Supply-demand management device, supply-demand management method, and program

Abstract

To provide a supply-demand management device that can appropriately manage a storage battery system etc.SOLUTION: A supply-demand management device 100 comprises: a supply-demand monitoring unit 103 for acquiring a power generation amount actual value PS from a to-be-managed power supply connected to a power system, and further acquiring a charge / discharge amount actual value PB from a storage battery system connected to the power system; and a charge / discharge amount determination unit 107 for outputting a charge / discharge command value PBA to the storage battery system using a second power generation amount that is a result acquired by subtracting a demand amount for alleviating heat capacity constraints, which is a demand amount for alleviating the constraints of heat capacity in the power system, from a first power generation amount, which is a power generation amount of the to-be-managed power supply.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a supply-demand management device, a supply-demand management method, and a program.

Background Art

[0002] As background art in this technical field, the summary of Patent Document 1 below states that, "In an embodiment of the present invention, when managing the power supply-demand state of a group of consumers consisting of a plurality of consumers, where one or more consumers have power storage facilities, a computer classifies each consumer into a first group of consumers who are selling power to the grid or a second group of consumers who are buying power from the grid according to information indicating whether each consumer in the group of consumers is selling power to the grid or buying power from the grid. The difference between the planned power value and the predicted actual power generation value of the power generation plan of the first group of consumers is calculated, and the charge-discharge power of each power storage facility owned by each consumer classified into the first group of consumers is controlled according to the difference. At the same time, the difference between the planned power value and the predicted actual power consumption value of the power consumption plan of the second group of consumers is calculated, and the charge-discharge power of each power storage facility owned by each consumer classified into the second group of consumers is controlled according to the difference. This is a method for operating a storage battery."

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above-described technology, there is a desire to manage a storage battery system or the like more appropriately. This invention has been made in view of the above circumstances, and an object thereof is to provide a supply-demand management device, a supply-demand management method, and a program that can appropriately manage a storage battery system or the like.

Means for Solving the Problems

[0005] To solve the above problems, the supply-demand management device of the present invention includes a supply-demand monitoring unit that acquires the actual power generation value from a power source to be managed connected to the power grid and acquires the actual charge / discharge value from a battery system connected to the power grid, and a second power generation amount that is the result of subtracting the heat capacity constraint relaxation demand, which is the demand for relaxing the heat capacity constraint in the power grid, from the first power generation amount, which is the power generation amount of the power source to be managed. so that the value at the time of supply and demand planning matches the value at the time of actual supply and demand and a charge / discharge amount determination unit that outputs a charge / discharge command value for the battery system, and is characterized by comprising the above.

Effect of the Invention

[0006] According to the present invention, a battery system or the like can be appropriately managed.

Brief Description of the Drawings

[0007]

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Mode for Carrying Out the Invention

[0008] [Overview of the Embodiment] In recent power system reforms, a system called the Feed-in Premium (FIP) system has been implemented, in which power generators, which are operators that own or operate renewable energy power sources (hereinafter sometimes referred to as RE power sources), can sell the power generated by the RE power sources to retailers and others in the wholesale power market. In the FIP system, the difference between the planned generation value of the traded RE power source and the actual generation amount, which is the actual generation amount, is called the generation imbalance. The generation imbalance is managed by the power generator and settled by the power generator at a later date when the actual supply and demand occur. That is, the power generator bears the imbalance risk.

[0009] On the other hand, with the spread of RE power sources, the number of power systems that are difficult to connect (or intertie) new RE power sources using conventional power system connection (or intertie) methods is increasing. As one solution, the application of a non-firm type connection, that is, a method that allows new connections of RE power sources on the premise of suppressing the output during system congestion hours, which is a time period when the thermal capacity constraint of the system becomes severe, is progressing. However, even when the output is suppressed based on the non-firm type connection, the imbalance risk for the suppressed output is not compensated and must be borne by the power generator. Therefore, the embodiment described below aims to achieve both relaxation of the thermal capacity constraint of the power system due to the connection of new RE power sources and reduction of the generation imbalance of RE power sources.

[0010] Applying the content of Patent Document 1 described above, it is considered possible to reduce imbalance using a battery system. However, Patent Document 1 does not describe considering the heat capacity constraint. Therefore, according to the technology applying Patent Document 1, when output suppression occurs in a non-firm connection, the discharge amount of the battery system cannot be increased, and as a result, imbalance will occur. To avoid output suppression, for example, a system battery can be used to create demand to absorb the generated power during system congestion periods. However, in this method, a new battery system is required, and the associated cost (hereinafter referred to as battery cost) will increase.

[0011] Therefore, the embodiment described below is a battery system that reduces the power generation imbalance of a RE power source, and determines the charge and discharge amount using a virtual power generation amount obtained by subtracting the heat capacity constraint relaxation demand, which is the demand for relaxing the heat capacity constraint, from the RE power generation amount. Thus, according to the embodiment described below, while relaxing the heat capacity constraint caused by the RE power generation amount, the power generation imbalance of the RE power source to be managed can be reduced, so that the cost of a new connection of the RE power source and the battery cost required for reducing the power generation imbalance can be reduced.

[0012] [First Embodiment] 〈Configuration of the First Embodiment〉 FIG. 1 is a block diagram showing an example of the facility configuration of the power system 1 according to the first embodiment. In FIG. 1, the power system 1 includes a power grid 20, a RE power source 31 (power source to be managed), a battery system 32, trading meters 34-1 and 34-2, and a supply-demand management device 100. Here, since the RE power source 31 is mainly managed by the supply-demand management device 100, it may be hereinafter referred to as the "power source to be managed". The RE power source 31 and the battery system 32 constitute one balancing group 30. That is, the power generation operator trades the total amount of power input and output by the balancing group 30 in the wholesale power market.

[0013] In the power system 20, an RE power source 31 and a battery system 32 are connected via trading meters 34-1 and 34-2. In the following description, when there are a plurality of components, information, etc. having the same or similar functions and meanings, the same reference numeral may be appended with "-" and a numerical value, and may be expressed as, for example, "trading meters 34-1 and 34-2". However, when it is not necessary to distinguish these plurality of components, etc., the "-" and the numerical value may be omitted, and may be expressed as, for example, "trading meter 34".

[0014] In the example of FIG. 1, the RE power source 31 includes a photovoltaic power generation unit 31a that generates DC power from sunlight, and a power converter 31b that converts the DC power into AC power and outputs it to the power system 20. The battery system 32 includes a battery 32a that inputs and outputs DC power, and a power converter 32b that bidirectionally converts the DC power and the AC power of the power system 20.

[0015] The trading meter 34-1 supplies the actual power generation value PS output by the RE power source 31 to the demand-supply management device 100. Here, the "power generation amount" means the "electric energy amount" within a predetermined time. The trading meter 34-2 supplies the actual charge / discharge amount value PB, which is the electric energy amount output by the battery system 32, to the demand-supply management device 100. Here, the actual charge / discharge amount value PB is a value that becomes a positive value when the battery 32a discharges and a negative value when it charges. Based on the actual power generation value PS and the actual charge / discharge amount value PB, the demand-supply management device 100 calculates predicted values, etc. thereof, and based on the result, outputs a power generation upper limit command value PSA and a charge / discharge command value PBA to the balancing group 30. Here, the power generation upper limit command value PSA is a command value that commands the upper limit of the actual power generation value PS, and the charge / discharge command value PBA is a command value of the actual charge / discharge amount value PB.

[0016] FIG. 2 is a block diagram of a computer 900. The demand-supply management device 100 shown in FIG. 1 includes one or a plurality of the computers 900 shown in FIG. 2. In FIG. 2, the computer 900 includes a CPU 901, a RAM 902, a ROM 903, an HDD 904, a communication I / F 905, an input / output I / F 906, and a media I / F 907. The communication I / F 905 is connected to a communication circuit 915. The input / output I / F 906 is connected to an input / output device 916. The media I / F 907 reads and writes data from / to a recording medium 917. The ROM 903 stores a control program executed by the CPU, various data, etc. The CPU 901 realizes various functions by executing an application program read into the RAM 902.

[0017] FIG. 3 is a block diagram showing the functions of the supply-demand management device 100 according to the first embodiment. Each block in FIG. 3 represents a function realized by an application program or the like. That is, the supply-demand management device 100 includes an interconnection contract management unit 101, a database 102, a supply-demand monitoring unit 103 (supply-demand monitoring means), a power generation prediction unit 104, a DER planning unit 105, a market trading unit 106, and a DER control unit 107 (charge / discharge amount determination unit, charge / discharge amount determination means). Here, the interconnection contract management unit 101 stores the contract details regarding RE interconnection agreed upon in the grid interconnection agreement. The contract details particularly include the presence or absence of a non-firm type interconnection, the grid congestion time zone, and the degree of influence on the heat capacity constraint to be complied with.

[0018] The database 102 stores the above contract details, etc. The supply-demand monitoring unit 103 collects the actual power generation value PS, the actual charge / discharge amount value PB, etc. via the communication circuit 915 and the communication I / F 905 (see FIG. 2) and stores them in the database 102. The power generation prediction unit 104 calculates a power generation prediction value PS1, a charge / discharge amount prediction value PB1, and a virtual power generation prediction value PG1 which is the sum of these based on the actual power generation value PS and the actual charge / discharge amount value PB stored in the database 102, and stores the result in the database 102.

[0019] The DER planning department 105 formulates the pre-trade power generation plan value PS2 of the RE power source 31 (see FIG. 1) and the pre-trade charge / discharge plan value PB2 of the battery system 32 (see FIG. 1) based on the predicted virtual power generation value PG1 and the degree of influence on the heat capacity constraint to be complied with, etc., and saves the results in the database 102. The market trading department 106 trades in the wholesale power market according to the pre-trade power generation plan value PS2 and the pre-trade charge / discharge plan value PB2, and creates a power generation plan value PS3 and a charge / discharge plan value PB3 based on the trading results.

[0020] In addition, the market trading department 106 calculates the virtual power generation plan value PG3, which is the total value of the power generation plan value PS3 and the charge / discharge plan value PB3. Then, the market trading department 106 saves the power generation plan value PS3, the charge / discharge plan value PB3, and the virtual power generation plan value PG3 in the database 102. The DER control unit 107 outputs a power generation upper limit command value PSA and a charge / discharge command value PBA based on the power generation plan value PS3, the charge / discharge plan value PB3, and the virtual power generation plan value PG3.

[0021] Here, to clarify the features of the present embodiment, a comparative example will be described. FIG. 4 is a diagram showing an example of the power supply-demand relationship at the time of planning of the supply-demand management method according to the comparative example. In FIG. 4, the power grid 20 includes a lower-level grid 21, an upper-level grid 22, and a transformer 24 connecting the two. The lower-level grid 21 is connected to a balancing group 30, a battery system 50, and a demand area 60.

[0022] The battery system 50 is configured in the same manner as the battery system 32 (see FIG. 1). That is, the battery system 50 includes a battery 52, a power converter (not shown), and a trading meter 54. The demand area 60 includes a plurality of consumers who consume the power generated in the balancing group 30.

[0023] The power generation company connects the RE power source 31 and the battery system 32 to the lower-level system 21 of the power grid 20. In the upper-level system 22 of the power grid 20, a power flow 28 is generated by subtracting the demand from the power generation amount. It is planned that when this power flow 28 becomes excessive during the grid congestion time period, a limit on the amount of power that can be transmitted, that is, a thermal capacity constraint 26, will occur during the grid congestion time period.

[0024] As shown in FIG. 4, assume that the charge / discharge planned value PB3 is 0 [kWh] and the power generation planned value PS3 is 400 [kWh]. Then, the virtual power generation planned value PG3 (not shown in the figure), which is the sum thereof, becomes 400 [kWh]. The power transmission and distribution company operating this power grid 20 purchases regulation power in the regional regulation power market, for example, to avoid output suppression in the non-firm connection. In the example shown in the figure, when the thermal capacity constraint 26 occurs, it is planned to charge the battery system 50 to create a demand PN3 of -400 [kWh] to relieve the thermal capacity constraint during the grid congestion time period.

[0025] FIG. 5 is a diagram showing an example of the power supply and demand relationship at the actual supply and demand time of the supply and demand management method according to the comparative example. As shown in FIG. 4, the power generation planned value PS3 of the RE power source 31 was 400 [kWh]. However, for example, due to sudden weather changes, assume that the actual power generation value PS at the actual supply and demand time becomes 100 [kWh] as shown in FIG. 5. Then, in order for the power generation company to match the sum of the actual charge / discharge value PB and the actual power generation value PS to the virtual power generation planned value PG3 = 400 [kWh] at the planning time, it is common to set the actual charge / discharge value PB to 300 [kWh] as shown in the figure.

[0026] On the other hand, the power transmission and distribution company generates a demand PN of 400 [kWh], which is the same value as the demand PN3 at the planning time. As a result, in the state shown in FIG. 5, charge and discharge will be performed in both the battery systems 32 and 52. Therefore, there has been a problem that the combined scale of the required battery systems 32 and 52 becomes large and the power loss due to charge and discharge also becomes large.

[0027] FIG. 6 is a diagram showing an example of the power supply-demand relationship at the time of planning in the supply-demand management method according to the first embodiment. In this embodiment, the power generation company connects the RE power source 31 and the battery system 32 to the lower system 21 of the power grid 20. In the upper system 22 of the power grid 20, it is planned that the heat capacity constraint 26 will occur during the system congestion time period as in the example shown in FIG. 4. Also, assume that the power generation planned value PS3 for the system congestion time period is 400 [kWh].

[0028] In this embodiment, in order to avoid output suppression in the non-firm connection, the power generation company has contracted with the power transmission and distribution company in the connection agreement to create a demand of 400 [kWh] by the battery system 32 during the system congestion time period. Therefore, the charge / discharge planned value PB3 becomes -400 [kWh] as shown in the figure. And the virtual power generation planned value PG3 at the time of supply-demand planning is the sum of the power generation planned value PS3 and the charge / discharge planned value PB3, that is, 0 [kWh].

[0029] FIG. 7 is a diagram showing an example of the power supply-demand relationship at the time of actual supply-demand in the supply-demand management method according to the first embodiment. As shown in FIG. 6, the power generation planned value PS3 of the RE power source 31 was 400 [kWh]. However, for example, due to sudden weather changes, assume that the actual power generation value PS at the time of actual supply-demand becomes 100 [kWh] as shown in FIG. 7. Then, in order for the power generation company to match the sum of the charge / discharge actual value PB and the power generation actual value PS to the virtual power generation planned value PG3 = 0 [kWh] at the time of planning, the charge / discharge actual value PB is set to -100 [kWh]. Thereby, the virtual power generation PG can be made to coincide with the virtual power generation planned value PG3.

[0030] FIG. 8 is a diagram showing examples of the tables TB1, TB2, and TB3 recorded in the database 102. These tables TB1, TB2, and TB3 show various control patterns. These tables have, horizontally, a supply and demand planning time column 71, an actual supply and demand time column 72, a flexibility column 73, and an imbalance column 74. Here, the flexibility column 73 indicates the amount of power generation to be flexed, and the imbalance column 74 indicates the imbalance in power generation. Also, these tables have, vertically, a RE power generation column 75 (first power generation amount), a heat capacity constraint relaxation demand column 76 (heat capacity constraint relaxation demand), and a virtual power generation column 77 (second power generation amount). The names of these columns may sometimes be simply denoted as "column".

[0031] Table TB1 shows the control pattern corresponding to FIGS. 6 and 7. First, at the supply and demand planning time (column 71), the RE power generation (column 75) is the power generation planned value PS3 = 400 [kWh]. And the heat capacity constraint relaxation demand (column 76) is 400 [kWh] equal to the power generation planned value PS3. Therefore, it can be regarded that the impact degree PE on the heat capacity constraint 26 of the upper system 22 (see FIG. 6) of the power generation amount obtained by subtracting the heat capacity constraint relaxation demand from the RE power generation is 0 [kWh].

[0032] And the demand-side management device 100 (see FIG. 3) controls the battery system 32 (see FIG. 6) so that the virtual power generation (column 77) matches (i.e., becomes 0 [kWh]) at the supply and demand planning time (column 71) and the actual supply and demand time (column 72). For this reason, in accordance with the variation 502 of the RE power generation (column 75), a similar variation 503 occurs in the heat capacity constraint relaxation demand (column 76).

[0033] As a result, also at the actual supply and demand time (column 72), the impact degree PE on the heat capacity constraint 26 of the upper system 22 becomes 0 [kWh], and the heat capacity constraint 26 can be relaxed to the same extent as at the supply and demand planning time. Also, the power generation amount (-300 [kWh]) generated by the variation 503 of the heat capacity constraint relaxation demand (column 76) becomes the amount of power (300 [kWh]) of the flexibility 504 with respect to the RE power generation (column 75). Thereby, the power generation imbalance occurring in the balancing group 30 (see FIGS. 6 and 7) can be reduced.

[0034] By performing such control, as shown in FIGS. 6 and 7, it is possible to reduce the power generation imbalance of the RE power source 31 while relaxing the heat capacity constraint 26 caused by the RE power generation amount (column 75) using a single battery system 32. As a result, it is possible to reduce the battery cost required for the new connection of the RE power source 31 and the reduction of imbalance.

[0035] In the control pattern shown in Table TB1, the influence degree PE on the heat capacity constraint 26 of the upper system 22 was 0 [kWh]. However, for example, there may be cases where the power generation operator can relax the influence on the heat capacity constraint 26 caused by the RE power generation amount (column 75) to a certain level in accordance with the connection agreement. Specific examples thereof are shown in Tables TB2 and TB3. Tables TB2 and TB3 show examples of control patterns in which the influence degree PE on the heat capacity constraint 26 is relaxed to 100 [kWh] and -100 [kWh], respectively.

[0036] In the supply and demand planning column 71 and the actual supply and demand column 72 of Tables TB2 and TB3, the heat capacity constraint relaxation demand (column 76) is the magnitude obtained by subtracting the influence degree PE from the RE power generation amount (column 75). Specifically, in the case of Table TB2, the heat capacity constraint relaxation demand (column 76) is 300 [kWh] (= 400 - 100 [kWh]), and in the case of Table TB3, the heat capacity constraint relaxation demand (column 76) is 500 [kWh] (= 400 + 100 [kWh]).

[0037] Using this heat capacity constraint relaxation demand (column 76), it is advisable to control the battery system 32 (see FIGS. 6 and 7) so that the virtual power generation amount (column 77) does not change. When the influence degree PE is set larger than 0 [kWh] as in Table TB2, the influence on the heat capacity constraint 26 caused by the RE power source 31 can be partially relaxed. Also, when the influence degree PE is set smaller than 0 [kWh] as in Table TB3, it becomes possible to relax the influence on the heat capacity constraint 26 caused by an RE power source (not shown) outside the management target connected to the same upper system 22 (see FIGS. 6 and 7).

[0038] FIG. 9 is a flowchart of the transaction process executed by the supply-demand management device 100. That is, FIG. 9 shows the planning / re-planning flow when a power generation company trades the total measured values of a plurality of transaction meters 34 (see FIG. 1) in the wholesale power market. Since the power generation company trades multiple times for the power generation amount at the same supply-demand time, the plans after the second time are called re-plans. When the process proceeds to step S12 in FIG. 9, the power generation amount prediction unit 104 (see FIG. 3) uses the past actual power generation amount value PS stored in the database 102, the power generation prediction model D32 in numerical calculation, and the weather forecast value D33 such as solar radiation amount, to predict the power generation amount of the RE power source 31 (see FIG. 1), which is the power source to be managed. Then, this prediction result is stored in the database 102 as the predicted power generation amount value PS1.

[0039] Next, when the process proceeds to step S14, the DER planning unit 105 uses the predicted power generation amount value PS1, the influence degree PE on the heat capacity constraint to be complied with (heat capacity constraint influence degree), and the battery state D42 such as the remaining battery amount and the remaining battery life, to formulate the pre-trade power generation plan value PS2 and the pre-trade charge / discharge plan value PB2, and stores them in the database 102.

[0040] Next, when the process proceeds to step S16, the market trading unit 106 trades in the wholesale power market according to the pre-trade power generation plan value PS2 and the pre-trade charge / discharge plan value PB2, and based on the trading result, creates the power generation plan value PS3, the charge / discharge plan value PB3, and calculates the virtual power generation amount plan value PG3. Then, the market trading unit 106 stores these power generation plan value PS3, charge / discharge plan value PB3, and virtual power generation amount plan value PG3 in the database 102.

[0041] FIG. 10 is a flowchart of the control program at the actual supply-demand time. Note that this control program is executed by the DER control unit 107 at a predetermined control cycle TC of about 1 minute to 15 minutes, for example. When the process proceeds to step S21 (supply and demand monitoring process) in FIG. 10, the supply and demand monitoring unit 103 acquires the actual power generation value PS and the actual charge / discharge amount value PB for each control cycle TC. Next, when the process proceeds to step S22 (charge / discharge amount determination process), the DER control unit 107 formulates an imbalance reduction plan based on the virtual power generation planned value PG3, the actual power generation value PS, and the actual charge / discharge amount value PB for each control cycle TC.

[0042] Here, the "imbalance reduction plan" is to plan the charge / discharge command value PBA and the power generation upper limit command value PSA for each control cycle regarding the trading settlement unit period TP of about 30 minutes at the actual supply and demand time. Here, the power generation upper limit command value PSA is a control command value for restricting the output of the RE power source 31 to that value or less. For example, when the battery system 32 cannot sufficiently secure the system constraint relaxation demand due to the constraint of the remaining battery amount in the battery system 32, the actual power generation value PS can be suppressed by this power generation upper limit command value PSA.

[0043] Next, when the process proceeds to step S24, the DER control unit 107 performs supply and demand control. That is, the DER control unit 107 remotely controls the RE power source 31 and the battery system 32 based on the charge / discharge command value PBA and the power generation upper limit command value PSA. Next, when the process proceeds to step S26, the supply and demand monitoring unit 103 stores the actual power generation value PS and the actual charge / discharge amount value PB in the database 102 for the trading settlement unit period TP to which the current time, that is, the actual supply and demand time, belongs. Thus, the processing of this control program in the current control cycle TC is completed.

[0044] The power generation operator calculates the virtual power generation PG in the whole balancing group 30 (see FIG. 1) based on the stored actual power generation value PS and the actual charge / discharge amount value PB, and clears the power generation imbalance at a later date based on this virtual power generation PG. By performing the control as described above, the DER control unit 107 can perform feed-forward control and can efficiently reduce the power generation imbalance.

[0045] [Second Embodiment] FIG. 11 is a block diagram showing an example of the facility configuration of the power system 2 according to the second embodiment. In FIG. 11, the power system 2 includes a power grid 20, a plurality of (n) RE power sources 31-1 to 31-n, a battery system 32, a plurality of (n + 1) trading meters 34-1 to 34-(n + 1), and a supply-demand management device 100.

[0046] In the present embodiment, the plurality of RE power sources 31-1 to 31-n are power sources to be managed, and the plurality of RE power sources 31-1 to 31-n and the battery system 32 constitute one balancing group 30. The configuration of the power system 2 other than that described above is the same as that of the power system 1 of the first embodiment (see FIG. 1). Therefore, also in the present embodiment, the supply-demand management device 100 can calculate the virtual power generation planned value PG3 in the same manner as in the first embodiment.

[0047] [Effects of the Embodiment] According to the above-described embodiment, the supply-demand management device 100 includes a supply-demand monitoring unit 103 that acquires the actual power generation value PS from the power source to be managed (31) connected to the power grid 20 and acquires the actual charge / discharge amount value PB from the battery system 32 connected to the power grid 20, and a charge / discharge amount determination unit (107) that outputs a charge / discharge command value PBA for the battery system 32 using a second power generation amount (77) which is the result of subtracting the heat capacity constraint relaxation demand (76), which is the demand for relaxing the heat capacity constraint in the power grid 20, from the first power generation amount (75) which is the power generation amount of the power source to be managed (31). Thereby, according to the present embodiment, the battery system 32 etc. can be appropriately managed corresponding to the heat capacity constraint relaxation demand (76).

[0048] Further, it is more preferable that the power source to be managed (31) is a renewable energy power source that generates power by sunlight, wind power, wave power, tidal power, running water, geothermal energy, or biomass. Thereby, renewable energy can be effectively utilized.

[0049] Also, when a plurality of power sources to be managed (31) are provided as in the second embodiment, it is more preferable that the battery system 32 functions as a common demand for relaxing the generation imbalance of the plurality of power sources to be managed (31) in order to relax the heat capacity constraint. Thereby, corresponding to the plurality of power sources to be managed (31), the battery system 32 etc. can be appropriately managed corresponding to the heat capacity constraint relaxation demand (76).

[0050] [Modification Example] The present invention is not limited to the above-described embodiments, and various modifications are possible. The above-described embodiments are exemplified for easy understanding and explanation of the present invention, and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Also, a part of the configuration of each embodiment can be deleted, or other configurations can be added or replaced. Also, the control lines and information lines shown in the figures indicate those considered necessary for explanation, and do not necessarily show all the control lines and information lines required in the product. In practice, it may be considered that almost all the configurations are interconnected. Possible modifications to the above embodiments are, for example, as follows.

[0051] (1) In each of the above embodiments, the RE power source 31 generated electric power by sunlight. However, the RE power source 31 may be a power source that generates electric power by renewable energy other than sunlight, such as wind power, wave power, tidal power, running water, geothermal energy, or biomass.

[0052] (2) Also, in each of the above embodiments, an example in which the RE power source 31 is applied as the power source to be managed has been described. However, the power source to be managed may be a power source other than the RE power source.

[0053] (3) Since the hardware of the supply-demand management device 100 in the above embodiment can be realized by a general computer, a program for executing the flowcharts shown in FIGS. 9 and 10 and other various processes described above may be stored in a storage medium or distributed via a transmission line.

[0054] (4) The processes shown in FIGS. 9 and 10 and other processes described above were described as software processes using a program in the above embodiment, but part or all of them may be replaced with hardware processes using an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0055] (5) The various processes executed in the above embodiment may be executed by a server computer via a network (not shown), and various data stored in the above embodiment may also be stored in the server computer.

Explanation of Reference Numerals

[0056] 20 Power system 31 RE power source (power source to be managed) 32 Battery system 75 RE power generation amount column (first power generation amount) 76 Heat capacity constraint relaxation demand column (heat capacity constraint relaxation demand) 77 Virtual power generation amount column (second power generation amount) 100 Supply-demand management device 103 Supply-demand monitoring unit (supply-demand monitoring means) 107 DER control unit (charge / discharge amount determination unit, charge / discharge amount determination means) 900 Computer PB Charge / discharge amount actual value PS Power generation amount actual value PBA Charge / discharge command value S21 Step (supply-demand monitoring process) S22 Step (charge / discharge amount determination process)

Claims

1. A supply - demand monitoring unit that acquires an actual power generation value from a power source to be managed connected to a power system, and acquires an actual charge - discharge amount value from a battery system connected to the power system; A charge - discharge amount determination unit that outputs a charge - discharge command value for the battery system so that a value at the time of supply - demand planning and a value at the time of actual supply - demand match for a second power generation amount that is the result of subtracting a heat capacity constraint relaxation demand, which is a demand for relaxing the heat capacity constraint in the power system, from a first power generation amount that is the power generation amount of the power source to be managed. A supply - demand management device, characterized by the above.

2. The power source to be managed is a renewable energy power source that generates electricity by solar power, wind power, wave power, tidal power, running water, geothermal energy, or biomass. The supply - demand management device according to claim 1, characterized by the above.

3. A plurality of power sources to be managed are provided. The battery system functions as a common demand for relaxing the power generation imbalance of the plurality of power sources to be managed for heat capacity constraint relaxation. The supply - demand management device according to claim 1, characterized by the above.

4. A supply - demand monitoring process that acquires an actual power generation value from a power source to be managed connected to a power system, and acquires an actual charge - discharge amount value from a battery system connected to the power system; A charge - discharge amount determination process that outputs a charge - discharge command value for the battery system so that a value at the time of supply - demand planning and a value at the time of actual supply - demand match for a second power generation amount that is the result of subtracting a heat capacity constraint relaxation demand, which is a demand for relaxing the heat capacity constraint in the power system, from a first power generation amount that is the power generation amount of the power source to be managed. A supply - demand management method, characterized by the above.

5. A computer, A supply - demand monitoring means that acquires an actual power generation value from a power source to be managed connected to a power system, and acquires an actual charge - discharge amount value from a battery system connected to the power system. For the second power generation amount, which is the result of subtracting the heat capacity constraint relaxation demand, which is the demand for relaxing the heat capacity constraint in the power grid, from the first power generation amount, which is the power generation amount of the power supply to be managed, a charge / discharge amount determination means that outputs a charge / discharge command value for the battery system so that the value at the time of supply / demand planning matches the value at the actual supply / demand time. A program for causing it to function as such.

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