JP7660488B2 - Power control systems and power control equipment - Google Patents

Description

This disclosure relates to a power control system and a power control device.

Conventionally, self-consignment is known as a mechanism for transmitting power output from a power generation facility to a demand facility via a power grid managed by a third-party entity. In a system that performs self-consignment, technology has been proposed for appropriately grasping the amount of self-consignment power (see, for example, Patent Document 1).

When solar power generation is performed, for example, when the amount of power generation is high or when the demand for electricity is low, it is necessary to suppress the power generation output so that the power supplied to the power grid does not exceed the amount that the electric power company can connect (output control). In addition, when the demand for electricity is high, output control may be necessary to prevent the power lines from overheating due to the addition of solar power generation. When an instruction regarding power (power instruction) is issued by the electric power company, the power generation equipment is required to control the power output so as to satisfy the power instruction. In output control, a technology has been proposed in which the value of the power instruction is calculated based on the output control instruction value and the abnormality detection result, and the value is sent to the power conditioner (see, for example, Patent Document 2).

JP 2021-52557 A JP2017-229213Publication

In a system like the one described above, it is desirable to effectively realize self-transfer of generated electricity while satisfying the power directives of electric power companies.

The objective of this disclosure is to provide a power control system and power control device that can realize self-transmission of generated power while satisfying power directives from electric power companies.

A power control system according to an embodiment includes:
A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls the power output by the power generation unit so as to satisfy a power command from an electric power utility and reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the first base to the power grid based on the power demand;
Equipped with.

Moreover, the power control system according to one embodiment includes:
A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls at least one of charging and discharging of the storage battery at the first base so as to satisfy a power command from an electric utility company and reduce a difference between a planned amount of power flowing back from the first base to the power grid and an actual amount of power flowing back based on the power demand;
Equipped with.

Moreover, the power control device according to one embodiment includes:
A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls the power output by the power generation unit so as to satisfy a power command from an electric power utility and reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the first base to the power grid based on the power demand;
Equipped with.

Moreover, the power control device according to one embodiment includes:
A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls at least one of charging and discharging of the storage battery at the first base so as to satisfy a power command from an electric utility company and reduce a difference between a planned amount of power flowing back from the first base to the power grid and an actual amount of power flowing back based on the power demand;
Equipped with.

According to one embodiment, it is possible to provide a power control system and power control equipment that can realize self-transmission of generated power while satisfying power instructions from electric power companies.

1 is a diagram illustrating an example of the configuration of a power control system according to an embodiment; 4 is a flowchart illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment. FIG. 2 is a diagram illustrating the operation of a power control system according to an embodiment.

In the present disclosure, the power control system and/or power control device may be a system and/or device that operates using power. The power control system and/or power control device may include a function for controlling power. The function of the power control system and/or power control device is not limited to the function for controlling power, and may include other functions.

In addition, in this disclosure, "self-dispatch" may be defined as, for example, the "Guidelines for Self-Dispatch" (enforced on April 1, 2014) established by the Agency for Natural Resources and Energy, an external bureau of the Ministry of Economy, Trade and Industry. In other words, self-dispatch may refer to the electricity transmission service provided by a general electric utility when a person who installs a private power generation facility transmits electricity generated using the private power generation facility to a factory or the like located in a different location of the person who installs the private power generation facility via a transmission and distribution network maintained and operated by the general electric utility.

The power control system according to one embodiment will be described below with reference to the drawings.

Figure 1 is a diagram showing an example of the configuration of a power control system according to one embodiment. As shown in Figure 1, in one embodiment, power control system 1A may be a system installed at a first location, and power control system 1B may be a system installed at a second location. Hereinafter, when there is no particular distinction between power control system 1A and power control system 1B, they will be collectively referred to simply as "power control system 1."

In FIG. 1, the first base is the base shown in the region above the dashed line shown at the top of FIG. 1, and the second base is the base shown in the region below the dashed line shown at the bottom of FIG. 1. The first base and/or the second base may be any location where electricity is expected to be generated and/or consumed, such as a location where so-called ground-mounted solar power generation is performed, a business office or sales office of each business operator, a factory, and an apartment building. In addition, in FIG. 1, the area between the first base and the second base may be, for example, a base other than the first base or the second base, may be part of the first base and/or the second base, or may be any base.

In FIG. 1, paths for transmitting and/or receiving electricity, i.e., paths for power, are primarily shown by solid lines. On the other hand, in FIG. 1, paths for transmitting and/or receiving information, i.e., paths for electrical signals, are primarily shown by dashed lines.

Furthermore, the functional units shown in FIG. 1 may be connected to each other by at least one of wired and wireless connections as appropriate. In FIG. 1, communication interfaces and various repeaters (repeaters) that connect the functional units to each other by at least one of wired and wireless connections are omitted from the illustration. Furthermore, each functional unit may be provided with a storage unit, such as a semiconductor memory, for storing various information and/or programs, as appropriate. In FIG. 1, storage units such as semiconductor memories are omitted from the illustration.

As shown in FIG. 1, the power control system 1A at the first base may include a power generation unit 10A, a power adjustment unit 20A, a load 30A, a smart meter 40A, a demand calculation unit 50A, a simultaneous balancing calculation unit 60A, and an output control unit 70A. The power control system 1A may not include some of the functional units described above, or may include other functional units in addition to the functional units described above.

Also, as shown in FIG. 1, the power control system 1B at the second base may be configured to include a power generation unit 10B, a power adjustment unit 20B, a load 30B, a smart meter 40B, a demand calculation unit 50B, a simultaneous balancing calculation unit 60B, and an output control unit 70B. The power control system 1B may not include some of the functional units described above, or may include other functional units in addition to the functional units described above.

Hereinafter, when there is no particular distinction between power generation unit 10A and power generation unit 10B, they will simply be referred to as "power generation unit 10." Similarly, for other functional units, when there is no particular distinction between a functional unit of power control system 1A and a functional unit of power control system 1B, they will simply be referred to by the reference number of the functional unit (i.e., the symbol A or B will be omitted). For example, when there is no particular distinction between power adjustment unit 20A and power adjustment unit 20B, they will simply be referred to as "power adjustment unit 20."

Each functional unit of power control system 1B corresponding to a functional unit of power control system 1A may have the same or similar configuration as the functional unit of power control system 1A, or may have a different configuration. In the following, for the sake of simplicity, each functional unit of power control system 1B corresponding to a functional unit of power control system 1A will be described as being the same as the functional unit of power control system 1A.

Unless otherwise specified, the following basically describes power control system 1A in more detail. However, a description based on the same or similar concept as power control system 1A may also be applicable to power control system 1B.

The power generation unit 10 may be a functional unit that generates power such as solar power generation by including, for example, a solar cell. The power generation unit 10 may be capable of outputting the generated power to the outside. The power generation unit 10 may appropriately include a power conditioner (hereinafter also referred to as PCS (Power Conditioning Subsystem)) that controls the power generated by the power generation unit 10 and output to the outside. Hereinafter, the power generation unit 10 will be described as performing solar power generation. However, in one embodiment, the power generation performed by the power generation unit 10 is not limited to solar power generation. For example, the power generation unit 10 may perform wind power generation, hydroelectric power generation, thermal power generation, power generation by a fuel cell, or power generation by a plug-in hybrid vehicle. In one embodiment, the power generation unit 10 may generate power that can be reverse-flowed to the power grid. The power generation unit 10 can be configured using various known technologies. Therefore, a more detailed description of the power generation unit 10 will be omitted.

The power generated by the power generation unit 10 may be supplied to the smart meter 40 (through a PCS provided in the power generation unit 10). For this reason, as shown in FIG. 1, the power generation unit 10 may be connected to the smart meter 40 by a power line. The power supplied from the power generation unit 10 to the smart meter 40 may be reverse-flowed to the power grid. The reverse-flowed power may be used as self-consignment power. The power supplied from the power generation unit 10 to the smart meter 40 may be purchased by the power grid as surplus imbalance power. The power generation unit 10 may control the power output based on an output control value (e.g., %) transmitted from the output control unit 70. Information on the power generated by the power generation unit 10 (such as the amount of power output) may be transmitted to the demand calculation unit 50.

The power adjustment unit 20A may have a function of adjusting the power at the first base. The power adjustment unit 20B may have a function of adjusting the power at the second base. The power adjustment unit 20 may have at least one of a function of enabling power to be output to the outside and a function of enabling power to be input from the outside. Specifically, the power adjustment unit 20 may have, for example, a storage battery. The power adjustment unit 20 may appropriately include a PCS that controls at least one of the power output by the power adjustment unit 20 and the power input to the power adjustment unit 20. That is, in this case, the PCS of the power adjustment unit 20 may control at least one of the power discharged by the storage battery of the power adjustment unit 20 and the power charged to the storage battery. The power control system 1 can obtain the adjustment power to achieve the simultaneous equal amount of the planned value described later by the power charged and discharged by the power adjustment unit 20.

The power adjustment unit 20 may include, for example, a stationary storage battery, or may include, for example, a storage battery (battery) for an electric vehicle such as an EV or a plug-in hybrid vehicle. The power adjustment unit 20 can be configured using various known technologies. Therefore, a detailed description of the power adjustment unit 20 is omitted.

The power discharged by the power adjustment unit 20 may be supplied to the smart meter 40 (via a PCS provided in the power adjustment unit 20). The power adjustment unit 20 may also charge the power supplied from the power generation unit 10 (via a PCS provided in the power adjustment unit 20). For this reason, as shown in FIG. 1, the power adjustment unit 20 may be connected to the smart meter 40 by a power line. The power adjustment unit 20 may control the power to be charged and discharged based on an adjustment value (e.g., %) transmitted from the output control unit 70. The power adjustment unit 20 may also be controlled so as not to be able to charge the power supplied from the power grid.

The power adjustment unit 20 may charge at least a portion of the power generated by the power generation unit 10.

The load 30A may be any type of device that consumes power at the first location. The load 30B may be any type of device that consumes power at the second location. The load 30 may be any type of electronic device.

The load 30 may consume at least a portion of the power generated by the power generation unit 10. The load 30 may also consume at least a portion of the power discharged by the power adjustment unit 20. The load 30 may also consume at least a portion of the power purchased from the grid power. As shown in FIG. 1, the load 30 may be connected to the power generation unit 10, the power adjustment unit 20, and the smart meter 40 by power lines.

The smart meter 40 may be a functional unit that digitally measures power information and has a function of communicating the measured information. Here, the power information may be, for example, the amount of power purchased, the amount of power flowing backward, and/or information related to power such as time. As shown in FIG. 1, the smart meter 40 may be connected to the power generation unit 10, the power adjustment unit 20, and the load 30 by power lines. The smart meter 40 may be configured using various known technologies. Therefore, a detailed description of the smart meter 40 will be omitted.

As shown in FIG. 1, the smart meter 40A at the first base and the smart meter 40B at the second base may be connected by a power line (power system). In this way, by connecting the smart meters 40 to each other by a power line, it is possible to perform self-consignment of power from one base to the other base. In FIG. 1, the power generated by the power generation unit 10A at the first base may be self-consignment to the load 30B at the second base. Also, in FIG. 1, the power generated by the power generation unit 10B at the second base may be self-consignment to the load 30A at the first base. When realizing bidirectional self-consignment in this way, a functional unit (hereinafter referred to as a "judgment unit") that judges the direction of self-consignment may be provided. Such a judgment unit may be provided at the first base as part of the power control system 1A, at the second base as part of the power control system 1B, or at a location different from the first base or the second base.

The smart meter 40A may be communicatively connected to the demand calculation unit 50 and the output control unit 70. The smart meter 40A may transmit information (e.g., the amount of power) of the power purchased and/or reverse flow at the first base to the demand calculation unit 50. The smart meter 40 may also transmit information (e.g., the amount of power) of the power generated by the power generation unit 10 that is reverse flow to the output control unit 70. The smart meter 40 may also transmit information (e.g., the amount of power) of the power generated by the power generation unit 10 that is self-consignment as reverse flow to the output control unit 70.

The demand calculation unit 50, the simultaneous and equal amount calculation unit 60, and the output control unit 70 may each be a controller that controls the operation of the power control system 1. The controller may include at least one processor, such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), to provide control and processing power for executing various functions. The controller may be realized with one processor or multiple processors. The controller may be realized as a single integrated circuit. The processor may be realized as multiple integrated circuits and discrete circuits connected to each other so that they can communicate with each other. The controller may be configured as a CPU or DSP, and software such as a program executed by the CPU or DSP. The program executed in the controller and the results of the processing executed in the controller may each be stored in an arbitrary storage unit.

The demand calculation unit 50, the simultaneous equivalent calculation unit 60, and the output control unit 70 may each be separate functional units, or may be functional units with at least some of them merged together, or may be functional units with all of them merged together. The demand calculation unit 50, the simultaneous equivalent calculation unit 60, and the output control unit 70 may each be configured as hardware resources, or may be configured as software, or may be constructed by software and hardware resources working together. The functions of the demand calculation unit 50, the simultaneous equivalent calculation unit 60, and the output control unit 70 will be described further below.

The power server 200 may be a server that distributes various information of an electric utility such as a power company. In one embodiment, the power server 200 may transmit a command (power command) regarding power to each base such as the first base and/or the second base. Here, the power command may be a command that requests control (e.g., suppression) of the output of power generated when the balance between the demand and supply of power in the power system is lost. In addition, such a power command may be acquired from the power server 200 by, for example, any device in the power control system 1. The power server 200 may transmit a power command to, for example, the simultaneous equal amount calculation unit 60 and/or the output control unit 70 of the power control system 1. In addition, the power server 200 may transmit a power command to the simultaneous equal amount calculation unit 60 via the output control unit 70. In addition, the simultaneous equal amount calculation unit 60 and/or the output control unit 70 of the power control system 1 may acquire a power command from the power server 200. For this reason, the power server 200 may be communicatively connected to the simultaneous power balance calculation unit 60 and/or the output control unit 70 of the power control system 1.

In one embodiment, the power server 200 may transmit a power command including a value of the power generation suppression amount (e.g., a percentage) to the power generation power balance calculation unit 60 and/or the output control unit 70. In one embodiment, the power server 200 may transmit a power command for a given day up to the day before the given day, or on the day of the given day.

The power server 200 may be, for example, a server (computer) used in a typical client-server system. A computer used as a server can be configured using various known technologies. Therefore, a detailed description of the computer used as a server is omitted.

The cross-regional organization server 300 may be an electronic device such as a server (computer) operated and/or used by an organization such as the Organization for Cross-regional Coordination of Transmission Operators, JAPAN (OCCTO). The Organization for Cross-regional Coordination of Transmission Operators, JAPAN is an organization established under the Electricity Business Act (Act No. 170 of July 11, 1964) with the aim of promoting the cross-regional operation of the electric power business in Japan. All electric power companies in Japan are required to become members of the organization. The organization monitors the electricity supply and demand situation of each member company and instructs other members to lend electricity to members whose supply and demand situation has deteriorated. The cross-regional organization server 300 may be, for example, a server (computer) used in a typical client-server system.

In one embodiment, the power control system of each base, such as the power control system 1A of the first base and/or the power control system 1B of the second base, may prepare (generate) a power generation plan for each base and transmit the power generation plan to the wide-area organization server 300. Here, the "power generation plan" may be, for example, a planned value of the amount of power for each predetermined time interval to be transmitted from a power generation facility (e.g., the first base) to a demand facility (e.g., the second base). For example, in one embodiment, the simultaneous balancing calculation unit 60 of the power control system 1 may be communicatively connected to the wide-area organization server 300. In one embodiment, the simultaneous balancing calculation unit 60 of the power control system 1 may transmit the prepared power generation plan of the power control system 1 to the wide-area organization server 300.
For example, in one embodiment, the simultaneous power calculation unit 60 of the power control system 1 may transmit the power generation plan for a specific day of the power control system 1 to the wide-area agency server 300 by the day before the specific day (for example, by noon on the day before the specific day).

The weather server 400 may be a server that distributes various weather information (weather data), etc. The weather server 400 may be a server operated by an administrative agency such as the Japan Meteorological Agency, or may be a server operated by a private information provider. In one embodiment, the weather server 400 may distribute various weather information (weather data) to the power control systems of each base, such as the power control system 1A of the first base and/or the power control system 1B of the second base. In addition, the various weather information (weather data) may be acquired from the weather server 400 by any device in the power control system 1, for example. The various weather information (weather data) may include at least one of the following at a specified time or in a specified time period at a specified location: weather, temperature, humidity, sunshine hours, solar radiation, cloud cover, precipitation, and/or snowfall.

In one embodiment, the demand calculation unit 50 and the simultaneous equal amount calculation unit 60 of the power control system 1 may be communicatively connected to a weather server 400. In one embodiment, the weather server 400 may transmit various weather information to the demand calculation unit 50 and/or the simultaneous equal amount calculation unit 60 of the power control system 1. The weather server 400 may be, for example, a server (computer) used in a typical client-server system.

In one embodiment, the weather server 400 may not only distribute various actual weather data, but may also distribute, for example, forecasts of various weather data. Also, in one embodiment, the weather server 400 may distribute, as forecasts of various weather data, various forecasts, such as forecast data for a certain time before, such as a forecast for the previous day or a forecast for several hours before, forecast data for the current day, and forecast data for a certain time after, such as a future forecast.

Next, we will provide a more detailed explanation of the demand calculation unit 50, the simultaneous and equal amount calculation unit 60, and the output control unit 70, which perform characteristic functions in the power control system 1 according to one embodiment.

The demand calculation unit 50 calculates the demand for electricity in the power control system 1. In one embodiment, the demand calculation unit 50A calculates the demand for electricity in the power control system 1A, for example, the demand for electricity to be supplied to the load 30A. In one embodiment, the demand calculation unit 50 may calculate not only the actual electricity demand (actual value of electricity demand) in the power control system 1, but also a predicted value of electricity in the power control system 1.

In one embodiment, the demand calculation unit 50 may calculate the actual value of the power demand based on the information transmitted from the power generation unit 10, the information transmitted from the power adjustment unit 20, and the information transmitted from the smart meter 40. In this case, the information transmitted from the power generation unit 10 may be data such as the amount of power actually output by the power generation of the power generation unit 10. The information transmitted from the power generation unit 10 may be transmitted, for example, from the PCS of the power generation unit 10. Furthermore, the information transmitted from the power adjustment unit 20 may be data such as the amount of power actually charged and discharged by the charging and discharging of the power adjustment unit 20. The information transmitted from the power adjustment unit 20 may be transmitted, for example, from the PCS of the power adjustment unit 20. Furthermore, the information transmitted from the smart meter 40 may be data on the power actually flowing backward and/or purchased in the power control system 1 of each base.

In one embodiment, the demand calculation unit 50 may calculate the actual value of the power demand, for example, based on the following formula (1).
(Power demand)=(output power of power generation unit 10)+(charge/discharge power of power adjustment unit 20)−(power sold)+(power purchased) (1)
In formula (1), the charging and discharging power of the power adjustment unit 20 is positive for discharging and negative for charging. The actual value of the power demand calculated in this manner may be stored in any storage unit, such as a storage unit included in the demand calculation unit 50.

In one embodiment, the demand calculation unit 50 may receive weather data, such as temperature and/or humidity, from the weather server 400 as described above. The demand calculation unit 50 may store the weather data received, for example, from the weather server 400 in any storage unit, such as a storage unit provided in the demand calculation unit 50.

In one embodiment, the demand calculation unit 50 may calculate a predicted value of power demand based on, for example, the weather data described above. In this case, the demand calculation unit 50 may calculate the predicted value of power demand by, for example, modeling the relationship between the past actual values of power demand stored in the storage unit and the weather data, and using multiple regression analysis or the like. In addition, in one embodiment, the demand calculation unit 50 may calculate various types of power demand predictions, such as prediction data for a certain time ago, such as a prediction for the previous day or a prediction for several hours ago, and prediction data for the current day, as the predicted value of power demand. The predicted value of power demand calculated by the demand calculation unit 50 in this manner may be supplied to the simultaneous equivalent calculation unit 60.

In this way, in one embodiment, the demand calculation unit 50A may calculate the electricity demand of the first location.

The simultaneous balancing calculation unit 60 generates a power generation plan that satisfies the simultaneous balancing amount. Here, the simultaneous balancing amount may be defined as the power generation plan and the actual power generation being the same amount at the same time, assuming that the demand (purchased power) of the self-consignment destination's power is greater than the reverse flow of the self-consignment source's power. In one embodiment, the simultaneous balancing calculation unit 60 may calculate a predicted value of reverse flow power based on a predicted value of power demand supplied from the demand calculation unit 50.

As described above, the simultaneous balancing calculation unit 60 may receive a predicted value of power demand from the demand calculation unit 50. The simultaneous balancing calculation unit 60 may receive various types of power demand predictions as the predicted value of power demand, such as prediction data for a certain time ago, such as a prediction for the previous day or a prediction for several hours ago, and prediction data for the current day.

The simultaneous and synchronous calculation unit 60 may also receive weather data including, for example, solar radiation from the weather server 400. In particular, the simultaneous and synchronous calculation unit 60 may receive predictions of various weather data from the weather server 400. As described above, the simultaneous and synchronous calculation unit 60 may receive various predictions from the weather server 400, such as prediction data for a predetermined time ago, such as a prediction for the previous day or a prediction for several hours ago, prediction data for the current day, and prediction data for a predetermined time later, such as a future prediction.

In one embodiment, the power generation balancing calculation unit 60 may calculate a prediction of the amount of power generated by the power generation unit 10 based on weather data received from the weather server 400. In this case, the power generation balancing calculation unit 60 may calculate a prediction of the amount of power generated by the power generation unit 10 based on, for example, the following formula (2).
(Power generation amount of the power generation unit 10)=(Solar radiation amount)×(Coefficient) (2)
Here, in the "Method for estimating the amount of power generated by a photovoltaic power generation system" (JIS C8907:2005) according to the Japanese Industrial Standards (JIS), an equation is prescribed for estimating the amount of power generated by a photovoltaic power generation system from various parameters. In one embodiment, the equation may be used. Since these are prescribed in JIS C8907:2005, a detailed description is omitted.

In one embodiment, the simultaneous power balancing calculation unit 60 may calculate the reverse flow power at the base where the power control system 1 is installed, for example, based on the following formula (3). Here, reverse flow power occurs when the generated power is greater than the power demand. Therefore, the reverse flow power may be calculated based on formula (3) for example, when the generated power is greater than the demand power.
(Reverse flow power)=(power generation by power generation unit 10)−(power demand) (3)
The power generation balancing calculation unit 60 may generate a power generation plan for the base based on this calculation result. For example, the calculation result may be generated as is as the power generation plan, or a value obtained by multiplying the calculation result by a certain coefficient may be generated as the power generation plan. In one embodiment, the power generation balancing calculation unit 60 may transmit the power generation plan for the reverse flow power generated in this manner to, for example, the output control unit 70 and/or the wide-area organization server 300. In one embodiment, the power generation balancing calculation unit 60 may transmit, for example, power generation a predetermined time ago, such as a power generation plan for the previous day or a power generation plan for several hours ago, and a power generation plan for the current day, to the output control unit 70 as the generated power generation plan for the reverse flow power.

Furthermore, in one embodiment, the simultaneous balancing calculation unit 60 may receive a power command transmitted from the power server 200. In one embodiment, the simultaneous balancing calculation unit 60 may receive a power command including a value of the power generation suppression amount (for example, a percentage) from the power server 200. Also, in one embodiment, the simultaneous balancing calculation unit 60 may receive a power command transmitted by the day before the specified day as a power command transmitted from the power server 200, or may receive a power command transmitted on the specified day. In this case, the simultaneous balancing calculation unit 60 may transmit to the output control unit 70 a power generation plan for reverse flow power generated after taking into account the power command transmitted from the power server 200.

In this way, the simultaneous power generation balancing calculation unit 60 may generate a power generation plan for the base based on inputs such as the power demand and solar radiation at the base. The power generation plan generated in this way may be stored in any storage unit such as a storage unit provided in the simultaneous power generation balancing calculation unit 60. The simultaneous power generation balancing calculation unit 60 may also submit (transmit) the power generation plan generated in this way to the wide-area agency server 300. The simultaneous power generation balancing calculation unit 60 may also transmit the power generation plan generated as described above to the output control unit 70.

As described above, the simultaneous power balancing calculation unit 60 may calculate the predicted value of reverse flow power based on the predicted value of power demand supplied from the demand calculation unit 50. In this case, the simultaneous power balancing calculation unit 60 may register a power generation plan that rationally predicts power generation in advance in the wide-area organization server 300 and/or the output control unit 70. The simultaneous power balancing calculation unit 60 may then match the power generation plan with the actual power generation on the day in 30-minute increments (30-minute time intervals), for example (simultaneous power balancing). Here, the power generation plan may be the amount of power to be reverse flowed to the power grid.

In one embodiment, the power generation amount calculation unit 60 may calculate the amount of power in the power generation plan based on, for example, the following formula (4).
(Power generation plan power amount)=(output power amount of the power generation unit 10)−(power consumption amount of the load 30) (4)
That is, the amount of power in the power generation plan can be calculated as (the amount of power generated by the power generation unit 10 (the amount of power output from the PCS)) - (the amount of power consumed by the site itself).
Here, the amount of power consumed at the site can be calculated from the amount of power generated by the power generation unit 10 (the amount of power generated from the PCS) and the power demand at the site. The amount of power generated by the power generation unit 10 (the amount of power generated from the PCS) can be calculated from data such as the amount of solar radiation.

In this way, in one embodiment, for example, the simultaneous power balance calculation unit 60A may calculate the amount of power to be reverse-flowed from the first location to the power grid in a specified time interval based on the power demand of the first location and the amount of power generated by the power generation unit 10A of the first location.

The output control unit 70 controls the output of power generated by the power generation unit 10. In this case, the output control unit 70 may control the output of power output from the power generation unit 10, for example, by controlling a PCS provided in the power generation unit 10. The output control unit 70 may also control the power input to the power adjustment unit 20 and/or the power output from the power adjustment unit 20. In this case, too, the output control unit 70 may control the power discharged by the power adjustment unit 20 and/or the power charged to the power adjustment unit 20, for example, by controlling a PCS provided in the power adjustment unit 20.

In one embodiment, the output control unit 70 may control the output of power generated by the power generation unit 10 based on the power generation plan received from the simultaneous power balancing calculation unit 60 and/or the power command received from the power server 200. The output control unit 70 may also control the power input to the power adjustment unit 20 and/or the power output from the power adjustment unit 20 based on the power generation plan received from the simultaneous power balancing calculation unit 60 and/or the power command received from the power server 200.

In this case, the output control unit 70 may receive a power generation plan for reverse flow power transmitted from the simultaneous power balance calculation unit 60. Here, the power generation plan that the output control unit 70 receives from the simultaneous power balance calculation unit 60 may be, for example, a power generation plan for the previous day or a power generation plan for a certain time ago, such as a power generation plan for several hours ago, and a power generation plan for the current day.

The output control unit 70 may also receive a power command transmitted from the power server 200. In one embodiment, the output control unit 70 may receive a power command from the power server 200 that includes a value of the amount of suppression of power generation (e.g., a percentage). In one embodiment, the output control unit 70 may also receive a power command transmitted by the power server 200 up to the day before a specific day, or may receive a power command transmitted on the day of the specific day.

Furthermore, in one embodiment, the output control unit 70 may receive information on power transmitted from the smart meter 40. Here, the information on power transmitted from the smart meter 40 may be information on power (e.g., the amount of power) that flows backward among the power generated by the power generation unit 10. Also, the information on power transmitted from the smart meter 40 may be information on power (e.g., the amount of power) that flows backward among the power generated by the power generation unit 10 and that is self-consigned.

The output control unit 70 may control the output of power output from the power generation unit 10 based on the input of the information received as described above. For example, when controlling the power output by the power generation unit 10, the output control unit 70 may ensure that the power command from the electric utility is satisfied. Furthermore, for example, when controlling the power output by the power generation unit 10, the output control unit 70 may reduce the difference between the planned and actual amount of power to be reverse-flowed from the base where the power control system 1 is installed to the power grid, based on the power demand at the base.

In this way, for example, the output control unit 70A may control the power output by the power generation unit 10 so as to satisfy the power command from the electric utility company and reduce the difference between the planned and actual amount of power flowing back from the first base to the power grid based on the power demand.

The output control unit 70 may also control the power input to the power adjustment unit 20 and/or the power output from the power adjustment unit 20 based on the input of the information received as described above. For example, the output control unit 70 may satisfy the power command from the electric utility when controlling the power input to the power adjustment unit 20 and/or the power output from the power adjustment unit 20. Furthermore, for example, the output control unit 70 may reduce the difference between the planned and actual amounts of power flowing back from the base where the power control system 1 is installed to the power grid based on the power demand at the base where the power control system 1 is installed when controlling the power output from the power adjustment unit 20.

In this way, for example, the output control unit 70A may control at least one of the charging and discharging of the storage battery at the first location so as to satisfy the power command from the electric utility and reduce the difference between the planned and actual amount of power flowing back from the first location to the power grid based on the power demand.

The output control unit 70 may transmit an output control value (e.g., %) to the power generation unit 10 for controlling the power output by the power generation unit 10. In this manner, the output control unit 70 may set the output control value to the power generation unit 10. Furthermore, the power adjustment unit 20 may transmit an adjustment value (e.g., %) to the power adjustment unit 20 for adjusting the power input to the power adjustment unit 20 and/or the power output from the power adjustment unit 20. In this manner, the output control unit 70 may set the adjustment value to the power adjustment unit 20.

When the output control unit 70 controls the power generation unit 10 and/or the power adjustment unit 20, it is ideal to make the difference between the planned amount of power to be reversed to the power grid and the actual amount zero. In other words, when the output control unit 70 performs control, it is ideal to make the planned amount of power to be reversed to the power grid the same as the actual amount at the same time (same amount at the same time). In other words, it is desirable to make the plan of the power to be reversed as self-consignment equal to the power to be actually reversed as self-consignment. However, for example, a situation is assumed in which the actual power generation (actual amount) is not the same as the power generation plan (plan). Therefore, in one embodiment, when the output control unit 70 performs control, it may be possible to reduce the difference between the planned amount of power to be reversed to the power grid and the actual amount as much as possible. If the planned amount of power to be reversed to the power grid does not completely match the actual amount, the difference may be settled as an imbalance fee.

Next, we will further explain self-consignment using the power control system 1A and power control system 1B shown in Figure 1.

Hereinafter, as an example, the power control system 1A at the first base and the power control system 1B at the second base will be described as facilities owned and/or managed by a certain company X (hereinafter, appropriately referred to as Company X). Here, Company X may be another company other than the company itself, for example, a jointly established association that has a close relationship with the company itself. In particular, the power control system 1A at the first base is, as an example, a solar power generation facility owned and/or managed by Company X. Also, the power control system 1B at the second base is, as an example, a production factory facility owned and/or managed by Company X. Then, a situation (self-consignment) will be described in which the power generated in the power control system 1A at the first base (for example, the power generation unit 10A) is reverse-flowed to the power grid and transmitted to the second base, and consumed in the power control system 1B (for example, the load 30B). In this case, the first base having the power generation unit 10A and the second base having the load 30B are different power receiving locations. In one embodiment, when implementing self-transmission, an attempt is made to calculate the planned amount of power generation while taking output suppression into account.

In self-consignment, the condition for simultaneous and equal planned power generation is that the planned (scheduled) amount of power to be back-flowed to the power grid and the actual amount of power that is back-flowed (actual) must match (as much as possible). That is, in FIG. 1, the information transmitted from smart meter 40 to output control unit 70 regarding the information on the power that is back-flowed from the power generated by power generation unit 10 (e.g., the amount of power) is planned (scheduled) and the actual amount of power that is back-flowed (actual) must match (as much as possible).

For example, if the amount of power actually generated (performance) is less than the amount of power (planned) in the generated power generation plan, the difference between the two amounts of power that is insufficient is called a shortage imbalance. In this case, the condition that the plan (plan) for the amount of power to be reversed to the power grid and the amount of power actually reversed (performance) match is not met (power generation imbalance). On the other hand, for example, if the amount of power actually generated (performance) is greater than the amount of power (planned) in the generated power generation plan, the difference between the two amounts of power that is insufficient is called a surplus imbalance. In this case, too, the condition that the plan (plan) for the amount of power to be reversed to the power grid and the amount of power actually reversed (performance) match is not met (power generation imbalance). Therefore, the power control system 1 according to one embodiment controls power so as to reduce such power generation imbalance.

Figure 2 is a flowchart explaining the operation of the power control system 1A of the first base. Below, with reference to Figure 2, we will further explain the operation of simultaneously matching the planned power generation values while taking output suppression into account when realizing self-consignment by the power control system 1A and the power control system 1B.

The operation shown in FIG. 2 may be performed for each time period that is divided into 30-minute increments over a 24-hour period in a day. In other words, the operation shown in FIG. 2 may be performed a maximum of 48 times over a 24-hour period in a day.

First, as an example, we will explain the operation performed at 12:00 on the day before the day (today) on which the power control system 1A performs power control. In this case, the operation shown in FIG. 2 may target a total of 48 frames divided into 30-minute time periods on the day.

2 starts, the demand calculation unit 50A of the power control system 1A at the first base calculates the initial power demand at the first base (step S11). Here, the initial power demand at the first base may be, for example, the initial power demand due to the load 30A. In step S11, the demand calculation unit 50A may calculate the initial power demand at the first base based on the power information received from the smart meter 40 and the initial weather data received from the weather server 200. The information on the initial power demand at the first base calculated by the demand calculation unit 50A in step S11 may be transmitted to the simultaneous power calculation unit 60A.

Next, the simultaneous power generation balancing calculation unit 60A generates an initial power generation plan for the first base (step S13). In step S13, the simultaneous power generation balancing calculation unit 60A may generate an initial power generation plan for the first base based on the initial power demand information for the first base received from the demand calculation unit 50A and the initial weather data received from the weather server 200. The initial power generation plan generated in step S13 may be transmitted to the wide-area organization server 300 and the output control unit 70A.

Next, the output control unit 70A may store, for example, a process for controlling the output of power generated by the power generation unit 10 in any storage unit, for example, internally (step S15). In step S15, the output control unit 70A may control the output of power generated by the power generation unit 10 based on the initial power generation plan received from the simultaneous power generation calculation unit 60A. In step S15, the output control unit 70A may transmit an initial output control value to the power generation unit 10. This allows the power generation unit 10 to control the output based on the initial output control value.

Next, as an example, we will explain the operation that is performed on the day before and up to the day (today) on which the power control system 1A performs power control. In this case, the operation shown in FIG. 2 may target a total of 48 frames divided into 30-minute time periods on the day.

2 starts, the demand calculation unit 50A of the power control system 1A at the first base calculates the updated power demand at the first base (step S11). Here, the updated power demand at the first base may be, for example, the updated power demand due to the load 30A. In step S11, the demand calculation unit 50A may calculate the updated power demand at the first base based on the power information received from the smart meter 40 and the updated weather data received from the weather server 200. The information on the updated power demand at the first base calculated by the demand calculation unit 50A in step S11 may be transmitted to the simultaneous power calculation unit 60A.

Next, the simultaneous balancing calculation unit 60A calculates the simultaneous balancing amount at the first base and generates an updated power generation plan (step S13). In step S13, the simultaneous balancing calculation unit 60A may calculate the simultaneous balancing amount at the first base and generate an updated power generation plan based on the updated power demand information at the first base received from the demand calculation unit 50A and the updated weather data received from the weather server 200. The updated power generation plan generated in step S13 may be transmitted to the wide-area organization server 300 and the output control unit 70A.

Next, the output control unit 70A may control, for example, the updated output of the power generated by the power generation unit 10 (step S15). In step S15, the output control unit 70A may control the updated output of the power generated by the power generation unit 10 based on the updated power generation plan received from the simultaneous power generation calculation unit 60A and the updated power command value received from the power server 200. In step S15, the output control unit 70A may transmit the updated output control value to the power generation unit 10. This allows the power generation unit 10 to control the output based on the updated output control value.

Next, as an example, we will explain the operation performed one hour before the day (current day) on which the power control system 1A performs power control. In this case, the operation shown in FIG. 2 may target a 30-minute time limit one hour or more after the current day.

2 starts, the demand calculation unit 50A of the power control system 1A at the first base calculates the final power demand at the first base (step S11). Here, the final power demand at the first base may be, for example, the final power demand by the load 30A. In step S11, the demand calculation unit 50A may calculate the final power demand at the first base based on the power information received from the smart meter 40 and the final weather data received from the weather server 200. The information on the final power demand at the first base calculated by the demand calculation unit 50A in step S11 may be transmitted to the simultaneous load calculation unit 60A.

Next, the simultaneous balancing calculation unit 60A calculates the simultaneous balancing amount at the first base and generates a final power generation plan (step S13). In step S13, the simultaneous balancing calculation unit 60A may calculate the simultaneous balancing amount at the first base and generate a final power generation plan based on the final power demand information at the first base received from the demand calculation unit 50A and the final weather data received from the weather server 200. The final power generation plan generated in step S13 may be transmitted to the wide-area organization server 300 and the output control unit 70A.

Next, the output control unit 70A may control, for example, the further updated output of the power generated by the power generation unit 10 (step S15). In step S15, the output control unit 70A may control the further updated output of the power generated by the power generation unit 10 based on the final power generation plan received from the simultaneous power generation calculation unit 60A and the updated power command value received from the power server 200. In step S15, the output control unit 70A may transmit the further updated output control value to the power generation unit 10. This allows the power generation unit 10 to control the output based on the further updated output control value.

Next, as an example, we will explain the operation performed by the power control system 1A 0 hours before the day (current day) on which power control is performed. In this case, the operation shown in FIG. 2 may target a time limit of 30 minutes before 0 hours of the current day.

2 starts, the demand calculation unit 50A of the power control system 1A at the first base calculates the final power demand at the first base (step S11). Here, the final power demand at the first base may be, for example, the final power demand by the load 30A. In step S11, the demand calculation unit 50A may calculate the final power demand at the first base based on the power information received from the smart meter 40 and the final weather data received from the weather server 200. The information on the final power demand at the first base calculated by the demand calculation unit 50A in step S11 may be transmitted to the simultaneous balance calculation unit 60A. This operation may be performed in addition to the operation of step S11 in the operation performed one hour before the day (current day) on which the power control system 1A performs power control.

Next, the simultaneous balancing calculation unit 60A calculates the simultaneous balancing amount at the first base and generates a final power generation plan (step S13). In step S13, the simultaneous balancing calculation unit 60A may calculate the simultaneous balancing amount at the first base and generate a final power generation plan based on the final power demand information at the first base received from the demand calculation unit 50A and the final weather data received from the weather server 200. The final power generation plan generated in step S13 may be transmitted to the wide-area organization server 300 and the output control unit 70A. This operation may be performed in addition to the operation of step S13 in the operation performed one hour before the day (current day) on which the power control system 1A performs power control described above.

Next, the output control unit 70A may control the final output of the power generated by the power generation unit 10, for example (step S15). In step S15, the output control unit 70A may control the final output of the power generated by the power generation unit 10 based on the final power generation plan received from the simultaneous power generation calculation unit 60A and the final power command value received from the power server 200. In step S15, the output control unit 70A may transmit the final output control value to the power generation unit 10. This allows the power generation unit 10 to control the output based on the final output control value. This operation may be performed in addition to the operation of step S15 in the operation performed one hour before the day (current day) on which the power control system 1A performs power control described above.

Next, power control by the power control system 1A will be further explained with specific examples with reference to Figures 3 to 6.

In Figures 3 to 6, the horizontal axis indicates time, and the vertical axis indicates the power generation capacity ratio. In Figures 3 to 6, the horizontal axis indicates 24 hours of a day divided into 30-minute increments (48 divisions). The horizontal axis in Figures 3 to 6 may start at midnight and end at 11:59 pm. In Figures 3 to 6, the power generation capacity ratio on the vertical axis may be expressed in units of, for example, [%]. Here, the power generation capacity ratio [%] may be calculated by converting the smaller of the capacity of the solar cell included in power generation unit 10A and the capacity of the PCS included in power generation unit 10A into 100, for example.

Figure 3 shows a case where the planned power demand calculated by the demand calculation unit 50A is greater than the planned power of the power command received from the power server 200 at the time the power generation plan is generated. In Figure 3, the planned power (power generation plan) to be generated by the power generation unit 10A is shown by a curve. As shown in Figure 3, the predicted power generation (power generation plan) of the power generation unit 10A is almost zero at the start of midnight, peaks at noon in the center of the graph, and is again almost zero at the end of 23:59.

In the case shown in FIG. 3, the output control unit 70A subjects the area where the planned power generated by the power generation unit 10A (planned power generation) exceeds the planned power demand to output control (planned output control value). In other words, in this case, the area where the planned power command power is exceeded but the planned power demand is not exceeded is not subject to output control.

Figure 4 shows a case where a power generation plan (plan) like that shown in Figure 3 has been generated, but the actual power demand is less than the plan. Assume that the actual power generation (actual power generation) by the power generation unit 10A shown in Figure 4 is approximately the same as the planned power generation shown in Figure 3. Also assume that the actual power command power received from the power server 200 shown in Figure 4 is approximately the same as the planned power command power shown in Figure 3. On the other hand, as shown in Figure 4, the actual power demand power is less than the planned power demand power shown in Figure 3, and is less than the actual power command power shown in Figure 4.

In the case shown in FIG. 4, the output control unit 70A subjects the area where the power actually generated by the power generation unit 10A (actual power generation) exceeds the actual power command to output control (actual output control value). However, in such a case, the area where the power actually generated by the power generation unit 10A (actual power generation) exceeds the actual power demand is not subject to output control. In other words, in this case, the area that exceeds the actual power demand but does not exceed the planned power of the actual power command becomes reverse flow power (actual reverse flow).

As shown in FIG. 3, at the time when the power generation plan (plan) was generated, no power was being generated to cause reverse power flow. Therefore, if actual reverse power flow were to occur as shown in FIG. 4, this would cause an imbalance in power generation, which is undesirable. Therefore, the output control unit 70A controls the power generation unit 10 and/or the power adjustment unit 20 so that the situation shown in FIG. 4 does not occur.

Figure 5 is a diagram illustrating an example of the operation actually performed by the output control unit 70A when a situation like that shown in Figure 4 is likely to occur in the power control system 1A. In Figure 4, if the area where the power actually generated by the power generation unit 10A (actual power generation) exceeds the actual power demand is not subject to output control, an imbalance in power generation will occur. Therefore, as shown in Figure 5, the output control unit 70A subjects the area where the power actually generated by the power generation unit 10A (actual power generation) exceeds the actual power demand as the output control (actual output control value). By controlling in this way, in the power control system 1A, no reverse power flow will be generated, just as at the time when the power generation plan (schedule) was generated.

Figure 6 is a diagram illustrating another example of the operation actually performed by the output control unit 70A when the situation shown in Figure 4 is likely to occur in the power control system 1A. In Figure 4, if the area in which the power actually generated by the power generation unit 10A (actual power generation) exceeds the actual power demand is not subject to output control, power will flow back to the grid power (actual back flow). Therefore, the output control unit 70A may charge the amount of power shown as the actual back flow in Figure 4 to the storage battery of the power adjustment unit 20A as shown in Figure 6 (actual adjustment value). Even with this control, no power will flow back in the power control system 1A, just like when the power generation plan (schedule) was generated.

In this way, the power control system 1 according to one embodiment can realize self-delivery of generated power while satisfying the power command from the electric utility company.

Next, power control by the power control system 1A will be further explained with other specific examples with reference to Figures 7 to 11.

In Figures 7 to 11, similar to Figures 3 to 6, the horizontal axis indicates time and the vertical axis indicates the power generation capacity ratio.

Figure 7 shows a case where the planned power of the power command received from the power server 200 is greater than the planned power of the power demand calculated by the demand calculation unit 50A at the time the power generation plan is generated. In Figure 7, as in Figure 3, the planned power to be generated by the power generation unit 10A (planned power generation) is shown by a curve.

In the case shown in FIG. 7, the output control unit 70A subjects the area where the planned power generated by the power generation unit 10A (planned power generation) exceeds the planned power of the power command to output control (planned output control value). In other words, in this case, the area where the planned power of the power demand is exceeded but the planned power of the power command is not subjected to output control. In such a case, in the area where the planned power generated by the power generation unit 10A (planned power generation) exceeds the planned power of the power demand but does not exceed the planned power of the power demand, power can be reversed (planned reverse flow).

Figure 8 shows a case where a power generation plan (plan) like that shown in Figure 7 was generated, but the actual power demand was greater than planned. The actual power generated by the power generation unit 10A shown in Figure 8 (actual power generation) is assumed to be approximately the same as the planned power generation shown in Figure 7. The actual power command power received from the power server 200 shown in Figure 8 is also assumed to be approximately the same as the planned power command power shown in Figure 7. On the other hand, as shown in Figure 8, the actual power demand power is greater than the planned power demand power shown in Figure 7, but less than the actual power command power shown in Figure 8.

In the case shown in FIG. 8, the output control unit 70A targets the region where the power actually generated by the power generation unit 10A (actual power generation) exceeds the actual power command as the output control value (actual output control value). In such a case, the region that exceeds the power of the actual power demand but does not exceed the planned power of the actual power command becomes the power that flows backward (actual reverse flow). However, in this case, the amount of power that flows backward (actual reverse flow) shown in FIG. 8 is less than the amount of power that flows backward (planned reverse flow) shown in FIG. 7. Therefore, if an actual reverse flow occurs as shown in FIG. 8, an imbalance will occur, which is undesirable. For this reason, the output control unit 70A controls the power generation unit 10 and/or the power adjustment unit 20 so that the situation shown in FIG. 8 does not occur.

Figure 9 is a diagram illustrating an example of the operation actually performed by the output control unit 70A when the situation shown in Figure 8 is likely to occur in the power control system 1A. In Figure 8, if the reverse flow power (actual reverse flow) is not increased, an imbalance will occur. Therefore, as shown in Figure 9, the output control unit 70A compensates for the power shortage in the reverse flow power (actual reverse flow) with the power discharged by the power adjustment unit 20A (actual adjustment value). In other words, the output control unit 70A controls so that the power discharged by the power adjustment unit 20A (actual adjustment value) is added to the reverse flow power (actual reverse flow). By controlling in this way, the power control system 1A can generate the same amount of reverse flow power as at the time when the power generation plan (plan) was generated (Figure 7) (Figure 9).

In this way, the power control system 1 according to one embodiment can realize self-delivery of generated power while satisfying the power command from the electric utility company.

Figure 10 shows a case where a power generation plan (plan) like that shown in Figure 7 has been generated, but the actual power demand is less than planned. It is assumed that the actual power generated by the power generation unit 10A shown in Figure 10 (actual power generation) is approximately the same as the planned power generation shown in Figure 7. It is also assumed that the actual power command power received from the power server 200 shown in Figure 10 is approximately the same as the planned power command power shown in Figure 7. On the other hand, it is assumed that the actual power demand power shown in Figure 10 is less than the planned power demand power shown in Figure 7.

In the case shown in FIG. 10, the output control unit 70A targets the region where the power actually generated by the power generation unit 10A (actual power generation) exceeds the actual power command as the output control value (actual output control value). In such a case, the region that exceeds the actual power demand but does not exceed the planned power of the actual power command becomes reverse flow power (actual reverse flow). However, in this case, the amount of reverse flow power (actual reverse flow) shown in FIG. 10 is greater than the amount of reverse flow power (planned reverse flow) shown in FIG. 7. Therefore, if an actual reverse flow occurs as shown in FIG. 10, an imbalance will occur, which is undesirable. For this reason, the output control unit 70A controls the power generation unit 10 and/or the power adjustment unit 20 so that the situation shown in FIG. 10 does not occur.

Figure 11 is a diagram illustrating an example of the operation actually performed by the output control unit 70A when the situation shown in Figure 10 is likely to occur in the power control system 1A. In Figure 10, if the reverse flow power (actual reverse flow) is not reduced, an imbalance will occur. Therefore, the output control unit 70A charges the power adjustment unit 20A with the surplus power amount of the reverse flow power (actual reverse flow) shown in Figure 10 (actual adjustment value) as shown in Figure 11. In other words, the output control unit 70A controls so that a part of the reverse flow power (actual reverse flow) is charged to the power adjustment unit 20A (actual adjustment value). By controlling in this way, the power control system 1A can generate the same amount of reverse flow power as at the time when the power generation plan (plan) was generated (Figure 7) (Figure 11).

In this way, the power control system 1 according to one embodiment can realize self-delivery of generated power while satisfying the power command from the electric utility company.

As described above, when the amount of power (planned) in the generated power generation plan does not match the amount of power actually generated (actual), a shortage imbalance or surplus imbalance occurs. In such a case, the condition that the plan (planned) amount of power to be reverse-flowed to the power grid matches the amount of power actually reverse-flowed (actual) is not met (power generation imbalance). As a measure against the surplus imbalance, the actual power generation can be reduced by controlling the power generation output. Therefore, the surplus imbalance can be reduced to zero by controlling the power generation output. However, it is difficult to reduce the shortage imbalance to zero by controlling the power generation output. Therefore, it is also possible to reduce the amount of power in the power generation plan in advance in the power generation plan.
However, in this case, the reduced amount of power (the amount of imbalance) is subjected to output control, resulting in waste.

Therefore, by connecting solar panels that exceed the rated output power of the PCS, so-called overloading, the rated output of the PCS can be used as the actual power generation, making it difficult for shortage imbalances to occur. Doing so can also make it difficult for output control with surplus imbalances to occur. Furthermore, by reducing the rated output power of the PCS, it is expected that the cost of the PCS can be reduced. By realizing an overloaded state, the planned amount of power generation can be suitably executed at the same time, thereby suppressing imbalances and increasing profits. Furthermore, according to the power control system 1 of one embodiment, the power can be adjusted in the power adjustment unit 20. Therefore, the imbalance can be adjusted by adjusting the power in the power adjustment unit 20.

As in the above-described embodiment, in the case of self-consignment, the first base and the second base may be different bases. In one embodiment, the simultaneous equal amount calculation unit 60 may calculate the amount of power to be reverse-flowed from the first base to the power grid in a specified time period and supplied to the second base based on the power demand and the amount of power generated by the power generation unit of the first base. Also, in one embodiment, the output control unit 70 may perform control so as to satisfy the power command from the electric utility and reduce the difference between the planned and actual amount of power to be reverse-flowed from the first base to the power grid and supplied to the second base based on the power demand.

The above-mentioned embodiments have been described as representative examples, but it will be apparent to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited by the above-mentioned embodiments, and various modifications and changes are possible without departing from the scope of the claims. For example, it is possible to combine multiple configuration blocks shown in the configuration diagram of the embodiment into one, or to divide one configuration block.

The above-described embodiments are not limited to implementation as a system such as power control system 1A and/or power control system 1B. For example, the above-described embodiments may be implemented as a device (e.g., a power control device) that constitutes at least a part of a system such as power control system 1A and/or power control system 1B.

The above-mentioned embodiment has been described as an implementation of a system such as the power control system 1A at the first base and the power control system 1B at the second base. However, the system according to one embodiment may include not only the power control system 1A at the first base and the power control system 1B at the second base, but also the power control system 1C at the third base, or may include more than one power control system. In this case, for example, the simultaneous equal amount calculation unit 60A may calculate the amount of power that flows back from the first base to the power grid in a predetermined time segment and is supplied to multiple bases other than the first base, based on the power demand at the first base and the amount of power generated by the power generation unit at the first base. In addition, the output control unit 70A may perform control so as to satisfy the power command from the electric utility and reduce the difference between the planned amount of power that flows back from the first base to the power grid and is supplied to multiple bases other than the first base, based on the power demand.

The above-mentioned embodiment has been described assuming a case where the power generated by the power generating unit 10A at the first base is self-consigned to the load 30B at the second base. However, as described above, in one embodiment, the power generated by the power generating unit 10B at the second base may be self-consigned to the load 30A at the first base. In this case, the simultaneous parallel amount calculation unit 60A may calculate the amount of power that flows back from the second base to the power grid in a predetermined time segment and is supplied to the first base based on the power demand of the second base and the amount of power generated by the power generating unit at the second base. In addition, the output control unit 70A may perform control so as to satisfy the power command from the electric utility and reduce the difference between the planned amount of power that flows back from the second base to the power grid and is supplied to the first base based on the power demand of the second base.

In the above-described embodiment, a system such as the power control system 1 may include a power generation unit 10 that performs solar power generation or the like. In this case, for example, the power control system 1A may include a power generation unit 10A installed at a first base, and the power control system 1B may include a power generation unit 10B installed at a second base. On the other hand, a system such as the power control system 1 may not include the power generation unit 10 as a system that controls the power generation unit 10 that performs solar power generation or the like.

The above-described embodiment may also be implemented, for example, as a control method for the above-described system or device. The above-described embodiment may also be implemented, for example, as a program executed on a computer of the above-described system or device. Furthermore, the above-described embodiment may also be implemented, for example, as a recording medium on which a program executed on a computer of the above-described system or device is recorded, i.e., a computer-readable recording medium.

REFERENCE SIGNS LIST 1 Power control system 10 Power generation unit 20 Power adjustment unit 30 Load 40 Smart meter 50 Demand calculation unit 60 Simultaneous and equal amount calculation unit 70 Output control unit 200 Power server 300 Cross-regional organization server 400 Weather server

Claims (14)

A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls power generation of the power generation unit so as to reduce a difference between a planned amount of power flowing back from the first base to the power grid and an actual amount of power flowing back from the first base to the power grid when the power demand becomes smaller than planned, and controls the power generated by the power generation unit so as not to exceed a power command from an electric utility company ;
A power control system comprising: A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls the power output by the power generation unit so as to satisfy a power command from an electric power utility and reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the first base to the power grid based on the power demand;
A power control system comprising:
A power control system in which the rated output of the power control system is regarded as the actual power generation result by connecting the power generation unit that exceeds the rated output power of the power control system. A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls charging of the storage battery at the first base so as to reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the first base, so that the power that the power generation unit reverse-flows does not exceed a power command from the electric power utility, when the power demand is less than planned, and controls discharging of the storage battery at the first base so as to reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the power generation unit, so that the power that the power generation unit reverse-flows does not exceed a power command from the electric power utility , when the power demand is more than planned;
A power control system comprising: The output control unit is
4. The power control system according to claim 3, wherein, when the power demand is less than planned, charging of the storage battery at the first location is controlled so as to reduce a difference between the planned and actual amount of power to be flowed back from the first location to the power grid, so that the sum of the power generated by the power generation unit and the power charged to the storage battery is within a range that does not exceed a power command by an electric power utility, and when the power demand is more than planned, discharging of the storage battery at the first location is controlled so as to reduce a difference between the planned and actual amount of power to be flowed back from the first location to the power grid, so that the sum of the power generated by the power generation unit and the power discharged from the storage battery is within a range that does not exceed a power command by an electric power utility. The power generation unit is further provided,
The power control system according to claim 1 , wherein the power generation unit is installed at the first base. The power control system according to any one of claims 1 to 5, wherein the simultaneous power balance calculation unit calculates the amount of power to be reverse-flowed from the first base to the power grid in a specified time interval and to be supplied to a second base different from the first base, based on the power demand and the amount of power generated by the power generation unit of the first base. The power control system according to any one of claims 1 to 6, wherein the output control unit performs control so as to satisfy a power command from an electric utility company and reduce the difference between the planned amount of power to be reverse-flowed from the first base to the power grid and supplied to a second base different from the first base based on the power demand, and the actual amount of power to be supplied. The power control system according to any one of claims 1 to 5, wherein the simultaneous balancing calculation unit calculates the amount of power to be supplied to the first base from the second base in a specified time interval based on the power demand of a second base different from the first base and the amount of power generated by a power generation unit of the second base. The power control system of any one of claims 1 to 5 or claim 8, wherein the output control unit performs control so as to satisfy a power command from an electric utility company and, based on the power demand of a second base different from the first base, reduce the difference between the planned and actual amount of power to be supplied to the first base and the amount of power to be reverse-flowed from the second base to the power grid . The power control system according to any one of claims 1 to 5, wherein the simultaneous power balance calculation unit calculates the amount of power to be reverse-flowed from the first base to the power grid in a specified time interval and to be supplied to a plurality of bases other than the first base, based on the power demand and the amount of power generated by the power generation unit of the first base. The power control system of any one of claims 1 to 5 or claim 10, wherein the output control unit performs control so as to satisfy a power command from an electric utility company and reduce the difference between the planned and actual amounts of power to be flowed back from the first base to the power grid based on the power demand and to be supplied to a plurality of bases other than the first base. A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls power generation of the power generation unit so as to reduce a difference between a planned amount of power flowing back from the first base to the power grid and an actual amount of power flowing back from the first base to the power grid when the power demand becomes smaller than planned, and controls the power generated by the power generation unit so as not to exceed a power command from an electric utility company ;
A power control device comprising: A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls the power output by the power generation unit so as to satisfy a power command from an electric power utility and reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the first base to the power grid based on the power demand;
A power control device comprising:
A power control device that, by connecting the power generation unit that exceeds the rated output power of the power device, makes the rated output of the power control device its actual power generation result. A demand calculation unit that calculates an electricity demand of a first base;
a power balance calculation unit that calculates an amount of power to be reverse-flowed from the first base to the power grid in a predetermined time segment based on the power demand and an amount of power generated by a power generation unit at the first base;
an output control unit that controls charging of the storage battery at the first base so as to reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the first base, so that the power that the power generation unit reverse-flows does not exceed a power command from the electric power utility, when the power demand is less than planned, and controls discharging of the storage battery at the first base so as to reduce a difference between a planned amount of power to be reverse-flowed from the first base to the power grid and an actual amount of power to be reverse-flowed from the power generation unit, so that the power that the power generation unit reverse-flows does not exceed a power command from the electric power utility , when the power demand is more than planned;
A power control device comprising:

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