Power management system

Abstract

Provided is a power management system capable of appropriately performing peak clipping. This power management system is provided with: an energy resource group; and a power management device that executes peak clipping control for controlling the energy resource group so that the amount of power supplied from the power system to the facility is clipped. At the start of a predetermined time period, the power management device acquires a predicted amount indicating a predicted time lapse of the amount of power supplied, acquires an actual amount indicating an actual time lapse of the amount of power supplied in the time period, and when a deviation amount between the predicted amount and the actual amount exceeds a predetermined amount, controls the power management device. A re-predicted amount is acquired by re-predicting the time lapse of the amount of power supplied. The power management device executes the peak clipping control when the predicted amount or the re-predicted amount exceeds the first target amount, and does not execute the peak clipping control when the predicted amount or the re-predicted amount does not exceed the first target amount.

Description

Technical Field

[0001] This invention relates to a power management system. Background Technology

[0002] The power management system disclosed in Japanese Patent Application Publication No. 2024-68782 (Patent Document 1) can perform the following "peak shaving": by avoiding the use of power load during periods of high power consumption, the power consumption does not exceed a predetermined target value (see

[0021] ).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2024-68782 Summary of the Invention Generally, maximum electricity demand is used by power companies to calculate electricity charges (basic fees). Therefore, reducing the maximum electricity demand of a user's facilities (residential buildings, factories, etc.) through peak shaving is directly related to reducing the operating costs of those facilities. On the other hand, from the perspective of protecting power adjustment resources (electricity load, batteries, etc.) that can be used for peak shaving and ensuring user convenience, it is preferable to avoid excessive peak shaving.

[0004] This invention was made to solve the above-mentioned problems, and one of the objectives of this invention is to provide a power management system that can properly perform peak shaving.

[0005] A power management system manages the electricity supplied to facilities connected to the power grid. The power management system comprises: an energy resource group, which includes one or more energy resources configured to perform power regulation within the facilities; and a power management device that performs peak-shaving control on the energy resource group to control the power supplied from the power grid to the facilities. At the start of a predetermined time period, the power management device acquires a predicted time shift representing the predicted power supply amount, acquires an actual time shift representing the actual power supply amount during the time period, and acquires a re-predicted amount by re-predicting the time shift of the power supply amount if the deviation between the predicted amount and the actual amount exceeds a predetermined amount. The power management device performs peak-shaving control if the predicted amount or the re-predicted amount exceeds a first target amount; conversely, it does not perform peak-shaving control if the predicted amount or the re-predicted amount does not exceed the first target amount.

[0006] When the actual quantity exceeds the predicted quantity, it may be better to perform peak shaving control. Conversely, when the actual quantity is lower than the predicted quantity, peak shaving control may not be necessary. Therefore, in the above structure, the re-predicted quantity is obtained by re-predicting the time shift of the supplied power. By determining whether to perform peak shaving control based on the re-predicted quantity, unnecessary peak shaving control can be avoided. Therefore, according to the above structure, peak shaving can be performed appropriately.

[0007] Invention Effects According to the present invention, peak clipping can be performed appropriately. Attached Figure Description

[0008] Figure 1 This is a diagram showing the overall structure of the power system in this embodiment.

[0009] Figure 2 This is a time chart used to illustrate the peak-shaving control in this embodiment.

[0010] Figure 3 This is a flowchart illustrating the first processing sequence of peak-shaving control in this embodiment.

[0011] Figure 4 This is a flowchart illustrating the second processing sequence of peak-shaving control in this embodiment. Detailed Implementation

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, identical or corresponding parts in the drawings will be labeled with the same symbols, and their descriptions will not be repeated.

[0013] [Implementation Method] Figure 1 This is a diagram illustrating the overall structure of the power system in this embodiment. Power system 900 includes a power system PG, a server ESP, and facilities 100. The power system PG is a power grid constructed using transmission and distribution equipment. The power system PG may include transformer equipment or be connected to generation equipment. The server ESP is used by an energy service provider (typically a power company).

[0014] In this embodiment, the maximum electrical power (contractual upper limit) that facility 100 can receive from the power system PG is determined through an electricity contract. The maximum electrical power can be represented by the electrical power supplied (kWh) within a predetermined time period (which may be referred to as a unit of time). If the electrical power supplied from the power system PG to facility 100 during the aforementioned time period exceeds the maximum electrical power, a penalty (e.g., a penalty for breach of contract) is imposed on the manager of facility 100. The electricity supplied from the power system PG to facility 100 is measured sequentially by an electricity meter M (e.g., a smart meter) and transmitted to the server ESP and the power management device 5 of facility 100 (described later).

[0015] Facility 100 is a user facility, such as a residence. There is no particular limitation on the type of facility 100; facility 100 can be a building, factory, public facility, etc. Facility 100 (“Power Management System”) includes a distribution panel 1, a power conditioner (PCS) 2, electricity meters 31-33, an energy resource group 4, and a power management device 5.

[0016] Distribution panel 1 is electrically connected to the power system PG. Distribution panel 1 distributes the power supplied from the power system PG to multiple circuits (energy resource group 4 and PCS2) within facility 100.

[0017] PCS2 converts the AC power received from the power distribution panel 1 into DC power according to the instructions from the power management device 5, and outputs the DC power to the energy resource group 4 (vehicle 44 described later).

[0018] Electricity meters 31-33 are electrically connected to the distribution panel 1 and the energy resource group 4. Electricity meters 31-33 respectively detect the electricity consumed by the energy resource group 4 connected to them and output the detected electricity to the power management device 5.

[0019] Energy resource group 4 includes one or more energy resources (one or more resources in facility 100 that can be used for power regulation). In this example, energy resource group 4 includes power load 41, charging equipment (Electric Vehicle Supply Equipment: EVSE) 42, and vehicles 43 and 44. A relay RY1 is connected between the distribution panel 1 and the charging equipment 42. A relay RY2 is connected between PCS2 and vehicle 44.

[0020] Electrical load 41 consumes power supplied from distributor 1. Electrical load 41 may be, for example, air conditioning equipment, lighting equipment, or information equipment. Electrical load 41 may be a battery. Charging device 42 may be an AC charging device (ordinary charger) that outputs alternating current (AC) power, or a DC charging device (fast charger) that outputs direct current (DC) power. Vehicles 43 and 44 each include a battery (not shown) and are charged by power supplied from distributor 1 via charging device 42 or PCS2. Vehicles 43 and 44 may be battery electric vehicles (BEVs) or plug-in hybrid electric vehicles (PHEVs).

[0021] The power management device 5 can be either a power management controller or a power management server. The power management device 5 includes a processor 51 such as a central processing unit (CPU) or a microprocessor (MPU), and a memory 52 such as random access memory (RAM), read-only memory (ROM), and other storage devices. The processor 51 controls the various resources included in the energy resource group 4 based on communication with the server ESP, input signals from various sensors (electricity meters 31-33), and the program stored in the memory 52.

[0022] Peak Cutting Control In this embodiment, the "peak shaving control" of facility 100 can be cited as the main control performed by the power management device 5. The power management device 5 calculates the time shift of the predicted power supply (hereinafter referred to as "predicted amount") from the power system PG to facility 100 based on various information obtainable from the server ESP. Furthermore, the power management device 5 calculates the power consumption of facility 100 by acquiring the power detected by electricity meters 31-33, thereby calculating the time shift of the actual power supply (hereinafter referred to as "actual amount") from the power system PG to facility 100. Then, if the predicted amount exceeds a predetermined target amount, the power management device 5 controls the energy resource group 4 to reduce the actual amount.

[0023] With the execution of peak shaving control, the capacity of the power load 41 (air conditioning capacity of air conditioning equipment, lighting capacity of lighting equipment, etc.) decreases or the charging time of vehicles 43 and 44 increases, which may reduce user convenience. Furthermore, the lifespan of components such as relays RY1 and RY2 may also be shortened. Given this situation, it is preferable to avoid excessive peak shaving. Therefore, certain limitations are imposed on peak shaving control. Specifically, the duration of each peak shaving control cycle can be limited. The number of times peak shaving control is executed can be limited according to a predetermined time period (time periods D1 to D7 described below). The time interval that should be ensured from the end of one peak shaving control cycle to the start of the next peak shaving control cycle can also be determined.

[0024] Figure 2 This is a time chart used to illustrate the peak shaving control in this embodiment. The horizontal axis represents elapsed time. The upper vertical axis represents the power supplied from the power system PG to facility 100 for each specified time period (cumulative value of the supplied power). The lower vertical axis represents the peak shaving control performed (ON) / not performed (OFF) by the power management device 5. The predicted amount is represented by a dashed line, and the actual amount is represented by a solid line.

[0025] The power management device 5 determines whether to implement peak shaving control based on a predetermined time period (e.g., 30 minutes). Figure 2 The diagram shows seven time periods, D1 to D7.

[0026] In this embodiment, two target electrical quantities (hereinafter referred to as "target quantities") are determined for the electrical power supplied from the power system PG to facility 100 for each specified time period. The second target quantity TAG2 is lower than the maximum electrical power (contractual upper limit) supplied to facility 100 from the power system PG. The first target quantity TAG1 is lower than the second target quantity TAG2.

[0027] At the beginning of each time period, the power management device 5 calculates the overall predicted value for that time period. In this example, for simplicity, the predicted value is represented by a straight line. However, the predicted value can vary in any way, such as a curve or a step. Furthermore, the "beginning" of a time period is not limited to the exact start time of the time period; it can include a certain period of time (e.g., a few minutes) after the start time.

[0028] <<Time Period D1>> The predicted quantity at the end of time period D1 does not exceed the first target quantity TAG1. In this case, the power management device 5 generally does not perform peak shaving control. In addition, an error may occur between the predicted quantity and the actual quantity (the deviation ΔW described later). In this example, even without peak shaving control, the actual quantity does not exceed the first target quantity TAG1 at the end of time period D1 and remains lower than the predicted quantity.

[0029] <<Time Period D2>> The predicted amount at the end of time period D2 exceeds the second target amount TAG2. In this case, in this embodiment, the power management device 5 shall, in principle, immediately perform peak shaving control (reference times t1 to t2). Thus, the actual amount during the execution of peak shaving control decreases, thereby reducing the actual amount at the end of time period D2. In this example, the actual amount at the end of time period D2 is greater than the first target amount TAG1 but less than the second target amount TAG2.

[0030] In this case, the actual amount at the end of time period D2 can be less than the first target amount TAG1 or greater than the second target amount TAG2. Even if peak shaving control is performed, if the actual amount at the end of time period D2 is greater than the second target amount TAG2, it is meaningful to perform peak shaving control in terms of lowering the peak value compared to not performing peak shaving control.

[0031] <<Time Period D3>> The predicted quantity at the end of time period D3 is greater than or equal to the first target quantity TAG1 and less than the second target quantity TAG2. In this case, in this embodiment, the power management device 5 waits until the second half of time period D3 is divided into the first and second halves (in this example, 15 minutes), and then performs peak shaving control (reference times t3 to t4). Through the execution of peak shaving control, the actual quantity decreases, and the actual quantity at the end of time period D2 decreases. In this example, the actual quantity at the end of time period D3 is less than the first target quantity TAG1. However, the actual quantity at the end of time period D3 can be greater than or equal to the first target quantity TAG1.

[0032] Another example is delaying the execution timing of peak shaving control to the latter half of the time period. The execution timing of peak shaving control only needs to be delayed to a predetermined base time. In the case of a time period of 30 minutes, the base time is not limited to 15 minutes after the start of the time period (in the example of time period D3). For example, it can be 10 minutes after the start of the time period or 20 minutes after the start of the time period.

[0033] <<Time Period D4>> Similar to time period D3, the predicted quantity at the end of time period D4 is greater than the first target quantity TAG1 and less than the second target quantity TAG2. As explained in time period D3, power management device 5 does not perform peak shaving control and waits until the latter half of time period D4. During time period D4, the actual quantity is lower than in time period D3, and at time t5, the deviation ΔW (absolute value) between the predicted quantity Wp and the actual quantity Wa exceeds the specified amount (in this example, Wp > Wa, ΔW = |Wp - Wa|). Thus, at time t5, power management device 5 again predicts the power supply from power system PG to facility 100. The re-predicted power supply (predicted quantity) is simply referred to as the "re-predicted quantity" and is represented by a double-dotted line in the figure. In this example, the re-predicted quantity at the end of time period D4 is less than the first target quantity TAG1. Therefore, power management device 5 does not perform peak shaving control.

[0034] If the predicted value at the beginning of a time period is above the first target value (TAG1) but less than the second target value (TAG2), peak clipping control can be considered immediately. However, this could lead to excessive peak clipping control if the actual value is lower than the predicted value and the time period shifts as it is, such as time period D4. Excessive peak clipping control can be prevented by delaying the timing of peak clipping control execution as much as possible (in this example, delaying it to the beginning of the second half).

[0035] <<Time Period D5>> The predicted quantity at the end of time period D5 is less than the first target quantity TAG1. However, unlike time period D4, in time period D5, the actual quantity increases sharply compared to the predicted quantity. At time t6, the deviation ΔW between the predicted quantity Wp and the actual quantity Wa exceeds the specified amount (in this example, Wa > Wp). Thus, at time t6, the power management device 5 calculates the re-predicted quantity. In this example, the re-predicted quantity at the end of time period D5 exceeds the second target quantity TAG2. Therefore, the power management device 5 immediately performs peak shaving control at time t6 (reference times t6-t7). In this example, the actual quantity at the end of time period D5 decreases to above the first target quantity TAG1 and below the second target quantity TAG2.

[0036] In contrast to time period D4, sometimes the actual quantity increases sharply compared to the predicted quantity. Therefore, when the deviation exceeds the specified amount, the peak shaving control that is actually needed can be implemented by calculating the re-predicted quantity.

[0037] <<Time Period D6>> Similar to time period D5, the predicted amount at the end of time period D6 is less than the first target amount TAG1. The actual amount increases sharply compared to the predicted amount, and at time t8, the deviation ΔW between the predicted amount Wp and the actual amount Wa exceeds the specified amount (in this example, Wa > Wp). At time t8, the power management device 5 calculates the re-predicted amount. The re-predicted amount at the end of time period D6 is greater than the first target amount TAG1 and less than the second target amount TAG2. In this case, the power management device 5 waits until the latter half of time period D6 and then performs peak shaving control (reference times t9 to t10). In this example, the actual amount at the end of time period D6 decreases to less than the first target amount TAG1.

[0038] When determining whether to perform peak-shaving control based on the repredicted amount, the timing of peak-shaving control execution is delayed as much as possible, similar to time period D3 (in this example, delayed until the beginning of the second half). This prevents excessive peak-shaving control. Although not illustrated, if the repredicted amount at the end of the time period is less than the first target amount TAG1, the power management device 5 does not perform peak-shaving control. This, of course, also prevents excessive peak-shaving control.

[0039] <<Time Period D7>> In time periods D3 and D6, it was explained that peak shaving control was delayed to the latter half of the time period. However, this is an example of delaying the execution timing of peak shaving control to a predetermined time. Instead, the power management device 5 can also determine the execution timing of peak shaving control based on the predicted (or re-predicted) amount. Specifically, assume that the predicted amount calculated at the beginning of time period D7 and at the end of time period D7 is greater than the first target amount TAG1 and less than the second target amount TAG2 (reference predicted amount L1). Then, the power management device 5 shifts the predicted amount L1 in parallel so that at the end of time period D7, the predicted amount L1 exactly reaches the first target amount TAG1 (reference predicted amount L2). When the actual amount intersects with the predicted amount L2 (when the actual amount is equal to the predicted amount L2), the power management device 5 performs peak shaving control (reference times t11 to t12). The power management device 5 can variably determine the execution timing of peak shaving control using this method.

[0040] <Processing Flow> Figure 3 This is a flowchart illustrating the first processing sequence of peak-shaving control in this embodiment. Figure 4 This is a flowchart illustrating the second processing sequence of peak-shaving control in this embodiment. The processes shown in these flowcharts are invoked and executed by the main program (not shown) when predetermined conditions are met (e.g., each specified cycle). Each step is implemented through software processing based on the power management device 5 (processor 51), but can also be implemented through hardware (circuit) configured within the power management device 5. Hereinafter, the steps will be abbreviated as S.

[0041] refer to Figure 3 In S11, the power management device 5 determines whether a new time period has begun. If it is not the start time of a new time period ("No" in S11), the power management device 5 returns the process to the main program. When the start time of the time period arrives ("Yes" in S11), the power management device 5 causes the process to proceed to S12.

[0042] In S12, the power management device 5 calculates the predicted power supply (predicted amount) from the power system PG to the facility 100. The predicted amount in S12 can be considered the initial predicted amount. The power management device 5 can obtain historical records of the power supply from the power system PG to the facility 100 (e.g., the power supply during the same period last year) and meteorological information (e.g., weather, temperature, humidity, wind speed) for that time period from the server ESP. The power management device 5 can maintain historical records related to the use of power loads 41 such as air conditioning equipment, lighting equipment, and information equipment in the memory 52, and can also maintain or predict information related to the prediction of the use of power loads 41 in the memory 52. ​​The power management device 5 can maintain or obtain information related to the charging prediction of vehicles 43 and 44 (so-called charging plans) in the memory 52. ​​The power management device 5 can calculate the predicted amount for, for example, 30 minutes from the beginning to the end of a time period, using a known method based on some or all of the above information. The power management device 5 stores the calculated predicted amount in the memory 52.

[0043] In S13, the power management device 5 calculates the actual power supply (actual amount) from the power system PG to the facility 100. Specifically, the power management device 5 can calculate the actual amount by accumulating the power detected by electricity meters 31-33 after the start of the time period. The power management device 5 can obtain the power detected by electricity meter M after the start of the time period from the server ESP.

[0044] In S14, the power management device 5 calculates the deviation (absolute value) between the predicted quantity and the actual quantity by calculating the difference between the predicted quantity calculated in S12 and the actual quantity calculated in S13 for the same time.

[0045] In S15, the power management device 5 determines whether the deviation calculated in S14 is greater than a predetermined amount. The predetermined amount is determined in advance as the magnitude to which the error between the actual amount and the predicted amount cannot be ignored and the predicted amount is updated. The predetermined amount can be a fixed value. Alternatively, the predetermined amount can be, for example, a variable value that can change with time. As an example, the predetermined amount can be increased as time passes from the beginning of the time period.

[0046] If the deviation is greater than a predetermined amount ("Yes" in S15), the power management device 5 proceeds to S16, where a re-predicted amount is obtained by recalculating the predicted amount. The power management device 5 stores the re-predicted amount in the memory 52. ​​Then, the power management device 5 proceeds to S17. On the other hand, if the deviation is less than a predetermined amount ("Yes" in S15), the power management device 5 skips the processing in S16 and proceeds to S17.

[0047] In S17, the power management device 5 determines whether the time period has ended. If it is in the middle of the time period ("No" in S17), the power management device 5 returns to S13. Then, the processing in S13 to S16 (calculation of actual and re-predicted quantities) is executed again. When the end time of the time period arrives ("Yes" in S17), the power management device 5 returns to the main program and terminates.

[0048] Thus, in this embodiment, if the deviation between the predicted and actual quantities is greater than a predetermined amount, the actual quantity may exceed the predicted quantity, potentially requiring peak shaving control; conversely, if the actual quantity is lower than the predicted quantity, peak shaving control may not be necessary. Therefore, the power management device 5 calculates the re-predicted quantity by re-predicting the time shift of the power supply from the power system PG to the facility 100. By re-determining whether to perform peak shaving control based on the re-predicted quantity, the necessary peak shaving control can be performed, or unnecessary peak shaving control can be avoided. As a result, the reduction in user convenience can be suppressed, while the protection of the energy resource group 4 is achieved. Therefore, according to this embodiment, peak shaving of the facility 100 can be appropriately performed.

[0049] Next, refer to Figure 4 The process shown in the flowchart is related to Figure 3 The processes shown in the flowchart are executed in parallel. In S21, the power management device 5 determines whether peak shaving control should be prohibited. If the number of times peak shaving control has been executed within a time period has reached the predetermined number, or if the predetermined time interval has not been guaranteed since the last execution of peak shaving control, the power management device 5 determines that peak shaving control should be prohibited ("Yes" in S21), and does not execute subsequent processes, but returns the process to the main program. If peak shaving control is not prohibited ("No" in S21), the power management device 5 causes the process to proceed to S22.

[0050] In S22, the power management device 5 reads the data from the memory 52. Figure 3 The predicted amount (initial predicted amount) calculated in the S12 process or the re-predicted amount calculated in the S16 process.

[0051] In S23, the power management device 5 determines whether the predicted or re-predicted amount exceeds the second target amount TAG2 at the end of the time period. If the predicted or re-predicted amount exceeds the second target amount TAG2 ("yes" in S23), the power management device 5 controls the energy resource group 4 to perform peak shaving control at the second timing (S24). Then, the power management device 5 returns the processing to the main program.

[0052] If the predicted or re-predicted amount does not exceed the second target amount TAG2 at the end of the time period ("No" in S23), the power management device 5 determines whether the predicted or re-predicted amount exceeds the first target amount TAG1 at the end of the time period (S25). If the predicted amount exceeds the first target amount TAG1 ("Yes" in S25), the power management device 5 controls the energy resource group 4 to perform peak shaving control at the first timing (S26). Then, the power management device 5 returns the processing to the main program.

[0053] If the predicted or re-predicted amount does not exceed the first target amount TAG1 at the end of the time period ("No" in S25), the power management device 5 determines that peak shaving control will not be performed at least at that moment (S27). Then, the power management device 5 returns the processing to the main program.

[0054] Thus, in this embodiment, the execution timing (first timing) for the case where the predicted amount exceeds the first target amount but exceeds the second target amount is later than the execution timing (second timing) for the peak-shaving control when the predicted amount exceeds the second target amount TAG2. The second timing can be, for example, after it is determined that the predicted amount exceeds the second target amount TAG2 (see reference). Figure 2 The time periods D2 and D5). The second timer is not limited to these; for example, it can be the first half of the time period. Conversely, the first timer can be the second half of the time period (see reference). Figure 2 The time period is D3, D6). The first timing is not limited to a predetermined fixed timing, but can also be variably determined based on the predicted quantity (see reference). Figure 2 The time period is D7.

[0055] The predicted amount (or re-predicted amount) is not necessarily accurate. Even if the predicted amount at the end of the time period exceeds the first target value TAG1, there are cases where the actual amount is lower than the predicted amount and the actual amount at the end of the time period does not exceed the first target value TAG1. Therefore, simply put, even if the predicted amount exceeds the first target value TAG1, the execution timing of peak shaving control is delayed as much as possible by not performing peak shaving control, thereby avoiding unnecessary peak shaving control. Therefore, the reduction in user convenience can be suppressed more reliably, while protecting energy resource group 4. Therefore, according to this embodiment, peak shaving of facility 100 can be further appropriately performed.

[0056] In Figure 1When the charging equipment 42 and vehicles 43 and 44 in the energy resource group 4 shown are used for peak shaving control, usage restrictions related to the number of uses or usage time periods are set for the charging equipment 42 and vehicles 43 and 44 due to the opening and closing of relays RY1 and RY2. Hereinafter, the charging equipment 42 and vehicles 43 and 44 (which may include relays RY1 and RY2) will be referred to as "first resource". On the other hand, the power load 41 may include resources with relaxed (or no) usage restrictions. Such resources will be referred to as "second resource". Under this condition, when the predicted or re-predicted amount exceeds the first target amount TAG1, the power management device 5 can make the execution timing of peak shaving control using the first resource later than the execution timing of peak shaving control using the second resource. As a result, the lifespan of the first resource (especially relays RY1 and RY2) can be extended.

[0057] Without the aforementioned restrictions on the use of the second resource, the power management device 5 can use the second resource when the predicted or re-predicted amount exceeds the first target amount TAG1. On the other hand, it can perform peak shaving control without using the first resource (i.e., using only the second resource). As a result, the lifespan of the first resource (especially relays RY1 and RY2) can be extended more reliably.

[0058] The embodiments disclosed herein are considered illustrative in all respects and not restrictive. The scope of the invention is defined not by the description of the above embodiments but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0059] Symbol Explanation 100-Facility, 1-Distribution panel, 2-PCS, 31-33-Electricity meter, 4-Energy resource group, 41-Electric load, 42-Charging equipment, 43, 44-Vehicle, 5-Electric power management device, 51-Processor, 52-Memory, ESP-Server, M-Electricity meter, PG-Power system, RY1, RY2-Relays, 900-Power system.

Claims

1. A power management system for managing the power of facilities connected to the power grid, the power management system being characterized by comprising: An energy resource group, comprising one or more energy resources configured to be electrically adjustable in the facility; and A power management device that performs peak-shaving control on the energy resource group in a manner that controls the peak-shaving of the power supplied from the power system to the facility. The power management device performs the following processing: At the start of a predetermined time period, a predicted amount representing the predicted time shift of the supplied power is obtained. Obtain the actual amount representing the actual time shift of the supplied power during the time period. If the deviation between the predicted amount and the actual amount exceeds a predetermined amount, obtain a re-predicted amount by re-predicting the time shift of the supplied power. The peak-shaving control is performed if the predicted amount or the re-predicted amount exceeds the first target amount. On the other hand... Peak clipping control is not performed if the predicted amount or the re-predicted amount does not exceed the first target amount.

2. The power management system according to claim 1, characterized in that, The timing of the peak shaving control is later than the timing of the peak shaving control when the predicted amount or the re-predicted amount exceeds the first target amount but does not exceed a second target amount higher than the first target amount.

3. The power management system according to claim 2, characterized in that, The power management device performs the following processing: If the repredicted amount exceeds the first target amount but does not exceed the second target amount, the peak-shaving control is performed before the reference time within the time period. On the other hand... If the repredicted amount exceeds the second target amount, the peak clipping control is performed after the reference time has elapsed.

4. The power management system according to claim 2 or 3, characterized in that, The energy resource group includes: Resource 1 has usage restrictions related to the number of times or the time period during which it is used for power regulation; and The second resource has more lenient usage restrictions compared to the first resource. If the reprediction amount exceeds the first target amount, the power management device will schedule the execution timing of the peak shaving control using the first resource later than the execution timing of the peak shaving control using the second resource.

5. The power management system according to claim 4, characterized in that, The second resource is an energy resource without the aforementioned usage restrictions. The power management device uses the second resource when the reprediction amount exceeds the first target amount, and performs peak shaving control without using the first resource.

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