JP6444209B2 - Energy management equipment - Google Patents

Description

  The present invention relates to an energy management apparatus that manages electric power.

  In recent years, an apparatus and a system for selling electric power generated by a solar power generation panel in each home to a system are becoming widespread. In addition, a system for storing surplus power other than power supplied to the load among the generated power of the photovoltaic power generation panel or inexpensive midnight power from the system power supply in a power storage device such as a storage battery is also becoming widespread (for example, Patent Documents). 1 and 2).

JP 2011-92002 A JP 2014-103811 A

  Patent Documents 1 and 2 and the conventional renewable energy purchase system use the “push-up effect” that increases the amount of renewable energy sold during the day by suppressing the consumption of electricity stored in the power storage device in the home. Techniques to do this have been proposed. In addition, compared with the price of electricity purchased from the electric power company and the cost of using electricity stored in the power storage device, solar A technique for optimizing the power usage fee by predicting the amount of power generated by the power generation panel and storing inexpensive late-night power in a power storage device has been proposed.

  However, although any technology can optimize the profits for consumers, it is impossible for electric power companies to expect stable discharge power from consumers. There was a problem that was difficult.

  Therefore, the present invention has been made in view of the above-described problems, and it is possible to expect an appropriate profit for the consumer, and it is possible for the electric power company to stably purchase power from the consumer. The purpose is to provide technology.

The energy management device according to the present invention performs DC-AC conversion on the power obtained by adding the second power discharged from the power storage device to the first power generated from the natural energy by the power generation device, and after the conversion By controlling the second power based on a power conditioner unit capable of supplying power to the load as power consumption and discharging the power to the system power supply of the electric power company as discharge power, and a predetermined expected integrated discharge amount And a control unit for controlling the discharge power of the power conditioner unit. Of the integrated discharge amount obtained by integrating the discharge power for a predetermined period, the unit price of purchase by the electric power company for a discharge amount larger than a predetermined threshold is greater than the predetermined threshold. The control unit uses a discharge amount for the predetermined threshold as the expected integrated discharge amount, which is lower than the purchase unit price for a small discharge amount.

  ADVANTAGE OF THE INVENTION According to this invention, a consumer can acquire a suitable profit and the electric power company can purchase electric power stably from a consumer.

1 is a block diagram showing a configuration of an energy management system according to Embodiment 1. FIG. It is a figure which shows an example of the electricity bill traded between an electric power provider and a consumer. It is a figure which shows the purchase unit price by the electric power company which concerns on Embodiment 1. FIG. It is a figure for demonstrating the power sale profit of the consumer by the energy management apparatus which concerns on Embodiment 1. FIG. It is a figure for demonstrating the power sale profit of the consumer by the energy management apparatus which concerns on Embodiment 1. FIG. It is a figure for demonstrating the power sale profit of the consumer by the energy management apparatus which concerns on Embodiment 1. FIG. 6 is a flowchart showing an operation of the energy management system according to the second embodiment. 10 is a diagram for explaining the operation of the energy management system according to Embodiment 3. FIG. It is a block diagram which shows the structure of the energy management system which concerns on a modification.

<Embodiment 1>
FIG. 1 is a block diagram showing a configuration of an energy management system including an energy management device according to Embodiment 1 of the present invention.

  The energy management system in FIG. 1 includes a solar power generation device 1, a power storage device 2, an electric utility system power supply 3, a power control device 4, a power measurement device 5, a distribution board 6, and a load 7. Is provided. The power control device 4 includes a power conditioner unit 4a and a control unit 4b.

  The energy management device 21 according to the first embodiment includes a power conditioner unit 4a, a control unit 4b, and a power measurement device 5 among the above-described components.

  The solar power generation device 1 is an example of a power generation device that generates power from renewable natural energy, and generates power from light energy. Instead of the solar power generation device 1, a power generation device such as a wind power generation device or a hydroelectric power generation device may be applied.

  The power storage device 2 is an example of a power storage device capable of storing energy (electric power) and releasing the energy (electric power). Instead of the power storage device 2, for example, a storage battery, a fuel cell, or a chargeable / dischargeable electric vehicle may be applied.

  The distribution board 6 is connected to the system power supply 3 via the power measuring device 5 and is also connected to the power control device 4 and the load 7 of the customer. The power supplied from the system power supply 3 to the distribution board 6 via the power measuring device 5 is appropriately supplied to the load 7 and the power control device 4. On the other hand, the power discharged from the power control device 4 to the distribution board 6 is appropriately discharged to the system power supply 3 via the load 7 and the power measurement device 5.

  The power measuring device 5 measures the amount of power discharged from the power control device 4 to the system power supply 3. Further, the power measuring device 5 measures the amount of power supplied from the system power supply 3 to the load 7 and the power control device 4 through the distribution board 6.

  The power conditioner unit 4a of the power control device 4 performs DC / AC conversion or AC / DC conversion of power, and discharges and charges the power storage device 2 and the like according to control from the control unit 4b. In the first embodiment, the power conditioner unit 4a adds the second power discharged from the power storage device 2 to the first power generated from the light energy in the solar power generation device 1, and the power obtained thereby. DC / AC conversion is performed. And the power conditioner part 4a is comprised so that it can discharge to the system power supply 3 as discharge electric power while supplying the electric power after conversion to the load 7 as power consumption. The discharge power from the power conditioner unit 4a is measured by the power measurement device 5 that is a power measurement unit.

  In the following description, the above-described first power in the solar power generation device 1 is referred to as “generated power”, and the above-described second power in the power storage device 2 is referred to as “power storage device discharge power”.

  The control unit 4b of the power control device 4 is realized as a function of the processor when a processor such as a CPU (Central Processing Unit) executes a program stored in a memory or the like. However, the control unit 4b is not limited to this, and for example, a plurality of processors may be implemented in cooperation. Instead of the control unit 4b that operates according to the software program, the control unit 4b may be realized by a signal processing circuit that realizes the operation by a hardware electric circuit. As a concept combining the software control unit 4b and the hardware control unit 4b, the word “processing circuit” may be used instead of the word “part”.

  The control unit 4b receives the power measurement value of the power measurement device 5 by performing wireless communication, wired communication, or power line communication with the power measurement device 5, and based on the power measurement value, the direct current in the power conditioner unit 4a It controls AC conversion and AC / DC conversion, switching between discharge and charge, and the like.

  The control unit 4b controls the discharge power of the power conditioner unit 4a by controlling the power storage device discharge power based on a predetermined expected integrated discharge amount. For example, the control unit 4b controls connection and disconnection of a relay (not shown) between the power storage device 2 and the power conditioner unit 4a, or an inverter device (not shown) so that the discharge power from the power storage device 2 can be controlled. The execution voltage is controlled in a device that outputs AC power.

  Hereinafter, the discharge amount obtained by integrating the discharge power of the power conditioner unit 4a during a predetermined period (here 1 day) is referred to as “integrated discharge amount”, and the predetermined period (here 1 day). The discharge amount obtained by integrating the expected discharge amount is described as “expected integrated discharge amount”.

  In the first embodiment, as an example of the above control, the control unit 4b is based on an integrated discharge amount obtained by integrating the discharge power measured by the power measuring device 5 and an expected integrated discharge amount obtained by integrating the expected discharge amount. The discharge power of the power conditioner unit 4a is controlled.

  In the first embodiment, the control unit 4b performs the above-described control so that the integrated discharge amount becomes as high as possible an expected integrated discharge amount as much as possible.

  According to the energy management device 21 configured as described above, it is expected that power that cannot be generated by the solar power generation device 1 due to the influence of weather and temperature is covered by the power storage device discharge power of the power storage device 2. An integrated discharge amount that is the same as or close to the integrated discharge amount can be discharged to the system power supply 3. As a result, when the expected integrated discharge amount is set appropriately, the discharge power is stably supplied to the system power source 3 with an appropriate discharge amount regardless of the weather or temperature, as will be described below. Can be discharged. As a result, smoothing of the power supply amount in units of a predetermined period (here, one day) can be expected.

  In recent years, a renewable energy purchase system using natural energy has been operated. According to this system, the consumer can make a profit by discharging the discharged power from the energy management device 21 to the system power supply 3, that is, selling power from the consumer to the electric utility. However, a consumer wants to gain profit by storing cheap midnight power in the power storage device 2 from the grid power source 3 of the power company and selling it to the power company during the day when the power is expensive. It is called “electric laundering” and it is illegal. Hereinafter, electric laundering will be described with specific examples.

  FIG. 2 is a diagram illustrating an example of an electricity bill traded between an electric power company and a consumer.

  FIG. 2A is a diagram illustrating a unit price of electricity used by a consumer to purchase power from the system power supply 3 of the electric utility, that is, a unit price of electric power sold by the electric utility (a unit price of purchase by the consumer). The unit price is a price per unit power amount.

  FIG. 2B is a diagram showing a unit price at which the electric company purchases the discharged power from the energy management device 21 of the consumer, that is, a unit price of purchase by the electric company (unit price of electricity sold by the consumer). In FIG. 2B, the unit price of purchase by the electric power company is constant regardless of the amount of power purchased.

  In the example of FIG. 2, after a consumer purchases electric power from an electric power company at the late-night unit price Pn (11 yen / KWh) in FIG. 2A and stores the electric power in the power storage device 2, the stored electric power is Assume that power is sold to an electric power company at a unit price SP (37 yen / KWh) in FIG. In this case, “(Pn−SP) × discharge amount (amount of electric power sold)” is the benefit of the consumer, but obtaining such a benefit is prohibited as being applicable to electric laundering. In the energy management device 21 according to the first embodiment, electric laundering can be suppressed.

  FIG. 3 is a diagram illustrating the unit price of purchase by the electric power company according to the first embodiment. The unit price of purchase by the electric power company in FIG. 2 was constant regardless of the amount of power purchased. On the other hand, as shown in FIG. 3, the unit price of purchase by the electric power company according to the first embodiment is changed in stages according to the amount of power to be purchased.

  That is, the purchase unit price SP2 (27 yen / KWh) for the discharge amount larger than SQ1 which is a predetermined threshold among the accumulated discharge amount of the consumer is the purchase unit price SP1 for the discharge amount smaller than SQ1. It is set lower than (37 yen / KWh). Similarly, the purchase unit price SP3 (11 yen / KWh) by the electric company for the discharge amount larger than the predetermined threshold SQ2 among the accumulated discharge amount of the consumer is the purchase unit price for the discharge amount smaller than SQ2. It is set lower than SP2 (27 yen / KWh). The purchase unit price SP1 is set to a unit price corresponding to the purchase unit price SP in FIG. 2B or a unit price close to the purchase unit price SP.

  In the first embodiment, SQ2 is set to the expected integrated discharge amount. That is, the control part 4b uses the discharge amount with respect to SQ2 (predetermined threshold value) as the expected integrated discharge amount. In the example of FIG. 3, the purchase unit prices SP1 and SP2 of the discharge amount smaller than the expected integrated discharge amount SQ2 out of the integrated discharge amount are higher than the sale unit price Pn of FIG. The purchase unit price SP3 of the discharge amount larger than the expected integrated discharge amount SQ2 is the same as the sale unit price Pn. However, the present invention is not limited to this, and the purchase unit price SP3 of the discharge amount larger than the expected integrated discharge amount SQ2 among the integrated discharge amount may be substantially the same as the sale unit price Pn or may be equal to or less than the sale unit price Pn. Good.

  In the above configuration, if the expected discharge amount (or the expected integrated discharge amount SQ2) is set to a value that allows a correctly operating consumer to obtain an appropriate profit by selling electricity, the consumer expects Even if the power amount exceeding the discharge amount (or the expected integrated discharge amount SQ2) is sold, it is impossible to substantially obtain a profit. Therefore, even if the consumer tries to sell the power stored from the system power supply 3 at midnight in addition to the power generated by the solar power generation device 1 during the daytime, it is profitable by selling the power stored at midnight. Can not be obtained substantially, so that electric laundering can be suppressed. Moreover, since it can suppress the power sale from the consumer exceeding the expected discharge amount (or the expected integrated discharge amount SQ2) from the viewpoint of the electric power company, in a predetermined period (here, one day), It becomes possible to purchase appropriate power stably.

  4-6 is a figure for demonstrating the power sale profit of the consumer by the energy management apparatus 21 which concerns on this Embodiment 1. FIG. In addition, in view of the fact that the amount of power generated by the solar power generation device 1 is discharged to the system power supply 3 as the discharge amount of discharge power, in the following description, the power generation amount of the solar power generation device 1 is defined as solar power generation. It may be described as the discharge amount of the device 1.

  FIG. 4 shows a case where there are many sunny days during the day. 4A is a diagram showing the relationship between the discharge amount and time of the photovoltaic power generation apparatus 1, and FIG. 4B is a diagram showing the relationship between the integrated discharge amount and time, and FIG. (c) is a figure for demonstrating the profit which a consumer can obtain by power sale.

  The solar discharge amount 101 shown in FIG. 4A is the discharge amount of the discharge power corresponding to the actual generated power in the solar power generation device 1 (the discharge amount from which the power consumption of the load 7 has already been removed). . That is, the amount of solar discharge 101 is the amount of power resulting from the generated power of the solar power generation device 1 among the amount of power sold by the customer to the electric utility.

  The expected discharge amount 102 shown in FIG. 4A is set to a discharge amount that is expected to be able to obtain an appropriate profit when a consumer who operates correctly sells power to an electric power company. Here, the expected discharge amount 102 is defined by a function having time as a parameter.

  4 (b), the accumulated solar discharge amount by time (integrated first electric power by time point) 103 is obtained by changing the solar discharge amount 101 of FIG. 4 (a) to a predetermined first period (here, one). The second period (here, the period from 0 o'clock to an arbitrary time point t) included in the date is obtained by integrating. The solar integrated discharge amount 103a shown in FIG. 4B is obtained by integrating the solar discharge amount 101 of FIG. 4A for one day. That is, the solar integrated discharge amount 103a corresponds to the time-based solar integrated discharge amount 103 when the time point t is 24:00, and corresponds to the SQDs in FIG. The unit of time t is not limited to time.

  The expected cumulative discharge amount 104 for each time point shown in FIG. 4B is the second period (here, the expected discharge amount 102 in FIG. 4A) included in a predetermined first period (here, one day). Then, it is obtained by integrating over a period from 0 o'clock to an arbitrary time t. The expected integrated discharge amount 104a shown in FIG. 4B is obtained by integrating the expected discharge amount 102 of FIG. 4A for one day. That is, the expected integrated discharge amount 104a corresponds to the expected integrated discharge amount 104 by time when the time t is 24:00, and corresponds to SQ2 in FIG. It should be noted that the integrated amounts such as the time-based solar integrated discharge amount 103, the solar integrated discharge amount 103a, the time-based expected integrated discharge amount 104, and the expected integrated discharge amount 104a are reset every day.

  Next, as shown in FIG. 4B, when the solar integrated discharge amount 103a (= SQDs) is larger than the expected integrated discharge amount 104a (= SQ2), the consumer sells the solar integrated discharge amount 103a. The benefits that can be obtained by doing this will be described with reference to FIG.

  The profit SPQs that can be obtained by the consumer selling the accumulated solar discharge amount 103a (= SQDs) corresponds to the area in the range indicated by hatching in FIG. Is calculated by

  As a result, the daily power sales profit for the consumer is SP1 × SQDs in the electricity charge of FIG. 2, whereas in the first embodiment, the power sales profit is shown in FIG. The profit is reduced by the profit mSPQs corresponding to the area in the range indicated by the hatching of the fine points. The profit mSPQs is calculated by the following equation (2).

  In the above-described example, the expected discharge amount (or the expected integrated discharge amount SQ2) is set so that a consumer who operates correctly can obtain an appropriate profit by selling power. For this reason, even if a consumer tries to sell power that is greater than or equal to the expected integrated discharge amount SQ2, the unit price is the same as the unit price for purchasing power from an electric power company at midnight. You will not be able to profit. As a result, suppression of electric laundering can be expected, and from the viewpoint of an electric power company, it is possible to stably purchase electric power of the expected integrated discharge amount SQ2 regardless of the weather.

  In addition, when the sunlight integrated discharge amount 103a exceeds the expected integrated discharge amount SQ2 as illustrated in FIG. 4, the control unit 4b uses surplus power other than the power consumption of the load 7 among the generated power of the solar power generation device 1. The power storage device 2 may store power. Further, in this case, if the power storage device 2 is already fully charged (if it is fully charged), the control unit 4b sells (discharges) power to the system power supply 3 although the purchase unit price is SP3 which is inexpensive. May be.

  FIG. 5 shows a case where there is a lot of time such as rain or cloudy during the day.

  FIG. 5A corresponds to FIG. 4A, and the solar discharge amount 105 and the expected discharge amount 106 in FIG. 5A are the solar discharge amount 101 and the expected discharge amount in FIG. 102 respectively. In FIG. 4 (a) where there are many sunny days during the day, there are many times when the solar discharge amount 101 exceeds the expected discharge amount 102, but there are many times such as rain and cloudy days during the day. Then, the time when the solar light discharge amount 101 falls below the expected discharge amount 102 increases.

  FIG. 5 (b) corresponds to FIG. 4 (b), and the time-dependent solar integrated discharge amount 107 and the solar integrated discharge amount 107a in FIG. 5 (b) are the time-dependent solar light in FIG. 4 (b). This corresponds to the integrated discharge amount 103 and the solar integrated discharge amount 103a, respectively. Moreover, the expected integrated discharge amount 108 and the expected integrated discharge amount 108a by time in FIG. 5B correspond to the expected integrated discharge amount 104 and the expected integrated discharge amount 104a by time in FIG. 4B, respectively. In FIG. 4B, the solar integrated discharge amount 103a (= SQDs) is larger than the expected integrated discharge amount 104a (= SQ2), but in FIG. 5B, the solar integrated discharge amount 107a (= SQDr). ) Is smaller than the expected integrated discharge amount 108a (= SQ2).

  Next, as shown in FIG. 5B, when the solar integrated discharge amount 107a (= SQDr) is smaller than the expected integrated discharge amount 108a (= SQ2), the consumer sells the solar integrated discharge amount 107a. The benefits that can be obtained by doing this will be described with reference to FIG.

  FIG. 5C corresponds to FIG. The profit SPQr that can be obtained by the consumer selling the accumulated solar discharge amount 107a (= SQDr) is shown in FIG. 5 (c) when the accumulated solar discharge amount 107a (= SQDr) is smaller than SQ1. ) And is calculated by the following equation (3). As can be seen from FIG. 5 (c), when there are many sunny days during the day (FIG. 4 (c)), the profit of SPQs can be expected, but when there are many rainy and cloudy hours during the day. May only gain profit SPQr.

  In this case, the profit mSPQr obtained by subtracting the actual profit SPQr that the consumer can obtain by selling power from the profit desired for the consumer corresponds to the area in the range indicated by the hatching of fine points in FIG. To do. This profit mSPQr is calculated by the following equation (4), for example.

  As described above, in the power generation pattern shown in FIG. 5, although the consumer can sell power at the unit price SP1 or the unit price SP2 higher than the unit price SP3, the generated power that can be sold is small. The profit mSPQr is not obtained, and as a result, the profit desirable for the consumer cannot be obtained. On the other hand, even in the case of FIG. 5, the energy management device 21 (control unit 4 b) according to the first embodiment achieves the power storage device discharge of the power storage device 2 so as to realize a desirable profit for the consumer. Electric power is discharged.

  FIG. 6 shows a case where the amount of power generated by the power storage device 2 is added to the amount of power generated by the solar power generation device 1 under the same weather conditions as in FIG. Yes.

  FIG. 6A corresponds to FIG. 5A, and the solar discharge amount 109 and the expected discharge amount 110 in FIG. 6A are the solar discharge amount 105 and the expected discharge amount in FIG. 106, respectively.

  The power storage device discharge amount 111 corresponding to the shaded portion in FIG. 6A is a discharge amount corresponding to the discharge from the power storage device 2 of the customer. That is, the power storage device discharge amount 111 is the amount of power caused by the discharge from the power storage device 2 out of the amount of power sold by the consumer to the electric utility.

  The control unit 4b controls the power storage device discharge power of the power storage device 2 so that the power storage device discharge amount 111 becomes a value obtained by subtracting the solar light discharge amount 109 from the expected discharge amount 110. Thereby, the consumer can obtain a desired profit regardless of the weather. Further, from the viewpoint of the electric power company, it is possible to stably purchase power of the expected integrated discharge amount SQ2 regardless of the weather.

  FIG. 6B corresponds to FIG. 5B, and the time-dependent solar integrated discharge amount 112 and the solar integrated discharge amount 112a in FIG. The integrated discharge amount 107 and the solar integrated discharge amount 107a are the same. Moreover, the expected integrated discharge amount 113 and the expected integrated discharge amount 113a by time in FIG. 6B are the same as the expected integrated discharge amount 108 and the expected integrated discharge amount 108a by time in FIG. 5B, respectively.

  6B is a second period that is included in the predetermined first period (one day in this case) as the power storage apparatus discharge amount 111 of FIG. 6A. It is obtained by integrating for (here, the period from 0:00 to an arbitrary time t). The power storage device integrated discharge amount 114a shown in FIG. 6B is obtained by integrating the power storage device discharge amount 111 of FIG. 6A for one day. That is, the power storage device integrated discharge amount 114a corresponds to the time-specific power storage device integrated discharge amount 114 when the time point t is 24:00, and corresponds to SQDb in FIG.

  FIG. 6C corresponds to FIG. In the case of FIG. 6C as well, in the same way as in the case of FIG. 5C, the profit that the customer can obtain by selling the solar accumulated discharge amount 112a (= SQDr) is the profit SPQr. is there. However, in the case of FIG. 6 (c), the control unit 4b causes the power storage device 2 to discharge the power storage device discharge amount 111, so that the consumer can deal with the area in the range indicated by the hatched hatching in FIG. 6 (c). Desired benefit (SPQr + mSPQr) can be obtained.

  As described above, according to the energy management device 21 according to the first embodiment, the amount of electric power that the solar power generation device 1 cannot generate with respect to the expected integrated discharge amount 113a is calculated as the power storage device discharge power of the power storage device 2. Control to cover with. As a result, the consumer can stably obtain a desired profit regardless of the weather, and the electric utility can stably purchase almost constant power regardless of the weather.

<Modification>
In the first embodiment, the purchase unit price by the electric power company is changed according to the integrated discharge amount obtained by integrating the discharge power of the power conditioner unit 4a. However, even in such a system, if the accumulated discharge amount does not reach the expected accumulated discharge amount, if the consumer discharges the electricity stored in the electricity storage device 2 from the electricity storage device 2 at night when demand is low, a high purchase price Applies. In this case, it is considered that the electric power provider may not be able to purchase power from the consumer during a time zone (for example, during the daytime) when the power is desired to be purchased from the consumer.

  Therefore, for example, an Internet connection unit may be provided so as to receive time arbitrarily purchased from the electric power company and purchased by the electric power company. That is, the time zone in which the electric power company purchases the discharge power of the power conditioner unit 4a is arbitrarily limited, and the information on the time zone may be received. Accordingly, it is possible to increase the possibility that the power storage device discharge power is discharged from the power storage device 2 to the system power supply 3 in the time zone intended by the electric utility. Therefore, it is possible to facilitate power demand prediction by an electric power company, and as a result, stabilization of power supply and improvement of power generation efficiency can be expected.

<Embodiment 2>
The configuration of the energy management system according to Embodiment 2 of the present invention is the same as the configuration of Embodiment 1 (FIG. 1). Therefore, in the energy management system according to the second embodiment, the same or similar components as those described above are denoted by the same reference numerals, and different portions are mainly described.

  In the second embodiment, the control unit 4b controls the power measuring device 5 during a second period (here, a period from 0 o'clock to an arbitrary time point t) included in a predetermined first period (here, one day). The integrated discharge amount RQ (t) for each time is calculated by integrating the discharge power measured in step (b). When the calculated cumulative discharge amount RQ (t) for each time point exceeds the expected integrated discharge amount SQ2 obtained by integrating the expected discharge amount in the first period, the control unit 4b The surplus power (part of the power) other than the power consumed by the load 7 among the generated power of 1 is stored in the power storage device 2.

  FIG. 7 is a flowchart showing the operation of the energy management system according to the second embodiment.

  First, in step S1, the power measuring device 5 measures the discharge power discharged from the power conditioner unit 4a to the system power supply 3. The measured value of the power measuring device 5 is periodically read by the control unit 4b.

  In step S2, the control unit 4b calculates the integrated discharge amount RQ (t) for each time point by integrating the read discharge power.

  In step S3, the control unit 4b determines whether or not the time-based integrated discharge amount RQ (t) is smaller than the expected integrated discharge amount SQ2. When it is determined that the time-based integrated discharge amount RQ (t) is not smaller than the expected integrated discharge amount SQ2 (greater than or equal to the expected integrated discharge amount SQ2), the process proceeds to step S4. .

  In step S4, control unit 4b determines whether or not power storage device 2 is fully charged. If it is determined that the battery is not fully charged, the process proceeds to step S5. If it is determined that the battery is fully charged, the process proceeds to step S6.

  In step S <b> 5, the power conditioner unit 4 a stores, in the power storage device 2, surplus power other than the power consumed by the load 7 among the generated power of the solar power generation device 1 under the control of the control unit 4 b. The power stored in the power storage device 2 is discharged at a later date when the weather is bad and the expected integrated discharge amount SQ2 is insufficient. Thereby, the consumer can stably obtain a desired profit regardless of the weather. Then, it returns to step S1.

  In step S <b> 6, the control unit 4 b discharges surplus power other than the power consumption of the load 7 out of the generated power of the solar power generation device 1 to the system power supply 3. As a result, power is sold from the consumer to the electric power company at the unit price SP3. Then, it returns to step S1.

  When the process proceeds from step S3 to step S7, the control unit 4b calculates the expected integrated discharge amount HQ (t) for each time point by integrating the expected discharge amount as in step S2.

  In step S8, the control unit 4b determines whether or not the time-based integrated discharge amount RQ (t) is equal to or greater than the time-based expected integrated discharge amount HQ (t). If it is determined that the time-based integrated discharge amount RQ (t) is equal to or greater than the time-based expected integrated discharge amount HQ (t), the process proceeds to step S9. Otherwise, the process proceeds to step S10.

  In step S <b> 9, the control unit 4 b does not discharge the power storage device discharge power of the power storage device 2 to the system power supply 3, and supplies surplus power other than the power consumption of the load 7 among the generated power of the solar power generation device 1. 3 is discharged. Then, it returns to step S1.

  When the process proceeds from step S8 to step S10, the control unit 4b discharges the power storage device discharge power of the power storage device 2 to the system power source 3, and the power generation power of the solar power generation device 1 other than the power consumption of the load 7 The surplus power is discharged to the system power supply 3. Moreover, when the generated power of the solar power generation device 1 is small and there is no surplus power, only the power storage device discharge power of the power storage device 2 may be discharged to the system power supply 3. Then, it returns to step S1.

  Note that the operation of FIG. 7 is repeated, for example, at regular intervals. Thereby, the electric power stored in the power storage device 2 is appropriately added to the electric power generated by the solar power generation device 1 and discharged to the system power source 3 as discharge power, and the accumulated discharge amount RQ for each time point (T) becomes equal to the expected integrated discharge amount HQ (t) for each time point.

  According to the energy management device 21 according to the second embodiment as described above, it is possible to obtain desirable profits more stably without being influenced by the weather, and the electric utility is almost constant without being influenced by the weather. Can be purchased more stably.

<Embodiment 3>
The configuration of the energy management system according to Embodiment 3 of the present invention is the same as the configuration of Embodiment 1 (FIG. 1). Therefore, in the energy management system according to the third embodiment, the same or similar components as those described above are denoted by the same reference numerals, and different portions are mainly described.

  In this Embodiment 3, the control part 4b acquires the information of the power consumption of the load 7 from the distribution board 6, etc., and acquires the information of the generated power of the solar power generation device 1 from the power conditioner part 4a. Based on these pieces of information, the control unit 4b determines the generated power in the second period (here, the period from 0 o'clock to an arbitrary time point t) included in the predetermined first period (here, one day). Of these, by integrating the power other than the power consumption of the load 7, the above-mentioned solar integrated discharge amount SQ (t) for each time point is calculated. The controller 4b calculates the above-mentioned expected integrated discharge amount HQ (t) for each time point by integrating the expected discharge amount in the second period. Based on the time-dependent solar cumulative discharge amount SQ (t1) and the time-based expected integrated discharge amount HQ (t1), the control unit 4b stores the power storage device discharge power LQ ( t1) is controlled.

  FIG. 8 is a diagram for explaining the operation of the energy management system according to the third embodiment. In the example of FIG. 8, the amount of power generation of the solar power generation device 1 decreases due to cloudy or rainy weather from around 11:00 am, and the solar integrated discharge amount SQ by time with respect to the expected integrated discharge amount HQ (t1) by time at the time t1. It is assumed that the difference (= HQ (t1) −SQ (t1)) of (t1) is larger than the threshold value TH. In this case, power control device 4 (control unit 4b) controls power storage device discharge power LQ (t1) to be discharged from power storage device 2. At this time, the control unit 4b controls the power storage device discharge force LQ (t1) so that SQ (t1) + LQ (t1) approaches HQ (t) as much as possible within a range not exceeding the maximum discharge rating of the power storage device 2. To do. Note that the comparison between the difference (= HQ (t) −SQ (t)) and the threshold value TH is repeated, for example, at regular intervals.

  According to the energy management device 21 according to the third embodiment as described above, a desired profit can be obtained more stably without being influenced by the weather, and the electric power company is substantially constant without being influenced by the weather. Can be purchased more stably. In addition, an apparatus or system that can achieve the above effects can be realized without using a complicated apparatus or system that predicts power to be generated on the day using information such as weather forecast.

  It should be noted that the present invention can be freely combined with each embodiment and each modification within the scope of the invention, and each embodiment and each modification can be appropriately modified and omitted.

<Modification>
FIG. 9 is a block diagram showing a configuration of an energy management system according to this modification. Here, after the photovoltaic power generation apparatus 1 and its power conditioner unit 8 have already been arranged, a situation in which components are added so that the same operation as in the first to third embodiments can be performed. Is assumed.

  Specifically, the combining unit 4 c is connected to the output of the power conditioner unit 4 a of the power storage device 2 and the output of the power conditioner unit 8 of the solar power generation device 1, and these outputs are controlled by the control unit 4. Is synthesized. Such a combining unit 4c can be composed of, for example, a sensor unit (not shown) that measures each power and a switch unit (not shown) that can be switched between connection and disconnection.

  According to the present modified example configured as described above, the control unit 4b becomes the AC connection instead of the DC connection, and the control unit 4b determines the generated power of the photovoltaic power generation device 1 based on the predetermined expected integrated discharge amount. By controlling the power storage device discharge power, the power discharged from the power control device 4 to the system power supply 3 can be controlled. Therefore, it becomes possible to discharge power to the system power supply 3 more appropriately.

  DESCRIPTION OF SYMBOLS 1 Photovoltaic power generation device, 2 Power storage device, 3 system power supply, 4a Power conditioner part, 4b Control part, 5 Power measuring device, 21 Energy management device, 101, 105, 109 Solar discharge amount, 102, 106, 110 Expected discharge Amount, 103, 107, 112 Solar cumulative discharge amount by time, 103a, 107a, 112a Solar cumulative discharge amount, 104, 108, 113 Expected cumulative discharge amount by time, 104a, 108a, 113a Expected cumulative discharge amount, 111 Device discharge amount, 114 Power storage device integrated discharge amount by time, 114a Power storage device integrated discharge amount.

Claims (4)

DC / AC conversion is performed on the power obtained by adding the second power discharged from the power storage device to the first power generated from the natural energy in the power generation device, and the converted power is supplied to the load as power consumption. And a power conditioner section that can discharge to the power supply of an electric power company as discharge power,
A control unit that controls the discharge power of the power conditioner unit by controlling the second power based on a predetermined expected integrated discharge amount ;
Of the integrated discharge amount obtained by integrating the discharge power for a predetermined period, the unit price of purchase by the electric power company for a discharge amount larger than a predetermined threshold is greater than the predetermined threshold. Lower than the purchase unit price for a small discharge amount,
The controller is
The discharge amount for the predetermined threshold Ru used as the expected accumulated discharge amount, the energy management device. The energy management device according to claim 1 ,
An energy management device capable of receiving information on a time zone in which a time zone in which the electric power is purchased by the electric power company is arbitrarily limited. The energy management device according to claim 1 or 2 ,
A power measurement unit for measuring the discharge power of the power conditioner unit;
The controller is
The integrated discharge amount for each time point obtained by integrating the discharge power measured by the power measuring unit in a second period included in a predetermined first period integrates the expected discharge amount in the first period. An energy management device that stores, in the power storage device, a part of the power other than the power consumption in the first power when the expected integrated discharge amount obtained by this is exceeded. The energy management device according to claim 1 or 2 ,
The controller is
A first time-based integrated first electric power obtained by integrating electric power other than the consumed electric power among the first electric power generated by the power generation device in a second period included in a predetermined first period; An energy management device that controls the second power to be discharged from the power storage device based on an expected integrated discharge amount for each time point obtained by integrating the expected discharge amount for two periods.

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