Control method, control system, and computer-readable recording medium

Abstract

The invention relates to a control method, a control system, and a computer-readable recording medium, which suppress imbalance and reduce storage capacity. The control method includes the steps of: generating an initial planned value of an amount of power supplied to the power grid for each of a plurality of time periods; a control unit that controls the supply of power to the power grid using the power generated by the power generation device and the charging / discharging power of the power storage system such that the actual performance value of the power supplied to the power grid approaches the planned value in a period after the planned value has been determined; and a step for changing and controlling the planned value for the time period before the planned value is determined so that the accumulated charge / discharge power amount of the power storage system approaches zero, including a step for controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value, and a step for controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value.

Description

Technical Field

[0001] The present invention relates to a control method, a control system and a computer-readable recording medium. Background Art

[0002] For example, according to Patent Document 1, when a power retailer supplies power to a power grid, a planned value of the amount of power supplied is submitted in advance to a power transmission and distribution operator. If an imbalance occurs in the actual performance value of the amount of power supplied to the power grid that deviates from the planned value, payment for the calculation may be sought.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-28146

[0004] In order to suppress the imbalance, it is conceivable to supply electric power as planned by utilizing the charging and discharging of the power storage system. However, if a power storage system with a large power storage capacity is used, the cost will increase. Summary of the invention

[0005] One aspect of the present invention can reduce the storage capacity while suppressing the imbalance.

[0006] A control method according to one aspect of the present invention comprises the following steps: a step of generating initial planned values ​​of the amount of electricity supplied to a power grid for each of a plurality of time periods; a step of controlling the supply of electricity to the power grid using the generated electricity of a power generation device and the charged and discharged electricity of a power storage system in a manner that makes the actual performance value of the amount of electricity supplied to the power grid approach the planned value in the time period after the planned value is determined; and a step of changing the planned value for the time period before the planned value is determined in a manner that makes the accumulated charged and discharged electricity of the power storage system approach zero, wherein the control step comprises the step of controlling the supply of electricity to the power grid in a manner that makes the actual performance value of the amount of electricity supplied approach the changed planned value.

[0007] An aspect of the present invention relates to a control system comprising: a generating unit, which generates initial planned values ​​of the amount of electricity supplied to a power grid for each of a plurality of time periods; a control unit, which controls the supply of electricity to the power grid using the generated electricity of a power generating device and the charged and discharged electricity of a power storage system in a manner that makes the actual performance value of the amount of electricity supplied to the power grid approach the planned value in the time period after the planned value is determined; and a changing unit, which changes the planned value for the time period before the planned value is determined in a manner that makes the accumulated charged and discharged electricity of the power storage system approach zero, wherein the control of the control unit includes controlling the supply of electricity to the power grid in a manner that makes the actual performance value of the amount of electricity supplied approach the changed planned value.

[0008] One aspect of the present invention relates to a computer-readable recording medium having a control program recorded thereon, the control program causing a computer to execute the following processing: a process of generating initial planned values ​​for the amount of electricity supplied to a power grid for each of a plurality of time periods; a process of controlling the supply of electricity to the power grid using the generated electricity of a power generation device and the charged and discharged electricity of a power storage system in a manner that makes the actual performance value of the amount of electricity supplied to the power grid approach the planned value in a time period after the planned value is determined; and a process of changing the planned value for the time period before the planned value is determined in a manner that makes the accumulated charged and discharged electricity of the power storage system approach zero, the control processing including the following processing, namely, controlling the supply of electricity to the power grid in a manner that makes the actual performance value of the amount of electricity supplied approach the changed planned value.

[0009] Effects of the Invention

[0010] According to the present invention, it is possible to reduce the storage capacity while suppressing the imbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a diagram showing an example of a schematic configuration of a control system 1 according to the embodiment.

[0012] Figure 2 It is a diagram showing an example of the power conversion device 4 .

[0013] Figure 3 It is a diagram showing an example of initial planned values.

[0014] Figure 4 It is a figure which shows the example of a prediction result.

[0015] Figure 5 This is a diagram showing an example of absorbing the fluctuation of the generated power amount P2 by the power storage system 3 .

[0016] Figure 6 This is a diagram showing an example of absorbing the fluctuation of the generated power amount P2 by the power storage system 3 .

[0017] Figure 7 1 is a diagram showing an example of the relationship between the cumulative charge and discharge electric quantity Pa of the electric storage system 3 and the required electric storage capacity.

[0018] Figure 8 1 is a diagram showing an example of changes in planned values ​​in time period T and power control.

[0019] Fig. 9 1 is a diagram showing an example of changes in planned values ​​in time period T and power control.

[0020] Fig.10 1 is a diagram showing an example of changes in planned values ​​in time period T and power control.

[0021] Fig.11 It is a diagram showing an example of processing (control method) executed in the control system 1 .

[0022] Fig.12 It is a diagram showing an example of the hardware configuration of the device. DETAILED DESCRIPTION

[0023] Hereinafter, the embodiments will be described with reference to the drawings. The same reference numerals are given to the same elements, and duplicate descriptions will be omitted as appropriate.

[0024] Figure 1 1 is a diagram showing an example of a schematic configuration of a control system 1 according to an embodiment. The control system 1 is connected to a power generation device 2 and a power grid G, and can communicate with several external devices or external systems. As the external devices and external systems, a prediction server 6 and a command system 7 are shown as examples.

[0025] The power grid G ​​is, for example, a commercial power grid (also referred to as a transmission line, etc.) managed by a power transmission and distribution service provider. Figure 1 Although not shown in the figure, in addition to the control system 1, power generation facilities that supply power to the power grid G ​​and necessary household facilities that consume power from the power grid G ​​are also connected to the power grid G. At least part of the power generation facilities are managed and controlled by the power transmission and distribution service provider. For example, the power transmission and distribution service provider adjusts the power generated by the power generation facilities in order to balance the supply and demand of power in the power grid G.

[0026] The control system 1 supplies power to the power grid G ​​or takes power from the power grid G. In the present embodiment, the control system 1 supplies power to the power grid G. The power supplied by the control system 1 to the power grid G ​​may be AC ​​power. The power amount is referred to as supply power P1 in the figure.

[0027] The control system 1 is connected between the power generation device 2 and the power grid G, and includes a power storage system 3, a power conversion device 4, and a control device 5. The power generation device 2 may be included in the control system 1 as a component of the control system 1.

[0028] The power generation device 2 is connected to the power storage system 3 and the power grid G ​​via the power conversion device 4. The power generation by the power generation device 2 includes power generation using natural energy (also called renewable energy). Examples of natural energy are wind energy, solar energy, etc. In this case, the power generation device 2 can be a wind power generation device, a solar power generation device, etc. The power generated by the power generation device 2 can be DC power or AC power. The power is referred to as the power generation power P2 and is illustrated.

[0029] The power storage system 3 is connected to the power generation device 2 and the power grid G ​​via the power conversion device 4. The power storage system 3 charges at least a portion of the power generated by the power generation device 2, and discharges the stored power. The power storage system 3 can be configured to include a battery, for example. In this case, the charge and discharge power of the battery becomes the charge and discharge power of the power storage system 3. It is not limited to batteries, and the power storage system 3 can also be constructed using all technologies that can store power. For example, a fuel cell can be used, in which case the power is stored as hydrogen. The charge and discharge power of the power storage system 3 can be DC power. This amount of electricity is referred to as the charge and discharge amount P3 and is illustrated. Except for special instructions, the discharge amount in the charge and discharge amount P3 is represented by a positive value, and the charge amount is represented by a negative value.

[0030] Note that information on charging and discharging of the power storage system 3 is grasped (monitored, etc.) by a change unit 53 of the control device 5 described later.

[0031] The power conversion device 4 is connected between the power grid G, the power generation device 2, and the power storage system 3. The power conversion device 4 performs various power conversions. The power conversion of the power conversion device 4 may include stepping up or down the voltage of DC power, converting DC power into AC power, and converting AC power into DC power. The power conversion device 4 is also called PCS (Power Conditioning System, Power Converter), etc. In addition, for easy understanding, it is assumed that there is no loss caused by the power conversion of the power conversion device 4.

[0032] The power conversion device 4 supplies power to the power grid G ​​using the power generated by the power generation device 2 and the charge and discharge power of the power storage system 3. Specifically, the power conversion device 4 converts the power generated by the power generation device 2 into power suitable for supply to the power grid G ​​and supplies it to the power grid G. The power conversion device 4 converts the discharged power of the power storage system 3 into power suitable for supply to the power grid G ​​and supplies it to the power grid G. In addition, the power conversion device 4 converts the power generated by the power generation device 2 into power suitable for charging the power storage system 3 and charges the power storage system 3.

[0033] In one embodiment, the power conversion device 4 may be configured to include a plurality of power conversion devices. Figure 2 Provide explanation.

[0034] Figure 24 is a diagram showing an example of a power conversion device 4. In this example, the power conversion device 4 includes a power conversion device 42 and a power conversion device 43. The power conversion device 42 is connected between the power generation device 2, the power conversion device 43, and the power grid G. The power conversion device 42 supplies the power generated by the power generation device 2 to the power grid G, or supplies it to the power conversion device 43. The power conversion device 43 is connected between the power storage system 3, the power conversion device 42, and the power grid G. The power conversion device 43 charges the power storage system 3 using the power from the power conversion device 42 (the power generated by the power generation device 2), or supplies the discharged power of the power storage system 3 to the power grid G.

[0035] also, Figure 2 The structure of the power conversion device 4 shown is only an example. Any structure that can realize the operation required for the power conversion device 4 can be adopted in the control system 1.

[0036] Back to Figure 1 , the total value of the power generated by the power generation device 2 and the charge and discharge power of the power storage system 3 is the power supplied to the power grid G. If described in terms of power, the total value of the power generated P2 and the charge and discharge power P3 is the supply power P1 (P1 = P2 + P3). In addition, information on the supply power P1 is also grasped (monitored, etc.) by the change unit 53 of the control device 5 described later.

[0037] The control device 5 controls the power conversion device 4 to control the power supply to the power grid G. The control device 5 includes a storage unit 50 , a generation unit 51 , a control unit 52 , and a change unit 53 .

[0038] The storage unit 50 stores information used in the control device 5. As the information stored in the storage unit 50, a control program 500 is exemplified. The control program 500 is a program (software) for causing a computer to function as the control device 5.

[0039] The generating unit 51 generates a planned value of the supplied power P1. The planned value generated by the generating unit 51 is also referred to as an initial planned value. Figure 3 Provide explanation.

[0040] Figure 3 1 is a diagram showing an example of an initial planned value. The initial planned value is a planned value of the supply power P1 on a certain future day that is the subject of the planned value. The day that is the subject of the planned value is also referred to as a planned target day.

[0041] The planned day includes a plurality of time periods T obtained by dividing the day. The time period T has a corresponding period (unit period), also referred to as time, etc. An example of the length of the time period T is 30 minutes. In this case, 0:00 to 24:00 of the planned day is divided into 48 time periods T. The initial planned value includes the planned value of the power supply P1 to the power grid G ​​in each of the plurality of time periods T.

[0042] Back to Figure 1 The generating unit 51 generates the above-mentioned initial planned value based on the prediction result of the power generation of the power generation device 2. Figure 1 In the example shown, the prediction server 6 predicts the power generation of the power generation device 2 on the planned date and sends the prediction result to the control device 5. For example, based on the meteorological information (wind force, sunshine, temperature, etc.) of the installation location of the power generation device 2, the predicted value of the power generation of the power generation device 2 or the power generation amount P2 is calculated. Various algorithms or a learned model can be used for the calculation. See also Figure 4 The prediction results are explained.

[0043] Figure 4 is a diagram showing an example of the prediction result. In this example, the prediction result includes the predicted value of the power generation P2 of the power generation device 2 in each of the multiple time periods T of the planned target day. Each time period T is different from the above Figure 2 Corresponding to each time period T.

[0044] Back to Figure 1 For example, the above prediction results are sent from the prediction server 6 to the control device 5. The generator 51 generates an initial planned value based on the prediction results from the prediction server 6. Specifically, the generator 51 generates a predicted value of the power generation P2 of the power generation device 2 in each time period T as a planned value of the supply power P1 in each time period T. For example, Figure 3 The planned value of the supply power P1 in each time period T is Figure 4 The predicted value of the power generation P2 in the corresponding time period T is the same.

[0045] The generator 51 submits the generated initial plan value to the power transmission and distribution service provider that manages the power grid G. Figure 1 In the example shown, the initial planned value is submitted by sending it to the command system 7. The generator 51 submits the initial planned value until the day before the planned date, more specifically until the deadline. An example of the deadline is 12:00 on the day before the planned date.

[0046] The submitted planned values, i.e., the planned values ​​of each of the multiple time periods T, are determined as the time before the start time of the time period T by a predetermined period (e.g., 1 hour). This determination is also called gate close, etc. In the following description, the time when the planned value is determined is also called gate close time.

[0047] In addition, the planned value of the time zone T can be changed (also referred to as modified) until before the gate closing time. The change of the planned value is executed by the change unit 53, which will be described in detail later.

[0048] The command system 7 is a system used by power transmission and distribution service providers, and is also called a central power supply command system, etc. For example, the command system 7 has various functions that can be used for management and control of the power grid G ​​based on the power transmission and distribution service providers. The command system 7 and the power transmission and distribution service providers can be replaced with each other within the scope of no contradiction.

[0049] The command system 7 promotes the preparation for control of the power grid G ​​in a manner that can maintain the balance between supply and demand of the power of the power grid G, based on the submitted initial plan value or the changed plan value. For example, it is assumed that in the time period T (time period T after the plan is determined) after the gate closing time, the supply power P1 of the planned value is supplied to the power grid G ​​from the control system 1, and the preparation for control of the power grid G ​​is promoted. At the same time, it is assumed that even if the actual performance value of the supply power P1 deviates from the planned value and an imbalance occurs, the preparation for control of the power grid G ​​is promoted in a manner that can maintain the balance between supply and demand of the power of the power grid G.

[0050] Returning to the description of the control device 5, the control unit 52 controls the power supply to the power grid G. Specifically, the control unit 52 controls the power conversion device 4 in a manner such that the actual performance value of the power supply P1 to the power grid G ​​approaches the planned value in the time period T after the planned value is determined. As described above, the power supply is the power supply using the generated power of the power generation device 2 and the charged and discharged power of the power storage system 3.

[0051] For example, the control unit 52 sends an instruction value indicating the amount of power that the power converter 4 outputs to the power grid G ​​to the power converter 4. The instruction value may be a value obtained by converting the planned value of the supply power P1 into power. The power converter 4 supplies power to the power grid G ​​according to the instruction value.

[0052] As described above, the planned value of the supply power P1 is the same as the predicted value of the power generation P2 of the power generation device 2. Therefore, if the actual performance value of the power generation P2 in the time period T is the same as the predicted value of the power generation device 2, the entire power generation P2 is supplied as the supply power P1 to the power grid G. The charge and discharge power P3 of the power storage system 3 is zero.

[0053] However, the power generation amount P2 of the power generation device 2 using natural energy often varies (deviates) from the predicted value. This variation is absorbed by the power storage system 3. Figure 5 and Figure 6 Provide explanation.

[0054] Figure 5 and Figure 6 This is a diagram showing an example of absorbing the fluctuation of the generated power amount P2 by the power storage system 3 . Figure 5 The dashed curve represents the predicted value of the power generation P2. The solid curve represents the actual performance value of the power generation P2. Figure 6 The dashed curve represents the planned value of the supplied power P1, and the solid curve represents the actual performance value of the supplied power P1.

[0055] like Figure 5 As shown in FIG. 1 , there is a time period when the actual performance value of the power generation P2 is different from the predicted value. In the time period when the power generation P2 changes in a way that the actual performance value is greater than the predicted value, the power storage system 3 is charged with the power equivalent to the changed value (shown as area F1). On the contrary, in the time period when the power generation P2 changes in a way that the actual performance value is less than the predicted value, the power equivalent to the changed value (shown as area F2) is released from the power storage system 3. As a result, Figure 6 As shown, the actual performance value of the supplied power P1 is close to the planned value. In addition, making the actual performance value close to the planned value can be interpreted as including the meaning of making the actual performance value consistent with the planned value.

[0056] Back to Figure 1 For example, as described above, the change in the power generation P2 of the power generation device 2 relative to the predicted value is absorbed as the charge and discharge power P3 of the power storage system 3, thereby making the actual performance value of the power supply P1 to the power grid G ​​close to the planned value. However, in this case, there is a problem that the cumulative value of the charge and discharge power P3 of the power storage system 3 may increase. If the change in this cumulative value increases, the required storage capacity of the power storage system 3 also increases. Also refer to Figure 7 In addition, below, the integrated value of the charge and discharge electric quantity P3 of the electric storage system 3 is also referred to as the integrated charge and discharge electric quantity Pa.

[0057] Figure 7 1 is a graph showing an example of the relationship between the cumulative charge and discharge power Pa of the power storage system 3 and the required power storage capacity. The horizontal axis of the graph represents time. The vertical axis of the graph represents the cumulative charge and discharge power Pa. As time advances, the cumulative charge and discharge power Pa changes in accordance with the charge and discharge of the power storage system 3.

[0058] The required storage capacity is the amount of electricity equivalent to the difference between the maximum and minimum values ​​of the cumulative charge and discharge electricity Pa. In particular, if the charge and discharge of the power storage system 3 is biased toward charging or discharging, the change in the cumulative charge and discharge electricity Pa increases. The greater the change in the cumulative charge and discharge electricity Pa, the greater the difference between the maximum and minimum values, and therefore the storage capacity also increases.

[0059] The storage capacity can be reduced by reducing the change in the cumulative charge and discharge electric quantity Pa. Therefore, in the present embodiment, the planned value is changed as described below.

[0060] Back to Figure 1 The changing unit 53 changes the planned value of the time period T before the planned value is determined so that the accumulated charge and discharge power Pa of the power storage system 3 approaches zero. Figure 8 to Figure 10 Provide explanation.

[0061] Figure 8 to Figure 10 1 is a diagram showing an example of changes in the planned value and power control in the time period T. In addition, for easy understanding, two different time periods T on the same planned day are also referred to as time period T1 and time period T2. Time period T2 is the time period after time period T1. In addition, the accumulated charge and discharge power Pa of the power storage system 3 at the start of time period T1 is set to zero.

[0062] exist Figure 8 2 shows the power control in the time period T1 after the planned value is determined. As described above, the initial planned value is the same as the predicted value of the power generation amount P2 of the power generation device 2 in the time period T1.

[0063] In reality, the power generation P2 of the power generation device 2 varies with respect to the predicted value. The total value of the predicted value and the fluctuating value of the power generation P2 is the actual performance value of the power generation P2.

[0064] The fluctuation value of the generated power P2 is absorbed as the charge / discharge power P3 of the power storage system 3. As a result, the actual performance value of the supplied power P1 becomes the initial planned value.

[0065] The accumulated charge and discharge power Pa of the power storage system 3 changes in accordance with the charge and discharge power P3 of the power storage system 3 in the above-mentioned time period T1. In this example, as described above, the accumulated charge and discharge power Pa at the beginning of the time period T1 is zero, so the accumulated charge and discharge power Pa at the end of the time period T1 is the charge and discharge power P3 (Pa=P3).

[0066] The changing unit 53 changes the planned value in the time period T2 before the planned value is determined so that the integrated charge and discharge electric quantity Pa of the electric storage system 3 approaches zero.

[0067] exist Fig. 9, shows the change of the planned value of the time period T2 before the planned value is determined. The initial planned value is the predicted value of the power generation P2 of the power generation device 2 in the time period T2. The planned value of the time period T2 is changed relative to the initial planned value. The change is made in a manner to eliminate the change in the cumulative charge and discharge power Pa generated in the previous time period T1. Specifically, the change unit 53 adds a value opposite to the cumulative charge and discharge power Pa at the end of the previous time period T1 to the planned value of the time period T2, that is, a value with a sign opposite to that of the cumulative charge and discharge power Pa (accumulation).

[0068] The change unit 53 submits the changed plan value (sends it to the command system 7). The change unit 53 submits the changed plan value for the time period T2 in the middle of the planned day, more specifically, until the gate closing time of the time period T2. Then, when the gate closing time is reached, the plan value for the time period T2 is determined.

[0069] exist Fig.10 2 shows the power control in time zone T2 after the plan value is determined. As described above, the changed plan value is the value obtained by adding the inverse value of the charge / discharge power P3 in time zone T1 to the initial plan value (= the predicted value of the generated power P2).

[0070] In the time period T2 after the planned value is determined, the control unit 52 controls the power conversion device 4 so that the actual performance value of the power supply P1 to the power grid G ​​approaches the changed planned value.

[0071] Assuming that the actual performance value of the power generation P2 of the power generation device 2 in the time period T2 is the same as the planned value, the power storage system 3 is charged and discharged in the time period T2 with the power of the opposite value to the charge and discharge power P3 of the previous time period T1. The charge and discharge power P3 of the power storage system 3 in the time period T2 is the opposite value to the cumulative charge and discharge power Pa at the end of the time period T1. As a result, the cumulative charge and discharge power Pa at the end of the time period T2 when only the previous time period T1 and the time period T2 are observed (only when the calculation is performed in the above time period) is zero. By adding the opposite value to the cumulative charge and discharge power Pa at the end of the previous time period T1 to the planned value of the subsequent time period T2, the cumulative charge and discharge power Pa of the power storage system 3 can be made close to zero.

[0072] However, if Fig.10 As shown, in time period T2, the power generation P2 of the power generation device 2 may also vary from the predicted value. This variation is absorbed as the charge and discharge power P3 of the power storage system 3. The actual performance value of the supply power P1 is the initial planned value.

[0073] The accumulated charge and discharge power Pa of the power storage system 3 changes in accordance with the charge and discharge power P3 of the power storage system 3. The accumulated charge and discharge power Pa at the end of the previous time period T1 and the power generation power P2 in the time period T2 is observed only, and is a value obtained by subtracting the opposite value of the accumulated charge and discharge power Pa at the end of the time period T1 from the charge and discharge power P3 in the time period T2.

[0074] Furthermore, the value opposite to the accumulated charge and discharge power Pa at the end of the above-mentioned time period T2 is added to the initial planned value of the time period T before the subsequent planned value is determined. In this way, the planned value of the subsequent time period T is changed by adding the value opposite to the accumulated charge and discharge power Pa at the end of a certain time period T, thereby making the actual performance value of the supplied power P1 close to the planned value, and making the accumulated charge and discharge power Pa of the power storage system 3 close to zero. That is, the imbalance can be suppressed and the storage capacity can be reduced. For example, compared with the case where power is continuously supplied for many days without changing the planned value as described above, the storage capacity can be reduced to about one-fifth (about 80%).

[0075] In one embodiment, the time period T2 may be a time period in which the planned value is not determined at the end of the time period T1, and may be the shortest time period relative to the end of the time period T1. Thus, the change in the cumulative charge and discharge power Pa generated in the time period T1 can be eliminated in the shortest time. The effect of reducing the change in the cumulative charge and discharge power Pa and reducing the storage capacity can be further improved.

[0076] Fig.11 1 is a diagram showing an example of processing (control method) executed in the control system 1. Several processing executed on the day before the planned target day and on the planned target day are shown with reference numbers. The processing of step S11 is executed by the generation unit 51 on the day before. The processing of steps S21 to S27 is executed by the control unit 52 on the planned target day. The processing of steps S31 to S37 is executed by the change unit 53 on the planned target day. The description of the contents repeated so far is appropriately omitted.

[0077] In step S11, the initial planned value is generated. The generating unit 51 generates the initial planned value of the power supply P1 to the power grid G ​​for each of the plurality of time periods T of the planned date. The generating unit 51 submits the generated initial planned value (sends it to the command system 7). In this example, the initial planned value is generated and submitted until 12:00 on the day before the planned date.

[0078] In step S21, the power supply is controlled based on the initial planned value. The planned value for the time period T (0:00-0:30) is determined based on the initial planned value. The control unit 52 of the control device 5 controls the power conversion device 4 so that the actual performance value of the power supply P1 to the power grid G ​​is close to the initial planned value. The change value of the power generation P2 of the power generation device 2 is absorbed as the charge and discharge power P3 of the power storage system 3. In response, the accumulated charge and discharge power Pa of the power storage system 3 changes.

[0079] In step S31, the planned value is changed. The change unit 53 of the control device 5 adds a value opposite to the accumulated charge and discharge power Pa at the end of the time period T (0:30) in the previous step S21 to the initial planned value of the time period T before the planned value is determined (2:00-2:30 in this example) to change the planned value. The changed planned value is sent (submitted) to the command system 7. The planned value is changed and submitted until the closing time of the time period T to be changed (1:00 in this example).

[0080] In steps S22 to S24 and steps S32 to S34, the same processing as that in the above-mentioned step S21 and step S31 is performed.

[0081] In step S22, the power supply is controlled based on the initial planned value in the time period T (0:30-1:00). In step S32, the planned value is changed by adding the opposite value of the accumulated charge and discharge power Pa at the end of the time period T in step S22 (1:00) to the initial planned value of the time period T before the planned value is determined (2:30-3:00 in this example).

[0082] In step S23, the power supply is controlled based on the initial planned value in the time period T (1:00-1:30). In step S33, the planned value is changed by adding the opposite value of the accumulated charge and discharge power Pa at the end of the time period T in step S23 (1:30) to the initial planned value of the time period T before the planned value is determined (3:00-3:30 in this example).

[0083] In step S24, the power supply is controlled based on the initial planned value in the time period T (1:30-2:00). In step S34, the planned value is changed by adding the opposite value of the accumulated charge and discharge power Pa at the end of the time period T in step S24 (2:00) to the initial planned value of the time period T before the planned value is determined (3:30-4:00 in this example).

[0084] In step S25, the power supply is controlled based on the changed planned value. The control unit 52 controls the power conversion device 4 so that the actual performance value of the power supply P1 to the power grid G ​​approaches the changed planned value. In addition, the change in the power generation P2 of the power generation device 2 is absorbed by the (further) charge and discharge power P3 of the power storage system 3.

[0085] Here, the time period T (0:00 to 0:30) of the previous step S21 is set as the time period T1, and the time period T (2:00 to 2:30) in this step S25 is set as the time period T2. Fig. 9 As described above, when only the time periods T1 and T2 are observed, the accumulated charge and discharge power Pa at the end of the time period T2 is a value obtained by subtracting the opposite value of the accumulated charge and discharge power Pa at the end of the time period T1 from the charge and discharge power P3 of the time period T2. Therefore, the accumulated charge and discharge power Pa of the power storage system 3 is close to zero.

[0086] In step S35, the planned value is changed. The change unit 53 of the control device 5 adds the opposite value of the accumulated charge and discharge power Pa at the end of the time period T (2:30) in the previous step S25 to the initial planned value before the planned value is determined (for example, 4:00-4:30), and changes the planned value. The changed planned value is sent (submitted) to the instruction system 7.

[0087] In steps S26 to S27 and steps S36 to S37, the same processing as that in the above-mentioned steps S25 and S35 is performed.

[0088] In step S26, power control based on the changed planned value is performed in the time period T (2:30-3:00). In step S36, the planned value is changed by adding the opposite value of the accumulated charge and discharge power Pa at the end of the time period T (3:00) in step S26 to the initial planned value of the time period T before the planned value is determined (for example, 4:30-5:00).

[0089] In step S27, power control is performed based on the changed planned value in the time period T (3:00-3:30). In step S37, the planned value is changed by adding a value opposite to the accumulated charge and discharge power Pa at the end of the time period T (3:30) in step S27 to the initial planned value of the time period T before the planned value is determined (e.g., 5:00-5:30).

[0090] By repeatedly executing the above-described processing, the actual performance value of the supplied power P1 can be brought close to the planned value, and the accumulated charge and discharge power Pa of the power storage system 3 can be brought close to zero. That is, the imbalance can be suppressed and the power storage capacity can be reduced.

[0091] Fig.12 1 is a diagram showing an example of the hardware structure of the device. A computer or the like having the hardware structure shown as an example functions as the control device 5 described so far. The control device 5 includes a communication device 5a, a display device 5b, a HDD (Hard Disk Drive) 5c, a memory 5d, and a processor 5e connected to each other via a bus or the like.

[0092] The communication device 5a is a network interface card or the like, and can communicate with other devices. The display device 5b is, for example, a touch panel, a display, etc. The HDD 5c functions as the storage unit 50 , and stores, for example, a control program 500 .

[0093] The processor 5e reads the control program 500 from the HDD 5c or the like and expands it in the memory 5d, thereby causing the computer to function as the control device 5. The functions of the control device 5 include the functions of the generating unit 51, the controlling unit 52, and the changing unit 53 described above.

[0094] The control program 500 can be distributed via a network such as the Internet, etc. In addition, the control program 500 can be recorded on a computer-readable recording medium such as a hard disk, a floppy disk (FD), a CD-ROM, an MO (Magneto-Optical disk), or a DVD (Digital Versatile Disc), and read out from the recording medium by a computer for execution.

[0095] The disclosed technology is not limited to the above-mentioned embodiments. For example, in the above-mentioned embodiments, the case where the prediction of power generation of the power generation device 2 is predicted in the prediction server 6 is described as an example. However, the function of the prediction server 6 can be embedded in the control device 5. The power generation device 2 is not limited to a wind power generation device and a solar power generation device. All devices that generate electricity using natural energy can be used as the power generation device 2.

[0096] The above-described technology is determined, for example, in the following manner. One of the disclosed technologies is a control method. Figure 1 to Figure 4 as well as Figure 8 to Figure 11As described in the above, the control method includes the following steps: generating initial planned values ​​of the power supply P1 to the power grid G ​​for each of the plurality of time periods T (step S11); in the time period T after the planned value is determined, controlling the power supply to the power grid G ​​using the generated power of the power generation device 2 and the charged and discharged power of the power storage system 3 in such a manner that the actual performance value of the power supply P1 to the power grid G ​​approaches the planned value (steps S21 to S27); and changing the planned value of the time period T before the planned value is determined in such a manner that the accumulated charged and discharged power Pa of the power storage system 3 approaches zero (steps S31 to S37), and the control steps (steps S21 to S27) include the following steps, namely, controlling the power supply to the power grid G ​​in such a manner that the actual performance value of the power supply P1 approaches the changed planned value (steps S25 to S27).

[0097] According to the above control method, not only the actual performance value of the power supply P1 to the power grid G ​​is brought close to the planned value, but also the cumulative charge and discharge power Pa of the power storage system 3 is brought close to zero. The change of the cumulative charge and discharge power Pa is suppressed, and accordingly, the required storage capacity of the power storage system 3 is also reduced. Therefore, it is possible to suppress the imbalance and reduce the storage capacity.

[0098] As reference Figure 8 to Figure 11 As described in the above, the step of changing the planned value (steps S31 to S37) may include the step of adding a value opposite to the charge and discharge power P3 of the power storage system 3 at the end of the time period T after the planned value is determined (for example, time period T1) to the planned value of the time period T before the planned value is determined (for example, time period T2). For example, by eliminating the change of the accumulated charge and discharge power Pa generated in the previous time period T in the subsequent time period T in this way, the accumulated charge and discharge power Pa of the power storage system 3 can be made close to zero.

[0099] As reference Figure 8 to Figure 11 As described in the above, the step of changing the planned value (steps S31 to S37) may include the step of changing the planned value of the time period T before the shortest planned value is determined relative to the end of the time period T after the planned value is determined. In this way, the change of the cumulative charge and discharge power Pa generated in the previous time period T can be eliminated in the shortest time. The effect of reducing the change of the cumulative charge and discharge power Pa and reducing the storage capacity can be further improved.

[0100] As reference Figure 1 , Figure 3 as well as Fig.11As described in the above, the plurality of time periods T are the plurality of time periods T obtained by dividing the planned target day, the step of generating the initial planned value (step S11) may include the following steps, that is, submitting the initial planned value to the power transmission and distribution service provider who manages the power grid G ​​until the day before the planned target day (for example, sending it to the command system 7), and the step of changing the planned value (steps S31 to S37) may include the following steps, that is, submitting the changed planned value to the power transmission and distribution service provider on the planned target day (for example, sending it to the command system 7). Thus, when supplying power to the power grid G ​​managed by the power transmission and distribution service provider, it is possible to suppress imbalance and reduce the storage capacity.

[0101] As reference Figure 1 to Figure 5 as well as Figure 8 to Figure 11 As described in the above, the step of generating the initial plan value (step S11) based on the fact that the power generation of the power generation device 2 includes power generation using natural energy may include the following steps, that is, generating a predicted value of the power generation amount P2 of the power generation device 2 as the initial plan value, and the control steps (steps S21 to S27) may include the following steps, that is, absorbing the change value of the power generation amount P2 of the power generation device 2 relative to the predicted value using the charge and discharge power amount P3 of the power storage system 3. For example, the power supply to the power grid G ​​using the power generated by the power generation device 2 and the charge and discharge power of the power storage system 3 can be controlled thereby.

[0102] Reference Figure 1 to Figure 4 as well as Figure 8 to Figure 11 The control system 1 described in the above-mentioned examples is also one of the disclosed technologies. The control system 1 includes: a generating unit 51 that generates initial planned values ​​of the power supply P1 to the power grid G ​​for each of a plurality of time periods T; a control unit 52 that controls the power supply to the power grid G ​​using the generated power of the power generation device 2 and the charged and discharged power of the power storage system 3 in the time period T after the planned value is determined so that the actual performance value of the power supply P1 to the power grid G ​​approaches the planned value; and a changing unit 53 that changes the planned value of the time period T before the planned value is determined so that the accumulated charged and discharged power Pa of the power storage system 3 approaches zero, and the control of the control unit 52 includes controlling the power supply to the power grid G ​​so that the actual performance value of the power supply P1 approaches the changed planned value. According to this control system 1, it is also possible to suppress the imbalance and reduce the storage capacity as described so far.

[0103] Reference Figure 1 to Figure 4 as well as Figure 8 to Figure 12The control program 500 described in the above is also one of the disclosed technologies. The control program 500 causes the computer to execute the following processing: a process of generating an initial planned value of the power supply P1 to the power grid G ​​for each of the plurality of time periods T; a process of controlling the power supply to the power grid G ​​using the power generated by the power generation device 2 and the charge and discharge power of the power storage system 3 in the time period T after the planned value is determined so that the actual performance value of the power supply P1 to the power grid G ​​approaches the planned value; and a process of changing the planned value of the time period T before the planned value is determined so that the accumulated charge and discharge power Pa of the power storage system 3 approaches zero, wherein the control process includes the following process, that is, controlling the power supply to the power grid G ​​so that the actual performance value of the power supply P1 approaches the changed planned value. According to such a control program 500, it is also possible to suppress the imbalance and reduce the storage capacity as described so far.

[0104] Several examples of combinations of disclosed technical features are described below.

[0105] (1) A control method, wherein:

[0106] The control method comprises the following steps:

[0107] The step of generating initial planned values ​​of the amount of electricity supplied to the power grid for each of a plurality of time periods;

[0108] The step of controlling the supply of electric power to the power grid using the electric power generated by the power generation device and the electric power charged and discharged by the power storage system in a time period after the planned value is determined so that the actual performance value of the electric power supplied to the power grid approaches the planned value; and

[0109] The step of changing the planned value for the time period before the planned value is determined so that the accumulated charge and discharge amount of the power storage system approaches zero,

[0110] The step of controlling includes the step of controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value.

[0111] (2) A control method according to (1), wherein:

[0112] The step of changing the planned value includes the step of adding, to the planned value for the time period before the planned value is determined, a value opposite to the charge and discharge amount of the power storage system at the end of the time period after the planned value is determined.

[0113] (3) The control method according to (1) or (2), wherein:

[0114] The step of changing the planned value includes the step of changing the planned value of the time period before the shortest planned value is determined relative to the end of the time period after the planned value is determined.

[0115] (4) The control method according to any one of (1) to (3), wherein:

[0116] The multiple time periods are multiple time periods obtained by dividing the planned target day.

[0117] The step of generating the initial planned value includes the steps of submitting the initial planned value to a power transmission and distribution service provider that manages the power network by one day before the planned target day,

[0118] The step of changing the planned value includes the step of submitting the changed planned value to the power transmission and distribution business operator on the planned date.

[0119] (5) The control method according to any one of (1) to (4), wherein:

[0120] The power generation by the power generation device includes power generation using natural energy.

[0121] The step of generating the initial planned value includes the steps of generating a predicted value of the amount of power generated by the power generation device as the initial planned value,

[0122] The step of controlling includes the step of absorbing a variation value of the power generation amount of the power generation device with respect to the predicted value by using the charge and discharge amount of the power storage system.

[0123] (6) A control system, wherein:

[0124] The control system has:

[0125] a generating unit for generating initial planned values ​​of the amount of electricity supplied to the power grid for each of a plurality of time periods;

[0126] a control unit that controls the supply of electric power to the power grid using the electric power generated by the power generation device and the electric power charged and discharged by the power storage system so that an actual performance value of the electric power supplied to the power grid approaches the planned value in a time period after the planned value is determined; and

[0127] a changing unit configured to change the planned value for a time period before the planned value is determined so that the accumulated charge and discharge amount of the power storage system approaches zero,

[0128] The control by the control unit includes controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value.

[0129] (7) A control program, wherein:

[0130] The control program causes the computer to execute the following processing:

[0131] A process of generating initial planned values ​​of power supply to the power grid for each of a plurality of time periods;

[0132] Processing for controlling the supply of electric power to the power grid using the electric power generated by the power generation device and the electric power charged and discharged by the power storage system in a manner that the actual performance value of the electric power supplied to the power grid approaches the planned value in a time period after the planned value is determined; and

[0133] The planned value for the time period before the planned value is determined is changed so that the accumulated charge and discharge amount of the power storage system approaches zero.

[0134] The control process includes a process of controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value.

[0135] Description of the label

[0136] 1 Control system

[0137] 2 Power generation device

[0138] 3 Power storage system

[0139] 4 Power conversion device

[0140] 5 Control device

[0141] 51 Generation Department

[0142] 52 Control Department

[0143] 53 Change Department

[0144] 50 Storage

[0145] 500 control program

[0146] 6 Prediction Server

[0147] 7 Command system

[0148] G Power grid

[0149] P1 Power supply

[0150] P2 Power generation

[0151] P3 charge and discharge capacity

[0152] Pa Accumulated charge and discharge capacity

[0153] T time period

[0154] T1 time period

[0155] T2 time period

Claims

1. A control method, wherein: The control method comprises the following steps: The step of generating initial planned values ​​of the amount of electricity supplied to the power grid for each of a plurality of time periods; A step of controlling the supply of electric power to the power grid using the electric power generated by the power generation device and the electric power charged and discharged by the power storage system in a time period after the planned value is determined, so that the actual performance value of the electric power supplied to the power grid approaches the planned value; as well as The step of changing the planned value for the time period before the planned value is determined so that the accumulated charge and discharge amount of the power storage system approaches zero, The step of controlling includes the step of controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value.

2. The control method according to claim 1, wherein: The step of changing the planned value includes the step of adding, to the planned value for the time period before the planned value is determined, a value opposite to the charge and discharge amount of the power storage system at the end of the time period after the planned value is determined.

3. The control method according to claim 1 or 2, wherein: The step of changing the planned value includes the step of changing the planned value of the time period before the shortest planned value is determined relative to the end of the time period after the planned value is determined.

4. The control method according to claim 1 or 2, wherein: The multiple time periods are multiple time periods obtained by dividing the planned target day. The step of generating the initial planned value includes the steps of submitting the initial planned value to a power transmission and distribution service provider that manages the power network by one day before the planned target day, The step of changing the planned value includes the step of submitting the changed planned value to the power transmission and distribution business operator on the planned date.

5. The control method according to claim 1 or 2, wherein: The power generation by the power generation device includes power generation using natural energy. The step of generating the initial planned value includes the steps of generating a predicted value of the amount of power generated by the power generation device as the initial planned value, The step of controlling includes the step of absorbing a variation value of the power generation amount of the power generation device with respect to the predicted value by using the charge and discharge amount of the power storage system.

6. A control system, wherein: The control system has: a generating unit for generating initial planned values ​​of the amount of electricity supplied to the power grid for each of a plurality of time periods; a control unit that controls the supply of electric power to the power grid using the electric power generated by the power generation device and the electric power charged and discharged by the power storage system so that an actual performance value of the electric power supplied to the power grid approaches the planned value during a time period after the planned value is determined; as well as a changing unit configured to change the planned value for a time period before the planned value is determined so that the accumulated charge and discharge amount of the power storage system approaches zero, The control by the control unit includes controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value.

7. A computer-readable recording medium having a control program recorded thereon, wherein: The control program causes the computer to execute the following processing: A process of generating initial planned values ​​of power supply to the power grid for each of a plurality of time periods; Processing for controlling the supply of electric power to the power grid using the electric power generated by the power generation device and the electric power charged and discharged by the power storage system in a time period after the planned value is determined, so that the actual performance value of the electric power supplied to the power grid approaches the planned value; as well as The planned value for the time period before the planned value is determined is changed so that the accumulated charge and discharge amount of the power storage system approaches zero. The control process includes a process of controlling the power supply to the power grid so that the actual performance value of the supplied power amount approaches the changed planned value.

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