Power management system

Abstract

To provide a power management system that can properly implement peak shaving. [Solution] The power management system comprises an energy resource group 4 and a power management device 5 that performs peak-cut control to control the energy resource group 4 so as to peak-cut the amount of power supplied from the power grid PG to the facility 100. At the start of a predetermined period, the power management device 5 obtains a predicted amount showing the expected time progression of the amount of power supplied, and obtains an actual amount showing the actual time progression of the amount of power supplied during the period. If the discrepancy between the predicted amount and the actual amount exceeds a specified amount, it obtains a re-predicted amount by predicting the time progression of the amount of power supplied again. The power management device 5 performs peak-cut control if the predicted amount or the re-predicted amount exceeds a first target amount, while not performing peak-cut control if the predicted amount or the re-predicted amount does not exceed the first target amount.

Description

Technical Field

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[0001] The present disclosure relates to a power management system.

Background Art

[0002] The power management system disclosed in Japanese Patent Application Laid-Open No. 2024-68782 (Patent Document 1) can execute "peak cut" so that the amount of power used does not exceed a predetermined target value by avoiding the time zone with a large amount of power used and using the power load (see

[0021] ).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, the maximum demand power is used for calculating the electricity charge (basic charge) by the power company. Therefore, reducing the maximum demand power of the facilities (houses, buildings, factories, etc.) of consumers directly leads to reducing the running cost of the facilities. On the other hand, from the viewpoints of protecting the power adjustment resources (electric loads, storage batteries, etc.) available for peak cut and ensuring the convenience of users, it is desirable to avoid excessive peak cut.

[0005] The present disclosure has been made to solve the above problems, and one of the objects of the present disclosure is to provide a power management system capable of appropriately executing peak cut.

Means for Solving the Problems

[0006] The power management system manages the power of facilities connected to the power grid. The power management system comprises a group of energy resources, each of which is configured to allow power adjustment within the facility, and a power management device that performs peak-cut control, controlling the group of energy resources to cut the peak amount of power supplied from the power grid to the facility. At the start of a predetermined period, the power management device obtains a predicted amount showing the expected time progression of the amount of power supplied, and obtains an actual amount showing the actual time progression of the amount of power supplied during the period. If the deviation between the predicted amount and the actual amount exceeds a specified amount, it obtains a re-predicted amount by predicting the time progression of the amount of power supplied again. The power management device performs peak-cut control if the predicted amount or the re-predicted amount exceeds a first target amount, but does not perform peak-cut control if the predicted amount or the re-predicted amount does not exceed the first target amount.

[0007] If the actual amount exceeds the predicted amount, it may be advisable to implement peak-cutting control. Conversely, if the actual amount falls below the predicted amount, it may not be necessary to implement peak-cutting control. Therefore, in the above configuration, a new predicted amount is obtained by predicting the time trend of the supplied power amount again. By deciding whether or not to implement peak-cutting control based on the new predicted amount, unnecessary peak-cutting control can be avoided. Thus, with the above configuration, peak-cutting can be implemented appropriately. [Effects of the Invention]

[0008] According to this disclosure, peak shaving can be performed appropriately. [Brief explanation of the drawing]

[0009] [Figure 1] This diagram shows the overall configuration of the power system in this embodiment. [Figure 2] This is a time chart illustrating the peak cut control in this embodiment. [Figure 3] This flowchart shows the first processing procedure for peak cut control in this embodiment. [Figure 4] This flowchart shows the second processing procedure for peak cut control in this embodiment. [Modes for carrying out the invention]

[0010] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated.

[0011] [Embodiment] Figure 1 shows the overall configuration of the power system in this embodiment. The power system 900 includes a power grid PG, a server ESP, and a facility 100. The power grid PG is a power grid constructed by transmission and distribution equipment. The power grid PG may include substations or be connected to power generation equipment. The server ESP is operated by an energy service provider (typically a power company).

[0012] In this embodiment, the maximum amount of electricity (contract limit) that facility 100 can receive from the power grid PG is determined by the power contract. The maximum amount of electricity can be expressed as the amount of electricity supplied (kWh) per predetermined period (which may also be called a unit time). If the amount of electricity supplied from the power grid PG to facility 100 per period exceeds the maximum amount of electricity, a penalty (e.g., a penalty fee) is imposed on the manager of facility 100. The amount of electricity supplied from the power grid 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 (described later) of facility 100.

[0013] Facility 100 is a consumer facility, such as a residence. The type of facility 100 is not particularly limited, and facility 100 may be a building, factory, public facility, etc. Facility 100 ("power management system") includes a distribution board 1, a power conditioner (PCS: Power Conditioning System) 2, electricity meters 31-33, an energy resource group 4, and a power management device 5.

[0014] Distribution board 1 is electrically connected to the power grid PG. Distribution board 1 distributes the power supplied from the power grid PG to multiple circuits (energy resource group 4 and PCS2) within facility 100.

[0015] PCS2, following instructions from the power management device 5, converts the AC power received from the distribution board 1 into DC power and outputs that DC power to the energy resource group 4 (vehicle 44, described later).

[0016] The electricity meters 31-33 are electrically connected between the distribution board 1 and the energy resource group 4. Each of the electricity meters 31-33 sequentially detects the amount of electricity consumed by the energy resource group 4 connected to it and outputs the detected amount of electricity to the power management device 5.

[0017] Energy resource group 4 includes one or more energy resources (one or more resources usable for power adjustment in facility 100). In this example, energy resource group 4 includes a power load 41, electric vehicle supply equipment (EVSE) 42, and vehicles 43 and 44. Relay RY1 is connected between the distribution board 1 and the electric vehicle supply equipment 42. Relay RY2 is connected between the PCS2 and vehicle 44.

[0018] The power load 41 consumes power supplied from the distribution board 1. The power load 41 is, for example, an air conditioner, lighting equipment, or information equipment. The power load 41 may also be a storage battery. The charging equipment 42 may be an AC charging equipment (normal charger) that outputs alternating current power, or a DC charging equipment (fast charger) that outputs direct current power. Each of the vehicles 43 and 44 includes a storage battery (not shown) and is charged by power supplied from the distribution board 1 via the charging equipment 42 or PCS2. The vehicles 43 and 44 may be electric vehicles (BEV: Battery Electric Vehicle) or plug-in hybrid electric vehicles (PHEV: Plug-in Hybrid Electric Vehicle).

[0019] The power management device 5 may be a power management controller or a power management server. The power management device 5 includes a processor 51 such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit), and a memory 52 such as a RAM (Random Access Memory), a ROM (Read Only Memory), and a storage. Based on communication with the server ESP, input of signals from each sensor (electricity meters 31 to 33), and a program stored in the memory 52, the processor 51 controls each resource included in the energy resource group 4.

[0020] <Peak cut control> As a main control executed by the power management device 5 in the present embodiment, "peak cut control" of the facility 100 is mentioned. Based on various information that can be obtained from the server ESP, etc., the power management device 5 calculates the time transition of the predicted power supply amount (hereinafter abbreviated as "predicted amount") from the power grid PG to the facility 100. Further, the power management device 5 calculates the power consumption amount of the facility 100 by obtaining the power amounts detected by the electricity meters 31 to 33, and thereby calculates the time transition of the actual power supply amount (hereinafter abbreviated as "actual amount") from the power grid PG to the facility 100. Then, when the predicted amount exceeds a predetermined target amount, the power management device 5 controls the energy resource group 4 so that the actual amount is reduced.

[0021] With the execution of peak cut control, the capabilities of the power load 41 (such as the air conditioning capacity of air conditioning equipment and the lighting capacity of lighting equipment) may decrease, or the charging times of the vehicles 43, 44 may become longer, thereby reducing the convenience for the user. Also, the service life of components such as the relays RY1, RY2, etc. may be shortened. Due to such circumstances, it is desirable to avoid excessive peak cut. Therefore, certain restrictions are imposed on the peak cut control. Specifically, the duration of one execution of peak cut control may be restricted. The number of executions of peak cut control may be restricted at predetermined intervals (periods D1 to D7 described later). A time interval to be ensured from the end of a certain peak cut control to the start of the next peak cut control may be defined.

[0022] Figure 2 is a time chart for explaining the peak cut control in the present embodiment. The horizontal axis represents the elapsed time. The upper vertical axis represents the power supply amount per predetermined period (the integrated value of the supply power) from the power grid PG to the facility 100. The lower vertical axis represents the execution (ON) / non-execution (OFF) of the peak cut control by the power management device 5. The predicted amount is indicated by a dashed line, and the actual amount is indicated by a solid line.

[0023] The power management device 5 determines the necessity of executing the peak cut control at predetermined intervals (for example, every 30 minutes). Seven periods D1 to D7 are shown in Figure 2.

[0024] In the present embodiment, two target power amounts (hereinafter abbreviated as "target amounts") are defined for the power supply amount per predetermined period from the power grid PG to the facility 100. The second target amount TAG2 is lower than the maximum power supply amount (contract upper limit value) that the facility 100 can receive from the power grid PG. The first target amount TAG1 is even lower than the second target amount TAG2.

[0025] The power management device 5 calculates a predicted quantity for the entire period at the start of each period. In this example, for simplicity, the predicted quantity is shown as a straight line. However, the predicted quantity may change in any manner, for example, curvilinearly or in steps. Note that the "start time" of a period is not limited to the start time of the period, but may include a certain period after the start time (for example, a few minutes).

[0026] ≪Period D1≫ The predicted quantity at the end of period D1 will not exceed the first target quantity TAG1. In this case, the power management device 5 will not perform peak cut control as a general rule. Note that an error (deviation ΔW, described later) may occur between the predicted quantity and the actual quantity. In this example, even without performing peak cut control, the actual quantity will not exceed the first target quantity TAG1 at the end of period D1 and will always remain below the predicted quantity.

[0027] ≪Period D2≫ The predicted amount at the end of period D2 exceeds the second target amount TAG2. In this case, in this embodiment, the power management device 5 immediately performs peak cut control (see times t1 to t2). As a result, the actual amount during the execution of peak cut control is reduced, and the actual amount at the end of period D2 is reduced. In this example, the actual amount at the end of period D2 is greater than or equal to the first target amount TAG1 and less than the second target amount TAG2.

[0028] However, the actual amount at the end of period D2 may be less than the first target amount TAG1, or it may be greater than or equal to the second target amount TAG2. Even if the actual amount at the end of period D2 is greater than or equal to the second target amount TAG2 despite the implementation of peak cut control, the implementation of peak cut control is still meaningful because the peak will be lower compared to when peak cut control is not implemented.

[0029] ≪Period D3≫ The predicted amount at the end of period D3 is greater than or equal to the first target amount TAG1 and less than the second target amount TAG2. In this embodiment, the power management device 5 waits until the second half of period D3 is reached (only 15 minutes in this example) before executing peak cut control (see times t3 to t4). The actual amount is reduced by the execution of peak cut control, and the actual amount at the end of period D2 is reduced. In this example, the actual amount at the end of period D3 becomes less than the first target amount TAG1. However, the actual amount at the end of period D3 may remain greater than or equal to the first target amount TAG1.

[0030] Note that delaying the execution of peak cut control until the latter half of the period is just one example. The execution of peak cut control can be delayed until a predetermined reference time. If the length of the period is 30 minutes, the reference time is not limited to 15 minutes after the start of the period (example for period D3), but could be, for example, 10 minutes after the start of the period or 20 minutes after the start of the period.

[0031] ≪Period D4≫ Similar to period D3, the predicted amount at the end of period D4 is greater than or equal to the first target amount TAG1 and less than the second target amount TAG2. As explained in period D3, the power management device 5 waits until the latter half of period D4 without performing peak cut control. In period D4, the actual amount remains lower than in period D3, and at time t5, the deviation amount ΔW (absolute value) between the predicted amount Wp and the actual amount Wa exceeds the specified amount (in this example, Wp > Wa, so ΔW = |Wp - Wa|). Then, at time t5, the power management device 5 predicts the amount of power supplied from the power system PG to facility 100 again. The newly predicted amount of power supplied (predicted amount) will be abbreviated as "re-predicted amount" below and is shown by a dashed line in the figure. In this example, the re-predicted amount at the end of period D4 is less than the first target amount TAG1. Therefore, the power management device 5 does not perform peak cut control.

[0032] It is conceivable to immediately implement peak cutting control if the predicted quantity at the start of the period is greater than or equal to the first target quantity TAG1 and less than the second target quantity TAG2. However, this could lead to excessive peak cutting control if the actual quantity remains lower than the predicted quantity, as in period D4. Excessive peak cutting control can be prevented by delaying the timing of peak cutting control as much as possible (in this example, delaying it until the start of the second half).

[0033] ≪Period D5≫ At the end of period D5, the predicted quantity is less than the first target quantity TAG1. However, unlike period D4, in period D5 the actual quantity increases more sharply than the predicted quantity, and at time t6, the deviation ΔW between the predicted quantity Wp and the actual quantity Wa exceeds a specified amount (in this example, Wa > Wp). Consequently, at time t6, the power management device 5 calculates a new predicted quantity. In this example, the new predicted quantity at the end of period D5 exceeds the second target quantity TAG2. Therefore, at time t6, the power management device 5 immediately performs peak cut control (see times t6-t7). In this example, the actual quantity at the end of period D5 is reduced to be greater than or equal to the first target quantity TAG1 and less than the second target quantity TAG2.

[0034] Unlike period D4, actual quantities may increase more sharply than predicted quantities. Therefore, if the deviation exceeds a specified amount, it becomes possible to perform necessary peak-cutting control by recalculating the predicted quantity.

[0035] ≪Period D6≫ Similar to period D5, the predicted quantity at the end of period D6 is less than the first target quantity TAG1. The actual quantity increases more steeply than the predicted quantity, and at time t8, the deviation ΔW between the predicted quantity Wp and the actual quantity Wa exceeds a specified amount (in this example, Wa > Wp). At time t8, the power management device 5 calculates a new predicted quantity. The new predicted quantity at the end of period D6 is greater than or equal to the first target quantity TAG1 and less than the second target quantity TAG2. In this case, the power management device 5 waits until the latter half of period D6 to perform peak cut control (see times t9~t10). In this example, the actual quantity at the end of period D6 is reduced to less than the first target quantity TAG1.

[0036] When determining whether or not to perform peak-cutting control based on the re-predicted amount, the timing of the peak-cutting control is delayed as much as possible, similar to period D3 (in this example, delayed until the start of the second half). This prevents excessive peak-cutting control. Although not shown in the diagram, if the re-predicted amount at the end of the period is less than the first target amount TAG1, the power management device 5 does not perform peak-cutting control. This also, of course, prevents excessive peak-cutting control.

[0037] ≪Period D7≫ In periods D3 and D6, it was explained that peak cut control is delayed to the latter half of the period. However, this is an example of delaying the execution timing of peak cut control until a predetermined time. Alternatively, the power management device 5 may determine the execution timing of peak cut control based on the predicted amount (or re-predicted amount). Specifically, it is assumed that the predicted amount at the end of period D7, calculated at the start of period D7, is greater than or equal to the first target amount TAG1 and less than the second target amount TAG2 (see predicted amount L1). Then, the power management device 5 shifts the predicted amount L1 so that it reaches the first target amount TAG1 exactly at the end of period D7 (see predicted amount L2). The power management device 5 executes peak cut control when the actual amount and the predicted amount L2 intersect (when the actual amount and the predicted amount L2 become equal) (see times t11~t12). The power management device 5 may variably determine the execution timing of peak cut control according to this method.

[0038] <Processing Flow> Figure 3 is a flowchart showing the first processing procedure for peak cut control in this embodiment. Figure 4 is a flowchart showing the second processing procedure for peak cut control in this embodiment. The processes shown in these flowcharts are called and executed from a main routine (not shown) when predetermined conditions are met (for example, at predetermined intervals). Each step is implemented by software processing by the power management device 5 (processor 51), but may also be implemented by hardware (electrical circuits) located within the power management device 5. Hereinafter, steps will be abbreviated as S.

[0039] Referring to Figure 3, in S11, the power management device 5 determines whether a new period has started. If it is not the start time of a new period (NO in S11), the power management device 5 returns the process to the main routine. When the start time of the period arrives (YES in S11), the power management device 5 proceeds the process to S12.

[0040] In S12, the power management device 5 calculates the predicted amount of power supplied from the power grid PG to the facility 100 (predicted amount). The predicted amount in S12 is, so to speak, the initial predicted amount. The power management device 5 may obtain from the server ESP the history of the amount of power supplied from the power grid PG to the facility 100 (for example, the amount of power supplied at the same time last year), weather information for the period (for example, weather, temperature, humidity, wind speed), etc. The power management device 5 may also store in memory 52 the history of the use of power loads 41 such as air conditioning equipment, lighting equipment, and information equipment, and may store or predict information regarding the predicted use of power loads 41 in memory 52. ​​The power management device 5 may also store or obtain in memory 52 information regarding the predicted charging of vehicles 43 and 44 (so-called charging schedule). The power management device 5 can calculate a predicted amount for, for example, 30 minutes from the start to the end of the period, according to a known method based on some or all of the above information. The power management device 5 stores the calculated predicted amount in memory 52.

[0041] In S13, the power management device 5 calculates the actual amount of electricity supplied (actual amount) from the power grid PG to facility 100. Specifically, the power management device 5 can calculate the actual amount by accumulating the amounts of electricity detected by electricity meters 31 to 33 after the start of the period. The power management device 5 may also obtain the amount of electricity detected by electricity meter M after the start of the period from the server ESP.

[0042] In S14, the power management device 5 calculates the difference (absolute value) between the predicted amount and the actual amount by determining the difference between the predicted amount calculated in S12 and the actual amount calculated in S13 for the same time period.

[0043] In S15, the power management device 5 determines whether the deviation calculated in S14 is greater than a specified amount. The specified amount is predetermined to be large enough that the error between the predicted amount and the actual amount cannot be ignored, and it is advisable to update the predicted amount. The specified amount may be a fixed value. Alternatively, the specified amount may be a variable value that can change over time, for example. As an example, the specified amount may be increased as time elapses from the start of the period.

[0044] If the deviation is greater than the specified amount (YES in S15), the power management device 5 proceeds to S16 and obtains a re-predicted amount by recalculating the predicted amount. The power management device 5 stores the re-predicted amount in memory 52. ​​After that, the power management device 5 proceeds to S17. On the other hand, if the deviation is less than or equal to the specified amount (YES in S15), the power management device 5 skips the process in S16 and proceeds to S17.

[0045] In S17, the power management device 5 determines whether the period has ended. If the period is still ongoing (NO in S17), the power management device 5 returns the process to S13. As a result, the processes in S13 to S16 (calculation of actual and re-predicted amounts) are executed again. When the end time of the period arrives (YES in S17), the power management device 5 returns the process to the main routine and terminates.

[0046] Thus, in this embodiment, if the discrepancy between the predicted amount and the actual amount is greater than a specified amount, it may be better to actually perform peak cut control if the actual amount is exceeding the predicted amount, or it may be better to actually perform peak cut control if the actual amount is falling below the predicted amount. Therefore, the power management device 5 calculates a re-predicted amount by re-predicting the time trend of the amount of power supplied from the power grid PG to facility 100. By re-determining whether or not to perform peak cut control based on the re-predicted amount, it is possible to perform necessary peak cut control or avoid performing unnecessary peak cut control. As a result, it is possible to protect the energy resource group 4 while suppressing a decrease in user convenience. Thus, according to this embodiment, peak cut of facility 100 can be performed appropriately.

[0047] Referring to Figure 4, the processes shown in this flowchart are executed in parallel with the processes shown in the flowchart explained in Figure 3. In S21, the power management device 5 determines whether peak cut control is prohibited. If the number of times peak cut control has been executed during the period has already reached the specified number, or if the specified time interval has not been secured since the last execution of peak cut control, the power management device 5 determines that peak cut control is prohibited (YES in S21) and returns the process to the main routine without executing the subsequent processes. If peak cut control is not prohibited (NO in S21), the power management device 5 proceeds to S22.

[0048] In S22, the power management device 5 reads the predicted amount (initial predicted amount) calculated in the process of S12 in Figure 3 or the re-predicted amount calculated in the process of S16 from the memory 52.

[0049] In S23, the power management device 5 determines whether the predicted amount or re-predicted amount exceeds the second target amount TAG2 at the end of the period. If the predicted amount 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 cut control at the second timing (S24). After that, the power management device 5 returns the processing to the main routine.

[0050] If the predicted amount or re-predicted amount does not exceed the second target amount TAG2 at the end of the period (NO in S23), the power management device 5 determines whether the predicted amount or re-predicted amount exceeds the first target amount TAG1 at the end of the 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 cut control at the first timing (S26). After that, the power management device 5 returns the processing to the main routine.

[0051] If the predicted amount or re-predicted amount does not exceed the first target amount TAG1 at the end of the period (NO in S25), the power management device 5 determines that it will not perform peak cut control, at least at that point (S27). Subsequently, the power management device 5 returns the process to the main routine.

[0052] Thus, in this embodiment, the execution timing (first timing) when the predicted amount exceeds the first target amount but does not exceed the second target amount is delayed compared to the execution timing (second timing) of peak cut control when the predicted amount exceeds the second target amount TAG2. The second timing may be, for example, immediately after it is determined that the predicted amount exceeds the second target amount TAG2 (see periods D2 and D5 in Figure 2). However, the second timing is not limited to this and may be, for example, in the first half of the period. In contrast, the first timing may be in the second half of the period (see periods D3 and D6 in Figure 2). The first timing is not limited to a predetermined fixed timing, but may be variably determined based on the predicted amount (see period D7 in Figure 2).

[0053] The predicted quantity (which may also be a revised quantity) is not necessarily accurate. Even if the predicted quantity at the end of the period is calculated to exceed the first target value TAG1, the actual quantity may remain lower than the predicted quantity, and the actual quantity at the end of the period may not exceed the first target value TAG1. Therefore, simply put, peak cut control is not executed just because the predicted quantity is calculated to exceed the first target value TAG1. By delaying the timing of peak cut control execution as much as possible, unnecessary peak cut control can be avoided. Thus, the protection of the energy resource group 4 can be achieved more reliably while suppressing a decrease in user convenience. Therefore, according to this embodiment, peak cut of facility 100 can be performed more appropriately.

[0054] When the charging equipment 42 and vehicles 43,44 from the energy resource group 4 shown in Figure 1 are used for peak cut control, the switching of relays RY1 and RY2 is involved, and therefore the charging equipment 42 and vehicles 43,44 are subject to usage restrictions regarding the number of uses or usage period. Hereinafter, the charging equipment 42 and vehicles 43,44 (which may include relays RY1 and RY2) will be referred to as "first resources". On the other hand, some of the power loads 41 may have loose usage restrictions (or no usage restrictions). Such resources will be referred to as "second resources". Under these conditions, the power management device 5 may delay the execution timing of peak cut control using the first resources compared to the execution timing of peak cut control using the second resources when the predicted amount or re-predicted amount exceeds the first target amount TAG1. This can extend the lifespan of the first resources (especially relays RY1 and RY2).

[0055] Under conditions where there are no usage restrictions on the second resource as described above, the power management device 5 may perform peak cut control by using the second resource while not using the first resource (i.e., using only the second resource) when the predicted or re-predicted amount exceeds the first target amount TAG1. This makes it possible to more reliably extend the lifespan of the first resource (especially relays RY1 and RY2).

[0056] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0057] Facility 100, 1 distribution board, 2 PCS, 31-33 electricity meters, 4 energy resource groups, 41 power load, 42 charging equipment, 43, 44 vehicles, 5 power management devices, 51 processor, 52 memory, ESP server, M electricity meter, PG power grid, RY1, RY2 relays, 900 power system.

Claims

1. A power management system for managing the power of facilities connected to the power grid, The aforementioned facility includes a group of energy resources comprising one or more energy resources, each configured to allow for power adjustment, The system includes a power management device that performs peak-cut control to control the group of energy resources so as to peak-cut the amount of power supplied from the power system to the facility, The power management device is, At the start of a predetermined period, a predicted amount showing the expected time progression of the supplied power is obtained. The actual time-series data showing the supply amount of electricity during the aforementioned period is obtained. If the discrepancy between the predicted amount and the actual amount exceeds a specified amount, a new predicted amount is obtained by predicting the time progression of the supplied power amount again. If the predicted amount or the re-predicted amount exceeds the first target amount, the peak cut control is executed, A power management system that does not perform the peak cut control if the predicted amount or the re-predicted amount does not exceed the first target amount.

2. The power management device according to claim 1, wherein the power management device delays the execution timing of the peak cut 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, compared to the execution timing of the peak cut control when the predicted amount or the re-predicted amount exceeds the second target amount.

3. The power management device is, If the re-predicted amount exceeds the first target amount but the second target amount does not, the peak cut control is performed prior to the reference time within the period, The power management system according to claim 2, wherein if the re-predicted amount exceeds the second target amount, the peak cut control is executed after the reference time has elapsed.

4. The aforementioned group of energy resources is A first resource with usage restrictions regarding the number of uses or usage period for power adjustment, This includes a second resource with less restrictive usage conditions compared to the first resource, The power management device according to claim 2 or 3, wherein, when the re-predicted amount exceeds the first target amount, the timing of executing the peak cut control using the first resource is delayed compared to the timing of executing the peak cut control using the second resource.

5. The second resource is an energy resource that does not have the aforementioned usage restrictions. The power management device according to claim 4, wherein when the re-predicted amount exceeds the first target amount, the power management device performs the peak cut control using the second resource while not using the first resource.

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