Control method, control system, and control program

Abstract

To reduce a power storage capacity while suppressing an imbalance.SOLUTION: A control method contains steps of: generating an initial plan value of a supply power amount to a power network in each of a plurality of time bands; controlling a power supply to the power network using a power generation in a power generation device and a charging and discharging power of a power storage system so that an actual value of a supply power amount to the power network is closed to a planed value in the time band after a confirmation of the planed value; and changing the planed value in the time band before the confirmation of the planed value so that an integration charging and discharging power amount of the power storage system is closed to zero. The step of controlling contains a control of a power supply to the power network so that the actual value of the supply power amount is closed to the planed value after the change.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a control method, a control system, and a control program. [Background technology]

[0002] For example, as known from Patent Document 1, when an electricity retailer or the like supplies electricity to a power grid, the retailer submits a planned value for the amount of electricity to be supplied to the electricity transmission and distribution company in advance. If an imbalance occurs in which the actual value of the amount of electricity supplied to the power grid deviates from the planned value, a payment for settlement may be required. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-28146 A Summary of the Invention [Problem to be solved by the invention]

[0004] One way to suppress the imbalance is to supply power according to a planned value by using the charging and discharging of a power storage system. However, using a power storage system with a large storage capacity increases costs.

[0005] One aspect of the present disclosure is to reduce the storage capacity while suppressing the imbalance. [Means for solving the problem]

[0006] A control method according to one aspect of the present disclosure includes generating an initial planned value for the amount of power supplied to a power grid in each of a plurality of time periods, controlling power supply to the power grid using the generated power of a power generation device and the charged / discharged power of a power storage system so that, in a time period after the planned value is confirmed, an actual value of the amount of power supplied to the power grid approaches the planned value, and changing the planned value for the time period before the planned value is confirmed so that an integrated charged / discharged amount of power of the power storage system approaches zero, where the controlling includes controlling the supply of power to the power grid so that the actual value of the amount of power supplied approaches the changed planned value.

[0007] A control system according to one aspect of the present disclosure includes a generation unit that generates initial planned values ​​for the amount of power supplied to a power grid in each of a plurality of time periods; a control unit that controls power supply to the power grid using generated power from a power generation device and charged / discharged power from a power storage system so that an actual value of the amount of power supplied to the power grid in a time period after the planned values ​​are confirmed approaches the planned value; and a modification unit that changes the planned values ​​for the time period before the planned values ​​are confirmed so as to bring an integrated charged / discharged amount of power of the power storage system closer to zero, and the control by the control unit includes controlling the supply of power to the power grid so as to bring the actual value of the amount of power supplied to the power grid closer to the changed planned value.

[0008] A control program according to one aspect of the present disclosure causes a computer to execute the following processes: generating initial planned values ​​for the amount of power to be supplied to a power grid in each of a plurality of time periods; controlling the supply of power to the power grid using the generated power of a power generation device and the charged / discharged power of a power storage system so that, in a time period after the planned values ​​have been determined, an actual value of the amount of power to be supplied to the power grid approaches the planned value; and changing the planned values ​​for the time period before the planned values ​​were determined so that an integrated charged / discharged amount of power of the power storage system approaches zero. The control processes include controlling the supply of power to the power grid so that the actual value of the amount of power to be supplied approaches the changed planned value. Effect of the Invention

[0009] According to the present invention, it is possible to reduce the storage capacity while suppressing the imbalance. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating an example of a schematic configuration of a control system 1 according to an embodiment. [Diagram 2] FIG. 2 is a diagram illustrating an example of a power conversion device 4. [Diagram 3] FIG. 13 is a diagram illustrating an example of initial planned values. [Figure 4] FIG. 13 is a diagram illustrating an example of a prediction result. [Diagram 5] 11 is a diagram showing an example of absorption of fluctuations in generated power amount P2 by the power storage system 3. FIG. [Figure 6] 11 is a diagram showing an example of absorption of fluctuations in generated power amount P2 by the power storage system 3. FIG. [Figure 7] 10 is a diagram showing an example of the relationship between the integrated charge / discharge power amount Pa of the power storage system 3 and the required power storage capacity. FIG. [Figure 8] 13 is a diagram illustrating an example of change in planned values ​​for a time slot T and power control. FIG. [Figure 9] 13 is a diagram illustrating an example of change in planned values ​​for a time slot T and power control. FIG. [Figure 10] 13 is a diagram illustrating an example of change in planned values ​​for a time slot T and power control. FIG. [Figure 11] 2 is a diagram illustrating an example of a process (control method) executed in the control system 1. FIG. [Figure 12] FIG. 2 illustrates an example of a hardware configuration of the apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment will be described with reference to the drawings. The same elements are given the same reference numerals, and duplicated descriptions will be omitted as appropriate.

[0012] 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 systems. A prediction server 6 and a command system 7 are exemplified as the external devices and systems.

[0013] The power grid G ​​is, for example, a commercial power grid (which can also be called a power transmission line, etc.) managed by a power transmission and distribution business operator. Although not shown in FIG. 1 , in addition to the control system 1, power generation facilities that supply power to the power grid G, consumer facilities that consume power from the power grid G, etc. are connected to the power grid G. At least some of the power generation facilities are managed, controlled, etc. by the power transmission and distribution business operator. For example, the power transmission and distribution business operator adjusts the power generated by the power generation facilities to balance the power supply and demand of the power grid G.

[0014] The control system 1 supplies power to the power grid G ​​and takes in power from the power grid G. In this embodiment, in particular, 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 amount of power is referred to as a supply power amount P1 and is illustrated.

[0015] The control system 1 is connected between a power generation device 2 and a 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.

[0016] The power generation device 2 is connected to the power storage system 3 and the power grid G ​​via a power conversion device 4. 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 and solar energy, and in that case, the power generation device 2 may be a wind power generation device, a solar power generation device, etc. The power generated by the power generation device 2 may be DC power or AC power. The amount of power is referred to as generated power amount P2 and is illustrated.

[0017] The power storage system 3 is connected to the power generation device 2 and the power grid G ​​via a power conversion device 4. The power storage system 3 charges at least a part of the power generated by the power generation device 2 and discharges the stored power. The power storage system 3 may be configured to include, for example, a storage battery. In this case, the charging and discharging power of the storage battery becomes the charging and discharging power of the power storage system 3. The power storage system 3 may be constructed using any technology capable of storing power, not limited to a storage battery. For example, a fuel cell may be used, in which case the power is stored as hydrogen. The charging and discharging power of the power storage system 3 may be DC power. The amount of power is referred to as the charging and discharging power amount P3 and is illustrated. Unless otherwise specified, the discharging power amount of the charging and discharging power amount P3 is represented by a positive value, and the charging power amount is represented by a negative value.

[0018] Information relating to charging and discharging of the power storage system 3 is grasped (monitored, etc.) by a change unit 53 of the control device 5, which will be described later.

[0019] 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 types of power conversion. The power conversion by the power conversion device 4 may include stepping up or stepping down DC power, converting DC power to AC power, and converting AC power to DC power. The power conversion device 4 is also called a PCS (Power Conditioning System, Power Converter), etc. For ease of understanding, it is assumed that there is no loss due to the power conversion by the power conversion device 4.

[0020] The power conversion device 4 supplies power to the power grid G ​​using the power generated by the power generation device 2 and the charging / discharging 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.

[0021] In one embodiment, the power conversion device 4 may be configured to include a plurality of power conversion devices. Description will be made with reference to FIG.

[0022] FIG. 2 is a diagram illustrating an example of the 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 a power grid G. The power conversion device 42 supplies the power generated by the power generation device 2 to the power grid G ​​and 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 with power from the power conversion device 42 (the power generated by the power generation device 2) and supplies the discharged power of the power storage system 3 to the power grid G.

[0023] 2 is merely an example. Any configuration capable of implementing the operation required of the power conversion device 4 in the control system 1 may be adopted.

[0024] 1, the sum of the power generated by the power generation device 2 and the charging / discharging power of the power storage system 3 becomes the power supplied to the power grid G. In terms of the amount of power, the sum of the amount of power generated P2 and the amount of power charged / discharged P3 becomes the amount of power supplied P1 (P1=P2+P3). Note that information regarding the amount of power supplied P1 is also grasped (monitored, etc.) by a change unit 53 of the control device 5 described later.

[0025] 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.

[0026] The storage unit 50 stores information used by the control device 5. An example of the information stored in the storage unit 50 is a control program 500. The control program 500 is a program (software) for causing a computer to function as the control device 5.

[0027] The generating unit 51 generates a planned value of the amount of power supply P1. The planned value generated by the generating unit 51 is also referred to as an initial planned value. The following description will be given with reference to FIG.

[0028] 3 is a diagram showing an example of an initial planned value. The initial planned value is a planned value of the power supply amount P1 on a certain future day that is the subject of the planned value. The subject day of the planned value is also called the planned subject day.

[0029] The planned target date includes a number of time slots T obtained by dividing the day. The time slots T have a given period (unit period) and are also called periods. An example of the length of the time slots T is 30 minutes, and in this case, 0:00 to 24:00 on the planned target date is divided into 48 time slots T. The initial planned value includes a planned value of the amount of power P1 to be supplied to the power grid G ​​in each of the multiple time slots T.

[0030] Returning to FIG. 1, the generation unit 51 generates the above-mentioned initial planned value based on the predicted result of power generation of the power generation device 2. In the example shown in FIG. 1, the prediction server 6 predicts the power generation of the power generation device 2 on the planned target date and transmits the predicted result to the control device 5. For example, a predicted value of the power generation power or generated power amount P2 of the power generation device 2 is calculated based on meteorological information (wind power, solar radiation, temperature, etc.) of the installation location of the power generation device 2. Various algorithms or trained models may be used for the calculation. The predicted result will be described with reference to FIG. 4 as well.

[0031] 4 is a diagram showing an example of a prediction result. In this example, the prediction result includes a predicted value of the amount of power generated P2 of the power generation device 2 in each of a plurality of time slots T on the planned date. Each time slot T corresponds to each time slot T in FIG. 2 described above.

[0032] Returning to FIG. 1, for example, a prediction result as described above is transmitted from the prediction server 6 to the control device 5. The generation unit 51 generates an initial planned value based on the prediction result from the prediction server 6. Specifically, the generation unit 51 generates a predicted value of the power generation amount P2 of the power generation device 2 for each time slot T as a planned value of the supply power amount P1 for each time slot T. For example, the planned value of the supply power amount P1 for each time slot T in FIG. 3 described above becomes the same as the predicted value of the power generation amount P2 for the corresponding time slot T in FIG. 4.

[0033] The generation unit 51 submits the generated initial planned value to the power transmission and distribution business operator that manages the power grid G. In the example shown in Fig. 1, the submission is performed by transmitting the initial planned value to the command system 7. The generation unit 51 submits the initial planned value by the day before the target planning day, more specifically, by the deadline time. An example of the deadline time is 12:00 on the day before the target planning day.

[0034] The submitted planned value, i.e., the planned value for each of the multiple time slots T, is finalized at a time a predetermined period (e.g., one hour) before the start time of the time slot T. This finalization is also called gate close, etc. In the following explanation, the time at which the planned value is finalized is also called gate close time.

[0035] The planned value of the time slot T can be changed (also called modified) until the gate closing time. The change of the planned value is performed by the change unit 53, and the details will be described later.

[0036] The command system 7 is a system used by the power transmission and distribution business operator, and is also called a central load dispatching system. For example, the command system 7 has various functions that can be provided to the power transmission and distribution business operator for management, control, etc. of the power grid G. To the extent that there is no contradiction, the command system 7 and the power transmission and distribution business operator may be read as interchangeable.

[0037] Based on the submitted initial planned value or the changed planned value, the command system 7 prepares to control the power grid G ​​so as to maintain the power supply and demand balance of the power grid G. For example, in a time period T when the planned value is finalized after the gate closing time (time period T after the plan is finalized), the command system 7 prepares to control the power grid G ​​on the assumption that the supply amount of power P1 according to the planned value will be supplied from the control system 1 to the power grid G. At the same time, even if the actual value of the supply amount of power P1 deviates from the planned value and an imbalance occurs, the command system 7 prepares to control the power grid G ​​so as to maintain the power supply and demand balance of the power grid G.

[0038] Returning to the explanation 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 so that the actual value of the amount of power P1 supplied 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 a power supply using the generated power of the power generation device 2 and the charged / discharged power of the power storage system 3.

[0039] For example, the control unit 52 transmits to the power electronics device 4 an instruction value indicating the amount of power that the power electronics device 4 outputs to the power grid G. The instruction value may be a value obtained by converting a planned value of the amount of power supply P1 into power. The power electronics device 4 supplies power to the power grid G ​​in accordance with the instruction value.

[0040] As described above, the planned value of the supply energy P1 is the same as the predicted value of the power generation energy P2 of the power generation device 2. Therefore, if the actual value of the power generation energy P2 in the time period T is the same as the predicted value of the power generation device 2, the entire power generation energy P2 is supplied to the power grid G ​​as the supply energy P1. The charge / discharge energy P3 of the power storage system 3 becomes zero.

[0041] However, it is not rare that the generated power amount P2 of the power generation device 2 that utilizes natural energy varies (deviations) from the predicted value. This variation is absorbed by the power storage system 3. The following description will be given with reference to Figs. 5 and 6 as well.

[0042] Fig. 5 and Fig. 6 are diagrams showing an example of absorption of fluctuations in the amount of generated power P2 by the power storage system 3. The dashed graph line in Fig. 5 shows a predicted value of the amount of generated power P2. The solid graph line shows an actual value of the amount of generated power P2. The dashed graph line in Fig. 6 shows a planned value of the amount of supplied power P1. The solid graph line shows an actual value of the amount of supplied power P1.

[0043] As shown in Fig. 5, there is a time period during which the actual value of the amount of power generation P2 differs from the predicted value. In a time period during which the amount of power generation P2 fluctuates so that the actual value is greater than the predicted value, an amount of power (shown as area F1) equivalent to the fluctuating value is charged to the energy storage system 3. Conversely, in a time period during which the amount of power generation P2 fluctuates so that the actual value is smaller than the predicted value, an amount of power (shown as area F2) equivalent to the fluctuating value is discharged from the energy storage system 3. As a result, as shown in Fig. 6, the actual value of the amount of power supply P1 is brought closer to the planned value. Note that bringing the actual value closer to the planned value may be interpreted as including making the actual value coincide with the planned value.

[0044] Returning to FIG. 1, for example, as described above, by absorbing the fluctuation value from the predicted value of the generated power amount P2 of the power generation device 2 as the charge / discharge power amount P3 of the power storage system 3, the actual value of the supplied power amount P1 to the power grid G ​​can be brought closer to the planned value. In this case, however, there is a problem that the integrated value of the charge / discharge power amount P3 of the power storage system 3 may become large. When the change in this integrated value becomes large, the required storage capacity of the power storage system 3 also becomes large. An explanation will be given with reference to FIG. 7. In the following, the integrated value of the charge / discharge power amount P3 of the power storage system 3 is also referred to as the integrated charge / discharge power amount Pa.

[0045] 7 is a diagram showing an example of the relationship between the accumulated charge / discharge power amount Pa of the power storage system 3 and the required power storage capacity. The horizontal axis of the graph indicates time. The vertical axis of the graph indicates the accumulated charge / discharge power amount Pa. As time progresses, the accumulated charge / discharge power amount Pa changes in accordance with the charging and discharging of the power storage system 3.

[0046] The amount of power equivalent to the difference between the maximum and minimum values ​​of the integrated charge / discharge power amount Pa is the required storage capacity. In particular, if the charging / discharging of the storage system 3 is biased toward charging or discharging, the change in the integrated charge / discharge power amount Pa becomes large. The larger the change in the integrated charge / discharge power amount Pa, the larger the difference between the maximum and minimum values ​​becomes, and therefore the storage capacity also becomes large.

[0047] The power storage capacity can be reduced by reducing the change in the integrated charge / discharge power amount Pa. To achieve this, in this embodiment, the planned value is changed as described below.

[0048] Returning to Fig. 1, the change unit 53 changes the planned value of the time slot T before the planned value is determined so as to bring the integrated charge / discharge power amount Pa of the power storage system 3 closer to zero. The following description will be given with reference to Figs. 8 to 10 as well.

[0049] 8 to 10 are diagrams showing examples of changes to the planned values ​​of time slot T and power control. For ease of understanding, two different time slots T on the same planned date are also referred to as time slot T1 and time slot T2. Time slot T2 is a time slot after time slot T1. It is assumed that the integrated charge / discharge power amount Pa of the power storage system 3 at the start of time slot T1 is zero.

[0050] 8 shows power control for time slot T1 after the planned value has been confirmed. As described above, the initial planned value is the same as the predicted value of the amount of power generated P2 of the power generation device 2 for time slot T1.

[0051] In reality, the generated power amount P2 of the power generating device 2 fluctuates from the predicted value. The sum of the predicted value and the fluctuating value of the generated power amount P2 is the actual value of the generated power amount P2.

[0052] The fluctuation value of the generated power amount P2 is absorbed as the charged / discharged power amount P3 of the power storage system 3. As a result, the actual value of the supplied power amount P1 becomes the initially planned value.

[0053] The integrated charge / discharge power amount Pa of the power storage system 3 changes by the charge / discharge power amount P3 of the power storage system 3 during the time period T1. In this example, since the integrated charge / discharge power amount Pa at the start of the time period T1 is zero as described above, the integrated charge / discharge power amount Pa at the end of the time period T1 becomes the charge / discharge power amount P3 (Pa=P3).

[0054] The change unit 53 changes the planned value for the time slot T2 before the planned value is determined so as to bring the integrated charge / discharge power amount Pa of the power storage system 3 closer to zero.

[0055] FIG. 9 shows a change to the planned value for time slot T2 before the planned value is confirmed. The original planned value is a predicted value of the amount of power generated P2 by the power generation device 2 for time slot T2. The planned value for time slot T2 is changed from the original planned value. This change is made so as to cancel out the change in the accumulated charge / discharge power amount Pa that occurred in the previous time slot T1. Specifically, the change unit 53 adds (adds) the opposite value of the accumulated charge / discharge power amount Pa at the end of the previous time slot T1, that is, a value with the sign of the accumulated charge / discharge power amount Pa reversed, to the planned value for time slot T2.

[0056] The change unit 53 submits the changed planned value (transmits it to the command system 7). The change unit 53 submits the changed planned value for time slot T2 during the planning target day, more specifically, by the gate closing time of time slot T2. After that, the gate closing time arrives and the planned value for time slot T2 is finalized.

[0057] 10 shows the power control in the time slot T2 after the planned value is confirmed. As described above, the changed planned value is the original planned value (= the predicted value of the amount of power generation P2) plus the opposite value of the amount of charge / discharge power P3 in the time slot T1.

[0058] In time slot T2 after the planned value is determined, controller 52 controls power converter 4 so that the actual value of amount of power P1 supplied to power grid G ​​approaches the changed planned value.

[0059] If the actual value of the amount of power generated P2 by the power generation device 2 during time slot T2 is the same as the planned value, then during this time slot T2, the energy storage system 3 charges and discharges an amount of power that is the opposite value to the amount of charge and discharge power P3 during the previous time slot T1. The amount of charge and discharge power P3 of the energy storage system 3 during time slot T2 will be the opposite value to the accumulated amount of charge and discharge power Pa at the end of time slot T1. As a result, the accumulated amount of charge and discharge power Pa at the end of time slot T2 when only the previous time slot T1 and this time slot T2 are considered (when calculated only for these time slots) will be zero. In this way, by adding the opposite value to the accumulated amount of charge and discharge power Pa at the end of the previous time slot T1 to the planned value for the later time slot T2, the accumulated amount of charge and discharge power Pa of the energy storage system 3 can be brought closer to zero.

[0060] 10, the amount of power generated P2 of the power generation device 2 may vary from the predicted value even during the time slot T2. This variation is absorbed as the amount of charge / discharge power P3 of the power storage system 3. The actual value of the amount of supplied power P1 becomes the initial planned value.

[0061] The accumulated charge / discharge energy Pa of the power storage system 3 changes by the amount of charge / discharge energy P3 of the power storage system 3. The accumulated charge / discharge energy Pa at the end of the generated energy P2 when only the previous time slot T1 and this time slot T2 are considered is a value obtained by subtracting the opposite value of the accumulated charge / discharge energy Pa at the end of the time slot T1 from the charge / discharge energy P3 of the time slot T2.

[0062] The inverse value of the accumulated charge / discharge power amount Pa at the end of the time slot T2 is added to the initial planned value of the subsequent time slot T before the planned value is determined. In this way, by adding the inverse value of the accumulated charge / discharge power amount Pa at the end of a certain time slot T to the planned value of the subsequent time slot T to change the planned value, the actual value of the supply power amount P1 can be brought closer to the planned value and the accumulated charge / discharge power amount Pa of the power storage system 3 can be brought closer to zero. In other words, the storage capacity can be reduced while suppressing the imbalance. For example, the storage capacity can be reduced to about one-fifth (about 80% reduction) compared to the case where power is supplied continuously for several days without changing the planned value as described above.

[0063] In one embodiment, the above-mentioned time period T2 may be the shortest time period from the end of the time period T1 among the time periods for which the planned value is not determined at the end of the time period T1. This makes it possible to cancel the change in the accumulated charge / discharge power amount Pa that occurred in the time period T1 as quickly as possible. The effect of reducing the storage capacity by reducing the change in the accumulated charge / discharge power amount Pa can be further enhanced.

[0064] FIG. 11 is a diagram showing an example of processing (control method) executed in the control system 1. Several processes executed on the day before the planning target date and on the planning target date are indicated with reference numerals. The processing of step S11 is executed on the day before by the generation unit 51. The processing of steps S21 to S27 is executed on the planning target date by the control unit 52. The processing of steps S31 to S37 is executed on the planning target date by the change unit 53. Explanations of contents that overlap with those above will be omitted as appropriate.

[0065] In step S11, an initial planned value is generated. The generation unit 51 generates an initial planned value of the amount of power P1 to be supplied to the power grid G ​​in each of a plurality of time slots T on the planned target day. The generation unit 51 submits (transmits to the command system 7) the generated initial planned value. In this example, the initial planned value is generated and submitted by 12:00 on the day before the planned target day.

[0066] In step S21, power supply is controlled based on the initial planned value. The planned value for this time slot T (0:00 to 0:30) is fixed as the initial planned value. The control unit 52 of the control device 5 controls the power conversion device 4 so that the actual value of the amount of power P1 supplied to the power grid G ​​approaches the initial planned value. The fluctuation value of the amount of power generated P2 of the power generation device 2 is absorbed as the amount of charging and discharging power P3 of the storage system 3. The integrated amount of charging and discharging power Pa of the storage system 3 changes accordingly.

[0067] In step S31, the planned value is changed. The change unit 53 of the control device 5 changes the planned value by adding the opposite value of the accumulated charge / discharge power amount Pa at the end (0:30) of the time slot T in the previous step S21 to the original planned value for the time slot T (2:00 to 2:30 in this example) before the planned value is determined. The changed planned value is transmitted (submitted) to the command system 7. The change and submission of the planned value are performed by the gate close time (1:00 in this example) of the time slot T to be changed.

[0068] The same processes as those in steps S21 and S31 described above are executed in steps S22 to S24 and steps S32 to S34.

[0069] In step S22, power supply is controlled based on the original planned value during that time slot T (0:30 to 1:00). In step S32, the inverse value of the integrated charge / discharge power amount Pa at the end (1:00) of time slot T in step S22 is added to the original planned value for time slot T (2:30 to 3:00 in this example) before the planned value was determined, thereby changing the planned value.

[0070] In step S23, power supply is controlled based on the original planned value during that time slot T (1:00 to 1:30). In step S33, the inverse value of the integrated charge / discharge power amount Pa at the end (1:30) of time slot T in step S23 is added to the original planned value for time slot T (3:00 to 3:30 in this example) before the planned value was determined, thereby changing the planned value.

[0071] In step S24, power supply is controlled based on the original planned value during that time slot T (1:30-2:00). In step S34, the inverse value of the integrated charge / discharge power amount Pa at the end (2:00) of time slot T in step S24 is added to the original planned value for time slot T (3:30-4:00 in this example) before the planned value was determined, thereby changing the planned value.

[0072] In step S25, power supply is controlled based on the changed planned value. The control unit 52 controls the power conversion device 4 so that the actual value of the amount of power P1 supplied to the power grid G ​​approaches the changed planned value. The fluctuation value of the amount of power generated P2 of the power generation device 2 is absorbed by the (further) charging / discharging amount of power P3 of the storage system 3.

[0073] Here, the time zone T (0:00 to 0:30) in the previous step S21 is defined as time zone T1, and the time zone T (2:00 to 2:30) in this step S25 is defined as time zone T2. As described above with reference to Fig. 9, when only time zone T1 and time zone T2 are considered, the integrated charge / discharge power amount Pa at the end of time zone T2 is a value obtained by subtracting the inverse value of the integrated charge / discharge power amount Pa at the end of time zone T1 from the charge / discharge power amount P3 in time zone T2. Therefore, the integrated charge / discharge power amount Pa of the power storage system 3 is brought close to zero.

[0074] In step S35, the planned value is changed. The change unit 53 of the control device 5 changes the planned value by adding the opposite value of the integrated charge / discharge power amount Pa at the end (2:30) of the time slot T in the previous step S25 to the original planned value for the time slot T (for example, 4:00 to 4:30) before the planned value is determined. The changed planned value is transmitted (submitted) to the command system 7.

[0075] The same processes as those in steps S25 and S35 above are executed in steps S26 to S27 and steps S36 to S37.

[0076] In step S26, power control is performed based on the changed planned value during that time slot T (2:30-3:00). In step S36, the inverse value of the integrated charge / discharge power amount Pa at the end (3:00) of time slot T in step S26 is added to the original planned value for time slot T (e.g., 4:30-5:00) before the planned value was determined, thereby changing the planned value.

[0077] In step S27, power control is performed based on the changed planned value during the time slot T (3:00 to 3:30). In step S37, the inverse value of the integrated charge / discharge power amount Pa at the end (3:30) of the time slot T in step S27 is added to the original planned value for the time slot T (e.g., 5:00 to 5:30) before the planned value was determined, thereby changing the planned value.

[0078] By repeatedly executing the above-described process, the actual value of the supply power amount P1 can be brought closer to the planned value, and the integrated charge / discharge power amount Pa of the power storage system 3 can be brought closer to zero. That is, the power storage capacity can be reduced while suppressing the imbalance.

[0079] 12 is a diagram showing an example of a hardware configuration of a device. A computer or the like having the illustrated hardware configuration functions as the control device 5 described above. The control device 5 includes a communication device 5a, a display device 5b, a hard disk drive (HDD) 5c, a memory 5d, and a processor 5e, which are interconnected by a bus or the like.

[0080] The communication device 5a is a network interface card or the like, and enables communication with other devices. The display device 5b is, for example, a touch panel, a display, etc. The HDD 5c functions as a storage unit 50, and stores, for example, a control program 500.

[0081] The processor 5e reads the control program 500 from the HDD 5c or the like and loads it in the memory 5d, thereby causing the computer to function as the control device 5. The functions as the control device 5 include the functions of the generation unit 51, the control unit 52, and the change unit 53, which have been described above.

[0082] The control program 500 can be distributed via a network such as the Internet. The control program 500 can also be recorded on a computer-readable recording medium such as a hard disk, a flexible disk (FD), a CD-ROM, a magneto-optical disk (MO), or a digital versatile disk (DVD), and can be executed by being read out from the recording medium by a computer.

[0083] The disclosed technology is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, the prediction regarding the power generation of the power generation device 2 is performed in the prediction server 6. However, the function of the prediction server 6 may be incorporated 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. Any device that measures natural energy and generates power may be used as the power generation device 2.

[0084] The techniques described above are specified as follows, for example. One of the techniques disclosed is a control method. As described with reference to Figs. 1 to 4 and Figs. 8 to 11, the control method includes generating an initial planned value of the amount of power P1 supplied to the power grid G ​​in each of a plurality of time periods T (step S11), controlling the power supply to the power grid G ​​using the power generated by the power generation device 2 and the charging / discharging power of the power storage system 3 so that the actual value of the amount of power P1 supplied to the power grid G ​​approaches the planned value in the time period T after the planned value is determined (steps S21 to S27), and changing the planned value in the time period T before the planned value is determined so that the integrated charging / discharging power amount Pa of the power storage system 3 approaches zero (steps S31 to S37), and the controlling (steps S21 to S27) includes controlling the power supply to the power grid G ​​so that the actual value of the amount of power supplied P1 approaches the changed planned value (steps S25 to S27).

[0085] According to the above control method, not only the actual value of the amount of power P1 supplied to the power grid G ​​is brought closer to the planned value, but also the integrated charge / discharge power amount Pa of the power storage system 3 is brought closer to zero. Since the change in the integrated charge / discharge power amount Pa is suppressed, the required storage capacity of the power storage system 3 is correspondingly smaller. Therefore, it is possible to reduce the storage capacity while suppressing the imbalance.

[0086] As described with reference to Figures 8 to 11 etc., changing the planned value (steps S31 to S37) may include adding a value opposite to the charge / discharge power amount P3 of the power storage system 3 at the end of a time slot T (e.g., time slot T1) after the planned value is determined, to the planned value of a time slot T (e.g., time slot T2) before the planned value is determined. For example, by canceling out the change in the accumulated charge / discharge power amount Pa that occurred in the previous time slot T in the later time slot T in this way, the accumulated charge / discharge power amount Pa of the power storage system 3 can be brought close to zero.

[0087] As described with reference to Figs. 8 to 11, changing the planned value (steps S31 to S37) may include changing the planned value of the time slot T before the plan value is determined that is the shortest from the end of the time slot T after the plan value is determined. This makes it possible to cancel out the change in the accumulated charge / discharge power amount Pa that occurred in the previous time slot T in the shortest time possible. By reducing the change in the accumulated charge / discharge power amount Pa, the effect of reducing the storage capacity can be further enhanced.

[0088] As described with reference to Fig. 1, Fig. 3, Fig. 11, etc., the multiple time periods T are multiple time periods T obtained by dividing the planning target date, and generating an initial planning value (step S11) may include submitting the initial planning value to the power transmission and distribution company that manages the power grid G ​​(for example, sending it to the command system 7) by the day before the planning target date, and changing the planning value (steps S31 to S37) may include submitting the changed planning value to the power transmission and distribution company (for example, sending it to the command system 7) on the planning target date. This makes it possible to reduce the storage capacity while suppressing imbalance when supplying power to the power grid G ​​managed by the power transmission and distribution company.

[0089] 1 to 5 and 8 to 11, etc., power generation by the power generation device 2 includes power generation using natural energy, generating an initial planned value (step S11) may include generating a predicted value of the amount of power generated P2 of the power generation device 2 as the initial planned value, and controlling (steps S21 to S27) may include absorbing a fluctuation value from the predicted value of the amount of power generated P2 of the power generation device 2 by the amount of charge / discharge power P3 of the power storage system 3. For example, in this manner, it is possible to control the supply of power to the power grid G ​​using the power generated by the power generation device 2 and the power charged / discharged by the power storage system 3.

[0090] The control system 1 described with reference to Figs. 1 to 4 and Figs. 8 to 11 is also one of the disclosed techniques. The control system 1 includes a generating unit 51 that generates an initial planned value of the amount of power P1 supplied to the power grid G ​​in each of a plurality of time periods T, a control unit 52 that controls the supply of power to the power grid G ​​using the generated power of the power generation device 2 and the charging / discharging power of the power storage system 3 so that the actual value of the amount of power P1 supplied to the power grid G ​​approaches the planned value in the time period T after the planned value is determined, and a changing unit 53 that changes the planned value in the time period T before the planned value is determined so that the integrated charging / discharging power Pa of the power storage system 3 approaches zero, and the control by the control unit 52 includes controlling the supply of power to the power grid G ​​so that the actual value of the amount of power supplied P1 approaches the changed planned value. With such a control system 1, it is possible to reduce the storage capacity while suppressing the imbalance, as described above.

[0091] The control program 500 described with reference to Figs. 1 to 4 and Figs. 8 to 12 is also one of the disclosed techniques. The control program 500 causes a computer to execute a process of generating an initial planned value of the amount of power P1 supplied to the power grid G ​​in each of a plurality of time periods T, a process of controlling power supply to the power grid G ​​using the power generated by the power generation device 2 and the charging / discharging power of the power storage system 3 so that the actual value of the amount of power P1 supplied to the power grid G ​​approaches the planned value in the time period T after the planned value is determined, and a process of changing the planned value in the time period T before the planned value is determined so that the integrated charging / discharging power Pa of the power storage system 3 approaches zero. The control process includes a process of controlling the power supply to the power grid G ​​so that the actual value of the amount of power supplied P1 approaches the changed planned value. With such a control program 500, it is possible to reduce the storage capacity while suppressing the imbalance, as described above.

[0092] Some examples of combinations of the disclosed technical features are set out below. (1) Generating an initial planned value of an amount of power to be supplied to the power grid for each of a plurality of time periods; controlling power supply to the power grid using power generated by a power generation device and power charged and discharged by a power storage system so that an actual value of an amount of power supplied to the power grid approaches the planned value during a time period after the planned value is determined; Changing a planned value for a time period before the planned value is determined so that an integrated charge / discharge power amount of the power storage system approaches zero; Including, The controlling includes controlling the supply of power to the power grid so that an actual value of the amount of supplied power approaches the changed planned value. Control methods. (2) Changing the planned value includes adding a value opposite to the charge / discharge power amount of the power storage system at the end of the time slot after the planned value is determined to the planned value of the time slot before the planned value is determined. The control method described in (1). (3) Changing the planned value includes changing the planned value of a time period before the plan value is determined that is the shortest from the end of the time period after the plan value is determined, A control method according to (1) or (2). (4) The plurality of time periods are obtained by dividing a planning target date, Generating the initial planned value includes submitting the initial planned value to a power transmission and distribution business operator that manages the power grid by the day before the planned date; Changing the planned value includes submitting the changed planned value to the electricity transmission and distribution business operator on the planning target date. The control method according to any one of (1) to (3). (5) The power generation by the power generation device includes power generation using natural energy, generating the initial planned value includes generating a predicted value of a power generation amount of the power generation device as the initial planned value; The controlling includes absorbing a fluctuation value from the predicted value of the amount of power generated by the power generation device by the amount of charge / discharge power of the power storage system. The control method according to any one of (1) to (4). (6) A generating unit that generates an initial planned value of an amount of power to be supplied to the power grid in each of a plurality of time periods; a control unit that controls power supply to the power grid using power generated by a power generation device and power charged and discharged by a power storage system so that an actual value of an amount of power supplied to the power grid approaches a planned value during a time period after a planned value is determined; A change unit that changes a planned value for a time period before the planned value is determined so as to bring an integrated charge / discharge power amount of the power storage system closer to zero; Equipped with The control by the control unit includes controlling the supply of power to the power grid so that an actual value of the amount of supplied power approaches the changed planned value. Control system. (7) On the computer, A process of generating an initial planned value of an amount of power to be supplied to the power grid for each of a plurality of time periods; A process of controlling power supply to the power grid using power generated by a power generation device and power charged and discharged by a power storage system so that an actual value of an amount of power supplied to the power grid approaches a planned value during a time period after the planned value is determined; A process of changing a planned value for a time period before the planned value is determined so as to bring an integrated charge / discharge power amount of the power storage system closer to zero; Run the command, The control process includes a process of controlling power supply to the power grid so as to bring the actual value of the supplied power amount closer to the changed planned value. Control program. [Explanation of symbols]

[0093] 1. Control System 2. Power generation equipment 3. Energy storage system 4. Power conversion device 5. Control device 51 Generation part 52 Control section 53 Changes 50 Storage section 500 Control Program 6 Prediction Server 7 Command System G power grid P1 Supply power amount P2 Power generation amount P3 Charge / discharge energy Pa Accumulated charge / discharge power T Time Zone T1 Time Zone T2 Time Zone

Claims

1. Generating an initial planned value of an amount of power to be supplied to the power grid for each of a plurality of time periods; controlling power supply to the power grid using power generated by a power generation device and power charged and discharged by a power storage system so that an actual value of an amount of power supplied to the power grid approaches the planned value during a time period after the planned value is determined; Changing a planned value for a time period before the planned value is determined so that an integrated charge / discharge power amount of the power storage system approaches zero; Including, The controlling includes controlling the supply of power to the power grid so that an actual value of the amount of supplied power approaches the changed planned value. Control methods.

2. Changing the planned value includes adding a value opposite to the charge / discharge power amount of the power storage system at the end of the time slot after the planned value is determined to the planned value of the time slot before the planned value is determined. The control method according to claim 1 .

3. Changing the planned value includes changing the planned value of a time period before the plan value is determined that is the shortest from the end of the time period after the plan value is determined, The control method according to claim 1 or 2.

4. The plurality of time periods are obtained by dividing a planning target date, Generating the initial planned value includes submitting the initial planned value to a power transmission and distribution business operator that manages the power grid by the day before the planned date; Changing the planned value includes submitting the changed planned value to the electricity transmission and distribution business operator on the planning target date. The control method according to claim 1 or 2.

5. The power generation by the power generation device includes power generation using natural energy, generating the initial planned value includes generating a predicted value of a power generation amount of the power generation device as the initial planned value; The controlling includes absorbing a fluctuation value from the predicted value of the amount of power generated by the power generation device by the amount of charge / discharge power of the power storage system. The control method according to claim 1 or 2.

6. A generating unit that generates an initial planned value of an amount of power to be supplied to the power grid in each of a plurality of time periods; a control unit that controls power supply to the power grid using power generated by a power generation device and power charged and discharged by a power storage system so that an actual value of an amount of power supplied to the power grid approaches a planned value during a time period after a planned value is determined; A change unit that changes a planned value for a time period before the planned value is determined so as to bring an integrated charge / discharge power amount of the power storage system closer to zero; Equipped with The control by the control unit includes controlling the supply of power to the power grid so that an actual value of the amount of supplied power approaches the changed planned value. Control system.

7. On the computer, A process of generating an initial planned value of an amount of power to be supplied to the power grid for each of a plurality of time periods; A process of controlling power supply to the power grid using power generated by a power generation device and power charged and discharged by a power storage system so that an actual value of an amount of power supplied to the power grid approaches a planned value during a time period after the planned value is determined; A process of changing a planned value for a time period before the planned value is determined so as to bring an integrated charge / discharge power amount of the power storage system closer to zero; Run the command, The control process includes a process of controlling power supply to the power grid so as to bring the actual value of the supplied power amount closer to the changed planned value. Control program.

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