JP5940263B2 - Power control apparatus and power control method - Google Patents

Description

  The present invention relates to a power control apparatus and a power control method for controlling power supply to a load provided in a consumer.

  2. Description of the Related Art In recent years, fuel cells and solar cells as auxiliary power sources for electric power systems (hereinafter referred to as “systems”) have become popular in electric power consumers (such as houses).

  A fuel cell is a power generation device that generates electricity by a chemical reaction between hydrogen extracted from natural gas or the like and oxygen in the air. There is also known a cogeneration system in which heat generated during power generation is converted into hot water by heat exchange and stored in a hot water storage tank, and the hot water stored in the hot water storage tank is used for hot water supply. Since the fuel cell can control the power generation amount, “load following control” that controls the power generation amount of the fuel cell so as to follow the load power amount of the load may be applied.

  A solar cell is a power generator that receives sunlight to generate power. The amount of power generated by a solar cell is left to nature. For this reason, in order to operate solar cells efficiently, “power generation amount prediction technology” that predicts the future power generation amount of solar cells based on the predicted amount of solar radiation, power generation characteristics of solar cells, installation conditions, etc. May be applied (see, for example, Patent Document 1).

JP 2003-18763 A

  By the way, considering the recent power situation such as large-scale power outages and electricity charges, or increasing environmental awareness, the use of solar cells and fuel cells in combination with solar cells and fuel cells is not dependent on the power from the grid. There is a need to cover all power consumption.

  However, although the fuel cell can follow the load, the power generation amount of the fuel cell cannot be increased rapidly due to the power generation principle of the fuel cell. For this reason, there is a problem that the power consumption of the load cannot be covered when the power consumption of the load increases rapidly and the amount of power generated by the solar cell is small.

  Moreover, even if the load power amount of the load is constant, there is a problem that the power consumption of the load cannot be covered when the power generation amount of the solar cell is rapidly reduced.

  Then, an object of this invention is to provide the power control apparatus and power control method which can cover the power consumption of load using a solar cell and a fuel cell together.

  In order to solve the above-described problems, the present invention has the following features.

  The power control device according to the present invention is characterized in that a power control device for supplying power to a load (for example, load 400) using a fuel cell unit (for example, SOFC unit 100) and a solar cell unit (for example, PV unit 200) in combination. (E.g., SOFC controller 140 or HEMS controller 510), and an acquisition unit (e.g., acquisition unit 141 or acquisition unit 511) that acquires a predicted solar cell power amount that is a predicted value of the future output power amount of the solar cell unit; And a control unit (for example, the control unit 142 or the control unit 512) that controls the output power amount of the fuel cell unit based on the predicted solar cell power amount.

  Another feature of the power control device according to the present invention is the above-described feature, wherein the acquisition unit further acquires a solar cell current power amount that is a measured value of the current output power amount of the solar cell unit, The gist of the invention is that the control unit controls the output power amount of the fuel cell unit based on a variation state of the solar cell predicted power amount with respect to the solar cell current power amount.

  In another aspect of the power control apparatus according to the present invention, in the above-described feature, the acquisition unit further acquires a load power amount that is a measurement value of the power amount consumed by the load. A target power amount setting unit (for example, the setting unit 142a or setting) that sets a power amount obtained by subtracting the current power amount of the solar cell from the load power amount as a fuel cell target power amount that is a target value of the output power amount of the fuel cell unit. 512a), the target power amount setting unit, when the solar cell predicted power amount decreases by a predetermined value or more with respect to the solar cell current power amount, from the load power amount to the solar cell current power amount The gist of the present invention is that a power amount larger than the power amount obtained by subtracting is set as the fuel cell target power amount.

  In another aspect of the power control apparatus according to the present invention, in the above-described feature, the acquisition unit further acquires a load power amount that is a measurement value of the power amount consumed by the load. A target power amount setting unit (for example, setting unit 142a or setting unit 512a) that sets a power amount equal to the load power amount as a fuel cell target power amount that is a target value of the output power amount of the fuel cell unit; The power amount setting unit sets a power amount larger than the load power amount as the fuel cell target power amount when the solar cell predicted power amount decreases by a predetermined value or more with respect to the solar cell current power amount. This is the gist.

  Another feature of the power control device according to the present invention is that, in the above-described feature, the acquisition unit further acquires a solar cell past power generation amount that is a measurement value of the past power generation amount of the solar cell, and the control unit Is a target power amount setting unit that sets a fuel cell target power amount that is a target value of the output power amount of the fuel cell unit so as to compensate for the fluctuation of the solar cell current power amount with respect to the solar cell past power generation amount ( For example, the target power amount setting unit includes the setting unit 142a or the setting unit 512a), and the target power amount setting unit has the solar cell current power amount even when the solar cell current power amount decreases with respect to the solar cell past power generation amount. On the other hand, when the solar cell predicted power amount increases, the gist is that the fuel cell target power amount is maintained without increasing.

  Another feature of the power control device according to the present invention is that in the above-described feature, the acquisition unit acquires the predicted solar cell power amount by time period, and the control unit has a large amount of predicted solar cell power. An upper limit power generation amount setting unit (for example, setting) that sets a fuel cell upper limit electric energy that is an upper limit value of the output electric energy of the fuel cell unit for each time period so as to limit an output electric energy of the fuel cell unit in a time zone Including the part 142a or the setting part 512a).

  A feature of the power control method according to the present invention is a power control method for supplying power to a load in combination with a fuel cell unit and a solar cell unit, the predicted value of the future output power amount of the solar cell unit And a step of controlling the output power amount of the fuel cell unit based on the predicted solar cell power amount.

  ADVANTAGE OF THE INVENTION According to this invention, the power control apparatus and power control method which can cover the power consumption of load using a solar cell and a fuel cell together can be provided.

It is a block diagram of the electric power control system which concerns on 1st and 2nd embodiment. It is a flowchart of the electric power control method which concerns on 1st Embodiment. It is a flowchart of the electric power control method which concerns on 2nd Embodiment. It is a block diagram of the power control system which concerns on 3rd and 4th embodiment. It is a flowchart of the electric power control method which concerns on 3rd Embodiment. It is a flowchart of the electric power control method which concerns on 4th Embodiment. It is a block diagram of the example of a change of the electric power supply system which concerns on 1st and 2nd embodiment. It is a block diagram of the example of a change of the electric power supply system which concerns on 3rd and 4th embodiment.

  The first to fourth embodiments of the present invention and other embodiments will be described with reference to the drawings. In the drawings according to the following embodiments, the same or similar parts are denoted by the same or similar reference numerals.

[First Embodiment]
FIG. 1 is a block diagram of a power control system according to the present embodiment. In the block diagrams according to the following embodiments, thick lines indicate power lines, and broken lines indicate communication lines. The communication line may be wireless.

  As shown in FIG. 1, the power control system according to the present embodiment includes a solid oxide fuel cell (SOFC) unit 100, a solar cell (PV) unit 200, a distribution board 300, one or more loads 400, and It has a residential energy management system (HEMS) 500. The power control system according to the present embodiment supplies power to the load 400 using the SOFC unit 100 and the PV unit 200 in combination. The SOFC unit 100, the PV unit 200, the distribution board 300, the load 400, and the HEMS 500 are provided in a consumer who receives supply of alternating current (AC) power from the grid 10 of the power company.

  In the present embodiment, basically, the output power amount of the SOFC unit 100 is controlled so that the sum of the output power amounts of the SOFC unit 100 and the PV unit 200 is equal to the power consumption amount of the load 400. That is, power input / output is not performed between the customer and the grid 10. The case where power is input from the grid 10 to the consumer means power purchase from the power company, and the case where power is output (reverse power flow) from the consumer to the grid 10 is the sale of power to the power company. Means. Control to prevent power input / output between the customer and the grid 10 is performed when the power selling fee is less than or equal to the power purchase fee, when reverse power flow is prohibited, or when the grid 10 is blacked out. Is effective.

  The SOFC unit 100 includes an SOFC 110, an SOFC power conditioner (PCS) 120, and an SOFC controller 140.

  The SOFC 110 is a type of fuel cell, and generates power by a chemical reaction between hydrogen extracted from natural gas or the like and oxygen in the air, and outputs generated direct current (DC) power. The power generation amount of the SOFC 110 changes according to the amounts of gas and air input to the SOFC 110. The amount of gas and air is controlled by the SOFC controller 140.

  The SOFC PCS 120 receives DC power output from the SOFC 110, converts the input DC power into AC power, and outputs the AC power to the distribution board 300 via the SOFC power line 12.

  The SOFC controller 140 controls various functions of the SOFC unit 100. In the present embodiment, the SOFC controller 140 includes an acquisition unit 141 and a control unit 142.

  The acquisition unit 141 acquires various types of information from the measurement unit 310 provided in the distribution board 300 and the HEMS 500 provided in the consumer. In the present embodiment, the acquisition unit 141 includes a “load power amount” that is a measurement value of the power amount consumed by the load 400 at the current time and a “PV current power” that is a measurement value of the current output power amount of the PV unit 200. Amount ”is acquired from the measurement unit 310. In addition, the acquisition unit 141 acquires “PV predicted power amount” that is a predicted value of the output power amount of the PV unit 200 in the future from the HEMS 500.

  The control unit 142 controls the output power amount of the SOFC unit 100 based on the information acquired by the acquisition unit 141. In the present embodiment, the control unit 142 sets a setting unit 142a that sets a power amount obtained by subtracting the PV current power amount from the load power amount as a “SOFC target power amount” that is a target value of the output power amount of the SOFC unit 100. Including. The control unit 142 controls the SOFC 110 and the SOFC PCS 120 so that the output power amount of the SOFC unit 100 becomes the SOFC target power amount.

  When the PV predicted power amount decreases by a predetermined value or more with respect to the PV current power amount, the setting unit 142a sets the power amount larger than the power amount obtained by subtracting the PV current power amount from the load power amount, as the SOFC target power amount. Set as. Here, the predetermined value is a value corresponding to the upper limit of the output power amount that can be increased by the SOFC unit 100 per unit time (hereinafter, “SOFC power increase upper limit speed”). Therefore, in the future, when the PV predicted power amount decreases (rapidly) faster than the SOFC power increase upper limit speed with respect to the PV current power amount in the future, the setting unit 142a causes the SOFC unit 100 to perform the rapid decrease. Assuming that the tracking cannot be performed, the power amount larger than the SOFC target power amount that should be originally set is set as the SOFC target power amount.

  The PV unit 200 includes a PV 210 and a PV PCS 220.

  The PV 210 receives sunlight and generates power, and outputs the generated DC power. The amount of power generated by the PV 210 changes according to the amount of solar radiation irradiated on the PV 210.

  The PV PCS 220 receives DC power output from the PV 210, converts the input DC power into AC power, and outputs the AC power to the distribution board 300 via the PV power line 13.

  The distribution board 300 is connected to the system power line 11, the SOFC power line 12, the PV power line 13, and the load power line 14. The distribution board 300 distributes the output power (AC power) of each of the SOFC unit 100 and the PV unit 200 to the load 400, and distributes the AC power from the system 10 to the load 400.

  The distribution board 300 includes a measurement unit 310 that periodically measures the load power amount and the PV current power amount. The measurement unit 310 outputs the measured load power amount and PV current power amount to the SOFC controller 140 via a communication line with the SOFC controller 140. Note that the load power amount and the PV current power amount are not limited to being directly transmitted from the measurement unit 310 to the SOFC controller 140, but may be indirectly transmitted from the measurement unit 310 to the SOFC controller 140 via the HEMS 500. Good.

  The load 400 is connected to the load power line 14. The load 400 receives AC power via the load power line 14 and operates by consuming the input AC power. The load 400 is, for example, lighting or home appliances such as an air conditioner, a refrigerator, and a television.

  HEMS500 is for managing the electric power in a consumer. The HEMS 500 manages and displays the power consumption amount of the load 400 and performs control for power saving on the load 400. In the present embodiment, the HEMS 500 acquires the solar radiation amount information related to the solar radiation amount in the area to which the customer belongs from a server (not shown) provided in a network (such as the Internet) outside the consumer, and the solar radiation amount information. Based on the above, the PV predicted power amount is periodically acquired. Then, the HEMS 500 outputs the PV predicted power amount to the SOFC controller 140 via a communication line with the SOFC controller 140.

  Next, the power control method according to this embodiment will be described. FIG. 2 is a flowchart of the power control method according to the present embodiment. The SOFC controller 140 periodically executes this flow.

  As illustrated in FIG. 2, in step S101, the acquisition unit 141 acquires the load power amount and the PV current power amount from the measurement unit 310, and acquires the PV predicted power amount from the HEMS 500. The acquisition unit 141 outputs the acquired load power amount, PV current power amount, and PV predicted power amount to the control unit 142.

  In step S102, the setting unit 142a of the control unit 142 calculates a power amount obtained by subtracting the PV current power amount from the load power amount as a current shortage power amount.

  In step S103, the setting unit 142a determines the PV for the PV current power based on the time difference between the PV current power and the PV predicted power and the difference between the PV current power and the PV predicted power. Calculate the fluctuation speed (predicted fluctuation speed) of the predicted power amount, and based on the predicted fluctuation speed, whether or not the PV output power amount will decrease (rapidly) faster than the SOFC power increase upper limit speed in the future. judge.

  When the PV predicted power amount does not decrease (rapidly) faster than the SOFC power increase upper limit speed with respect to the PV current power amount (step S103; NO), in step S104, the setting unit 142a calculates the shortage calculated in step S102. A power amount equal to the power amount is set as the SOFC target power amount.

  On the other hand, when the PV predicted power amount decreases more rapidly (rapidly) than the SOFC power increase upper limit speed with respect to the PV current power amount (step S103; YES), in step S105, the setting unit 142a sets the step S102 to step S102. The amount of power larger than the amount of power shortage calculated in step (current power shortage + α) is set as the SOFC target power amount. That is, the power is generated by a larger amount by α.

  As described above, the SOFC controller 140 according to this embodiment sets the power amount obtained by subtracting the PV current power amount from the load power amount (current shortage power amount) as the SOFC target power amount. Thereby, when the output power amount of the PV unit 200 does not decrease rapidly, the power consumption amount of the load 400 can be covered by the respective output power amounts of the SOFC unit 100 and the PV unit 200. In other words, the output power amounts of the SOFC unit 100 and the PV unit 200 can follow the power consumption amount of the load 400.

  On the other hand, when the PV predicted power amount decreases with respect to the PV current power amount at a higher speed (abruptly) than the SOFC power increase upper limit speed, that is, the PV predicted power amount decreases with respect to the PV current power amount. In the case of decreasing beyond the load following performance, the SOFC controller 140 corrects and sets the SOFC target power amount to be larger than the current shortage power amount. As a result, when the output power amount of the PV unit 200 is predicted to decrease sharply in the future, the SOFC unit 100 and the SOFC unit 100 and the The power consumption amount of the load 400 can be covered by the output power amount of each PV unit 200.

[Second Embodiment]
Hereinafter, the difference between the second embodiment and the above-described embodiment will be mainly described.

  The power supply system according to the present embodiment is configured similarly to the first embodiment, but the power control method is different from that of the first embodiment. In the present embodiment, basically, the output power amount of the SOFC unit 100 is controlled so that the output power amount of the SOFC unit 100 becomes equal to the power consumption amount of the load 400. That is, control is performed so that all the output power of the PV unit 200 is reversely flowed (purchased) into the grid 10. Such control is effective when, for example, reverse power flow of the output power of the SOFC unit 100 is prohibited, and when the power sale fee is higher than the power purchase fee.

  Next, the power control method according to this embodiment will be described. FIG. 3 is a flowchart of the power control method according to the present embodiment. The SOFC controller 140 periodically executes this flow.

  As illustrated in FIG. 3, in step S201, the acquisition unit 141 acquires the load power amount and the PV current power amount from the measurement unit 310, and acquires the PV predicted power amount from the HEMS 500. The acquisition unit 141 outputs the acquired load power amount, PV current power amount, and PV predicted power amount to the control unit 142.

  In step S202, the setting unit 142a of the control unit 142 determines whether or not the PV predicted power amount is decreased (rapidly) faster than the SOFC power increase upper limit speed with respect to the PV current power amount. Specifically, the setting unit 142a determines the PV for the PV current power based on the time difference between the PV current power and the PV predicted power and the difference between the PV current power and the PV predicted power. Calculate the fluctuation speed (predicted fluctuation speed) of the predicted power amount, and based on the predicted fluctuation speed, whether or not the PV output power amount will decrease (rapidly) faster than the SOFC power increase upper limit speed in the future. judge.

  When the PV predicted power amount does not decrease (rapidly) faster than the SOFC power increase upper limit speed with respect to the PV current power amount (step S202; NO), in step S203, the setting unit 142a sets the power equal to the load power amount. The amount is set as the SOFC target power amount.

  On the other hand, when the PV predicted power amount decreases (rapidly) faster than the SOFC power increase upper limit speed with respect to the PV current power amount (step S202; YES), in step S204, the setting unit 142a sets the load power The amount of power larger than the amount (load power amount + α) is set as the SOFC target power amount. That is, the power is generated by a larger amount by α.

  As described above, the SOFC controller 140 according to the present embodiment normally sets the power amount equal to the load power amount as the SOFC target power amount. However, when the PV predicted power amount decreases with respect to the PV current power amount faster (rapidly) than the SOFC power increase upper limit speed, that is, the PV predicted power amount is the load of the SOFC unit 100 with respect to the PV current power amount. In the case of a decrease beyond the tracking performance, the SOFC controller 140 corrects and sets the SOFC target power amount more than usual.

  As a result, when the output power amount of the PV unit 200 is predicted to rapidly decrease in the future, the SOFC target power amount of the SOFC unit 100 is increased by increasing the SOFC target power amount in advance in preparation for the rapid decrease. The amount of power consumed by the load 400 can be covered by the amount of output power. As a result, it is possible to avoid a situation where the output power amount of the SOFC unit 100 is insufficient with respect to the load power amount. Therefore, the load 400 consumes the output power of the PV unit 200 or purchases power from the grid 10. It can be avoided.

[Third Embodiment]
Hereinafter, a difference between the third embodiment and the above-described embodiment will be mainly described.

  FIG. 4 is a block diagram of the power control system according to the present embodiment. As shown in FIG. 4, the power control system according to this embodiment is different from the above-described embodiment in that it further includes a hot water storage unit 150. The power control system according to the present embodiment has a configuration (so-called cogeneration system) that converts heat generated during power generation (chemical reaction) in the SOFC unit 100 into hot water by heat exchange.

  The hot water storage unit 150 includes a hot water storage tank 151 connected to a heat exchanger 130 provided in the SOFC unit 100. The SOFC controller 140 is configured to stop power generation when detecting that the hot water in the hot water storage tank 151 is full. About another structure, it is the same as that of 1st Embodiment.

  In the present embodiment, the SOFC controller 140 basically controls the output power amount of the SOFC unit 100 so that the sum of the output power amounts of the SOFC unit 100 and the PV unit 200 becomes a constant amount. Specifically, the setting unit 142a of the SOFC controller 140 sets the SOFC target power amount so as to compensate for the fluctuation of the PV current power amount with respect to the PV past power amount.

  Next, the power control method according to this embodiment will be described. FIG. 5 is a flowchart of the power control method according to the present embodiment. The SOFC controller 140 periodically executes this flow.

  As illustrated in FIG. 5, in step S301, the acquisition unit 141 acquires the PV current power amount from the measurement unit 310, and acquires the PV predicted power amount from the HEMS 500. Moreover, the acquisition unit 141 acquires the PV current power amount acquired last time as “PV past power amount” again. The PV past power amount is stored in a memory (not shown) provided in the SOFC controller 140, for example. The acquisition unit 141 outputs the acquired PV current power amount, PV predicted power amount, and PV past power amount to the control unit 142.

  In step S <b> 302, the setting unit 142 a of the control unit 142 calculates the fluctuation amount of the PV current power amount with respect to the PV past power amount as “PV power fluctuation amount”.

  In step S303, the setting unit 142a determines whether or not the PV current power amount has decreased with respect to the PV past power amount.

  If the PV current power amount has not decreased with respect to the PV past power amount (step S303; NO), in step S304, the setting unit 142a sets the SOFC target power amount so as to compensate for the PV power fluctuation amount calculated in step S302. Set. For example, when the PV current power amount has increased by X [W] relative to the PV past power amount, the SOFC target power amount is obtained by subtracting X [W] from the previous value as the SOFC target power amount. .

  On the other hand, when the PV current power amount decreases with respect to the PV past power amount (step S303; YES), in step S305, the setting unit 142a increases the PV predicted power amount with respect to the PV current power amount. It is determined whether or not to do.

  When the PV predicted power amount does not increase with respect to the PV current power amount (step S305; NO), in step S304, the setting unit 142a sets the SOFC target power amount so as to supplement the PV power fluctuation amount calculated in step S302. To do. For example, when the PV current power amount is reduced by Y [W] with respect to the PV past power amount, the SOFC target power amount obtained by adding Y [W] to the previous value is set as the SOFC target power amount. And

  On the other hand, when the PV predicted power amount increases with respect to the PV current power amount (step S305; YES), in step S306, the setting unit 142a maintains the SOFC target power amount without changing from the previous value. .

  As described above, the SOFC controller 140 according to the present embodiment increases the PV predicted power amount with respect to the PV current power amount even when the PV current power amount decreases with respect to the PV past power amount. In this case, the SOFC target power amount is maintained without increasing. Thus, when it is predicted that the output power amount of the PV unit 200 will increase in the future, the hot water amount of the hot water storage tank 151 is not increased more than necessary by maintaining the SOFC target power amount without increasing it. The possibility that the hot water in the hot water storage tank 151 becomes full can be reduced. As a result, power generation can be performed while increasing the amount of hot water when necessary.

[Fourth Embodiment]
Hereinafter, a difference between the fourth embodiment and the above-described embodiment will be mainly described.

  The power supply system according to the present embodiment is configured in the same manner as in the third embodiment, but the power control method is different from that in the third embodiment. In the present embodiment, the SOFC controller 140 is configured to determine the power generation schedule of the SOFC unit 100 based on the PV predicted power amount for each time zone.

  Next, the power control method according to this embodiment will be described. FIG. 6 is a flowchart of the power control method according to the present embodiment. The SOFC controller 140 periodically executes this flow.

  In step S <b> 401, the acquisition unit 141 acquires the PV predicted power amount for each time zone from the HEMS 500. The acquisition unit 141 outputs the acquired PV predicted power amount for each time zone to the control unit 142.

  In step S402, the setting unit 142a of the control unit 142 identifies a time zone with a large PV predicted power amount based on the PV predicted power amount for each time zone. The time zone in which the PV predicted power amount is large means a time zone in which the PV predicted power amount is larger than a predetermined threshold or a time zone in which the PV predicted power amount is relatively larger than other time zones.

  In step S403, the setting unit 142a sets the SOFC upper limit power amount that is the upper limit value of the output power amount of the SOFC unit 100 for a time zone in which the PV predicted power amount is large. Thereafter, the setting unit 142a sets the SOFC target power amount within a range in which the SOFC upper limit power amount is not exceeded in the time zone in which the SOFC upper limit power amount is set.

  As described above, the SOFC controller 140 according to the present embodiment acquires the PV predicted power amount for each time zone, and the control unit 512 limits the output power amount of the SOFC unit 100 in the time zone when the PV predicted power amount is large. Thus, the SOFC upper limit power amount that is the upper limit value of the output power amount of the SOFC unit 100 is set for each time period. Thus, in the time zone in which the output power amount of the PV unit 200 is predicted to increase, the output power amount of the PV unit 200 is predicted to decrease by not increasing the hot water amount in the hot water storage tank 151 more than necessary. Thus, the amount of hot water in the hot water storage tank 151 can be kept small. As a result, the output power amount of the SOFC unit 100 can be increased in a time zone in which the output power amount of the PV unit 200 is expected to decrease, and power generation can be performed while increasing the hot water amount when necessary.

[Other Embodiments]
As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In each of the above-described embodiments, the SOFC controller 140 implements the power control method according to the present invention, that is, the SOFC controller 140 as an example of the power control device according to the present invention has been described. HEMS500 may implement.

  FIG. 7 is a block diagram of a modified example of the power supply system according to the first and second embodiments described above. As shown in FIG. 7, the HEMS 500 includes a HEMS controller 510 that controls various functions of the HEMS 500. The HEMS controller 510 includes an acquisition unit 511 and a control unit 512.

  The acquisition unit 511 acquires the load power amount and the PV current power amount from the measurement unit 310. Moreover, the acquisition part 511 acquires the solar radiation amount information regarding the solar radiation amount of the said consumer's area from the server (not shown) provided in the network (Internet etc.) outside a consumer, and based on the said solar radiation amount information To obtain the PV predicted power amount.

  The control unit 512 controls the output power amount of the SOFC unit 100 based on the information acquired by the acquisition unit 511. The control unit 512 includes a setting unit 142a that sets the SOFC target power amount. The setting unit 142a sets the SOFC target power amount in the SOFC controller 140 according to the power control method described in the first embodiment or the second embodiment.

  FIG. 8 is a block diagram of a modified example of the power supply system according to the third and fourth embodiments described above. This modification is different from FIG. 7 in that a hot water storage unit 150 is added. The setting unit 142a sets the SOFC target power amount in the SOFC controller 140 according to the power control method described in the third embodiment or the fourth embodiment.

  Thus, it should be understood that the present invention includes various embodiments and the like not described herein.

  DESCRIPTION OF SYMBOLS 10 ... Grid, 11 ... Grid power line, 12 ... SOFC power line, 13 ... PV power line, 14 ... Load power line, 100 ... SOFC unit, 110 ... SOFC, 120 ... SOFC PCS, 130 ... Heat exchanger, 140 ... SOFC controller 141 ... acquisition unit 142 ... control unit 142a ... setting unit 150 ... hot water storage unit 151 ... hot water storage tank 200 ... PV unit 210 ... PV 220 ... PV PCS 300 ... distribution panel 310 ... Measurement unit, 400 ... load, 500 ... HEMS, 510 ... HEMS controller, 511 ... acquisition unit, 512 ... control unit, 512a ... setting unit

Claims (4)

A power control device for supplying power to a load using a fuel cell unit and a solar cell unit in combination,
An acquisition unit that acquires a solar cell current power amount that is a measured value of the current output power amount of the solar cell unit and a solar cell predicted power amount that is a predicted value of the future output power amount of the solar cell unit;
In the case where reverse power flow to the system is prohibited, when the reduction rate of the solar cell predicted amount of power against the solar cell current amount of power is less than the predetermined speed, the measurement of the amount of power the load consumes A first electric energy obtained by subtracting the current electric energy of the solar cell from the load electric energy that is a value as a fuel cell target electric energy, the output electric energy of the fuel cell unit at the present time is controlled, and the current electric energy of the solar cell is When the decrease rate of the predicted solar cell power amount is equal to or higher than the predetermined rate , the output power amount of the fuel cell unit at the present time is set to a power amount larger than the first power amount as the fuel cell target power amount. And a control unit that controls the power control apparatus. The acquisition unit acquires a solar cell past power generation amount that is a measurement value of a past power generation amount of the solar cell unit,
The control unit sets the fuel cell target power amount so as to compensate for the fluctuation of the solar cell current power amount with respect to the solar cell past power generation amount,
When the solar cell predicted power amount increases with respect to the solar cell current power amount, the control unit may increase the solar cell current power amount with respect to the solar cell past power generation amount. Maintaining the fuel cell target power without increasing it,
The power control apparatus according to claim 1. The acquisition unit acquires the solar cell predicted electric energy for each time zone,
The control unit sets a fuel cell upper limit electric energy that is an upper limit value of the output electric energy of the fuel cell unit so as to limit the output electric energy of the fuel cell unit in the time period when the predicted electric energy of the solar cell is large. Set by the time zone,
The power control apparatus according to claim 1. A power control method for supplying power to a load using a fuel cell unit and a solar cell unit in combination,
Obtaining a solar cell current power amount that is a measured value of the current output power amount of the solar cell unit and a solar cell predicted power amount that is a predicted value of the future output power amount of the solar cell unit;
In the case where reverse power flow to the system is prohibited, when the reduction rate of the solar cell predicted amount of power against the solar cell current amount of power is less than the predetermined speed, the measurement of the amount of power the load consumes A first electric energy obtained by subtracting the current electric energy of the solar cell from the load electric energy that is a value as a fuel cell target electric energy, the output electric energy of the fuel cell unit at the present time is controlled, and the current electric energy of the solar cell is When the decrease rate of the predicted solar cell power amount is equal to or higher than the predetermined rate , the output power amount of the fuel cell unit at the present time is set to a power amount larger than the first power amount as the fuel cell target power amount. A step of controlling
A power control method comprising:

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