Power control method

Abstract

When supplying power to the power load (40) of a power consumer from a distributed power system (10) including a distributed power generation device (31) and a power storage device (32), the power control method of the present disclosure determines the supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device (31) is greater than the required power of the power consumer.

Description

Technical Field

[0001] The present disclosure relates to a power control method, a power control device, and a distributed power system.

Background Art

[0002] Regarding the power control of a distributed power system, various proposals have been made conventionally. As an example, Patent Document 1 describes controlling the output of a fuel cell so as to match the difference between the demanded power and the output of a photovoltaic power generation device, and absorbing the excess or shortage of the supplied power with respect to the power demand due to the output fluctuation delay of the fuel cell by charging and discharging a storage battery.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to provide, as an example, a power control method, a power control device, and a distributed power system that can reduce the possibility of purchasing power from a power grid more than before.

Means for Solving the Problems

[0005] To solve the above problems, a power control method according to one aspect of the present disclosure determines the supplied power of the distributed power generation device using a first coefficient such that the supplied power of the distributed power generation device becomes greater than the demanded power of the power consumer when supplying power to the power load of the power consumer from a distributed power system including the distributed power generation device and the power storage device.

[0006] A power control device according to an aspect of the present disclosure includes a memory that stores the power demand of a power consumer, and a controller that determines the power supplied by the distributed power generation device using a first coefficient so that the power supplied by the distributed power generation device is greater than the power demand of the power consumer when supplying power to the power load of the power consumer from a distributed power system including the distributed power generation device and the energy storage device.

[0007] A distributed power system according to an aspect of the present disclosure includes a distributed power generation device, an energy storage device, and the above-described power control device.

Advantages of the Invention

[0008] A power control method, a power control device, and a distributed power system according to an aspect of the present disclosure have an effect of being able to reduce the possibility of power purchase from the power grid more than before.

Brief Description of the Drawings

[0009]

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Mode for Carrying Out the Invention

[0010] In paragraph

[0038] of Patent Document 1, when the generated power becomes insufficient due to an increase in load or a decrease in generated power, a control command is issued to increase the fuel cell output until the required fuel cell output current calculated from the solar cell output current and the load current, and since there is a time delay until the actual output increases, power control for discharging from the power storage device is disclosed.

[0011] However, the invention described in Patent Document 1 has not been sufficiently studied from the viewpoint of suppressing power purchase from the power grid. For example, when the power storage device is fully charged or in a state close thereto, power purchase from the power grid may occur due to the time delay in the output change of the fuel cell.

[0012] Therefore, when supplying power to the power load of a power consumer from a distributed power system including a distributed power generation device and a power storage device, the power control method according to the first aspect of the present disclosure determines the supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device becomes larger than the required power of the power consumer.

[0013] According to the above, the power control method of this aspect can reduce the possibility of power purchase from the power grid more than before.

[0014] Specifically, in the power control method of this aspect, although the possibility of reverse power flow into the power grid increases, this is tolerated, and the supply power of the distributed power generation device is determined using a first coefficient so that the supply power of the distributed power generation device is greater than the demand power of the power consumer. Thereby, compared with the case where the supply power of the distributed power generation device is not determined using the first coefficient, the power control method of this aspect can appropriately suppress the power purchase from the power grid by the distributed power system.

[0015] In the power control method of the second aspect of the present disclosure, in the power control method of the first aspect, the distributed power generation device includes a solar power generation device and a fuel cell device, and the planned power generation value of the fuel cell device may be determined so as to satisfy the difference between the value obtained by multiplying the predicted value or actual demand power of the power consumer by the first coefficient α and the predicted value or actual generated power of the solar power generation device.

[0016] The power generation power of the fuel cell device calculated from the difference between the value obtained by multiplying the predicted value or actual demand power of the power consumer by the first coefficient α and the predicted value or actual generated power of the solar power generation device (hereinafter referred to as the power generation power of this aspect) is greater than the power generation power of the fuel cell device calculated from the difference between the predicted value or actual demand power of the power consumer and the predicted value or actual generated power of the solar power generation device (hereinafter referred to as the power generation power of the comparative example).

[0017] Here, the "power generation power of the comparative example" corresponds to power that is less likely to induce power purchase from the power grid. That is, the "power generation power of this aspect" is power that is further increased using the first coefficient α from the power that is less likely to induce power purchase from the power grid.

[0018] Therefore, in the power control method of this aspect, the planned power generation of the fuel cell device is determined so as to satisfy the difference between the value obtained by multiplying the predicted or actual power demand of the power consumer by the first coefficient α and increasing it and the predicted or actual power generation of the photovoltaic power generation device. Thus, compared to the case where the planned power generation of the fuel cell device is determined without increasing the predicted or actual power demand of the power consumer, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0019] In the power control method of the third aspect of the present disclosure, in the power control method of the first aspect or the second aspect, the distributed power generation device includes a photovoltaic power generation device and a fuel cell device, and the planned power generation of the fuel cell device is multiplied by the first coefficient β and increased by adding a correction value of the planned value based on the actual power demand of the power consumer, the actual power generation of the photovoltaic power generation device, and the planned power generation of the fuel cell device. The value may be determined as the power generation of the fuel cell device.

[0020] When the distributed power generation device includes a photovoltaic power generation device and a fuel cell device, the value obtained by adding the correction value of the planned value to the planned power generation of the fuel cell device corresponds to the power generation of the fuel cell device that is less likely to induce power purchase from the power grid. That is, the value obtained by multiplying the sum of the planned value and the correction value of the planned value by the first coefficient β and increasing it is the power further increased using the first coefficient β from the power generation that is less likely to induce power purchase from the power grid.

[0021] Therefore, in the power control method of this aspect, by determining the power generation of the fuel cell device as the value obtained by multiplying the value obtained by adding the correction value of the planned value to the planned power generation of the fuel cell device by the first coefficient β and increasing it, compared to the case where the power generation of the fuel cell device is determined without increasing the correction value, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0022] In the power control method according to the fourth aspect of the present disclosure, in the power control method according to the first aspect or the second aspect, the distributed power generation device includes a fuel cell device, and the planned power generation value of the fuel cell device is added with the actual demand power of the power consumer and a correction value of the planned power generation value based on the planned power generation value of the fuel cell device. The value obtained by multiplying the added value by the first coefficient β and increasing it may be determined as the power generation power of the fuel cell device.

[0023] When the distributed power generation device includes a fuel cell device, the value obtained by adding the correction value of the planned power generation value to the planned power generation value of the fuel cell device corresponds to the power generation power of the fuel cell device that is less likely to induce power purchase from the power grid. That is, the value obtained by multiplying the sum of the planned power generation value and the correction value of the planned power generation value by the first coefficient β and increasing it is the power further increased using the first coefficient β from the power generation power that is less likely to induce power purchase from the power grid.

[0024] Therefore, the power control method of this aspect determines the power generation power of the fuel cell device by multiplying the value obtained by adding the correction value of the planned power generation value to the planned power generation value of the fuel cell device by the first coefficient β and increasing it. Compared with the case where the power generation power of the fuel cell device is determined without multiplying by the first coefficient β, it is possible to appropriately suppress power purchase from the power grid by the distributed power system.

[0025] In the power control method according to the fifth aspect of the present disclosure, in the power control method according to the first aspect or the second aspect, the distributed power generation device includes a solar power generation device and a fuel cell device, and the value obtained by multiplying by the first coefficient γ and increasing it by the difference between the actual demand power of the power consumer and the sum of the chargeable power below the maximum charge power of the energy storage device and the actual power generation power of the fuel cell device may be determined as the upper limit value of the power generation of the solar power generation device.

[0026] When the distributed power generation device includes a solar power generation device and a fuel cell device, the value below the difference between the actual power demand of the power consumer and the sum of the chargeable power below the maximum charge power of the power storage device and the actual power generation power of the fuel cell device corresponds to the power generation power of the solar power generation device for which power purchase from the power grid is less likely to be induced. That is, the value increased by multiplying the value below the above difference by the first coefficient γ is the power further increased using the first coefficient β from the power generation power for which power purchase from the power grid is less likely to be induced.

[0027] Therefore, the power control method of this aspect determines the value increased by multiplying the value below the difference between the actual power demand of the power consumer and the sum of the chargeable power below the maximum charge power of the power storage device and the actual power generation power of the fuel cell device by the first coefficient γ as the power generation upper limit value of the solar power generation device. Thus, compared with the case where the power generation upper limit value of the solar power generation device is determined without increasing the value below the difference, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0028] The power control method according to the sixth aspect of the present disclosure may determine, in the power control method according to the first aspect or the second aspect, the value increased by multiplying the value below the sum of the actual power demand of the power consumer and the chargeable power below the maximum charge power of the power storage device by the first coefficient γ as the power generation upper limit value of the solar power generation device when the distributed power generation device includes a solar power generation device.

[0029] When the distributed power generation device includes a solar power generation device, the value below the sum of the actual power demand of the power consumer and the chargeable power below the maximum charge power of the power storage device corresponds to the power generation power of the solar power generation device for which power purchase from the power grid is less likely to be induced. That is, the value increased by multiplying the value below the above sum by the first coefficient γ is the power further increased using the first coefficient γ from the power generation power for which power purchase from the power grid is less likely to be induced.

[0030] Therefore, the power control method of this aspect determines the upper limit of power generation of the solar power generation device as a value increased by multiplying a value less than or equal to the sum of the actual power demand of the power consumer and the chargeable power below the maximum charge power of the energy storage device by the first coefficient γ. By doing so, compared with the case where the upper limit of power generation of the solar power generation device is determined without increasing the value less than or equal to the sum, the power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0031] In the power control method of the seventh aspect of the present disclosure, in the power control method of the first aspect or the second aspect, the distributed power generation device includes a solar power generation device and a fuel cell device, and a value increased by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device and the actual power generation of the fuel cell device by the second coefficient δ may be determined as the charge power or discharge power of the energy storage device.

[0032] When the distributed power generation device includes a solar power generation device and a fuel cell device, the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device and the actual power generation of the fuel cell device corresponds to the charge power or discharge power of the energy storage device that is less likely to induce power purchase from the power grid. That is, the value increased by multiplying the above difference by the second coefficient δ is the power further increased using the second coefficient δ from the power that is less likely to induce power purchase from the power grid.

[0033] Therefore, the power control method of this aspect determines the charge power or discharge power of the energy storage device as a value increased by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device and the actual power generation of the fuel cell device by the second coefficient δ. By doing so, compared with the case where the charge power or discharge power of the energy storage device is determined without increasing the difference, the power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0034] In the power control method according to the eighth aspect of the present disclosure, in the power control method according to the first aspect or the second aspect, the distributed power generation device includes a photovoltaic power generation device, and a value obtained by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the photovoltaic power generation device by a second coefficient δ may be determined as the charging power or the discharging power of the energy storage device.

[0035] When the distributed power generation device includes a photovoltaic power generation device, the difference between the actual power demand of the power consumer and the actual power generation of the photovoltaic power generation device corresponds to the charging power or the discharging power of the energy storage device in which power purchase from the power grid is hardly induced. That is, the value obtained by multiplying the above difference by the second coefficient δ is the power further increased using the second coefficient δ from the power in which power purchase from the power grid is hardly induced.

[0036] Therefore, the power control method of the present aspect determines the charging power or the discharging power of the energy storage device by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the photovoltaic power generation device by the second coefficient δ, so that compared with the case where the charging power or the discharging power of the energy storage device is determined without increasing the difference, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0037] In the power control method according to the ninth aspect of the present disclosure, in the power control method according to the first aspect or the second aspect, the distributed power generation device includes a fuel cell device, and a value obtained by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device by a second coefficient δ may be determined as the charging power or the discharging power of the energy storage device.

[0038] When the distributed power generation device includes a fuel cell device, the difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device corresponds to the charging power or the discharging power of the energy storage device in which power purchase from the power grid is hardly induced. That is, the value obtained by multiplying the above difference by the second coefficient δ is the power further increased using the second coefficient δ from the power in which power purchase from the power grid is hardly induced.

[0039] Therefore, the power control method of this aspect determines the charging power or discharging power of the energy storage device by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device by the second coefficient δ and increasing the resulting value. By doing so, compared with the case where the charging power or discharging power of the energy storage device is determined without increasing this difference, it is possible to appropriately suppress the power purchase from the power grid by the distributed power generation system.

[0040] In the power control method according to the tenth aspect of the present disclosure, in any one of the power control methods according to the first to sixth aspects, the first coefficient may vary according to the season.

[0041] Generally, the power generation of the solar power generation device and the power demand of the power consumer vary according to the season. Therefore, the power control method of this aspect can reduce the amount of power purchased from the power grid compared to the case where the first coefficient is constant for each season by setting the first coefficient to a desired value according to the season.

[0042] In the power control method according to the eleventh aspect of the present disclosure, in any one of the power control methods according to the seventh to ninth aspects, the second coefficient may vary according to the season.

[0043] Generally, the power generation of the solar power generation device and the power demand of the power consumer vary according to the season. Therefore, the power control method of this aspect can reduce the amount of power purchased from the power grid compared to the case where the second coefficient is constant for each season by setting the second coefficient to a desired value according to the season.

[0044] The power control method according to the 12th aspect of the present disclosure is the power control method according to the 1st aspect or the 2nd aspect, wherein the distributed power generation device includes a solar power generation device and a fuel cell device, and the planned power generation of the fuel cell device is added with the actual demand power of the power consumer, the actual power generation of the solar power generation device, and a correction value of the planned power generation value of the fuel cell device based on the planned power generation value of the fuel cell device. The first control determines the power generation of the fuel cell device by multiplying the added value by the first coefficient β to increase it, or the difference between the actual demand power of the power consumer and the sum of the actual power generation of the solar power generation device and the actual power generation of the fuel cell device is multiplied by the second coefficient δ to increase it. The second control determines the charging power or discharging power of the energy storage device, and the first coefficient β may be larger than the second coefficient δ.

[0045] As described above, in the power control method of this aspect, the first control is executed to determine the power generation of the fuel cell device by multiplying the added value of the planned power generation value of the fuel cell device by the first coefficient β. Compared with the case where the control for determining the power generation of the fuel cell device without multiplying by the first coefficient β is executed, the power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0046] Also, as described above, in the power control method of this aspect, the second control is executed to determine the charging power or discharging power of the energy storage device by multiplying the difference between the actual demand power of the power consumer and the sum of the actual power generation of the solar power generation device and the actual power generation of the fuel cell device by the second coefficient δ to increase it. Compared with the case where the control for determining the charging power or discharging power of the energy storage device without increasing the difference is executed, the power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0047] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing power purchase from the power grid in the former first control is likely to be greater than that in the latter second control. This is because, generally, most of the power demand of power consumers is met by the power supplied from distributed power generation devices, and the remaining part is met by the charging or discharging power of the energy storage device. As a result, the power generated by the fuel cell device tends to be greater than the charging or discharging power of the energy storage device.

[0048] Therefore, as in the power control method of this aspect, when the first coefficient β in the first control is made larger than the second coefficient δ in the second control, compared with the case where their magnitudes are equal or the magnitude relationship between them is reversed, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0049] The power control method according to the 13th aspect of the present disclosure is the power control method according to the 1st aspect or the 2nd aspect, in which the distributed power generation device includes a fuel cell device, and the planned power generation value of the fuel cell device is multiplied by the first coefficient β to increase the value obtained by adding the correction value of the planned value to the planned power generation value of the fuel cell device based on the actual power demand of the power consumer and the planned power generation value of the fuel cell device, and the value is determined as the power generation power of the fuel cell device in the first control, or the difference between the actual power demand of the power consumer and the actual power generation power of the fuel cell device is multiplied by the second coefficient δ to increase the value, and the value is determined as the charging or discharging power of the energy storage device in the second control, and the first coefficient β may be larger than the second coefficient δ.

[0050] As described above, in the power control method of this aspect, by executing the first control in which the value obtained by multiplying the value obtained by adding the correction value of the planned value to the planned power generation value of the fuel cell device by the first coefficient β is determined as the power generation power of the fuel cell device, compared with the case where the control for determining the power generation power of the fuel cell device without multiplying by the first coefficient β is executed, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0051] Further, as described above, the power control method of this aspect determines the charging power or discharging power of the power storage device by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device by the second coefficient δ and increasing the value. By executing the second control, compared with the case where the control for determining the charging power or discharging power of the power storage device is executed without increasing the difference, it is possible to appropriately suppress the power purchase from the power grid by the distributed power system.

[0052] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing the power purchase from the power grid in the former first control is likely to be greater than the above effect in the latter second control. This is because generally, most of the power demand of the power consumer is covered by the power supplied from the distributed power generation device, and the remaining part is covered by the charging power or discharging power of the power storage device. As a result, the power generation of the fuel cell device tends to be larger than the charging power or discharging power of the power storage device.

[0053] Therefore, if the first coefficient β in the first control is made larger than the second coefficient δ in the second control, as in the power control method of this aspect, compared with the case where their magnitudes are equal or the magnitude relationship between them is reversed, it is possible to appropriately suppress the power purchase from the power grid by the distributed power system.

[0054] The power control method according to the 14th aspect of the present disclosure is the power control method according to the 1st aspect or the 2nd aspect, wherein the distributed power generation device includes a solar power generation device and a fuel cell device, and the first control for determining the upper limit value of power generation of the solar power generation device by multiplying the difference between the sum of the actual power demand of the power consumer and the chargeable power equal to or less than the maximum charging power of the power storage device and the actual power generation of the fuel cell device by the first coefficient γ and increasing the value, or the second control for determining the charging power or discharging power of the power storage device by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device and the actual power generation of the fuel cell device by the second coefficient δ and increasing the value is executed, and the first coefficient γ may be larger than the second coefficient δ.

[0055] As described above, the power control method of this aspect determines the upper limit value of power generation of the photovoltaic power generation device by executing a first control in which a value increased by multiplying a value less than or equal to the difference between the actual power demand of the power consumer and the total chargeable power less than or equal to the maximum chargeable power of the energy storage device and the actual power generation of the fuel cell device by a first coefficient γ. By doing so, compared with the case where control is executed to determine the upper limit value of power generation of the photovoltaic power generation device without increasing the value less than or equal to the difference, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0056] Also, as described above, the power control method of this aspect determines the charge power or discharge power of the energy storage device by executing a second control in which a value increased by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the photovoltaic power generation device and the actual power generation of the fuel cell device by a second coefficient δ. By doing so, compared with the case where control is executed to determine the charge power or discharge power of the energy storage device without increasing the difference, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0057] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing power purchase from the power grid in the former first control is likely to be greater than the above effect in the latter second control. This is because generally, most of the power demand of the power consumer is covered by the power supplied from the distributed power generation device, and the remaining part is covered by the charge power or discharge power of the energy storage device. As a result, the power generation of the photovoltaic power generation device tends to be larger than the charge power or discharge power of the energy storage device.

[0058] Therefore, when the first coefficient γ in the first control is made larger than the second coefficient δ in the second control, as in the power control method of this aspect, compared with the case where their magnitudes are equal or the magnitude relationship between the two is reversed, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0059] The power control method according to the 15th aspect of the present disclosure is the power control method according to the 1st aspect or the 2nd aspect, wherein the distributed power generation device includes a solar power generation device, and the maximum charging power of the actual demand power of the power consumer and the power storage device The first control for determining the power generation upper limit value of the solar power generation device as a value increased by multiplying a value equal to or less than the sum of the chargeable powers by the first coefficient γ, or the difference between the actual demand power of the power consumer and the actual power generation power of the solar power generation device The second control for determining the charging power or the discharging power of the power storage device as a value increased by multiplying by the second coefficient δ is executed, and the first coefficient γ may be larger than the second coefficient δ.

[0060] As described above, in the power control method of this aspect, the first control for determining the power generation upper limit value of the solar power generation device as a value increased by multiplying a value equal to or less than the sum of the actual demand power of the power consumer and the chargeable power equal to or less than the maximum charging power of the power storage device by the first coefficient γ is executed. By doing so, compared with the case where the control for determining the power generation upper limit value of the solar power generation device without increasing the value equal to or less than the sum is executed, the power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0061] Further, as described above, in the power control method of this aspect, the second control for determining the charging power or the discharging power of the power storage device as a value increased by multiplying the difference between the actual demand power of the power consumer and the actual power generation power of the solar power generation device by the second coefficient δ is executed. By doing so, compared with the case where the control for determining the charging power or the discharging power of the power storage device without increasing the difference is executed, the power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0062] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing the power purchase from the power grid in the former first control is likely to be greater than the above effect in the latter second control. This is because, generally, most of the demand power of the power consumer is covered by the supply power from the distributed power generation device, and the remaining part is covered by the charging power or the discharging power of the power storage device. As a result, the power generation power of the solar power generation device tends to be larger than the charging power or the discharging power of the power storage device.

[0063] Therefore, when the first coefficient γ in the first control is made larger than the second coefficient δ in the second control as in the power control method of the present aspect, compared to the case where their magnitudes are equal or the magnitude relationship between the two is reversed, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0064] The power control method according to the 16th aspect of the present disclosure is the power control method according to the 1st aspect, wherein the distributed power generation device includes a fuel cell device, and when one of the fuel cell device and the power storage device abnormally stops, the first coefficient or the second coefficient used to determine the supply power of the other of the fuel cell device and the power storage device may be changed to a value different from that before the abnormal stop.

[0065] When the distributed power generation device includes a fuel cell device, when one of the fuel cell device and the power storage device abnormally stops, power purchase from the power grid by the distributed power system may occur. For this reason, the power control method of the present aspect changes the first coefficient or the second coefficient used to determine the supply power of the other of the fuel cell device and the power storage device to a desired value different from that before the abnormal stop when one of the fuel cell device and the power storage device abnormally stops, so that compared to the case where these coefficients are the same before and after the abnormal stop, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0066] The power control method according to the 17th aspect of the present disclosure is the power control method according to the 1st aspect, wherein the distributed power generation device includes a photovoltaic power generation device, and when one of the photovoltaic power generation device and the power storage device abnormally stops, the first coefficient or the second coefficient used to determine the supply power of the other of the photovoltaic power generation device and the power storage device may be changed to a value different from that before the abnormal stop.

[0067] When the distributed power generation device includes a solar power generation device, if either the solar power generation device or the power storage device stops abnormally, power purchase from the power grid by the distributed power system may occur. Therefore, in the power control method of this aspect, when either the solar power generation device or the power storage device stops abnormally, the first coefficient or the second coefficient used to determine the supply power of the other of the solar power generation device and the power storage device is changed to a desired value different from that before the abnormal stop, so that compared with the case where these coefficients are the same before and after the abnormal stop, power purchase from the power grid by the distributed power system can be appropriately suppressed.

[0068] The power control device according to the 18th aspect of the present disclosure includes a storage device that stores the power demand of a power consumer, and a controller that determines the supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than the power demand of the power consumer when supplying power to the power load of the power consumer from a distributed power system including the distributed power generation device and the power storage device.

[0069] According to such a configuration, the power control device of this aspect can reduce the possibility of power purchase from the power grid more than before. Note that the details of the operational effects achieved by the power control device of this aspect are the same as those achieved by the power control method of the first aspect, so the description is omitted.

[0070] The distributed power system according to the 19th aspect of the present disclosure includes a distributed power generation device, a power storage device, and the power control device according to the 18th aspect.

[0071] According to such a configuration, the distributed power system of this aspect can reduce the possibility of power purchase from the power grid more than before. Note that the details of the operational effects achieved by the distributed power system of this aspect are the same as those achieved by the power control method of the first aspect, so the description is omitted.

[0072] <Further aspect of the present disclosure> If at least one of the first coefficient α, the first coefficient β, the first coefficient γ, and the second coefficient δ is greater than "1", even if the other coefficients are "1", the effect of suppressing power purchase from the power grid can be exerted. From such a perspective, each aspect of the present disclosure below can be further devised.

[0073] When supplying power to the power load of a power consumer from a distributed power system including a solar power generation device, a fuel cell device, and a power storage device, the power control method according to the 20th aspect of the present disclosure multiplies the planned power generation of the fuel cell device by the first coefficient β to increase it to a value obtained by adding a correction value of the planned value based on the actual power demand of the power consumer, the actual power generation of the solar power generation device, and the planned power generation of the fuel cell device, and determines the power generation of the fuel cell device.

[0074] According to the above, the power control device of this aspect can reduce the possibility of power purchase from the power grid more than before. Note that the details of the effects exhibited by the power control device of this aspect are the same as those of the power control method of the 3rd aspect, so the description is omitted.

[0075] When supplying power to the power load of a power consumer from a distributed power system including a fuel cell device and a power storage device, the power control method according to the 21st aspect of the present disclosure multiplies the planned power generation of the fuel cell device by the first coefficient β to increase it to a value obtained by adding a correction value of the planned value based on the actual power demand of the power consumer and the planned power generation of the fuel cell device, and determines the power generation of the fuel cell device.

[0076] According to the above, the power control device of this aspect can reduce the possibility of power purchase from the power grid more than before. Note that the details of the effects exhibited by the power control device of this aspect are the same as those of the power control method of the 4th aspect, so the description is omitted.

[0077] When supplying power to the power load of a power consumer from a distributed power system including a photovoltaic power generation device, a fuel cell device, and a power storage device, the power control method according to the 22nd aspect of the present disclosure determines the upper limit value of power generation of the photovoltaic power generation device as a value obtained by multiplying a value less than or equal to the difference between the actual power demand of the power consumer and the sum of the chargeable power less than or equal to the maximum charge power of the power storage device and the actual power generation of the fuel cell device by the first coefficient γ and increasing the result.

[0078] According to the above, the power control device of this aspect can reduce the possibility of purchasing power from the power grid more than before. Note that the detailed operational effects of the power control device of this aspect are the same as those of the power control method of the 5th aspect, so the description is omitted.

[0079] When supplying power to the power load of a power consumer from a distributed power system including a photovoltaic power generation device and a power storage device, the power control method according to the 23rd aspect of the present disclosure determines the upper limit value of power generation of the photovoltaic power generation device as a value obtained by multiplying a value less than or equal to the sum of the actual power demand of the power consumer and the chargeable power less than or equal to the maximum charge power of the power storage device by the first coefficient γ and increasing the result.

[0080] According to the above, the power control device of this aspect can reduce the possibility of purchasing power from the power grid more than before. Note that the detailed operational effects of the power control device of this aspect are the same as those of the power control method of the 6th aspect, so the description is omitted.

[0081] When supplying power to the power load of a power consumer from a distributed power system including a photovoltaic power generation device, a fuel cell device, and a power storage device, the power control method according to the 24th aspect of the present disclosure determines the charge power or discharge power of the power storage device as a value obtained by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the photovoltaic power generation device and the actual power generation of the fuel cell device by the second coefficient δ and increasing the result.

[0082] According to the above, the power control device of this aspect can reduce the possibility of purchasing power from the power grid more than before. Note that the details of the effects exhibited by the power control device of this aspect are the same as those of the power control method of the seventh aspect, so the description thereof is omitted.

[0083] The power control method of the 25th aspect of the present disclosure, when supplying power to the power load of a power consumer from a distributed power system including a solar power generation device and a power storage device, multiplies the difference between the actual power demand of the power consumer and the actual power generation power of the solar power generation device by a second coefficient δ, and determines the increased value as the charging power or discharging power of the power storage device.

[0084] According to the above, the power control device of this aspect can reduce the possibility of purchasing power from the power grid more than before. Note that the details of the effects exhibited by the power control device of this aspect are the same as those of the power control method of the eighth aspect, so the description thereof is omitted.

[0085] The power control method of the 26th aspect of the present disclosure, when supplying power to the power load of a power consumer from a distributed power system including a fuel cell device and a power storage device, multiplies the difference between the actual power demand of the power consumer and the actual power generation power of the fuel cell device by a second coefficient δ, and determines the increased value as the charging power or discharging power of the power storage device.

[0086] According to the above, the power control device of this aspect can reduce the possibility of purchasing power from the power grid more than before. Note that the details of the effects exhibited by the power control device of this aspect are the same as those of the power control method of the ninth aspect, so the description thereof is omitted.

[0087] Hereinafter, specific examples of the above aspects of the present disclosure will be described with reference to the accompanying drawings. The specific examples described below are all examples showing the above aspects of the present disclosure. Therefore, the shapes, numerical values, components, arrangement positions of the components, connection forms, etc. shown below do not limit the scope of the claims unless they are described in the claims.

[0088] Among the components described below, components not described in the independent claims indicating the top-level concept of the present disclosure are described as optional components. Also, in the drawings, components with the same reference numerals may be omitted from the description. The drawings schematically show each component for ease of understanding, and may not be accurate representations of shapes, dimensional ratios, etc.

[0089] Furthermore, in the operation of the device, the order of steps may be changed as necessary, or known steps may be added.

[0090] (First Embodiment) [Device Configuration] FIG. 1 is a diagram showing an example of a distributed power system according to the first embodiment. FIG. 2 is a diagram showing an example of a power control device according to the first embodiment.

[0091] As shown in FIG. 1, the distributed power system 10 of the present embodiment includes a power control device 20, a distributed power generation device 31, and a power storage device 32. The specific configuration of the distributed power generation device 31 will be described in the examples.

[0092] The power storage device 32 is a device that stores the power generated by the distributed power generation device 31 or the power received from the power grid under the control of the power control device 20. The power stored in the power storage device 32 may be discharged to the power load 40 of the power consumer or the power grid under the control of the power control device 20. The power storage device 32 can transmit, at an appropriate timing, the state of charge SOC (State of charge) indicating the remaining amount of the electric power (charge amount) stored in the power storage device 32 to the power control device 20. Examples of the power storage device 32 include, but are not limited to, well-known secondary batteries. The power storage device 32 includes a group of battery units composed of a plurality of battery units, and the detailed configuration of the power storage device 32 will be described in the second embodiment. As shown in FIG. 2, the power control device 20 includes a memory 21 and a controller 22.

[0093] ​

[0094] The memory 21 is a memory for storing the power demand of the power consumer.

[0095] Here, the "power consumer" is the owner of the power load 40 that receives the power supply service generated by the distributed power system 10. Examples of the "power consumer" include, but are not limited to, factories, stores, ordinary households, etc.

[0096] When supplying power from the distributed power system 10 to the power load 40 of the power consumer, the controller 22 determines the supply power of the distributed power generation device 31 using a first coefficient so that the supply power of the distributed power generation device 31 is greater than the power demand of the power consumer. Specific examples of the "first coefficient" will be described in the embodiments.

[0097] The controller 22 only needs to have a control function, and includes an arithmetic processing unit (not shown) and a storage unit (not shown) that stores a control program. By reading and executing the control program stored in the storage unit by the arithmetic processing unit, predetermined control is performed in the controller 22. As the arithmetic processing unit, for example, a microprocessor is exemplified. As the storage unit, for example, a memory is exemplified.

[0098] [Operation] FIG. 3 is a flowchart showing an example of the operation (power control method) of the power control device according to the first embodiment.

[0099] The following operations may be performed, for example, by the arithmetic processing unit of the controller 22 of the power control device 20 reading the control program from the storage unit of the controller 22. However, it is not necessarily essential to perform the following operations by the controller 22. The operator may perform some of the operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0100] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0101] Next, in step S2, the supply power of the distributed power generation device 31 is determined using the first coefficient so that the supply power becomes greater than the demand power of the power consumer.

[0102] According to the present embodiment described above, the possibility of purchasing power from the power grid can be reduced more than before.

[0103] Specifically, in the present embodiment, although the possibility of reverse power flow to the power grid increases, this is tolerated, and the supply power of the distributed power generation device 31 is determined using the first coefficient so that the supply power of the distributed power generation device 31 becomes greater than the demand power of the power consumer. Thereby, the present embodiment can appropriately suppress the purchase of power from the power grid by the distributed power system 10 as compared with the case where the supply power of the distributed power generation device 31 is not determined using the first coefficient.

[0104] (First Embodiment) The power control method of the present embodiment is the same as that of the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0105] FIG. 4A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the first embodiment of the first embodiment.

[0106] In the example shown in FIG. 4A, the distributed power generation device 31 includes a solar power generation device 31A and a fuel cell device 31B.

[0107] The solar power generation device 31A generates electricity by converting light energy into electric power using sunlight under the control of the power control device 20. The power generated by the solar power generation device 31A is supplied to the power load 40, the power grid, or the power storage device 32. As the solar power generation device 31A, a well-known device can be used.

[0108] The fuel cell device 31B generates electricity using hydrogen supplied from a hydrogen supply source (not shown) under the control of the power control device 20. The electricity generated by the fuel cell device 31B is supplied to the power load 40, the power grid, or the energy storage device 32. As the fuel cell device 31B, a well-known device can be used. As the hydrogen supply source, for example, a hydrogen storage tank can be mentioned, but it is not limited thereto.

[0109] Note that the distributed power generation device 31 may be, for example, a system that supplies a large amount of power to the power grid. In this case, the solar power generation device 31A and the fuel cell device 31B each include a solar cell group composed of a plurality of solar cells including solar cell panels and a fuel cell unit group composed of a plurality of fuel cell units including fuel cell stacks, respectively. However, the detailed configuration of such a distributed power generation device 31 will be described in the second embodiment.

[0110] FIG. 4B is a flowchart showing an example of the operation of the power control device (power control method) in the first example of the first embodiment.

[0111] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential for the controller 22 to perform the following operations. The operator may perform some of these operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0112] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0113] Next, in step S2A, the planned power generation value of the fuel cell device 31B is determined so as to satisfy the difference between the value obtained by multiplying the predicted or actual power demand of the power consumer by the first coefficient α and the predicted or actual power generation of the solar power generation device 31A. Note that the actual power demand of the power consumer is, in other words, the actual value of the power demand of the power consumer. Also, the actual power generation of the solar power generation device 31A is, in other words, the actual value of the power generation of the solar power generation device 31A.

[0114] Here, the "predicted value of the power demand of the power consumer" can be appropriately determined, for example, from the past plant operation performance data indicating the operating days or non-operating days of the plant stored in the memory 21 and the actual performance data of the power consumption of the power load 40 corresponding to the operating days or non-operating days of the plant when the power load 40 of the power consumer is the power consumption equipment in the factory. The "actual power demand of the power consumer" is the actual value of the power consumed by the power load 40, which may be the latest actual performance data of the power consumption of the power load 40 stored in the memory 21, or may be the moving average value of the latest actual performance data of the power consumption of the power load 40 sampled during an appropriate sampling period and stored in the memory 21.

[0115] The "predicted value of the power of the solar power generation device 31A" can be appropriately determined from the past weather data and the like stored in the memory 21. The "actual power generation of the solar power generation device 31A" may be the latest actual performance data of the power generation of the solar power generation device 31A stored in the memory 21, or may be the moving average value of the latest actual performance data of the power generation of the solar power generation device 31A sampled during an appropriate sampling period and stored in the memory 21.

[0116] The information indicating the "planned power generation value of the fuel cell device 31B" determined in step S2A may be transmitted to the controller of the fuel cell device 31B via a communication network. Examples of such a controller include, but are not limited to, the control device 50B described in the second embodiment.

[0117] The "first coefficient α" is a coefficient for overestimating the predicted demand power or the actual demand power of the power consumer compared to the actual data in determining the planned power generation of the fuel cell device 31B, and may be an appropriate value greater than "1" that can be specified by the user or the like. The user includes direct or indirect users of the power control device 20. The direct user of the power control device 20 is, for example, the administrator of the power control device 20. Indirect users of the power control device 20 can include, for example, the owner of the distributed power system 10. Such an owner may be the above-mentioned power consumer or a power generation company that supplies power to the power consumer using the distributed power system 10.

[0118] The power generation of the fuel cell device 31B (hereinafter, the power generation of the present disclosure) calculated from the difference between the value obtained by multiplying the predicted or actual demand power of the power consumer by the first coefficient α and increasing it and the predicted or actual power generation of the solar power generation device 31A is greater than the power generation of the fuel cell device 31B (hereinafter, the power generation of the comparative example) calculated from the difference between the predicted or actual demand power of the power consumer and the predicted or actual power generation of the solar power generation device 31A.

[0119] Here, the "power generation of the comparative example" corresponds to power for which power purchase from the power grid is not easily induced. That is, the "power generation of the present disclosure" is power further increased using the first coefficient α from the power for which power purchase from the power grid is not easily induced.

[0120] Therefore, in this embodiment, by determining the planned power generation of the fuel cell device 31B so as to satisfy the difference between the value obtained by multiplying the predicted or actual demand power of the power consumer by the first coefficient α and increasing it and the predicted or actual power generation of the solar power generation device 31A, compared to the case where the planned power generation of the fuel cell device 31B is determined without increasing the predicted or actual demand power of the power consumer, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0121] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as those of the first embodiment except for the above features.

[0122] (Second Embodiment) The power control method of this embodiment is the same as that of the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0123] FIG. 5A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the second embodiment of the first embodiment.

[0124] In the example shown in FIG. 5A, the distributed power generation device 31 includes a solar power generation device 31A and a fuel cell device 31B. However, since the configurations of the solar power generation device 31A and the fuel cell device 31B are the same as those of the first embodiment, the description thereof is omitted.

[0125] FIG. 5B is a flowchart showing an example of the operation of the power control device (power control method) in the second embodiment of the first embodiment.

[0126] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential that the following operations be performed by the controller 22. The operator may perform some of the following operations. In the following example, the case where the operation is controlled by the controller 22 will be described.

[0127] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0128] Next, in step S2B, the planned power generation of the fuel cell device 31B is multiplied by the first coefficient β and increased to a value obtained by adding the actual demand power of the power consumer, the actual power generation of the solar power generation device 31A, and a correction value of the planned value based on the planned power generation of the fuel cell device 31B. This increased value is determined as the power generation of the fuel cell device 31B.

[0129] Here, the "first coefficient β" is a coefficient for overestimating, in determining the power generation power of the fuel cell device 31B, "the value obtained by adding the correction value of the planned value based on the planned power generation power of the fuel cell device 31B, the actual demand power of the power consumer, and the actual power generation power of the solar power generation device 31A to the planned power generation power of the fuel cell device 31B" compared to the actual data, and it may be an appropriate numerical value greater than "1" that can be specified by the user or the like. Since the "user" is the same as above, detailed description is omitted. The information indicating the "power generation power of the fuel cell device 31B" determined in step S2B may be transmitted to the controller of the fuel cell device 31B via the communication network in the same manner as above.

[0130] As the "correction value of the planned value based on the actual demand power of the power consumer, the actual power generation power of the solar power generation device 31A, and the planned power generation power of the fuel cell device 31B", for example, the difference between the actual demand power of the power consumer and the sum of the actual power generation power of the solar power generation device 31A and the planned power generation power of the fuel cell device 31B, or the correction value FC described in the second embodiment sub and the like can be cited, but it is not limited thereto.

[0131] Note that the "actual demand power of the power consumer" and the "actual power generation power of the solar power generation device 31A" in step S2B are the same as above, so detailed description is omitted.

[0132] When the distributed power generation device 31 includes the solar power generation device 31A and the fuel cell device 31B, the value obtained by adding the correction value of the planned value to the planned power generation power of the fuel cell device 31B corresponds to the power generation power of the fuel cell device 31B that is less likely to induce power purchase from the power grid. That is, the value increased by multiplying the sum of the above planned value and the correction value of the planned value by the first coefficient β is the power further increased using the first coefficient β from the power that is less likely to induce power purchase from the power grid.

[0133] Therefore, in this embodiment, by determining the power generation power of the fuel cell device 31B as a value obtained by multiplying a value obtained by adding a correction value of the planned value to the planned value of the power generation power of the fuel cell device 31B by a first coefficient β, compared with the case where the power generation power of the fuel cell device 31B is determined without multiplying by the first coefficient β, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0134] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as those of the first embodiment or the first example of the first embodiment except for the above features.

[0135] (Third Embodiment) The power control method of this embodiment is the same as that of the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0136] FIG. 6A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the third example of the first embodiment.

[0137] In the example shown in FIG. 6A, the distributed power generation device 31 includes a fuel cell device 31B. However, since the configuration of the fuel cell device 31B is the same as that of the first example, the description thereof is omitted.

[0138] FIG. 6B is a flowchart showing an example of the operation of the power control device (power control method) in the third example of the first embodiment.

[0139] The following operations may be performed, for example, when an arithmetic processing unit of a controller 22 (see FIG. 2) of the power control device 20 reads a control program from a storage unit of the controller 22. However, it is not always essential that the following operations be performed by the controller 22. The operator may perform some of the operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0140] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0141] Next, in step S2C, a value obtained by multiplying, by a first coefficient β, a value obtained by adding a correction value of the planned power generation value of the fuel cell device 31B based on the actual power demand of the power consumer and the planned power generation value of the fuel cell device 31B to the planned power generation value of the fuel cell device 31B is determined as the power generation power of the fuel cell device 31B.

[0142] Here, the "first coefficient β" is a coefficient for overestimating, in the determination of the power generation power of the fuel cell device 31B, "a value obtained by adding a correction value of the planned power generation value based on the actual power demand of the power consumer and the planned power generation value of the fuel cell device 31B to the planned power generation value of the fuel cell device 31B" more than the actual data, and may be an appropriate numerical value greater than "1" that can be specified by a user or the like. Since the "user" is the same as above, detailed description is omitted. Information indicating the "power generation power of the fuel cell device 31B" determined in step S2C may be transmitted to the controller of the fuel cell device 31B via the communication network as described above.

[0143] As the "correction value of the planned value based on the actual power demand of the power consumer and the planned power generation value of the fuel cell device 31B", for example, the difference between the actual power demand of the power consumer and the planned power generation value of the fuel cell device 31B, or the correction value FC described in the second embodiment sub and the like can be cited, but are not limited thereto.

[0144] Note that since the "actual power demand of the power consumer" in step S2C is the same as above, detailed description is omitted.

[0145] When the distributed power generation device 31 includes the fuel cell device 31B, a value obtained by adding the correction value of the planned power generation value of the fuel cell device 31B to the planned power generation value of the fuel cell device 31B corresponds to the power generation power of the fuel cell device 31B that is less likely to induce power purchase from the power grid. That is, a value obtained by multiplying, by the first coefficient β, the sum of the planned value and the correction value of the planned value is the power further increased using the first coefficient β from the power generation power that is less likely to induce power purchase from the power grid.

[0146] Therefore, in this embodiment, the generated power of the fuel cell device 31B is determined by multiplying the value obtained by adding the correction value of the planned value to the planned value of the generated power of the fuel cell device 31B by the first coefficient β and increasing the result. By doing so, compared with the case where the generated power of the fuel cell device 31B is determined without multiplying by the first coefficient β, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0147] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to second examples of the first embodiment, except for the above features.

[0148] (Fourth Embodiment) The power control method of this embodiment is the same as that of the first embodiment, except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0149] FIG. 7A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the fourth example of the first embodiment.

[0150] In the example shown in FIG. 7A, the distributed power generation device 31 includes a solar power generation device 31A and a fuel cell device 31B. Since the configurations of the solar power generation device 31A and the fuel cell device 31B are the same as those of the first example, the description thereof is omitted.

[0151] FIG. 7B is a flowchart showing an example of the operation of the power control device (power control method) in the fourth example of the first embodiment.

[0152] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads the control program from the storage unit of the controller 22. However, it is not necessarily essential for the controller 22 to perform the following operations. The operator may perform some of the operations. In the following example, the case where the controller 22 controls the operation will be described.

[0153] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0154] Next, in step S2D, the value obtained by multiplying by the first coefficient γ the value that is less than or equal to the difference between the actual power demand of the power consumer and the total chargeable power less than or equal to the maximum charge power of the energy storage device 32 and the actual power generation power of the fuel cell device 31B is determined as the power generation upper limit value of the photovoltaic power generation device 31A.

[0155] Here, the "first coefficient γ" is a coefficient for overestimating "the value less than or equal to the difference between the actual power demand of the power consumer and the total chargeable power less than or equal to the maximum charge power of the energy storage device 32 and the actual power generation power of the fuel cell device 31B" more than the actual data in determining the power generation upper limit value of the photovoltaic power generation device 31A, and may be an appropriate numerical value greater than "1" that can be specified by the user or the like. The "user" is the same as above, so detailed description is omitted. The information indicating the "power generation upper limit value of the photovoltaic power generation device 31A" determined in step S2D may be transmitted to the controller of the photovoltaic power generation device 31A via the communication network. Examples of such a controller include, but are not limited to, the control device 50A described in the second embodiment.

[0156] The "maximum charge power of the energy storage device 32" is the charging capacity (kW) of the energy storage device 32 determined according to the specifications and usage conditions of the energy storage device 32. The "maximum charge power of the energy storage device 32" may be transmitted from the energy storage device 32 to the power control device 20 at an appropriate timing. The "chargeable power of the energy storage device 32" may be, for example, the above maximum charge power, or a value less than the above maximum charge power that can be specified by the user or the like.

[0157] Note that since the "actual required power of the power consumer" in step S2D is the same as above, a detailed explanation is omitted. Also, the "actual generated power of the fuel cell device 31B" may be the latest performance value data of the generated power of the fuel cell device 31B stored in the storage device 21, or may be the moving average value of the most recent performance data of the generated power of the fuel cell device 31B sampled during an appropriate sampling period and stored in the storage device 21.

[0158] When the distributed power generation device 31 includes the solar power generation device 31A and the fuel cell device 31B, the value below the difference between the sum of the actual required power of the power consumer and the chargeable power below the maximum charge power of the power storage device 32 and the actual generated power of the fuel cell device 31B corresponds to the generated power of the solar power generation device 31A where power purchase from the power grid is less likely to be induced. That is, the value increased by multiplying the value below the above difference by the first coefficient γ is the power further increased using the first coefficient β from the generated power where power purchase from the power grid is less likely to be induced.

[0159] Therefore, in this embodiment, by determining the value increased by multiplying the value below the difference between the sum of the actual required power of the power consumer and the chargeable power below the maximum charge power of the power storage device 32 and the actual generated power of the fuel cell device 31B by the first coefficient γ as the power generation upper limit value of the solar power generation device 31A, compared to the case where the power generation upper limit value of the solar power generation device 31A is determined without increasing the value below the difference, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0160] The power control method, power control device 20, and distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to third examples of the first embodiment except for the above features.

[0161] (Fifth Embodiment) The power control method of this embodiment is the same as the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0162] FIG. 8A is a diagram showing an example of a distributed power generation device provided in the distributed power supply system according to the fifth embodiment of the first embodiment.

[0163] In the example shown in FIG. 8A, the distributed power generation device 31 includes a solar power generation device 31A. Since the configuration of the solar power generation device 31A is the same as that of the first embodiment, the description thereof is omitted.

[0164] FIG. 8B is a flowchart showing an example of the operation of the power control device (power control method) according to the fifth embodiment of the first embodiment.

[0165] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential that the following operations be performed by the controller 22. The operator may perform some of the operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0166] First, in step S1, power is supplied from the distributed power supply system 10 to the power load 40 of the power consumer.

[0167] Next, in step S2E, a value obtained by multiplying a value less than or equal to the sum of the actual power demand of the power consumer and the chargeable power below the maximum charge power of the power storage device 32 by the first coefficient γ is determined as the power generation upper limit value of the solar power generation device 31A.

[0168] Here, the "first coefficient γ" is a coefficient for overestimating "the value less than or equal to the sum of the actual power demand of the power consumer and the chargeable power below the maximum charge power of the power storage device 32" rather than the actual data in determining the power generation upper limit value of the solar power generation device 31A, and may be an appropriate numerical value greater than "1" that can be specified by the user or the like. The "user" is the same as above, and the detailed description thereof is omitted. Information indicating the "power generation upper limit value of the solar power generation device 31A" determined in step S2E may be transmitted to the controller of the solar power generation device 31A via the communication network in the same manner as above.

[0169] Note that the "actual required power of the power consumer" and the "maximum charging power of the power storage device 32" in step S2E are the same as above, so detailed description thereof is omitted.

[0170] When the distributed power generation device 31 includes the solar power generation device 31A, the value below the sum of the actual required power of the power consumer and the chargeable power below the maximum charging power of the power storage device 32 corresponds to the generated power of the solar power generation device 31A where power purchase from the power grid is hardly induced. That is, the value obtained by multiplying the value below the above sum by the first coefficient γ is the power further increased using the first coefficient γ from the generated power where power purchase from the power grid is hardly induced.

[0171] Therefore, in this embodiment, by determining the value obtained by multiplying the value below the sum of the actual required power of the power consumer and the chargeable power below the maximum charging power of the power storage device 32 by the first coefficient γ as the power generation upper limit value of the solar power generation device 31A, compared with the case where the power generation upper limit value of the solar power generation device 31A is determined without increasing the value below the sum, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0172] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to fourth examples of the first embodiment except for the above features.

[0173] (Sixth Embodiment) The power control method of this embodiment is the same as that of the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0174] FIG. 9A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the sixth example of the first embodiment.

[0175] In the example shown in FIG. 9A, the distributed power generation device 31 includes a solar power generation device 31A and a fuel cell device 31B. Since the configurations of the solar power generation device 31A and the fuel cell device 31B are the same as those in the first embodiment, the description thereof is omitted.

[0176] FIG. 9B is a flowchart showing an example of the operation of the power control device (power control method) in the sixth embodiment of the first embodiment.

[0177] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not always essential to perform the following operations by the controller 22. The operator may perform some of the operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0178] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0179] Next, in step S2F, a value obtained by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device 31A and the actual power generation of the fuel cell device 31B by a second coefficient δ is determined as the charging power or the discharging power of the power storage device 32.

[0180] Here, the "second coefficient δ" is a coefficient for overevaluating the "difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device 31A and the actual power generation of the fuel cell device 31B" more than the actual data in determining the charging power or the discharging power of the power storage device 32, and may be an appropriate numerical value greater than "1" that can be specified by the user or the like. The "user" is the same as above, and the detailed description thereof is omitted. Information indicating the "charging power or the discharging power of the power storage device 32" determined in step S2F may be transmitted to the controller of the power storage device 32 via a communication network. Examples of such a controller include, but are not limited to, the control device 50C described in the second embodiment.

[0181] Note that the "actual power demand of the power consumer", "actual power generation of the solar power generation device 31A", and "actual power generation of the fuel cell device 31B" in step S2F are the same as above, so detailed descriptions are omitted.

[0182] When the distributed power generation device 31 includes the solar power generation device 31A and the fuel cell device 31B, the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device 31A and the actual power generation of the fuel cell device 31B corresponds to the charging power or discharging power of the energy storage device 32 where power purchase from the power grid is not easily induced. That is, the value increased by multiplying the above difference by the second coefficient δ is the power further increased using the second coefficient δ from the power where power purchase from the power grid is not easily induced.

[0183] Therefore, in this embodiment, by determining the charging power or discharging power of the energy storage device 32 as the value increased by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device 31A and the actual power generation of the fuel cell device 31B by the second coefficient δ, compared with the case where the charging power or discharging power of the energy storage device 32 is determined without increasing the difference, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0184] The power control method, power control device 20, and distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to fifth examples of the first embodiment except for the above features.

[0185] (Seventh Embodiment) The power control method of this embodiment is the same as that of the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0186] FIG. 10A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the seventh example of the first embodiment.

[0187] In the example shown in FIG. 10A, the distributed power generation device 31 includes a photovoltaic power generation device 31A. Since the configuration of the photovoltaic power generation device 31A is the same as that in the first embodiment, the description thereof is omitted.

[0188] FIG. 10B is a flowchart showing an example of the operation of the power control device (power control method) in the seventh embodiment of the first embodiment.

[0189] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not always essential that the following operations be performed by the controller 22. The operator may perform some of the operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0190] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0191] Next, in step S2G, a value obtained by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the photovoltaic power generation device 31A by the second coefficient δ is determined as the charging power or discharging power of the energy storage device 32.

[0192] Here, the "second coefficient δ" is a coefficient for overestimating the "difference between the actual power demand of the power consumer and the actual power generation of the photovoltaic power generation device 31A" rather than the actual data in determining the charging power or discharging power of the energy storage device 32, and may be an appropriate value greater than "1" that can be specified by the user or the like. The "user" is the same as above, and the detailed description thereof is omitted. Information indicating the "charging power or discharging power of the energy storage device 32" determined in step S2G may be transmitted to the controller of the energy storage device 32 via the communication network in the same manner as above.

[0193] Note that the "actual power demand of the power consumer" and the "actual power generation of the photovoltaic power generation device 31A" in step S2G are the same as above, and the detailed description thereof is omitted.

[0194] When the distributed power generation device 31 includes the solar power generation device 31A, the difference between the actual power demand of the power consumer and the actual power generation of the solar power generation device 31A corresponds to the charging power or the discharging power of the energy storage device 32 in which power purchase from the power grid is not easily induced. That is, the value obtained by multiplying the above difference by the second coefficient δ is the power further increased using the second coefficient δ from the power in which power purchase from the power grid is not easily induced.

[0195] Therefore, in this embodiment, by determining the charging power or the discharging power of the energy storage device 32 as the value obtained by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the solar power generation device 31A by the second coefficient δ, compared with the case where the charging power or the discharging power of the energy storage device 32 is determined without increasing the difference, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0196] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to sixth examples of the first embodiment except for the above features.

[0197] (Eighth Embodiment) The power control method of this embodiment is the same as that of the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0198] FIG. 11A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the eighth example of the first embodiment.

[0199] In the example shown in FIG. 11A, the distributed power generation device 31 includes the fuel cell device 31B. Since the configuration of the fuel cell device 31B is the same as that of the first example, the description thereof is omitted.

[0200] FIG. 11B is a flowchart showing an example of the operation of the power control device (power control method) in the eighth example of the first embodiment.

[0201] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential for the controller 22 to perform the following operations. An operator may perform some of these operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0202] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0203] Next, in step S2H, a value obtained by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device 31B by the second coefficient δ and increasing it is determined as the charging power or discharging power of the power storage device 32.

[0204] Here, the "second coefficient δ" is a coefficient for overevaluating the "difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device 31B" rather than actual data in determining the charging power or discharging power of the power storage device 32, and may be an appropriate numerical value greater than "1" that can be specified by a user or the like. The "user" is the same as above, so detailed description is omitted. Information indicating the "charging power or discharging power of the power storage device 32" determined in step S2H may be transmitted to the controller of the power storage device 32 via the communication network as described above.

[0205] Note that the "actual power demand of the power consumer" and the "actual power generation of the fuel cell device 31B" in step S2H are the same as above, so detailed description is omitted.

[0206] When the distributed power generation device 31 includes the fuel cell device 31B, the difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device 31B corresponds to the charging power or discharging power of the power storage device 32 in which power purchase from the power grid is hardly induced. That is, the value obtained by multiplying the above difference by the second coefficient δ and increasing it is power further increased using the second coefficient δ from power in which power purchase from the power grid is hardly induced.

[0207] Therefore, in this embodiment, by determining the charging power or discharging power of the power storage device 32 as a value increased by multiplying the difference between the actual power demand of the power consumer and the actual power generation of the fuel cell device 31B by the second coefficient δ, compared with the case where the charging power or discharging power of the power storage device 32 is determined without increasing the difference, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0208] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to seventh examples of the first embodiment, except for the above features.

[0209] (Ninth Embodiment) The power control method of this embodiment is the same as that of the first embodiment, except that the first coefficient varies according to the season. Since the "first coefficient" can be easily understood from the above description, a detailed description thereof is omitted.

[0210] As an example, the "first coefficient α", the "first coefficient β", and the "first coefficient γ" may be set to vary according to the season, as shown in Table 1 below. However, these numerical values are for illustration and are not limited to this example.

[0211] [Table 1]

[0212] Generally, the power generation of the solar power generation device 31A and the power demand of the power consumer change according to the season. Therefore, in this embodiment, by setting the first coefficient to a desired value according to the season, the amount of power purchased from the power grid can be reduced compared with the case where the first coefficient is constant for each season.

[0213] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to eighth examples of the first embodiment, except for the above features.

[0214] (Example 10) The power control method of this embodiment is the same as any one of the 6th to 8th embodiments of the first embodiment, except that the second coefficient varies according to seasons. Since the "second coefficient" can be easily understood from the above description, detailed explanation thereof is omitted.

[0215] As an example, the "second coefficient δ" may be set to vary according to seasons as shown in Table 1 above. However, these numerical values are for illustration purposes only and are not limited to this example.

[0216] Generally, the generated power of the photovoltaic power generation device 31A and the power demand of the power consumer vary according to seasons. Therefore, in this embodiment, by setting the second coefficient to a desired value according to seasons, the amount of power purchased from the power grid can be reduced compared with the case where the second coefficient is constant for each season.

[0217] The power control method, the power control device 20 and the distributed power system 10 of this embodiment may be the same as any one of the first embodiment and the 1st to 9th embodiments of the first embodiment, except for the above features.

[0218] (Example 11) The power control method of this embodiment is the same as that of the first embodiment, except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0219] FIG. 12A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the 11th embodiment of the first embodiment.

[0220] In the example shown in FIG. 12A, the distributed power generation device 31 includes a photovoltaic power generation device 31A and a fuel cell device 31B. Since the configurations of the photovoltaic power generation device 31A and the fuel cell device 31B are the same as those of the first embodiment, the description thereof is omitted.

[0221] FIG. 12B is a flowchart showing an example of the operation of the power control device (power control method) in the eleventh embodiment of the first embodiment.

[0222] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential that the following operations be performed by the controller 22. The operator may perform some of these operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0223] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0224] Next, in step S2I, a first control is executed to determine the power generation power of the fuel cell device 31B by multiplying a value obtained by adding a correction value of the planned value based on the actual demand power of the power consumer, the actual power generation power of the solar power generation device 31A, and the planned value of the power generation power of the fuel cell device 31B to the planned value of the power generation power of the fuel cell device 31B by a first coefficient β, or a second control is executed to determine the charging power or discharging power of the energy storage device 32 by multiplying a value obtained by multiplying the difference between the actual demand power of the power consumer and the sum of the actual power generation power of the solar power generation device 31A and the actual power generation power of the fuel cell device 31B by a second coefficient δ. Here, the first coefficient β is larger than the second coefficient δ.

[0225] The "first control" in step S2I can be easily understood from the description of the second embodiment, so a detailed description thereof will be omitted. The "second control" in step S2I can be easily understood from the description of the sixth embodiment, so a detailed description thereof will be omitted.

[0226] In this embodiment, as described above, the generated power of the fuel cell device 31B is determined by multiplying the planned value of the generated power of the fuel cell device 31B by the first coefficient β after adding the correction value of the planned value. By executing the first control, compared with the case where the control for determining the generated power of the fuel cell device 31B without multiplying by the first coefficient β is executed, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0227] Further, in this embodiment, as described above, the charging power or discharging power of the power storage device 32 is determined by multiplying the difference between the actual power demand of the power consumer and the sum of the actual generated power of the solar power generation device 31A and the actual generated power of the fuel cell device 31B by the second coefficient δ. By executing the second control, compared with the case where the control for determining the charging power or discharging power of the power storage device 32 without increasing the difference is executed, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0228] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing the power purchase from the power grid in the former first control is likely to be greater than the above effect in the latter second control. This is because generally, most of the power demand of the power consumer is covered by the supply power from the distributed power generation device 31, and the remaining part is covered by the charging power or discharging power of the power storage device 32. As a result, the generated power of the fuel cell device 31B tends to be larger than the charging power or discharging power of the power storage device 32.

[0229] Therefore, as in this embodiment, when the first coefficient β in the first control is made larger than the second coefficient δ in the second control, compared with the case where their magnitudes are equal or the magnitude relationship between them is reversed, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0230] The power control method, power control device 20, and distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to tenth examples of the first embodiment, except for the above features.

[0231] (The 12th embodiment) The power control method of this embodiment is the same as that of the first embodiment, except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0232] FIG. 13A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the 12th embodiment of the first embodiment.

[0233] In the example shown in FIG. 13A, the distributed power generation device 31 includes a fuel cell device 31B. However, since the configuration of the fuel cell device 31B is the same as that of the first example, the description thereof is omitted.

[0234] FIG. 13B is a flowchart showing an example of the operation of the power control device (power control method) in the 12th embodiment of the first embodiment.

[0235] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential for the controller 22 to perform the following operations. The operator may perform some of the following operations. In the following example, the case where the controller 22 controls the operation will be described.

[0236] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0237] Next, in step S2J, a value obtained by multiplying, by a first coefficient β, a value obtained by adding a correction value of the planned power generation of the fuel cell device 31B to the planned power generation value of the fuel cell device 31B and the actual demand power of the power consumer is increased, and the increased value is determined as the power generation power of the fuel cell device 31B in a first control, or a value obtained by multiplying, by a second coefficient δ, the difference between the actual demand power of the power consumer and the actual power generation power of the fuel cell device 31B is increased, and the increased value is determined as the charging power or the discharging power of the power storage device 32 in a second control is executed. Here, the first coefficient β is larger than the second coefficient δ.

[0238] The "first control" in step S2J can be easily understood from the description of the third embodiment, so a detailed description thereof will be omitted. The "second control" in step S2J can be easily understood from the description of the eighth embodiment, so a detailed description thereof will be omitted.

[0239] As described above, in this embodiment, by executing the first control in which a value obtained by multiplying, by the first coefficient β, a value obtained by adding the correction value of the planned power generation to the planned power generation value of the fuel cell device 31B is determined as the power generation power of the fuel cell device 31B, compared with the case where control is executed to determine the power generation power of the fuel cell device 31B without multiplying by the first coefficient β, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0240] Also, as described above, in this embodiment, by executing the second control in which a value obtained by multiplying, by the second coefficient δ, the difference between the actual demand power of the power consumer and the actual power generation power of the fuel cell device 31B is determined as the charging power or the discharging power of the power storage device 32, compared with the case where control is executed to determine the charging power or the discharging power of the power storage device without increasing the difference, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0241] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing power purchase from the power grid in the former first control is likely to be greater than the effect in the latter second control. This is because, generally, most of the power demand of power consumers is covered by the power supplied from the distributed power generation device 31, and the remaining part is covered by the charging or discharging power of the energy storage device 32. As a result, the power generated by the fuel cell device 31B tends to be greater than the charging or discharging power of the energy storage device 32.

[0242] Therefore, as in this embodiment, when the first coefficient β in the first control is made larger than the second coefficient δ in the second control, compared with the case where their magnitudes are equal or the magnitude relationship between the two is reversed, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0243] The power control method, power control device 20, and distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to eleventh examples of the first embodiment, except for the above features.

[0244] (The 13th Embodiment) The power control method of this embodiment is the same as that of the first embodiment, except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0245] FIG. 14A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the 13th embodiment of the first embodiment.

[0246] In the example shown in FIG. 14A, the distributed power generation device 31 includes a solar power generation device 31A and a fuel cell device 31B. Since the configurations of the solar power generation device 31A and the fuel cell device 31B are the same as those in the first example, the description thereof is omitted.

[0247] FIG. 14B is a flowchart showing an example of the operation of the power control device (power control method) in the 13th embodiment of the first embodiment.

[0248] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential to perform the following operations by the controller 22. The operator may perform some of the operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0249] First, in step S1, power is supplied from the distributed power system 10 to the power load 40 of the power consumer.

[0250] Next, in step S2K, a first control for determining the power generation upper limit value of the solar power generation device 31A by multiplying a value increased by multiplying the difference between the actual power demand of the power consumer and the sum of the chargeable power below the maximum charge power of the power storage device 32 and the actual power generation power of the fuel cell device 31B by a first coefficient γ, or a second control for determining the charge power or discharge power of the power storage device 32 by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation powers of the solar power generation device 31A and the fuel cell device 31B by a second coefficient δ is executed. Here, the first coefficient γ is larger than the second coefficient δ.

[0251] The "first control" in step S2K can be easily understood from the description of the fourth embodiment, so a detailed description thereof will be omitted. The "second control" in step S2K can be easily understood from the description of the sixth embodiment, so a detailed description thereof will be omitted.

[0252] In this embodiment, as described above, by executing the first control for determining the power generation upper limit value of the solar power generation device 31A by multiplying a value increased by multiplying the difference between the actual power demand of the power consumer and the sum of the chargeable power below the maximum charge power of the power storage device 32 and the actual power generation power of the fuel cell device 31B by a first coefficient γ, compared with the case where the control for determining the power generation upper limit value of the solar power generation device 31A without increasing the value below the difference is executed, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0253] Further, as described above, in this embodiment, a second control is executed to determine the charging power or discharging power of the power storage device 32 based on a value obtained by multiplying the difference between the actual power demand of the power consumer and the sum of the actual power generation of the solar power generation device 31A and the actual power generation of the fuel cell device 31B by a second coefficient δ. By doing so, compared with the case where control is executed to determine the charging power or discharging power of the power storage device 32 without increasing the difference, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0254] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing power purchase from the power grid in the former first control is likely to be greater than the above-described effect in the latter second control. This is because generally, most of the power demand of the power consumer is covered by the power supplied from the distributed power generation device 31, and the remaining part is covered by the charging power or discharging power of the power storage device 32. As a result, the power generation of the solar power generation device 31A tends to be greater than the charging power or discharging power of the power storage device 32.

[0255] Therefore, as in this embodiment, if the first coefficient γ in the first control is made larger than the second coefficient δ in the second control, compared with the case where their magnitudes are equal or the magnitude relationship between the two is reversed, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0256] The power control method, power control device 20, and distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to twelfth examples of the first embodiment, except for the above features.

[0257] (Example 14) The power control method of this embodiment is the same as that of the first embodiment, except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0258] FIG. 15A is a diagram showing an example of a distributed power generation device provided in the distributed power supply system of the 14th embodiment of the first embodiment.

[0259] In the example shown in FIG. 15A, the distributed power generation device 31 includes a solar power generation device 31A. However, since the configuration of the solar power generation device 31A is the same as that of the first embodiment, the description thereof is omitted.

[0260] FIG. 15B is a flowchart showing an example of the operation of the power control device (power control method) in the 14th embodiment of the first embodiment.

[0261] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not always essential that the following operations be performed by the controller 22. The operator may perform some of the operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0262] First, in step S1, power is supplied from the distributed power supply system 10 to the power load 40 of the power consumer.

[0263] Next, in step S2L, a first control for determining the power generation upper limit value of the solar power generation device 31A by multiplying a value increased by multiplying the actual power demand of the power consumer and the total chargeable power below the maximum charge power of the power storage device 32 by a first coefficient γ, or a second control for determining the charge power or discharge power of the power storage device 32 by multiplying a value increased by multiplying the difference between the actual power demand of the power consumer and the actual power generation power of the solar power generation device 31A by a second coefficient δ is executed. Here, the first coefficient γ is larger than the second coefficient δ.

[0264] The "first control" in step S2L can be easily understood from the description of the fifth embodiment, so a detailed description thereof is omitted. The "second control" in step S2L can be easily understood from the description of the seventh embodiment, so a detailed description thereof is omitted.

[0265] In this embodiment, as described above, the first control is executed to determine the power generation upper limit value of the solar power generation device 31A as a value obtained by multiplying a value less than or equal to the sum of the actual power demand of the power consumer and the chargeable power less than or equal to the maximum charge power of the power storage device 32 by the first coefficient γ. Compared with the case where the control is executed to determine the power generation upper limit value of the solar power generation device 31A without increasing the value less than or equal to the sum, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0266] Further, in this embodiment, as described above, the second control is executed to determine the charge power or discharge power of the power storage device 32 as a value obtained by multiplying the difference between the actual power demand of the power consumer and the actual power generation power of the solar power generation device 31A by the second coefficient δ. Compared with the case where the control is executed to determine the charge power or discharge power of the power storage device 32 without increasing the difference, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0267] Here, if it is assumed that the magnitudes of the first coefficient and the second coefficient are equal, the effect of suppressing the power purchase from the power grid in the former first control is likely to be greater than the above effect in the latter second control. This is because, generally, most of the power demand of the power consumer is covered by the supply power from the distributed power generation device 31, and the remaining part is covered by the charge power or discharge power of the power storage device 32. As a result, the power generation power of the solar power generation device 31A tends to be greater than the charge power or discharge power of the power storage device 32.

[0268] Therefore, as in this embodiment, if the first coefficient γ in the first control is made larger than the second coefficient δ in the second control, compared with the case where their magnitudes are equal or the magnitude relationship between them is reversed, the power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0269] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to thirteenth embodiments of the first embodiment except for the above features.

[0270] (Example 15) The power control method of this embodiment is the same as that of the first embodiment, except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0271] FIG. 16A is a diagram showing an example of a distributed power generation device provided in the distributed power system of Example 15 of the first embodiment.

[0272] In the example shown in FIG. 16A, the distributed power generation device 31 includes a fuel cell device 31B. However, since the configuration of the fuel cell device 31B is the same as that of the first embodiment, the description thereof is omitted.

[0273] FIG. 16B is a flowchart showing an example of the operation of the power control device (power control method) in Example 15 of the first embodiment.

[0274] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not always essential for the controller 22 to perform the following operations. The operator may perform some of the following operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0275] When power is supplied from the distributed power system 10 to the power load 40 of the power consumer, if one of the fuel cell device 31B and the power storage device 32 abnormally stops (when "Yes" in step S3A), in step S4A, the first coefficient or the second coefficient used for determining the supply power of the other of the fuel cell device 31B and the power storage device 32 is changed to a value different from that before the abnormal stop. Specifically, when the power storage device 32 abnormally stops, the first coefficient α, the first coefficient β, or the first coefficient γ may be changed so that these coefficients become larger than before the abnormal stop. When the fuel cell device 31B abnormally stops, the first coefficient γ or the second coefficient δ may be changed so that these coefficients become larger than before the abnormal stop. Since the "first coefficient" and the "second coefficient" are the same as above, detailed description is omitted.

[0276] When the distributed power generation device 31 includes the fuel cell device 31B, when one of the fuel cell device 31B and the power storage device 32 abnormally stops, power purchase from the power grid by the distributed power system 10 may occur. Therefore, in this embodiment, when one of the fuel cell device 31B and the power storage device 32 abnormally stops, by changing the first coefficient or the second coefficient used for determining the supply power of the other of the fuel cell device 31B and the power storage device 32 to a desired value different from that before the abnormal stop, compared with the case where these coefficients are the same before and after the abnormal stop, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0277] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to fourteenth examples of the first embodiment except for the above features.

[0278] (Sixteenth Embodiment) The power control method of this embodiment is the same as that of the first embodiment except for the configuration of the distributed power generation device 31 and the control content of the controller 22 described below.

[0279] FIG. 17A is a diagram showing an example of a distributed power generation device provided in the distributed power system of the sixteenth embodiment of the first embodiment.

[0280] In the example shown in FIG. 17A, the distributed power generation device 31 includes the solar power generation device 31A. Since the configuration of the solar power generation device 31A is the same as that of the first embodiment, the description thereof is omitted.

[0281] FIG. 17B is a flowchart showing an example of the operation of the power control device (power control method) in the 16th embodiment of the first embodiment.

[0282] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 (see FIG. 2) of the power control device 20 reads a control program from the storage unit of the controller 22. However, it is not always essential that the following operations be performed by the controller 22. The operator may perform some of these operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0283] When power is supplied from the distributed power system 10 to the power load 40 of the power consumer, if one of the solar power generation device 31A and the power storage device 32 stops abnormally (when "Yes" in step S3B), in step S4B, the first coefficient or the second coefficient used to determine the supply power of the other of the solar power generation device 31A and the power storage device 32 is changed to a value different from that before the abnormal stop. Specifically, when the power storage device 32 stops abnormally, the first coefficient α, the first coefficient β, or the first coefficient γ may be changed so that these coefficients become larger than before the abnormal stop. When the solar power generation device 31A stops abnormally, the first coefficient α, the first coefficient β, or the second coefficient δ may be changed so that these coefficients become larger than before the abnormal stop. The "first coefficient" and the "second coefficient" are the same as those described above, and thus detailed description thereof is omitted.

[0284] When the distributed power generation device 31 includes the solar power generation device 31A, if either the solar power generation device 31A or the power storage device 32 abnormally stops, power purchase from the power grid by the distributed power system 10 may occur. Therefore, in this embodiment, when either the solar power generation device 31A or the power storage device 32 abnormally stops, the first coefficient or the second coefficient used to determine the supply power of the other of the solar power generation device 31A and the power storage device 32 is changed to a desired value different from that before the abnormal stop, so that compared with the case where these coefficients are the same before and after the abnormal stop, power purchase from the power grid by the distributed power system 10 can be appropriately suppressed.

[0285] The power control method, the power control device 20, and the distributed power system 10 of this embodiment may be the same as any of the first embodiment and the first to fifteenth examples of the first embodiment except for the above features.

[0286] (Second Embodiment) [Device Configuration] FIG. 18 is a diagram showing an example of the distributed power system of the second embodiment. In FIG. 18, for convenience, solid lines and broken lines respectively indicate the paths through which power is transmitted and the paths through which signals are transmitted.

[0287] As shown in FIG. 18, the distributed power system 10 of this embodiment includes a power control device 20, a solar power generation device 31A, a fuel cell device 31B, a power storage device 32, and control devices 50A to 50C. That is, in the example shown in FIG. 18, the distributed power generation device 31 includes the solar power generation device 31A and the fuel cell device 31B.

[0288] Here, the configuration within the power control device 20 is the same as that in the first embodiment, so a detailed description is omitted.

[0289] In the example shown in FIG. 18, the photovoltaic power generation device 31A includes a solar cell group composed of a plurality of solar cells including solar panels. This solar cell group is grouped into a plurality by a plurality of solar cells, and the plurality of solar cells within each group are each connected to the power grid via a power conditioner (PCS) and a power meter. This power meter is connected to the power control device 20 via a communication network. The number of solar cells within each group is set to an appropriate value according to the output specifications of the distributed power system 10 and the like.

[0290] The fuel cell device 31B includes a fuel cell unit group composed of a plurality of fuel cell units. This fuel cell unit group is grouped into a plurality by a plurality of fuel cell units, and the plurality of fuel cell units within each group are each connected to the power grid via a power conditioner (PCS) and a power meter. This power meter is connected to the power control device 20 via a communication network. The number of fuel cell units within each group is set to an appropriate value according to the output specifications of the distributed power system 10 and the like.

[0291] Although not shown in the figure, each of these fuel cell units is composed of a fuel cell stack that generates electricity using hydrogen, auxiliary machines such as pumps and valves, and a control device that controls the operation of these devices. When a control device is not provided within the fuel cell unit, the operation of the above devices may be directly controlled by the control device 50A.

[0292] The power storage device 32 includes a power storage unit group composed of a plurality of power storage units. This power storage unit group is grouped into a plurality by a plurality of power storage units, and the plurality of power storage units within each group are each connected to the power grid via a power conditioner (PCS) and a power meter. This power meter is connected to the power control device 20 via a communication network. The number of power storage units within each group is set to an appropriate value according to the output specifications of the distributed power system 10 and the like.

[0293] Furthermore, the photovoltaic power generation device 31A, the fuel cell device 31B, and the power storage device 32 are connected to each other in parallel via the power grid, and are also connected to the power load 40 of the power consumer via a power meter. This power meter is connected to the power control device 20 via a communication network.

[0294] However, the configuration of the distributed power generation system 10 described above is merely an example and is not limited to this example. For example, the fuel cell unit group may be grouped by a plurality of fuel cell units in a single group, or may be grouped by a single fuel cell unit within each group. The solar cell group may be grouped by a plurality of solar cells in a single group, or may be grouped by a single solar cell within each group. The power storage unit group may be grouped by a plurality of power storage battery units in a single group, or may be grouped by a single power storage battery unit within each group.

[0295] The control devices 50A to 50C are respectively provided corresponding to the photovoltaic power generation device 31A, the fuel cell device 31B, and the power storage device 32, and are connected to the power control device 20 via a communication network.

[0296] The control device 50A may control the output of the photovoltaic power generation device 31A by controlling a power conditioner (PCS) via a communication network, or may use the power conditioner (PCS) to disconnect or connect a desired number of solar cells to the power grid.

[0297] Also, the control device 50B may control the output of each of these fuel cell units via a communication network so that efficient operation of the fuel cell units (for example, optimization of the lifespan) becomes possible.

[0298] Also, the control device 50C may control the charging power or discharging power of the power storage device 32 by controlling a power conditioner (PCS) via a communication network.

[0299] However, the above is an example and not limited to this example. For example, the controller 22 (see FIG. 2) of the power control device 20 may directly control the operations of the devices corresponding to each of the control devices 50A to 50C without going through the control devices 50A to 50C. Further, the power control device 20 may be integrated with the control devices 50A to 50C, in other words, may be equipped with the control functions of the control devices 50A to 50C and directly control the operations of the devices corresponding to each of the control devices 50A to 50C.

[0300] The control devices 50A to 50C only need to have a control function, and include an arithmetic processing unit (not shown), a storage unit that stores a control program, and a communicator. By the arithmetic processing unit reading and executing the control program stored in the storage unit, predetermined control is performed in the control devices 50A to 50C. As the arithmetic processing unit, for example, a microprocessor is exemplified. As the storage unit, for example, a memory is exemplified.

[0301] [Operation] FIGS. 19A and 19B are flowcharts showing an example of an operation for determining the generated power of the fuel cell device by the power control device of the second embodiment.

[0302] The following operations may be performed, for example, when the arithmetic processing unit of the controller 22 reads a control program from the storage unit of the controller 22. However, it is not necessarily essential for the controller 22 to perform the following operations. The operator may perform some of the following operations. In the following example, the case where the operations are controlled by the controller 22 will be described.

[0303] Hereinafter, the operation of the power control device 20 in FIG. 19A will be described.

[0304] First, in step S11, the planned value FC of the generated power FC of the fuel cell device 31B is obtained from the power database mainThe state of charge SOC of the power storage device 32, all the demand power D, and all the photovoltaic power generation PV during the sampling period (TD) are acquired. Note that the sampling period (TD) is set to be shorter than a predetermined time (T) described later. Also, as the "sampling period", for example, about 15 minutes can be cited, but it is not limited to this.

[0305] Then, in step S12, the moving average value D of the demand power D during the sampling period av e and the moving average value PV of the photovoltaic power generation PV ave are calculated.

[0306] Next, in step S13, the charging power or discharging power B of the power storage device 32 pre1 is calculated by the following formula (1). B pre1 =D ave -(PV ave +FC main )···(1)

[0307] Note that when B pre1 >0, it means the discharging power of the power storage device 32, and when B pre1 <0, it means the charging power of the power storage device 32.

[0308] Next, in step S14, the state of charge SOC of the power storage device 32 after elapse of the predetermined time (T) lato r is calculated by the following formula (2). Here, the predetermined time (T) may be about 60 minutes but is not limited to this. SOC lator =SOC-(B pre1 ×T) / Power storage device capacity···(2)

[0309] Next, in step S15A, it is determined whether the state of charge SOC lator is greater than the upper limit value SOC upper .

[0310] The state of charge SOClator is the upper limit SOC upper If it is greater than (when "Yes" in step S15A), in step S16A, the charging power or discharging power B of the power storage device 32 that satisfies the following formula (3A) pre2 is calculated. SOC upper = SOC - (B pre2 × T) / power storage device capacity ··· (3A)

[0311] Note that when B pre2 > 0, it means the discharging power of the power storage device 32, and when B pre2 < 0, it means the charging power of the power storage device 32.

[0312] Next, in step S17A, the correction value FC of the power generation power FC of the fuel cell device 31B that satisfies the following formula (4A) sub is calculated (FC sub < 0). B pre2 = D ave - (PV ave + FC main + FC sub ) ··· (4A)

[0313] And in step S18A, the power generation power FC of the fuel cell device 31B is calculated by the following formula (5A), and the power generation power FC is commanded. FC = FC main + FC sub ··· (5A)

[0314] On the other hand, when the charge rate SOC lator is not greater than the upper limit SOC upper (when "No" in step S15A), the power generation power FC of the fuel cell device 31B remains in its original state. Note that in the above, FC sub is determined to be equal to the charge rate SOC lator and the upper limit SOC upper but is not limited to this. The charge rate SOC is determined so that FC lator is less than the upper limit SOC u pper but is not limited to this. So that FC submay be determined.

[0315] Hereinafter, the operation of the power control device 20 in FIG. 19B will be described.

[0316] Note that steps S11 - S14 in FIG. 19B are the same as steps S11 - S14 in FIG. 19A, so the description thereof is omitted.

[0317] In step S15B, it is determined whether the state of charge SOC lator is less than the lower limit value SOC lower or not.

[0318] If the state of charge SOC lator is less than the lower limit value SOC lower (when "Yes" in step S15B), in step S16B, the charging power or discharging power B of the power storage device 32 that satisfies the following formula (3B) pre2 is calculated. SOC lower = SOC - (B pre2 × T) / power storage device capacity ··· (3B)

[0319] Next, in step S17B, the correction value FC of the power generation power FC of the fuel cell device 31B that satisfies the following formula (4B) sub is calculated (FC sub > 0). B pre2 = D ave - (PV ave + FC main + FC sub ) ··· (4B)

[0320] Then, in step S18B, the power generation power FC of the fuel cell device 31B is calculated by the following formula (5B), and the power generation power FC is commanded. FC = FC main + FC sub ··· (5B)

[0321] On the other hand, when the state of charge SOC lator is the lower limit value SOC lowerIf it is not less than that (when "No" in step S15B), the generated power FC of the fuel cell device 31B is maintained as it is. In the above, FC sub is the state of charge SOC lator and the lower limit value SOC lower are determined to be equal but is not limited thereto. The state of charge SOC lator is the lower limit value SOC l ower FC may be determined to be greater than sub .

[0322] According to the present embodiment described above, an example of the "correction value" in the second embodiment of the first embodiment (correction value FC sub ) is derived as described above. Also, in each of the above arithmetic expressions , PV ave is set to zero (PV ave = 0), and an example of the "correction value" in the third embodiment of the first embodiment (correction value FC sub ) is derived.

[0323] The power control method, the power control device 20, and the distributed power system 10 of the present embodiment may be the same as any of the first embodiment and the first to sixteenth embodiments of the first embodiment except for the above features.

[0324] The first embodiment, the first to sixteenth embodiments of the first embodiment, and the second embodiment may be combined with each other as long as they do not exclude each other. From the above description, many improvements and other embodiments of the present disclosure will be apparent to those skilled in the art. Therefore, the above description should be construed as illustrative only and provided for the purpose of teaching those skilled in the art the best mode of carrying out the present disclosure. Without departing from the spirit of the present disclosure, the details of its structure and / or function can be substantially changed.

Industrial Applicability

[0325] One aspect of the present disclosure can be used in a power control method, a power control device, and a distributed power system that can reduce the possibility of power purchase from a power grid more than before.

Explanation of Signs

[0326] 10: Distributed power system 20: Power control device 21: Memory 22: Controller 31: Distributed power generation device 31A: Solar power generation device 31B: Fuel cell device 32: Power storage device 40: Power load 50A: Control device 50B: Control device 50C: Control device α: First coefficient β: First coefficient γ: First coefficient δ: Second coefficient

Claims

1. A power control method for supplying power to a power load of a power consumer from a distributed power generation system including a distributed power generation device and a power storage device, the method determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, the method comprising: the distributed power generation system includes a solar power generation system and a fuel cell system; A power control method for determining a planned value of the power generation power of the fuel cell device so as to satisfy the difference between a value obtained by multiplying a predicted value or actual demand power of the power consumer by the first coefficient α and a predicted value or actual generated power of the solar power generation device.

2. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a solar power generation system and a fuel cell system; A power control method in which the power generation power of the fuel cell device is determined as a value obtained by multiplying the first coefficient β by adding a planned value of the power generation power of the fuel cell device to a correction value of the planned value based on the actual power demand of the power consumer, the actual power generation power of the solar power generation device, and the planned value of the power generation power of the fuel cell device.

3. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a fuel cell system; A power control method in which the power generation power of the fuel cell device is determined to be a value obtained by multiplying the first coefficient β by adding a planned value of the power generation power of the fuel cell device to a correction value of the planned value based on the actual power demand of the power consumer and the planned value of the power generation power of the fuel cell device.

4. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a solar power generation system and a fuel cell system; a power control method for determining, as an upper power generation limit value of the solar power generation device, a value equal to or smaller than the difference between the sum of the actual power demand of the power consumer and the chargeable power equal to or smaller than the maximum charging power of the storage device, and the actual power generation power of the fuel cell device, multiplied by the first coefficient γ and increased.

5. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation device includes a solar power generation device; a power control method for determining, as a power generation upper limit value of the solar power generation device, a value equal to or smaller than the sum of the actual power demand of the power consumer and the chargeable power equal to or smaller than the maximum charging power of the storage device, multiplied by the first coefficient γ and increased.

6. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a solar power generation system and a fuel cell system; a difference between the actual power demand of the power consumer and the sum of the actual power generated by a solar power generation device and an actual power generated by a fuel cell device, multiplied by a second coefficient δ and increased to determine the charging power or discharging power of the power storage device.

7. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation device includes a solar power generation device; a difference between an actual power demand of the power consumer and an actual power generated by a photovoltaic power generation device is multiplied by a second coefficient δ and the increased value is determined as the charging power or discharging power of the power storage device.

8. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a fuel cell system; a difference between an actual power demand of the power consumer and an actual power generated by a fuel cell device is multiplied by a second coefficient δ and the increased value is determined as the charging power or discharging power of the power storage device.

9. The power control method according to any one of claims 1 to 5, wherein the first coefficient varies depending on the season.

10. The power control method according to any one of claims 6 to 8, wherein the second coefficient varies depending on the season.

11. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a solar power generation system and a fuel cell system; a first control in which the power generation power of the fuel cell device is determined to be a value obtained by multiplying the first coefficient β by adding a correction value of the planned value based on the actual power demand of the power consumer, the actual power generation power of the solar power generation device, and the planned value of the power generation power of the fuel cell device to the planned value of the power generation power of the fuel cell device, or execute a second control in which a difference between an actual demand power of the power consumer and a sum of an actual generated power of the photovoltaic power generation device and an actual generated power of the fuel cell device is multiplied by a second coefficient δ and increased to determine a charging power or discharging power of the power storage device; The power control method according to claim 1, wherein the first coefficient β is greater than the second coefficient δ.

12. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a fuel cell system; a first control in which a value obtained by multiplying a planned value of the power generation power of the fuel cell device by a correction value of the planned value based on the actual power demand of the power consumer and the planned value of the power generation power of the fuel cell device and correcting the plan value by the first coefficient β is determined as the power generation power of the fuel cell device; or execute a second control in which a value obtained by multiplying a difference between an actual power demand of the power consumer and an actual power generated by the fuel cell device by a second coefficient δ and increasing the value is determined as the charging power or discharging power of the power storage device; The power control method according to claim 1, wherein the first coefficient β is greater than the second coefficient δ.

13. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a solar power generation system and a fuel cell system; a first control in which a value equal to or less than a difference between the sum of the actual power demand of the power consumer and the chargeable power equal to or less than the maximum charging power of the power storage device, and the actual power generated by the fuel cell device is multiplied by the first coefficient γ and increased to determine the power generation upper limit value of the solar power generation device; or execute a second control in which a difference between an actual demand power of the power consumer and a sum of an actual generated power of the photovoltaic power generation device and an actual generated power of the fuel cell device is multiplied by a second coefficient δ and increased to determine a charging power or discharging power of the power storage device; The power control method, wherein the first coefficient γ is greater than the second coefficient δ.

14. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation device includes a solar power generation device; A first control in which a value equal to or less than the sum of the actual demand power of the power consumer and the chargeable power equal to or less than the maximum charge power of the power storage device is multiplied by the first coefficient γ and increased to determine the power generation upper limit value of the solar power generation device; or execute a second control in which a value obtained by multiplying a difference between an actual power demand of the power consumer and an actual power generated by the photovoltaic power generation device by a second coefficient δ and increasing the value is determined as the charging power or discharging power of the power storage device; The power control method, wherein the first coefficient γ is greater than the second coefficient δ.

15. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation system includes a fuel cell system; A power control method in which, when one of the fuel cell device and the power storage device stops abnormally, the first coefficient or the second coefficient used to determine the supply power of the other of the fuel cell device and the power storage device is changed to a value different from that before the abnormal stop.

16. A power control method, when supplying power to a power load of a power consumer from a distributed power supply system including a distributed power generation device and a power storage device, determining a supply power of the distributed power generation device using a first coefficient so that the supply power of the distributed power generation device is greater than a demand power of the power consumer, comprising: the distributed power generation device includes a solar power generation device; A power control method in which, when one of the solar power generation device and the power storage device abnormally stops, the first coefficient or the second coefficient used in determining the power supply to the other of the solar power generation device and the power storage device is changed to a value different from that before the abnormal stop.

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