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 Art

[0002] For example, as known from Patent Document 1, when a power retailer or the like supplies power to the power grid, a planned value of the power supply amount is submitted to the power transmission and distribution operator in advance. When an imbalance occurs in which the actual value of the power supply amount 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

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to suppress the imbalance, it is conceivable to supply power as planned by using the charge and discharge of the energy storage system. However, using an energy storage system with a large energy storage capacity increases costs.

[0005] One aspect of the present disclosure is to reduce the energy storage capacity while suppressing the imbalance.

Means for Solving the Problems

[0006] A control method relating to one aspect of this disclosure includes generating an initial planned value for the amount of electricity supplied to the power grid in each of several time periods, controlling the power supply to the power grid using the generated power of power generators and the charge / discharge power of energy storage systems so that the actual amount of electricity supplied to the power grid in the time period after the planned value has been determined approaches the planned value, and changing the planned value in the time period before the planned value was determined so that the cumulative charge / discharge amount of energy storage systems approaches zero, and the control includes controlling the power supply to the power grid so that the actual amount of electricity supplied approaches the changed planned value.

[0007] A control system relating to one aspect of this disclosure includes: a generation unit that generates initial planned values ​​for the amount of electricity supplied to the power grid in each of several time periods; a control unit that controls the supply of electricity to the power grid using the generated power of a power generation device and the charge / discharge power of a storage system so that the actual amount of electricity supplied to the power grid in the time period after the planned values ​​have been determined approaches the planned values; and a modification unit that modifies the planned values ​​in the time period before the planned values ​​were determined so that the cumulative charge / discharge amount of the storage system approaches zero. The control by the control unit includes controlling the supply of electricity to the power grid so that the actual amount of electricity supplied approaches the modified planned values.

[0008] A control program relating to one aspect of this disclosure causes a computer to perform the following processes: generate an initial planned value for the amount of electricity supplied to the power grid for each of several time periods; control the supply of electricity to the power grid using the generated power of a power generation device and the charge / discharge power of a storage system so that the actual value of the amount of electricity supplied to the power grid in the time period after the planned value has been determined approaches the planned value; and modify the planned value for the time period before the planned value was determined so that the cumulative charge / discharge amount of the storage system approaches zero. The control process includes controlling the supply of electricity to the power grid so that the actual value of the amount of electricity supplied approaches the modified planned value. [Effects of the Invention]

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

[0010] [Figure 1] This figure shows an example of the schematic configuration of the control system 1 according to the embodiment. [Figure 2] This figure shows an example of a power converter 4. [Figure 3] This figure shows an example of the initial planned values. [Figure 4] This figure shows an example of a prediction result. [Figure 5] This figure shows an example of how the energy storage system 3 absorbs fluctuations in the amount of electricity generated P2. [Figure 6] This figure shows an example of how the energy storage system 3 absorbs fluctuations in the amount of electricity generated P2. [Figure 7] This figure shows an example of the relationship between the cumulative charge / discharge power amount Pa of the energy storage system 3 and the required energy storage capacity. [Figure 8] This figure shows an example of changing the planned values ​​and power control for time period T. [Figure 9] This figure shows an example of changing the planned values ​​and power control for time period T. [Figure 10] This figure shows an example of changing the planned values ​​and power control for time period T. [Figure 11] This figure shows an example of a process (control method) executed in control system 1. [Figure 12] This figure shows an example of the device's hardware configuration. [Modes for carrying out the invention]

[0011] The embodiments will be described below with reference to the drawings. The same elements will be denoted by the same reference numerals, and redundant descriptions will be omitted as appropriate.

[0012] Figure 1 shows an example of the schematic configuration of a control system 1 according to an embodiment. The control system 1 is connected to a power generator 2 and a power grid G, and can communicate with several external devices or systems. Examples of external devices and systems include a prediction server 6 and a command system 7.

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

[0014] The control system 1 supplies power to the power grid G or takes in power from the power grid G. In this embodiment, in particular, it is assumed that 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 alternating current power. The amount of that power is referred to as the supplied power amount P1 and is illustrated.

[0015] 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. Note that 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 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 that case, the power generation device 2 may be a wind power generation device, a solar power generation device, etc. The generated power of the power generation device 2 may be direct current power or alternating current power. The amount of that power is referred to as the 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 the power conversion device 4. The power storage system 3 charges at least a part of the generated power of 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 that case, the charge and discharge power of the storage battery becomes the charge and discharge 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 storage batteries. For example, a fuel cell may be used, in which case power is stored as hydrogen. The charge and discharge power of the power storage system 3 may be DC power. The amount of that power is referred to as the charge and discharge power amount P3 and is illustrated. Unless otherwise specified, among the charge and discharge power amounts P3, the discharge power amount is represented by a positive value and the charge power amount is represented by a negative value.

[0018] Note that information regarding the charge and discharge of the power storage system 3 is grasped (monitored, etc.) by the changing unit 53 of the control device 5 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 power conversions. The power conversion of the power conversion device 4 may include boosting or降压 DC power, converting DC power to AC power, converting AC power to DC power, etc. The power conversion device 4 is also referred to as 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 of the power conversion device 4.

[0020] The power conversion device 4 supplies power to the power grid G using the generated power of 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 generated power of 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 discharge 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. Also, the power conversion device 4 converts the generated power of 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 converter 4 may be configured to include a plurality of power converters. This will be explained with reference to Figure 2.

[0022] Figure 2 shows an example of a power converter 4. In this example, the power converter 4 includes a power converter 42 and a power converter 43. The power converter 42 is connected between the power generator 2, the power converter 43, and the power grid G. The power converter 42 supplies the power generated by the power generator 2 to the power grid G ​​or to the power converter 43. The power converter 43 is connected between the energy storage system 3, the power converter 42, and the power grid G. The power converter 43 charges the energy storage system 3 with power from the power converter 42 (power generated by the power generator 2) or supplies the discharged power of the energy storage system 3 to the power grid G.

[0023] Note that the configuration of the power converter 4 shown in Figure 2 is merely one example. Any configuration that can realize the operation required of the power converter 4 in the control system 1 may be adopted.

[0024] Returning to Figure 1, the sum of the power generated by the power generator 2 and the charge / discharge power of the energy storage system 3 becomes the power supplied to the power grid G. In terms of energy quantity, the sum of the generated energy quantity P2 and the charge / discharge energy quantity P3 becomes the supplied energy quantity P1 (P1 = P2 + P3). Information regarding the supplied energy quantity P1 is also obtained (monitored, etc.) by the modification unit 53 of the control device 5, which will be described later.

[0025] The control device 5 controls the power supply to the power grid G ​​by controlling the power converter 4. The control device 5 includes a storage unit 50, a generation unit 51, a control unit 52, and a modification unit 53.

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

[0027] The generation unit 51 generates a planned value for the supplied power amount P1. The planned value generated by the generation unit 51 is also referred to as the initial planned value. Please refer to Figure 3 for further explanation.

[0028] Figure 3 shows an example of the initial planned values. The initial planned values ​​are the planned amount of electricity supplied P1 on a specific future day that is the subject of the planning. The day that is the subject of the planning is also called the planning target day.

[0029] The planned day includes multiple time zones T obtained by dividing that day. Each time zone T has a given duration (unit period) and is also called a "frame" or "time slot". An example of the length of a time zone T is 30 minutes, in which case the period from 0:00 to 24:00 on the planned day is divided into 48 time zones T. The initial planned values ​​include the planned values ​​of the amount of electricity P1 supplied to the power grid G ​​in each of the multiple time zones T.

[0030] Returning to Figure 1, the generation unit 51 generates the initial planned values ​​as described above based on the predicted power generation results of the power generator 2. In the example shown in Figure 1, the prediction server 6 predicts the power generation of the power generator 2 on the planned date and transmits the prediction results to the control device 5. For example, the predicted value of the power generated or the amount of power generated P2 of the power generator 2 is calculated based on weather information (wind speed, solar radiation, temperature, etc.) at the installation site of the power generator 2. Various algorithms or trained models may be used for the calculation. The prediction results will be explained with reference to Figure 4.

[0031] Figure 4 shows an example of the prediction results. In this example, the prediction results include the predicted amount of electricity P2 generated by the power generator 2 for each of several time periods T on the planned day. Each time period T corresponds to each time period T in Figure 2 above.

[0032] Returning to Figure 1, for example, the prediction results shown above are sent from the prediction server 6 to the control device 5. The generation unit 51 generates the initial planned values ​​based on the prediction results from the prediction server 6. Specifically, the generation unit 51 generates the predicted values ​​of the amount of electricity P2 generated by the power generator 2 for each time period T as the planned values ​​of the amount of electricity supplied P1 for each time period T. For example, the planned values ​​of the amount of electricity supplied P1 for each time period T in Figure 3, as explained earlier, will be the same as the predicted values ​​of the amount of electricity generated P2 for the corresponding time period T in Figure 4.

[0033] The generation unit 51 submits the initially generated planned values ​​to the power transmission and distribution operator that manages the power grid G. In the example shown in Figure 1, the submission is made by transmitting the initial planned values ​​to the command system 7. The generation unit 51 submits the initial planned values ​​by the day before the planned date, more specifically by the deadline. An example of the deadline is 12:00 the day before the planned date.

[0034] The submitted planned values, that is, the planned values ​​for each of the multiple time zones T, are finalized at a predetermined time (e.g., 1 hour) before the start time of that time zone T. This finalization is also called the gate close. In the following explanation, the time at which the planned values ​​are finalized will also be referred to as the gate close time.

[0035] Note that the planned values ​​for time zone T can be changed (or modified) until the gate closing time. Changes to the planned values ​​are made by the modification unit 53, and details will be described later.

[0036] Command System 7 is a system used by power transmission and distribution operators, and is also called the Central Power Dispatch Command System, etc. For example, Command System 7 has various functions that can be used by power transmission and distribution operators for the management and control of the power grid G. Within the bounds of consistency, Command System 7 and power transmission and distribution operators may be interpreted as each other.

[0037] The command system 7 prepares to control the power grid G ​​in order to maintain the power supply and demand balance of the power grid G, based on the initial or revised planned values ​​submitted. For example, in the time period T after the gate closing time when the planned values ​​have been finalized (time period T after the plan has been finalized), the system prepares to control the power grid G ​​assuming that the amount of power supplied P1 according to the planned value will be supplied to the power grid G ​​from the control system 1. At the same time, even if the actual value of the supplied power P1 deviates from the planned value and an imbalance occurs, the system prepares to control the power grid G ​​in order 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, during the time period T after the planned value has been determined, the control unit 52 controls the power converter 4 so that the actual value of the amount of electricity supplied to the power grid G ​​P1 approaches the planned value. As mentioned earlier, the power supply is power generated by the power generator 2 and power charged and discharged by the energy storage system 3.

[0039] For example, the control unit 52 transmits an instruction value to the power converter 4 indicating the magnitude of the power that the power converter 4 will output to the power grid G. The instruction value may be a value obtained by converting the planned amount of supplied power P1 into power. The power converter 4 supplies power to the power grid G ​​according to the instruction value.

[0040] As mentioned earlier, the planned value of the supplied electricity P1 is the same as the predicted value of the electricity generated by power generator 2 P2. Therefore, if the actual value of the electricity generated P2 during time period T is the same as the predicted value for power generator 2, all of the generated electricity P2 will be supplied to the power grid G ​​as supplied electricity P1. The charge and discharge electricity P3 of the energy storage system 3 will be zero.

[0041] However, the amount of electricity P2 generated by the renewable energy power generation device 2 often deviates from the predicted value. This deviation is absorbed by the energy storage system 3. Please refer to Figures 5 and 6 for further explanation.

[0042] Figures 5 and 6 show examples of how the energy storage system 3 absorbs fluctuations in generated electricity P2. In Figure 5, the dashed line graph shows the predicted value of generated electricity P2. The solid line graph shows the actual value of generated electricity P2. In Figure 6, the dashed line graph shows the planned value of supplied electricity P1. The solid line graph shows the actual value of supplied electricity P1.

[0043] As shown in Figure 5, there are periods when the actual value of generated electricity P2 differs from the predicted value. During periods when the generated electricity P2 fluctuates so that the actual value is greater than the predicted value, an amount of electricity corresponding to that fluctuation (shown as area F1) is charged into the energy storage system 3. Conversely, during periods when the generated electricity P2 fluctuates so that the actual value is less than the predicted value, an amount of electricity corresponding to that fluctuation (shown as area F2) is discharged from the energy storage system 3. As a result, as shown in Figure 6, the actual value of supplied electricity P1 is brought closer to the planned value. Note that bringing the actual value closer to the planned value can be understood as including making the actual value match the planned value.

[0044] Returning to Figure 1, for example, by absorbing the fluctuations from the predicted value of the power generation amount P2 of the power generation device 2 as the charge / discharge power amount P3 of the energy storage system 3, the actual value of the power supply amount P1 to the power grid G ​​can be brought closer to the planned value. However, in this case, there is a problem that the integrated value of the charge / discharge power amount P3 of the energy storage system 3 may become large. If this integrated value changes significantly, the required storage capacity of the energy storage system 3 will also increase. Please refer to Figure 7 for further explanation. Hereafter, the integrated value of the charge / discharge power amount P3 of the energy storage system 3 will also be referred to as the integrated charge / discharge power amount Pa.

[0045] Figure 7 shows an example of the relationship between the cumulative charge / discharge energy Pa of the energy storage system 3 and the required storage capacity. The horizontal axis of the graph represents time. The vertical axis of the graph represents the cumulative charge / discharge energy Pa. As time progresses, the cumulative charge / discharge energy Pa changes in accordance with the charging and discharging of the energy storage system 3.

[0046] The amount of energy equivalent to the difference between the maximum and minimum values ​​of the cumulative charge / discharge energy Pa is the required storage capacity. In particular, if the charging and discharging of the energy storage system 3 is biased towards charging or discharging, the change in the cumulative charge / discharge energy Pa will be large. The larger the change in the cumulative charge / discharge energy Pa, the larger the difference between its maximum and minimum values, and therefore the larger the storage capacity.

[0047] By reducing the change in the cumulative charge / discharge energy Pa, the energy storage capacity can be reduced. To this end, in this embodiment, the planned values ​​are changed as described below.

[0048] Returning to Figure 1, modification unit 53 changes the planned value for the time period T before the planned value is finalized, so that the cumulative charge / discharge power amount Pa of the energy storage system 3 approaches zero. Please also refer to Figures 8 to 10 for further explanation.

[0049] Figures 8 to 10 show examples of changes to planned values ​​and power control for time zone T. For ease of understanding, two different time zones T on the same planned day are also referred to as time zone T1 and time zone T2. Time zone T2 is a later time zone than time zone T1. It is assumed that the cumulative charge / discharge power Pa of the energy storage system 3 at the start of time zone T1 is zero.

[0050] Figure 8 shows the power control for time period T1 after the planned values ​​have been finalized. As mentioned earlier, the initial planned values ​​are the same as the predicted value of the amount of electricity P2 generated by power generator 2 during time period T1.

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

[0052] The fluctuations in the generated electricity P2 are absorbed as the charging and discharging electricity P3 of the energy storage system 3. As a result, the actual value of the supplied electricity P1 becomes the initially planned value.

[0053] The cumulative charge / discharge energy Pa of the energy storage system 3 changes by the amount of charge / discharge energy P3 of the energy storage system 3 during the above time period T1. In this example, as mentioned above, the cumulative charge / discharge energy Pa at the start of time period T1 is zero, so the cumulative charge / discharge energy Pa at the end of time period T1 will be the charge / discharge energy P3 (Pa = P3).

[0054] The modification unit 53 changes the planned value for the time period T2 before the planned value is finalized, so that the cumulative charge / discharge power amount Pa of the energy storage system 3 approaches zero.

[0055] Figure 9 shows the change in the planned value for time period T2 before the planned value is finalized. The initial planned value is the predicted value of the amount of electricity P2 generated by power generator 2 during time period T2. The planned value for time period T2 is changed from the initial planned value. This change is made to cancel out the change in the cumulative charge / discharge energy Pa that occurred during the preceding time period T1. Specifically, the modification unit 53 adds (adds) a value to the planned value for time period T2 that is the opposite of the cumulative charge / discharge energy Pa at the end of the preceding time period T1, that is, a value with the sign of the cumulative charge / discharge energy Pa reversed.

[0056] The modification unit 53 submits the revised planned values ​​(sent them to the command system 7). The modification unit 53 submits the revised planned values ​​for time zone T2 sometime during the planned day, more specifically by the gate closing time of time zone T2. After that, at the gate closing time, the planned values ​​for time zone T2 are finalized.

[0057] Figure 10 shows the power control for time period T2 after the planned values ​​have been finalized. As mentioned earlier, the revised planned values ​​are the original planned values ​​(=predicted value of generated power P2) plus the value inversely to the charge / discharge power P3 for time period T1.

[0058] During the time period T2 after the planned value has been finalized, the control unit 52 controls the power converter 4 so that the actual value of the amount of electricity supplied to the power grid G ​​P1 approaches the revised planned value.

[0059] If the actual amount of electricity generated by power generator 2 in time period T2 is the same as the planned value, then in time period T2, the energy storage system 3 will charge and discharge an amount of electricity that is the opposite of the amount of electricity charged and discharged in the preceding time period T1 (P3). The amount of electricity charged and discharged by the energy storage system 3 in time period T2 (P3) will be the opposite of the cumulative amount of electricity charged and discharged at the end of time period T1 (Pa). As a result, the cumulative amount of electricity charged and discharged at the end of time period T2 (calculated using only time periods T1 and T2) will be zero. In this way, by adding the opposite value of the cumulative amount of electricity charged and discharged at the end of time period T1 (Pa) to the planned value for the following time period T2, the cumulative amount of electricity charged and discharged by the energy storage system 3 (Pa) can be brought closer to zero.

[0060] However, as shown in Figure 10, even during time period T2, the amount of electricity generated by power generator 2 P2 may fluctuate from the predicted value. This fluctuation is absorbed as the amount of electricity charged and discharged by energy storage system 3 P3. The actual value of the supplied electricity P1 will be the initially planned value.

[0061] The cumulative charge / discharge energy Pa of the energy storage system 3 changes by the amount of charge / discharge energy P3 of the energy storage system 3 described above. The cumulative charge / discharge energy Pa at the end of the generated energy P2 when considering only the time period T1 and this time period T2 is the value obtained by subtracting the inverse value of the cumulative charge / discharge energy Pa at the end of time period T1 from the charge / discharge energy P3 of time period T2.

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

[0063] In one embodiment, the above-described time period T2 may be the shortest time period from the end of time period T1 among the time periods in which the planned value has not been determined at the end of time period T1. This makes it possible to cancel out the change in the cumulative charge / discharge energy amount Pa that occurred in time period T1 in the shortest possible time. This further enhances the effect of reducing the energy storage capacity by minimizing the change in the cumulative charge / discharge energy amount Pa.

[0064] Figure 11 shows an example of the processes (control methods) executed in the control system 1. Several processes executed on the day before the planned date and on the planned date are indicated by reference numerals. The process in step S11 is executed by the generation unit 51 on the day before. The processes in steps S21 to S27 are executed by the control unit 52 on the planned date. The processes in steps S31 to S37 are executed by the modification unit 53 on the planned date. Explanations of content that overlaps with what has been said so far will be omitted as appropriate.

[0065] In step S11, the initial planned values ​​are generated. The generation unit 51 generates the initial planned values ​​for the amount of electricity P1 supplied to the power grid G ​​for each of the multiple time periods T on the planned day. The generation unit 51 submits the generated initial planned values ​​(sends them to the command system 7). In this example, the initial planned values ​​are generated and submitted by 12:00 the day before the planned day.

[0066] In step S21, the power supply is controlled based on the initial planned values. The planned values ​​for this time period T (0:00~0:30) are fixed at the initial planned values. The control unit 52 of the control device 5 controls the power converter 4 so that the actual value of the amount of electricity supplied to the power grid G ​​P1 approaches the initial planned value. The fluctuation in the amount of electricity generated P2 by the power generator 2 is absorbed as the amount of electricity charged and discharged by the energy storage system 3 P3. As a result, the cumulative amount of electricity charged and discharged by the energy storage system 3 Pa changes.

[0067] In step S31, the planned value is changed. The modification unit 53 of the control device 5 modifies the planned value by adding a value opposite to the accumulated charge / discharge energy Pa at the end of time period T (0:30) in step S21 to the original planned value for time period T before the planned value was finalized (in this example, 2:00-2:30). The modified planned value is transmitted (submitted) to the command system 7. The modification and submission of the planned value are carried out by the gate closing time of the time period T to be modified (in this example, 1:00).

[0068] The same processes as those described in steps S21 and S31 are executed in steps S22 to S24 and steps 32 to S34.

[0069] In step S22, power supply is controlled based on the initial planned value during the time period T (0:30 to 1:00). In step S32, the value inverse of the cumulative charge / discharge energy Pa at the end of time period T in step S22 (1:00) is added to the initial planned value for time period T before the planned value was finalized (2:30 to 3:00 in this example), and the planned value is changed.

[0070] In step S23, power supply is controlled based on the initial planned value during the time period T (1:00 to 1:30). In step S33, the value inverse to the cumulative charge / discharge energy Pa at the end of time period T in step S23 (1:30) is added to the initial planned value for time period T before the planned value was finalized (3:00 to 3:30 in this example), and the planned value is changed.

[0071] In step S24, power supply is controlled based on the initial planned value during the time period T (1:30-2:00). In step S34, the value inverse to the cumulative charge / discharge energy Pa at the end of time period T in step S24 (2:00) is added to the initial planned value for time period T before the planned value was finalized (3:30-4:00 in this example), and the planned value is changed.

[0072] In step S25, the power supply is controlled based on the revised planned values. The control unit 52 controls the power converter 4 so that the actual value of the amount of electricity supplied to the power grid G ​​P1 approaches the revised planned value. The fluctuation in the amount of electricity generated P2 by the power generator 2 is absorbed by the (further) charge and discharge amount P3 of the energy storage system 3.

[0073] Here, the time period T (0:00~0:30) in step S21 is designated as time period T1, and the time period T (2:00~2:30) in step S25 is designated as time period T2. As explained earlier with reference to Figure 9, when considering only time periods T1 and T2, the cumulative charge / discharge energy Pa at the end of time period T2 is obtained by subtracting the inverse value of the cumulative charge / discharge energy Pa at the end of time period T1 from the charge / discharge energy P3 in time period T2. Therefore, the cumulative charge / discharge energy Pa of the energy storage system 3 is brought closer to zero.

[0074] In step S35, the planned value is changed. The modification unit 53 of the control device 5 modifies the planned value by adding a value opposite to the cumulative charge / discharge energy Pa at the end of time period T (2:30) in step S25 to the original planned value for time period T before the planned value was finalized (for example, 4:00-4:30). The modified planned value is transmitted (submitted) to the command system 7.

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

[0076] In step S26, power control is performed during the time period T (2:30-3:00) based on the revised planned value. In step S36, the value inverse to the cumulative charge / discharge energy Pa at the end of time period T in step S26 (3:00) is added to the original planned value for time period T before the planned value was finalized (for example, 4:30-5:00), and the planned value is changed.

[0077] In step S27, power control is performed during the time period T (3:00-3:30) based on the revised planned value. In step S37, the value inverse to the cumulative charge / discharge energy Pa at the end of time period T in step S27 (3:30) is added to the original planned value for time period T before the planned value was finalized (for example, 5:00-5:30), and the planned value is changed.

[0078] By repeatedly executing the above process, the actual value of the supplied power P1 can be brought closer to the planned value, and the cumulative charge / discharge power Pa of the energy storage system 3 can be brought closer to zero. In other words, the energy storage capacity can be reduced while suppressing imbalance.

[0079] Figure 12 shows an example of the hardware configuration of the device. A computer or the like equipped with the exemplified hardware configuration functions as the control device 5 described above. The control device 5 includes a communication device 5a, a display device 5b, an HDD (Hard Disk Drive) 5c, memory 5d, and a processor 5e, all of which are interconnected by a bus or the like.

[0080] The communication device 5a is a network interface card or the like, enabling communication with other devices. The display device 5b is, for example, a touch panel or a display. The HDD 5c functions as a storage unit 50, storing, 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 into memory 5d, thereby enabling the computer to function as a control device 5. The functions of the control device 5 include the functions of the generation unit 51, the control unit 52, and the modification unit 53, as described above.

[0082] The control program 500 can be distributed via a network such as the Internet. Furthermore, the control program 500 can be recorded on a computer-readable recording medium such as a hard disk, flexible disk (FD), CD-ROM, MO (Magneto-Optical disk), or DVD (Digital Versatile Disc), and executed by reading it from the recording medium by a computer.

[0083] The disclosed technology is not limited to the embodiments described above. For example, in the embodiments described above, the case in which the prediction of power generation of the power generation device 2 is performed by the prediction server 6 was described as an example. However, the functions of the prediction server 6 may be incorporated into the control device 5. The power generation device 2 is not limited to wind power generation devices and solar power generation devices. Any device that generates electricity by measuring natural energy may be used as the power generation device 2.

[0084] The technology described above can be identified, for example, as follows. One of the disclosed technologies is a control method. As explained with reference to Figures 1 to 4 and Figures 8 to 11, the control method includes generating an initial planned value for the amount of electricity supplied to the power grid G ​​P1 in each of several time periods T (step S11), controlling the power supply to the power grid G ​​using the power generated by the power generator 2 and the charge / discharge power of the energy storage system 3 in the time period T after the planned value has been determined, so as to bring the actual value of the amount of electricity supplied to the power grid G ​​P1 closer to the planned value (steps S21 to S27), and changing the planned value for the time period T before the planned value was determined so as to bring the cumulative charge / discharge amount Pa of the energy storage system 3 closer to zero (steps S31 to S37). The control (steps S21 to S27) includes controlling the power supply to the power grid G ​​so as to bring the actual value of the supplied electricity P1 closer to the changed planned value (steps S25 to S27).

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

[0086] As explained with reference to Figures 8 to 11, changing the planned value (steps S31 to S37) may include adding a value inverse to the charge / discharge energy P3 of the energy storage system 3 at the end of the time period T after the planned value has been determined (e.g., time period T1) to the planned value of the time period T before the planned value has been determined (e.g., time period T2). For example, by canceling out the change in the cumulative charge / discharge energy Pa that occurred in the earlier time period T in the later time period T, the cumulative charge / discharge energy Pa of the energy storage system 3 can be brought closer to zero.

[0087] As explained with reference to Figures 8 to 11, changing the planned value (steps S31 to S37) may include changing the planned value for the earliest time period T before the planned value was finalized, starting from the end of the time period T after the planned value was finalized. This makes it possible to cancel out the change in the cumulative charge / discharge energy Pa that occurred in the previous time period T in the shortest possible time. This further enhances the effect of reducing the storage capacity by minimizing the change in the cumulative charge / discharge energy Pa.

[0088] As explained with reference to Figures 1, 3, and 11, the multiple time zones T are multiple time zones T obtained by dividing the planned day. Generating the initial planned values ​​(step S11) includes submitting the initial planned values ​​to the transmission and distribution operator managing the power grid G ​​(for example, by sending them to the command system 7) by the day before the planned day, and changing the planned values ​​(steps S31 to S37) may include submitting the changed planned values ​​to the transmission and distribution operator (for example, by sending them to the command system 7) on the planned day. This makes it possible to reduce the storage capacity while suppressing imbalance when supplying power to the power grid G ​​managed by the transmission and distribution operator.

[0089] As explained with reference to Figures 1 to 5 and Figures 8 to 11, the power generation by the power generation device 2 includes power generation using natural energy, generating the initial planned value (step S11) includes generating the predicted value of the amount of electricity generated by the power generation device 2 P2 as the initial planned value, and controlling it (steps S21 to S27) may include absorbing the fluctuations from the predicted value of the amount of electricity generated by the power generation device 2 P2 with the charge / discharge amount P3 of the energy storage system 3. For example, in this way, the power supply to the power grid G ​​can be controlled using the power generated by the power generation device 2 and the charge / discharge amount of the energy storage system 3.

[0090] The control system 1, described with reference to Figures 1 to 4 and Figures 8 to 11, is also one of the disclosed technologies. The control system 1 includes a generation unit 51 that generates an initial planned value of the amount of electricity P1 supplied to the power grid G ​​in each of several 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 generator 2 and the charge / discharge power of the energy storage system 3 so that the actual value of the amount of electricity P1 supplied to the power grid G ​​in the time period T after the planned value has been determined approaches the planned value, and a modification unit 53 that modifies the planned value in the time period T before the planned value has been determined so that the cumulative charge / discharge amount Pa of the energy storage system 3 approaches zero. 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 electricity supplied P1 approaches the modified planned value. With such a control system 1, as described above, it is possible to reduce the energy storage capacity while suppressing imbalance.

[0091] The control program 500, described with reference to Figures 1 to 4 and Figures 8 to 12, is also one of the disclosed technologies. The control program 500 causes the computer to perform the following processes: generate an initial planned value for the amount of electricity P1 supplied to the power grid G ​​in each of several time periods T; control the power supply to the power grid G ​​using the generated power of the power generator 2 and the charge / discharge power of the energy storage system 3 so that the actual value of the amount of electricity P1 supplied to the power grid G ​​in the time period T after the planned value has been determined approaches the planned value; and modify the planned value for the time period T before the planned value was determined so that the cumulative charge / discharge amount Pa of the energy storage system 3 approaches zero. The control process includes controlling the power supply to the power grid G ​​so that the actual value of the supplied electricity P1 approaches the modified planned value. As described above, even with such a control program 500, it is possible to reduce the energy storage capacity while suppressing imbalances.

[0092] Some examples of the combinations of technical features that will be disclosed are listed below. (1) To generate the initial planned values ​​for the amount of electricity supplied to the power grid for each of several time periods, During the time period after the planned values ​​have been finalized, the power supply to the power grid is controlled using the power generated by the power generation equipment and the charge / discharge power of the energy storage system so that the actual amount of power supplied to the power grid approaches the planned value. To bring the cumulative charge and discharge power of the aforementioned energy storage system closer to zero, the planned values ​​for the time period before the planned values ​​are finalized are changed, Includes, The aforementioned control includes controlling the power supply to the power grid so that the actual value of the supplied power approaches the revised planned value. Control method. (2) Modifying the planned value includes adding a value inverse to the amount of power charged and discharged by the energy storage system at the end of the time period after the planned value has been determined to the planned value for the time period before the planned value was determined. The control method described in (1). (3) Changing the aforementioned planned value includes changing the planned value for the shortest time period before the determination of the planned value, from the end of the time period after the determination of the planned value. The control method described in (1) or (2). (4) The aforementioned multiple time periods are multiple time periods obtained by dividing the target day, Generating the aforementioned initial planned values ​​includes submitting the aforementioned initial planned values ​​to the power transmission and distribution operator managing the power grid by the day before the planned target date. Changing the aforementioned planned value includes submitting the revised planned value to the aforementioned power transmission and distribution operator on the aforementioned planned date. The control method described in any of (1) to (3). (5) The power generation by the aforementioned power generation device includes power generation using renewable energy, Generating the initial planned values ​​includes generating the predicted value of the amount of electricity generated by the power generation device as the initial planned value. The aforementioned control includes absorbing the fluctuations in the amount of power generated by the power generator from the predicted value using the amount of power charged and discharged by the energy storage system. A control method described in any of (1) to (4). (6) A generation unit that generates the initial planned values ​​for the amount of electricity supplied to the power grid for each of several time periods, A control unit controls the power supply to the power grid using the power generated by the power generation equipment and the charge / discharge power of the energy storage system, in order to bring the actual amount of power supplied to the power grid closer to the planned value during the time period after the planned value has been determined. A modification unit that modifies the planned value for the time period before the planned value is finalized so that the cumulative charge and discharge power of the energy storage system approaches zero, Equipped with, The control by the control unit includes controlling the power supply to the power grid so that the actual value of the supplied power approaches the revised planned value. Control system. (7) On the computer, A process to generate the initial planned values ​​for the amount of electricity supplied to the power grid for each of several time periods, During the time period after the planned values ​​have been determined, a process is performed to control the power supply to the power grid using the power generated by the power generation equipment and the charge / discharge power of the energy storage system so that the actual amount of power supplied to the power grid approaches the planned value, The process involves modifying the planned values ​​for the time period before the planned values ​​are finalized, so that the cumulative charge and discharge power of the aforementioned energy storage system approaches zero. Make it run, The control process includes a process for controlling the power supply to the power grid so that the actual value of the supplied power approaches the revised planned value. Control program. [Explanation of symbols]

[0093] 1. Control System 2. Power generation equipment 3. Energy storage system 4 Power converter 5 Control device 51 Generation part 52 Control Unit 53 Changes 50 Storage section 500 control programs 6 Prediction Servers 7. Command System G power grid P1 Supply power amount P2 Electricity generation P3 Charge / discharge energy Pa: Cumulative charge and discharge energy T time zone T1 time zone T2 time zone

Claims

1. To generate the initial planned values ​​for the amount of electricity supplied to the power grid for each of several time periods, During the time period after the planned values ​​have been finalized, the power supply to the power grid is controlled using the power generated by the power generation equipment and the charge / discharge power of the energy storage system so that the actual amount of power supplied to the power grid approaches the planned value. To bring the cumulative charge and discharge power of the aforementioned energy storage system closer to zero, the planned values ​​for the time period before the planned values ​​are finalized are changed, Includes, The following steps are performed in parallel and repeatedly: adding the inverse value of the cumulative charge / discharge power amount obtained at the end of each time period to the shortest time period before gate closure to change the planned value, and submitting the changed planned value to the transmission and distribution company that manages the power grid by the gate closure time; and in each time period after the planned value has been finalized, absorbing the fluctuations from the predicted value of the power generation amount of the power generation equipment with the charge / discharge power amount of the energy storage system to bring the actual value of the supplied power amount closer to the changed planned value. Control method.

2. To generate initial planned values ​​for the amount of electricity supplied to the power grid for each of multiple time periods, During the time period after the planned values ​​have been finalized, the power supply to the power grid is controlled using the power generated by the power generation equipment and the charge / discharge power of the energy storage system so that the actual amount of power supplied to the power grid approaches the planned value. To bring the cumulative charge and discharge power of the aforementioned energy storage system closer to zero, the planned values ​​for the time period before the planned values ​​are finalized are changed, Includes, The aforementioned control includes controlling the power supply to the power grid so that the actual value of the supplied power approaches the revised planned value. The power generation by the aforementioned power generation device includes power generation using renewable energy, Generating the initial planned value includes generating a predicted value for the amount of electricity generated by the power generation device during the same time period as the time period in which the initial planned value is generated, as the initial planned value. The aforementioned control includes absorbing the fluctuations in the amount of power generated by the power generator from the predicted value using the amount of power charged and discharged by the energy storage system. Control method.

3. Modifying the aforementioned planned value includes adding a value inverse to the cumulative charge / discharge power amount of the energy storage system at the end of the time period after the planned value has been determined to the planned value for the time period before the planned value was determined. The control method according to claim 2.

4. The plurality of time periods are a plurality of time periods obtained by dividing the target day for planning, Changing the aforementioned planned value includes changing the planned value for the shortest time period before the determination of the planned value, from the end of the time period after the determination of the planned value. The control method according to claim 2 or 3.

5. The aforementioned multiple time periods are multiple time periods obtained by dividing the target day, Generating the aforementioned initial planned values ​​includes submitting the aforementioned initial planned values ​​to the power transmission and distribution operator managing the power grid by the day before the planned target date. Changing the aforementioned planned value includes submitting the revised planned value to the aforementioned power transmission and distribution operator on the aforementioned planned date. The control method according to claim 1 or 2.

6. The power generation by the aforementioned power generation device includes power generation using renewable energy, Generating the aforementioned initial planned values ​​includes generating the predicted value of the amount of electricity generated by the power generation device as the aforementioned initial planned value. The control method according to claim 1.

7. A generation unit that generates the initial planned values ​​for the amount of electricity supplied to the power grid for each of several time periods, A control unit controls the power supply to the power grid using the power generated by the power generation equipment and the charge / discharge power of the energy storage system, in order to bring the actual amount of power supplied to the power grid closer to the planned value during the time period after the planned value has been determined. A modification unit that modifies the planned value for the time period before the planned value is finalized so that the cumulative charge and discharge power of the energy storage system approaches zero, Equipped with, The control by the control unit includes, in parallel and repeatedly, the following: adding a value inverse to the cumulative charge / discharge power amount acquired at the end of each time period to the shortest time period before gate closure to change the planned value, submitting the changed planned value to the transmission and distribution operator managing the power grid by the gate closure time, and, in each time period after the planned value has been determined, absorbing the fluctuations from the predicted value of the power generation amount of the power generation equipment with the charge / discharge power amount of the energy storage system to bring the actual value of the supplied power amount closer to the changed planned value. Control system.

8. A generation unit that generates the initial planned value of the amount of electricity supplied to the power grid for each of multiple time periods, A control unit controls the power supply to the power grid using the power generated by the power generation equipment and the charge / discharge power of the energy storage system, in order to bring the actual amount of power supplied to the power grid closer to the planned value during the time period after the planned value has been determined. A modification unit that modifies the planned value for the time period before the planned value is finalized so that the cumulative charge and discharge power of the energy storage system approaches zero, Equipped with, The control by the control unit includes controlling the power supply to the power grid so that the actual value of the supplied power approaches the revised planned value. The power generation by the aforementioned power generation device includes power generation using renewable energy, The generation by the generation unit includes generating a predicted value for the amount of electricity generated by the power generation device during the same time period as the planned value, as the initial planned value. The control by the control unit includes absorbing the fluctuations in the amount of power generated by the power generator from the predicted value using the amount of power charged and discharged by the energy storage system. Control system.

9. On the computer, A process to generate the initial planned values ​​for the amount of electricity supplied to the power grid for each of several time periods, During the time period after the planned values ​​have been determined, a process is performed to control the power supply to the power grid using the power generated by the power generation equipment and the charge / discharge power of the energy storage system so that the actual amount of power supplied to the power grid approaches the planned value, The process involves modifying the planned values ​​for the time period before the planned values ​​are finalized, so that the cumulative charge and discharge power of the aforementioned energy storage system approaches zero. Make it run, The process involves repeatedly executing, in parallel, the following steps: adding the inverse value of the cumulative charge / discharge power amount obtained at the end of each time period to the shortest time period before gate closure to change the planned value, and submitting the changed planned value to the transmission and distribution company managing the power grid by the gate closure time; and, in each time period after the planned value has been finalized, absorbing the fluctuations from the predicted value of the power generation amount of the power generation equipment with the charge / discharge power amount of the energy storage system to bring the actual value of the supplied power amount closer to the changed planned value. Control program.

10. A computer, A process to generate the initial planned values ​​for the amount of electricity supplied to the power grid for each of several time periods, During the time period after the planned values ​​have been determined, a process is performed to control the power supply to the power grid using the power generated by the power generation equipment and the charge / discharge power of the energy storage system so that the actual amount of power supplied to the power grid approaches the planned value, The process involves modifying the planned values ​​for the time period before the planned values ​​are finalized, so that the cumulative charge and discharge power of the aforementioned energy storage system approaches zero. Make it run, The control process includes controlling the power supply to the power grid so that the actual value of the supplied power amount approaches the revised planned value. The power generation by the aforementioned power generation device includes power generation using renewable energy, The process for generating the initial planned value includes generating a predicted value of the amount of electricity generated by the power generation device during the same time period as the time period for the said planned value, as the initial planned value. The control process includes absorbing the fluctuations in the amount of electricity generated by the power generator from the predicted value using the amount of electricity charged and discharged by the energy storage system. Control program.

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