 53 acquires, for example, the annual average power generation output amount AkWh of the retrofitted photovoltaic power generation device 20 from the power generation information acquisition unit 51 . The photovoltaic power generation device 20 normally generates different amounts of power depending on the time period such as daytime and nighttime and the weather. It is assumed that the power generation amount of the device 20 is averaged, and the power generation output amount is assumed to be constant AkWh regardless of the time period or the like.
Also, the balance acquisition unit 53 acquires the power amount from the power meter CT1.

In addition, the income/expenditure acquisition unit 53 acquires the selling price of the power generated by the retrofitted solar power generation device 20 and the selling price of the power generated by the existing fuel cell device 30 from the selling price acquisition unit 55. Then, the power purchase price of the grid power is acquired from the power purchase price acquisition unit 57 .

When the power value measured by the power meter CT1 is a positive value, the balance acquisition unit 53 sets the period in which the load power amount>the generated power amount B of the installed fuel cell device 30 as the first period. When the electric power value measured by the measuring device CT1 is a negative value, that is, the period in which the load electric energy <the generated electric energy B of the installed fuel cell device 30 is defined as the second period. The balance acquisition unit 53 calculates the first economic value of the retrofitted photovoltaic power generation device 20 in the first period and the second economic value of the retrofitted photovoltaic power generation device 20 in the second period.

(a) First Economic Value of Retrofitted Photovoltaic Power Generation Device 20 in First Period Next, a method of calculating the first economic value of the retrofitted photovoltaic power generation device 20 in the first period will be described.
In the entire first period shown in FIGS. 3A and 3B, the generated power is preferentially supplied to the power load device 40 from the already installed fuel cell device 30 over the retrofitted photovoltaic power generation device 20. The amount of electric power generated by the fuel cell device 30 is not enough to cover the amount of electric power on the load. 3A and 3B, the power value measured by the power meter CT1 is EkWh, and EkWh is supplied from the power system 10 side to the power load device 40 side as the power shortage. At this time, the generated power amount of the already installed fuel cell device 30 is B kWh, and the load power amount is (E+B) kWh. Here, the retrofitted photovoltaic power generation device 20 is operated at the power generation output amount AkWh. Therefore, the power load device 40 receives all or part of the power shortage from the retrofitted photovoltaic power generation device 20 via the power line 11 .

The calculation method of the first economic value differs depending on the size relationship between the power shortage EkWh measured by the power meter CT1 and the power generation output amount AkWh of the retrofitted photovoltaic power generation device 20 . Therefore, with reference to FIG. 3A, a method of calculating the first economic value when the power shortage EkWh is smaller than the power generation output AkWh of the retrofitted photovoltaic power generation device 20 (E<A) will be described. After that, with reference to FIG. 3B, a method of calculating the first economic value when the power shortage EkWh is larger than the power generation output AkWh of the retrofitted photovoltaic power generation device 20 (E>A) will be described.

(a-1) First economic value at E<A As shown in FIG. All of the power shortage EkWh is supplied from the retrofitted photovoltaic power generation device 20 via the solar power generation device 20 . The balance acquisition unit 53 calculates the economic value when the retrofitted photovoltaic power generation device 20 supplements the power shortage EkWh as the following first multiplication result.

Furthermore, as described above, since E<A, the power load device 40 uses part of the power generation output amount AkWh of the retrofitted photovoltaic power generation device 20 . Therefore, the surplus power generation output amount (AE) kWh after the retrofitted photovoltaic power generation device 20 compensates for the power shortage EkWh is supplied to the power system 10 as the reverse power amount. The balance acquisition unit 53 calculates the economic value of the retrofitted photovoltaic power generation device 20 in the case of reverse power flow to the power system 10 as the following second multiplication result.
The balance acquisition unit 53 calculates the first economic value of the retrofitted photovoltaic power generation device 20 by adding the first multiplication result and the second multiplication result. A method of calculating the first and second multiplication results will be described below.

(i) First multiplication result As described above, in the first period, the power shortage EkWh is supplemented by the retrofitted solar power generation device 20, so there is no need to buy grid power from the power grid 10, and the power generation system 100 This reduces costs for users. The balance acquisition unit 53 multiplies the economic value of the retrofitted photovoltaic power generation device 20 in the first period, which is the cost reduction, by the power purchase price of the grid power and the amount of power shortage, and obtains the following first multiplication result: Calculate as
Here, assuming that the power purchase price of grid power is β yen/kWh, the result of the first multiplication is given by (Equation 4).
First multiplication result=β×E (Equation 4)

In the first period in which the relation of load electric power>the electric power generated by the installed fuel cell device 30 is established, it is assumed that the solar power generation device 20 installed afterward compensates for the insufficient electric power. In this case, assuming that it is not necessary to purchase power from the power system 10 for the amount of power shortage, the first multiplication result can be easily obtained as the economic value of the retrofitted photovoltaic power generation device 20 by the above (Equation 4). The first multiplication result is generally evaluated as the economic value of the merit.

(ii) Second multiplication result In the first period, the surplus amount after the retrofitted photovoltaic power generation device 20 supplements the power load device 40 with the power shortage EkWh is the reverse flow power amount to the power system 10. Therefore, users of the power generation system 100 can earn profits. By subtracting the power shortage EkWh from the power generation amount AkWh of the retrofitted photovoltaic power generation device 20 in the first period, the reverse flow power amount (AE) kWh is obtained. The balance acquisition unit 53 multiplies the economic value of the first period due to the reverse flow by the power selling price of the power generated by the retrofitted solar power generation device 20 and the reverse flow power amount (AE) kWh to obtain the following It is calculated as a result of squaring.

Here, if the power selling price of the power generated by the retrofitted photovoltaic power generation device 20 is α yen/kWh, the second multiplication result is expressed by (Equation 5).
Second multiplication result=α×(A−E) (Equation 5)

By assuming that the surplus after the retrofitted photovoltaic power generation device 20 compensates for the shortage of power in the power load device 40 is reversed as the reverse flow power, the retrofitted photovoltaic power generation is obtained by the above (Equation 5) A second multiplication result can be easily obtained as an economic value by the device 20 . The second multiplication result is generally evaluated as the economic value of the merit.

In the case of the power shortage E<power generation output A of the solar power generation device 20, the addition of the first multiplication result and the second multiplication result yields the first period (load power amount> power generation of the installed fuel cell device 30 generated power), the first economic value based on the retrofitted photovoltaic power generation device 20 can be calculated.

(a-2) First economic value at E>A As shown in FIG. Through the solar power generation device 20, which is installed afterward, a power generation output amount A is supplied, and a part of the electric power shortage EkWh is covered. That is, all of the power generation amount A of the retrofitted photovoltaic power generation device 20 is used to make up for the power shortage. The balance acquisition unit 53 calculates the economic value when the retrofitted photovoltaic power generation device 20 covers a part of the power shortage EkWh as the first economic value below.
Here, assuming that the power purchase price of grid power is β yen/kWh, the first economic value is shown by (Equation 6).
First economic value = β x A (Formula 6)

In this case, since all of the power generation AkWh of the retrofitted solar power generation device 20 is used to cover the power shortage, there is no reverse power flow from the retrofitted solar power generation device 20 to the power system 10 . Also, a portion (EA) kWh of EkWh, which is a power shortage that cannot be covered by the generated power amount AkWh, is covered by the electric power system 10 .

(b) Second economic value of retrofitted photovoltaic power generation device 20 in second period On the other hand, in the entire second period shown in FIG. , the generated power amount is supplied to the power load device 40 preferentially from the installed fuel cell device 30 over the retrofitted solar power generation device 20, but the generated power amount supplied from the already installed fuel cell device 30 can cover the load power. According to FIG. 4, the power value measured by the power meter CT1 is DkWh, and DkWh is being reverse-fed to the power system 10 from the already installed fuel cell device 30 as the reverse-flow power amount. Incidentally, the power generation amount of the already installed fuel cell device 30 is BkWh, and the load power amount is (BD) kWh.

Here, the retrofitted photovoltaic power generation device 20 is operated at the power generation output amount AkWh. Since part of the power generated by the already installed fuel cell device 30 is supplied in reverse and there is no shortage of power in the power load device 40, the power output AkWh of the retrofitted photovoltaic power generation device 20 does not exceed the power system Backflow at 10. As a result, users of the power generation system 100 can earn profits. The balance acquisition unit 53 multiplies the economic value of the retrofitted photovoltaic power generation device 20 in the second period by the power selling price of the power generated by the retrofitted photovoltaic power generation device 20 and the reverse flow power amount AkWh to obtain the following: 2 Calculated as economic value.

Here, if the power selling price of the power generated by the retrofitted photovoltaic power generation device 20 is α yen/kWh, the second economic value is shown by (Equation 7).
Second economic value=α×A (Formula 7)
In calculating the second economic value, assuming that all the power generated by the retrofitted solar power generation device 20 is reversed, the second economy value can be easily obtained.
The secondary economic value is generally evaluated as the economic value of merit.

The balance acquisition unit 53 acquires at least one of the first economic value in the first period and the second economic value in the second period as the economic value based on the retrofitted photovoltaic power generation device 20 based on the calculation method described above. do. Alternatively, the balance acquisition unit 53 calculates the economic value based on the retrofitted photovoltaic power generation device 20 over the entire period including the first period and the second period based on the first economic value and the second economic value. may be obtained.

(2-6-3) Economic balance of the entire power generation system 100 Next, the balance acquisition unit 53 corrects the third economic value using at least one of the first and second economic values, Calculate the economic balance of Accordingly, the balance acquisition unit 53 can calculate the economic balance of the entire power generation system 100 in consideration of the power generation state of the retrofitted photovoltaic power generation device 20 .

To explain, the above-mentioned third economic value is calculated using the power value obtained by the power meter CT1. Assuming that the price of electricity is β yen/kWh and the amount of power generated by the existing fuel cell device 30 is BkWh, the third economic value=β×B (Equation 1) is obtained. Further, when the amount of power acquired by the power meter CT1 is a positive value, the amount of power purchased from the power system 10 is EkWh (the power value acquired by the power meter CT1), and the third economic value = β ×B−β×E (Formula 2) is obtained. Further, when the power value acquired by the power meter CT1 is a negative value, the selling price of the power generated by the already installed fuel cell device 30 is α yen/kWh, and the selling power amount is DkWh (power The third economic value=(α×D)+β(BD) (Equation 3) was obtained as the electric power value obtained by the measuring device CT1).

The third economic value calculated in this way has the following problems.
In the entire first period, the power value acquired by the power meter CT1 includes the power value supplied from the retrofitted photovoltaic power generation device 20 to the power load device 40, and is calculated by (Equation 2). The third economic value is a value calculated under the assumption that an extra amount of power supplied from the retrofitted photovoltaic power generation device 20 was purchased from the power system 10 . That is, since the power generation system 100 is not provided with a power detector, communication means, or the like for grasping the power generation state of the retrofitted photovoltaic power generation device 20, all of the power amount detected by the power meter CT1 is It is erroneously determined to be system power from the power system 10 .

In addition, in the entire second period, the power value acquired by the power meter CT1 includes only the power value reverse-fed to the power system 10 from the already installed fuel cell device 30, and (Equation 3) The third economic value calculated by is a value calculated in a state in which the reverse flow power amount from the retrofitted photovoltaic power generation device 20 to the power system 10 cannot be grasped. That is, since the power generation system 100 is not provided with a power detector, communication means, or the like for grasping the power generation state of the retrofitted photovoltaic power generation device 20, the power amount detected by the power meter CT1 is 10 is erroneously understood to be the total amount of power reversed to 10.

Therefore, when correcting the third economic value using both the first and second economic values, the balance acquisition unit 53 adds the first economic value to the third economic value in the entire first and second periods, and By adding the second economic value, the third economic value is corrected, and the economic balance of the entire power generation system 100 in the first and second periods is calculated in consideration of the power generation state of the retrofitted solar power generation device 20. do.
Note that, for example, when obtaining only the third economic value in the first period, the balance acquisition unit 53 adds the first economic value in the first period to the third economic value in the first period, The economic balance of the entire power generation system 100 in the first period may be calculated in consideration of the power generation state of the photovoltaic device 20 . Similarly, for example, when obtaining only the third economic value in the second period, the balance acquisition unit 53 adds the second economic value in the second period to the third economic value in the second period, The economic balance of the entire power generation system 100 in the second period may be calculated in consideration of the power generation state of the photovoltaic power generation device 20 .

(2-6-4) Effect The balance acquisition unit 53 calculates at least one of the first economic value in the first period and the second economic value in the second period based on the calculation method described above, An economic balance based on the photovoltaic power generation device 20 is obtained. Alternatively, the balance acquisition unit 53 calculates the first economic value and the second economic value, and acquires the economic balance over the entire period including the first period and the second period, taking into consideration the retrofitted solar power generation device 20. .
Then, these acquired economic balances can be displayed on existing display means or the like.

According to the configuration according to the present embodiment, even if the solar power generation device 20 is retrofitted to the power generation system 100, the economic balance can be obtained in consideration of the retrofitting of the solar power generation device 20 . Therefore, in addition to the existing various processing means and existing display means already installed in the power generation system 100, detection means for detecting the power generation state of the retrofitted solar power generation device 20 at any time, and the detected power generation state are aggregated. communication means, processing means for calculating the economic balance of the entire power generation system 100 by combining the power generated by the retrofitted solar power generation device 20 and the power generated by the existing fuel cell device 30, etc., and a display for displaying the economic balance Economic balance can be obtained easily with a simple configuration without the need to separately provide means or the like.

As described above, in the first period shown in FIGS. 3A and 3B, using the power amount detected by the power meter CT1, if the power amount detected by the power meter CT1 is a positive value, Assuming that the power purchase price is β yen/kWh, the amount of power generated by the existing fuel cell device 30 is B, and the amount of power purchased from the power system 10 is EkWh, the third economic value = β x B - β x E. (Formula 2) is obtained. In this case, the display unit 58 included in the power management device 50 of the installed fuel cell device 30 erroneously displays β×E of the third economic value as the power purchase amount. In other words, since the purchased power amount actually includes the amount corresponding to the amount of power supplied from the retrofitted solar power generation device 20, the purchased power amount is the grid power actually supplied from the power system 10. The amount is larger than the amount corresponding to the volume.

Further, as described above, in the second period shown in FIG. 4, when the amount of power detected by the power meter CT1 is a negative value, Assuming that the selling price of the power generated by the fuel cell device 30 is α yen/kWh, and the selling power amount is D (the power value obtained by the power meter CT1), the third economic value = (α × D) + β (B−D) . . . (Formula 3) is obtained. In this case, the display unit 58 provided in the power management device 50 of the already installed fuel cell device 30 erroneously displays only (α×D) of the third economic value as the power selling amount. In other words, in reality, the amount of power sold does not include the amount of power sold based on the amount of reverse-flow power that is reverse-fed from the retrofitted solar power generation device 20. Therefore, the power that is actually reverse-fed to the power system 10 The amount is less than the amount corresponding to the volume.

Furthermore, as described above, when the third economic values are calculated in the first and second periods, respectively, and these third economic values are added to obtain the economic balance of the entire power generation system 100, the existing fuel cell device The display unit 58 of the power management device 50 of 30 erroneously displays the economic balance as the actual economic balance.

When the balance acquisition unit 53 calculates the third economic value and displays the purchased power amount, the sold power amount, and the economic balance, the above-described erroneous display is performed. However, the balance acquisition unit 53 of the present embodiment corrects the third economic value and calculates the economic balance taking into account the power generation state of the retrofitted photovoltaic power generation device 20 . Therefore, erroneous display as described above can be suppressed.

For example, the balance acquisition unit 53 adds the first economic value to the third economic value and adds the second economic value to the overall third economic value including the first and second periods, and obtains the power generation state of the retrofitted solar power generation device 20. Calculate the economic balance of the power generation system 100 as a whole including the first and second periods. By displaying the economic balance, it is possible to prevent an erroneous display of the overall economic balance including the first and second periods.

Further, for example, the balance acquisition unit 53 adds the first economic value in the first period to the third economic value in the first period, and considers the power generation state of the retrofitted solar power generation device 20, The economic balance of the power generation system 100 as a whole is calculated. By displaying the economic balance, it is possible to prevent the economic balance in the first period from being displayed incorrectly. Note that the balance acquisition unit 53 adds the first economic value in the first period to β×E of the third economic value in the first period, and considers the power generation state of the retrofitted solar power generation device 20, Calculate the power purchase amount for one period. By displaying the power purchase amount, it is possible to prevent an erroneous display of the power purchase amount in the first period.

Also, for example, the balance acquisition unit 53 adds the second economic value in the second period to the third economic value in the second period, and considers the power generation state of the retrofitted solar power generation device 20, The economic balance of the power generation system 100 as a whole is calculated. By displaying the economic balance, it is possible to prevent the economic balance from being displayed incorrectly in the second period. Note that the balance acquisition unit 53 adds the second economic value in the second period to (α×D) of the third economic value in the second period, and considers the power generation state of the retrofitted solar power generation device 20. Calculate the amount of electricity sold in the second period. By displaying the electric power sales amount, it is possible to prevent the electric power sales amount from being displayed incorrectly in the second period.

A more accurate display of the power purchase amount, power sale amount, and economic balance as described above can be used as detection means, communication means, processing means, display means, etc. for grasping the power generation state of the retrofitted solar power generation device 20 at any time. , can be achieved without separately providing in addition to existing various processing means and existing display means. Therefore, even if the existing power generation system 100 is retrofitted with the photovoltaic power generation device 20 , it is possible to easily obtain an economic balance in consideration of the retrofitted photovoltaic power generation device 20 with a simple configuration.

Further, as described above, in the first period, by assuming that all or part of the power amount AkWh corresponding to the power generation amount A is supplied from the retrofitted solar power generation device 20 to the power load device 40, The first economic value in the first period can be easily assumed as shown in (Formula 4) to (Formula 6) above. Similarly, in the second period, by assuming that the power generation amount A of the retrofitted photovoltaic power generation device 20 is reversed, the second economic value in the second period can be easily calculated as shown in (Equation 7) above. can be assumed to be

Note that if the power generation state of the retrofitted photovoltaic power generation device 20 differs from day to day, month to month, or season to season, the balance acquisition unit 53 calculates the economic balance based on the power generation state corresponding to the economic balance calculation date. It is preferable to obtain Moreover, it is preferable that the balance acquisition unit 53 acquires the economic balance in accordance with fluctuations in the selling price of power generated by the already installed fuel cell device 30, fluctuations in the purchase price of grid power, and the like. By acquiring the economic balance according to fluctuations in the power generation state, the power selling price, the power purchasing price, etc., it is possible to improve the accuracy of the economic balance.

[Other embodiments]
The configurations disclosed in the above-described embodiments (including other embodiments, the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments unless there is a contradiction. The embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the scope of the present invention.

(1) In the above-described embodiment, generated power is supplied to the power load device 40 preferentially from the existing power generator over the retrofitted power generator. However, it is also possible to configure the power generation system as follows.

(a) Generated power may be supplied to the power load device 40 preferentially from a retrofitted power generator over an existing power generator.
That is, in the above-described embodiment, the photovoltaic power generation device 20 is installed as a retrofit in the power generation system 100 including the already installed fuel cell device 30 . Then, generated power is supplied to the power load device 40 preferentially from the installed fuel cell device 30 over the retrofitted solar power generation device 20 . However, unlike this, the generated power may be supplied to the power load device 40 preferentially from the retrofitted photovoltaic power generation device 20 over the already installed fuel cell device 30 .

In this case, as in the above embodiment, the power generation system 100 includes an existing power generation device (for example, the fuel cell device 30) that can be interconnected with the power system 10, and a retrofitted power generation device that can be interconnected with the power system 10. It includes a device (for example, a photovoltaic power generation device 20) and a power load device 40 that receives power supply from at least one of the power system 10, an existing power generation device, and a retrofitted power generation device. Descriptions of configurations similar to those of the above embodiment are omitted or simplified.
Here, the power management device 50 includes a power generation information acquisition unit 51 that acquires in advance a predetermined amount of power generated by the retrofitted power generation device, a balance acquisition unit 53 that acquires the economic balance considering the retrofitted power generation device, and the like.

Then, the balance acquisition unit 53 calculates the first economic value in the first period in which the amount of load power required by the power load device 40 is greater than the amount of power generated by the retrofitted power generation device. Also, the balance acquisition unit 53 determines that the amount of load power required by the power load device 40 instead of calculating the first economic value or in addition to the calculation of the first economic value is greater than the amount of power generated by the retrofitted power generation device. A second economic value is calculated for a second period in which is smaller.

Specifically, in the first period in which the relationship of the load power amount > the power generation amount of the retrofitted power generation device is satisfied, the power generation amount of the retrofit power generation device is insufficient with respect to the load power amount. , the first economic value is calculated as follows, depending on the magnitude of the power generated by the existing power generator.

First, when the amount of power shortage is smaller than the amount of power generated by the already installed power generation device, the power shortage is covered by the amount of power generated by the already installed power generation device. No need to buy electricity from In this case, the power purchase price of the system power from the power system 10 is multiplied by the amount of power shortage, and the first multiplication result as a merit can be easily obtained. Furthermore, the surplus after the existing power generation device compensates for the power shortage in the power load device is the amount of reverse flow power energy) is assumed to be reversed. In this case, it is possible to simply obtain the second multiplication result as an advantage by multiplying the power selling price of the power generated by the existing power generation device and the reverse flow power amount. By adding the first multiplication result and the second multiplication result, the first economic value for the first period can be easily obtained.

Secondly, if the amount of power shortage is greater than the amount of power generated by the existing power generation equipment, the power shortage is covered by the amount of power generated by the power generation equipment that is already installed. It is not necessary to buy power from the power system 10 for the amount of power generated by the power generator. In this case, the first economic value as a merit can be easily obtained by multiplying the power purchase price of the system power from the power system 10 by the amount of power generated by the existing power generator.

On the other hand, in the second period where the relationship of load power < power generated by the retrofitted power generator, the amount of power generated in the reverse flow to the power system 10 increases by the amount of power generated by the existing power generator. . The second economic value based on the already installed power generation equipment in the second period can be easily obtained by multiplying the selling price of the power generated by the already installed power generation equipment in the second period by the generated power amount. can. The secondary economic value is generally evaluated as the economic value of merit.

According to the above configuration, even when the power generation device is retrofitted to the power generation system, it is possible to acquire the economic balance in consideration of the retrofitting of the power generation device. Therefore, in addition to existing various processing means and existing display means already installed in the power generation system, detection means for detecting the power generation state of the retrofitted power generation device at any time, communication means for collecting the detected power generation state, There is no need to separately provide a processing means for calculating the economic balance of the entire power generation system by combining the power generated by the retrofitted power generation device and the power generated by the existing fuel cell device, and the display means for displaying the economic balance. Economic balance can be obtained easily with a simple configuration.

In the above description, the fuel cell device 30 is taken as an example of the already installed power generation device, and the solar power generation device 20 is taken as an example of the retrofitted power generation device. However, as described in (b) below, the existing power generation device may be, for example, the solar power generation device 20, and the retrofitted power generation device may be, for example, the fuel cell device 30. good. In this case, generated power may be supplied to the power load device 40 preferentially from the retrofitted fuel cell device 30 rather than the already installed photovoltaic power generation device 20 .

(b) Furthermore, in the above embodiment, the photovoltaic power generation device 20 is installed as a retrofit in the power generation system 100 including the already installed fuel cell device 30 . However, in the power generation system 100 including the already installed photovoltaic power generation device 20, the fuel cell device 30 may be installed as a retrofit. In this case, as described above, generated power is supplied to the power load device 40 preferentially from the retrofitted fuel cell device 30 to the existing solar power generation device 20 . Note that the generated power may be supplied to the power load device 40 preferentially from the existing photovoltaic power generation device 20 over the retrofitted fuel cell device 30 .
(c) In the above embodiment, the fuel cell device 30 and the solar power generation device 20 are used as the power generation device, but the power generation device includes a wind power generation device other than the fuel cell device and the solar power generation device. can also

(2) The third economic value may be calculated by a method different from that of the above embodiment. For example, although not limited to this, the third economic value can be calculated as follows.
First, the balance acquisition unit 53 acquires various types of information when calculating the third economic value. For example, the balance acquisition unit 53 acquires the power amount in the power meter CT1 from the power meter CT1. In addition, the balance acquisition unit 53 acquires the power selling price of the power generated by the already installed fuel cell device 30 from the power selling price acquiring unit 55, and acquires the power purchasing price of the grid power from the power buying price acquiring unit 57. do.

Here, when the load power amount of the power load device 40 and the generated power amount of the installed fuel cell device 30 are equal, the power amount acquired by the power meter CT1 becomes zero. Therefore, the balance acquisition unit 53 calculates the third economic value as zero (third economic value=0).

Further, when the load power amount of the power load device 40 is larger than the generated power amount of the existing fuel cell device 30, that is, when power shortage occurs, the power amount acquired by the power measuring device CT1 becomes, for example, a positive value. . Therefore, when the power generation state of the retrofitted photovoltaic power generation device 20 is not taken into consideration, the power meter CT1 measures the power shortage as the system power amount purchased from the power system 10 (purchased power amount). Become.
In this case, the balance acquisition unit 53 calculates the third economic value based on the multiplication of the power purchase price of the system power from the power system 10 and the power purchase amount.
Here, if the power purchase price of grid power is β yen/kWh and the power purchase amount is E, the third economic value is shown by (Equation 8).
Third economic value = β x E (Formula 8)

When the amount of load power of the power load device 40 is smaller than the amount of power generated by the existing fuel cell device 30, that is, when there is surplus power, the amount of power acquired by the power meter CT1 is, for example, a negative value. . Therefore, when the power generation state of the retrofitted photovoltaic power generation device 20 is not taken into consideration, the power meter CT1 uses the surplus power as the reverse flow power amount (sold power amount) from the already installed fuel cell device 30 to the power system 10. You are measuring.
In this case, the balance acquisition unit 53 calculates the third economic value based on the multiplication of the selling price of the power generated by the already installed fuel cell device 30 and the amount of selling power.
Here, if the selling price of the power generated by the fuel cell device 30 is α yen/kWh and the amount of selling power is D, the third economic value is given by (Equation 9).
Third economic value=α×D (Formula 9)

Note that the balance acquisition unit 53 may calculate the third economic value for the entire first period and the second period based on the above (formula 8) and (formula 9). The third economic value may be calculated every two periods. However, the period for calculating the third economic value is not limited to this.

(3) In the above embodiment, the power management device 50 is incorporated in the fuel cell device 30, which is an already installed power generation device. However, the power management device 50 only needs to be incorporated in the power generation system 100, and may be provided separately from the fuel cell device 30, which is the already installed power generation device.

10: Power system 20: Retrofitted photovoltaic power generation device (retrofitted power generation device)
30: Existing fuel cell device (existing power generation device)
40: Power load device 50: Power management device 53: Balance acquisition unit 58: Display unit 100: Power generation system

Claims (4)

An existing power generation device that can be interconnected with a power system via a power line, a retrofitted power generation device that can be interconnected with the power system via the power line, the power system, the existing power generation device, and A power management device that manages power in a power generation system including a power load device that receives power supply from at least one of the retrofitted power generation devices via the power line,
The power line is connected to the power system, the retrofitted power generation device, the existing power generation device and the power load device in this order from the upstream side,
A power measuring instrument is provided between a connection point of the retrofitted power generation device and a connection point of the existing power generation device on the power line,
a power generation information acquisition unit that acquires in advance a predetermined power generation amount of the retrofitted power generation device;
a balance acquisition unit that acquires the economic balance considering the retrofitted power generation device,
The income and expenditure acquisition unit
calculating a first economic value in a first period in which the amount of load power required by the power load device is greater than the amount of power generated by the existing power generation device;
In a second period in which the amount of load power required by the power load device is smaller than the amount of power generated by the existing power generation device, the selling price of the power generated by the retrofitted power generation device and the Calculation of the second economic value by multiplication with the amount of power generated by the power generation device;
and
In calculating the first economic value in the first period,
If the amount of power generated by the existing power generation device is insufficient with respect to the amount of load power and the amount of power shortage is smaller than the amount of power generated by the retrofitted power generation device, purchase of system power from the power system A first multiplication result obtained by multiplying the electricity price and the power shortage amount is obtained, and the power shortage amount is subtracted from the power generation amount of the retrofitted power generation device to obtain the reverse power power amount reversed to the power system. calculating, multiplying the power selling price of the power generated by the retrofitted power generation device and the reverse flow power amount to obtain a second multiplication result, and adding the first multiplication result and the second multiplication result Alternatively , if the amount of power shortage is greater than the amount of power generated by the retrofitted power generation device, the power purchase price of the system power from the power system and the retrofitted power Calculate the first economic value by multiplying the amount of power generated by the power generation device,
As the third economic value in the first period, from the result of multiplication of the purchase price of grid power from the power grid and the amount of power generated by the existing power generation device in the first period, calculating a value obtained by subtracting the multiplication result of the power purchase price of grid power and the amount of power supplied from the power grid side through the power line at the portion where the power meter is installed,
As the third economic value in the second period, the selling price of the power generated by the existing power generation device and the power line at the part where the power measuring instrument is installed in the second period. A value obtained by multiplying the surplus power amount to be supplied by the power purchase price of the system power from the power system and the power amount supplied to the power load device from the existing power generation device is added. Calculate the value obtained by
When calculating the economic balance in the first period, the value obtained by adding the calculated first economic value in the first period to the calculated third economic value in the first period is income and expenditure,
When calculating the economic balance in the second period, the value obtained by adding the calculated second economic value in the second period to the calculated third economic value in the second period is Balance, power management device. The already installed power generation device is a first fuel cell device,
2. The power management device according to claim 1 , wherein said retrofitted power generation device is at least one power generation device including a second fuel cell device other than said first fuel cell device and a solar power generation device. 3. The power management device according to claim 1 , further comprising a display unit for controlling display of said economic balance. An existing power generation device that can be interconnected with a power system via a power line, a retrofitted power generation device that can be interconnected with the power system via the power line, the power system, the existing power generation device, and A power management method for managing power in a power generation system including a power load device that receives power supply from at least one of the retrofitted power generation devices via the power line,
The power line is connected to the power system, the retrofitted power generation device, the existing power generation device and the power load device in this order from the upstream side,
A power measuring instrument is provided between a connection point of the retrofitted power generation device and a connection point of the existing power generation device on the power line,
a power generation information acquisition step of acquiring in advance the amount of power generated by the retrofitted power generation device;
a balance acquisition step of acquiring an economic balance based on the retrofitted power generation device;
In the income and expenditure acquisition step,
calculating a first economic value in a first period in which the amount of load power required by the power load device is greater than the amount of power generated by the existing power generation device;
In a second period in which the amount of load power required by the power load device is smaller than the amount of power generated by the existing power generation device, the selling price of the power generated by the retrofitted power generation device and the Calculation of the second economic value by multiplication with the amount of power generated by the power generation device;
and
In calculating the first economic value in the first period,
If the amount of power generated by the existing power generation device is insufficient with respect to the amount of load power and the amount of power shortage is smaller than the amount of power generated by the retrofitted power generation device, purchase of system power from the power system A first multiplication result obtained by multiplying the electricity price and the power shortage amount is obtained, and the power shortage amount is subtracted from the power generation amount of the retrofitted power generation device to obtain the reverse power power amount reversed to the power system. calculating, multiplying the power selling price of the power generated by the retrofitted power generation device and the reverse flow power amount to obtain a second multiplication result, and adding the first multiplication result and the second multiplication result Alternatively , if the amount of power shortage is greater than the amount of power generated by the retrofitted power generation device, the power purchase price of the system power from the power system and the retrofitted power Calculate the first economic value by multiplying the amount of power generated by the power generation device ,
As the third economic value in the first period, from the result of multiplication of the purchase price of grid power from the power grid and the amount of power generated by the existing power generation device in the first period, calculating a value obtained by subtracting the multiplication result of the power purchase price of grid power and the amount of power supplied from the power grid side through the power line at the portion where the power meter is installed,
As the third economic value in the second period, the selling price of the power generated by the existing power generation device and the power line at the part where the power measuring instrument is installed in the second period. A value obtained by multiplying the surplus power amount to be supplied by the power purchase price of the system power from the power system and the power amount supplied to the power load device from the existing power generation device is added. Calculate the value obtained by
When calculating the economic balance in the first period, the value obtained by adding the calculated first economic value in the first period to the calculated third economic value in the first period is income and expenditure,
When calculating the economic balance in the second period, the value obtained by adding the calculated second economic value in the second period to the calculated third economic value in the second period is Balance and power management methods.

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