JP2012060829A - Power supply system and power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system which conducts more refined control between an accumulator and an electric power system and saves electricity cost.SOLUTION: A power supply system includes: an accumulator 122 connected to a load 15 and accumulating electricity at the time that a nighttime electricity rate is applied; a remaining capacity detection part 13 detecting the remaining capacity of the accumulator 122; and a control part 14 which controls the power supply so that a minimum remaining electric power value, which is preset based on a peak electric power consumption value on a peak time zone obtained by learning and a contract electric power value, is remained until the peak time zone by using the detection result of the remaining capacity when controlling the supply from the accumulator 122 and the electric power system.

Description

  The present invention relates to a power supply system and a power supply method.

  In recent years, a power storage device that accumulates electric power at night and uses it during peak hours of daytime power consumption has been proposed (see, for example, Patent Document 1).

  In the power storage device of Patent Document 1, it is described that the electricity charge can be reduced by reducing the peak value.

JP 2009-296880 A

  However, in the said patent document 1, the control of the more detailed storage battery and commercial electric power system is not performed, and the saving of an electricity bill was inadequate.

  An object of the present invention is to provide a power supply system and a power supply method that can control the storage battery and the power system more finely in consideration of the above-described conventional problems and can save more electricity charges.

In order to achieve the above object, the first present invention provides:
A storage battery connected to the load that stores electricity at the time of setting electricity bills at night;
A remaining capacity detector for detecting a remaining capacity of the storage battery;
When controlling the supply from the storage battery and the power system to the power consumption of the load, the minimum remaining power set in advance based on the peak power consumption value and the contract power value in the peak time zone obtained from learning A power supply system including a control unit that controls the remaining capacity by using a result of detection of the remaining capacity so as to leave the amount until the peak time period.

The second aspect of the present invention
Supply from the storage battery and the power system is the power supply system according to the first aspect of the present invention in which the storage battery is given priority.

The third aspect of the present invention provides
The load is divided into a plurality of groups,
The storage battery is provided for each of the plurality of groups,
The power supply according to the second aspect of the present invention, wherein the control unit performs control to supply power of the storage battery having surplus power among the plurality of storage batteries to the group connected to the other storage batteries. System.

The fourth invention relates to
A load detector for detecting the power consumption of the load;
A storage battery that is connected to the load and stores electricity at the time of setting an electricity bill at night,
When the power consumption reaches a predetermined value determined from the contract power value, a control unit is provided that performs control so as not to exceed the contract power value in combination with the storage battery in addition to the power system. The power supply system.

The fifth aspect of the present invention relates to
A power storage step of storing power in a storage battery connected to a load at the time of setting an electricity rate at night;
A remaining capacity detecting step for detecting a remaining capacity of the storage battery;
When controlling the supply from the storage battery and the power system to the power consumption of the load, the minimum remaining power set in advance based on the peak power consumption value and the contract power value in the peak time zone obtained from learning And a control step of controlling using the detection result of the remaining capacity so as to leave the amount until the peak time zone.

The sixth invention relates to
In the power supply method of the fifth aspect of the present invention, at least when controlling the supply from the storage battery and the power system to the power consumption of the load, the peak power consumption value and the contract power value in the peak time zone obtained from learning Is a program for causing a computer to execute the control step of controlling using the detection result of the remaining capacity so that a preset minimum remaining power amount remains until the peak time period.

The seventh invention relates to
A recording medium on which a program of the sixth aspect of the present invention is recorded, which is a recording medium that can be processed by a computer.

  According to the present invention, it is possible to provide an electric power supply system and an electric power supply method capable of performing more detailed control of a storage battery and an electric power system and saving more electricity charges.

1 is a conceptual configuration diagram of a power supply system according to a first embodiment of the present invention. The figure which shows the graph of fluctuation of the power consumption of one day The figure which shows the flow of control of the electric power supply system in Embodiment 1 concerning this invention. The figure which shows the graph for demonstrating control of the electric power supply system in Embodiment 1 concerning this invention. The conceptual block diagram of the electric power supply system in Embodiment 2 concerning this invention The figure which shows the flow of control of the electric power supply system in Embodiment 2 concerning this invention. The figure which shows the structure of the modification of the electrical storage part of the electric power supply system in Embodiment 2 concerning this invention. The conceptual block diagram of the electric power supply system in Embodiment 3 concerning this invention

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
The power supply system according to the first embodiment of the present invention will be described below.

  FIG. 1 is a conceptual configuration diagram of a power supply system according to Embodiment 1 of the present invention. As shown in FIG. 1, the power supply system according to the first embodiment includes a power adjustment unit 11 connected to a commercial power system 10 and a power storage that stores power from the commercial power system 10 via the power adjustment unit 11. Unit 12, a remaining capacity detection unit 13 that detects the remaining capacity of power storage unit 12, and a control unit 14 that receives the result of the detected remaining capacity and controls power storage unit 12 and power adjustment unit 11. . A load 15 is connected to the power adjustment unit 11. As the load 15, an air conditioner 16, a PC (personal computer) 17, and a lighting device 18 are used.

  The power storage unit 12 is provided with a bidirectional inverter 121 for converting alternating current and direct current, and a storage battery 122 for storing electricity converted into direct current. The control unit 14 is provided with a memory 141. The memory 141 includes a time period during which the power consumption by the load 15 such as the air conditioner 16, the PC 17, and the lighting fixture 18 exceeds the contract power value, and the contract power value. A control program for the amount of power supplied from the storage battery 122 corresponding to the total amount of power exceeding the time and the time is recorded. In FIG. 1, new synthetic fibers are indicated by dotted lines.

  Next, fluctuations in power consumption at the load will be described.

  When high-voltage power reception is performed in a building or factory, an electronic watt-hour meter with a built-in maximum demand wattmeter (demand value) is attached for 30 minutes, and measurement is performed. If the high-voltage power reception is 500 kW or more, the contract power value is determined by discussion with the power company. If the maximum demand power exceeds the contract power value, it is necessary to pay an extra penalty than usual. Then, based on the maximum demand power (demand value), a new contract power value change is discussed.

  As described above, a penalty is generated when the power consumption exceeds the contract power value. Therefore, it is necessary to keep the power consumption below the contract power value.

  Here, in this Embodiment, the fluctuation | variation of the power consumption of the load 15 is acquired over multiple days beforehand. A graph of fluctuations in the power consumption of the load 15 is shown in FIG. FIG. 2 is a graph S showing the average amount of fluctuation in power consumption of the load 15 for a plurality of days in the summer, and the contract power value is set to 550 kW.

  As shown in FIG. 2, the power consumption increases rapidly from the morning and temporarily decreases at the break time of the lunch break. After the lunch break, the power consumption rises again and becomes the maximum. After that, power consumption decreases toward night. In such a load fluctuation curve of FIG. 2, it can be seen that the power consumption between 13:30 and 16:25 exceeds the contract power value W1 (550 kW). There will be a penalty between 13:30 and 16:30.

  Therefore, in the power supply system of the present embodiment, a load fluctuation curve as shown in FIG. 2 is measured over a plurality of days, and a reference power value W2 that is slightly lower than the contract power value is set, and the reference power value W2 The time (T1 to T2) exceeding the time and the power consumption amount every 30 minutes at the time exceeding the time are learned. In addition, the time exceeding the reference power value W2, the total power consumption exceeding the reference power value W2, and the amount of discharge every 30 minutes discharged from the storage battery 122 are determined and stored in the memory 141. The reason for learning the time when the power consumption exceeds the reference power value W2 based on the slightly lower power W2 as described above is to give a margin to the contract power value (details will be described later). . Moreover, since the demand value is an average value of power consumption every 30 minutes from 0 to 30 minutes and 30 minutes to 60 minutes every hour, the average value of power consumption for 30 minutes exceeds the reference power value W2. Are stored as T1 to T2. That is, in FIG. 2, the time when the reference power value W2 is exceeded is 13:15 to 16:40, but between 13:00 and 13:30 and between 16:30 and 17:00. Since the average value of the power consumption is smaller than the value of the reference power value W2, the time T1 stored in the memory 141 is 13:30, and the time T2 is 16:30. This point will also be described with reference to FIG. Also, the power load curve as shown in FIG. 2 can be obtained by providing a load sensor (not shown) in the load 15.

  Next, the operation of the power supply system according to the first embodiment will be described, and an example of the power supply method of the present invention will also be described.

  FIG. 3 is a control flowchart of the power supply system according to the first embodiment. Such a control flow is stored in the memory 141 of the control unit 14.

  In S <b> 10, the control unit 14 controls power storage by the power storage unit 12 during a nighttime electricity bill period (for example, from 23:00 to 7:00 on the next day). In the power storage unit 12, alternating current from the commercial power system 10 is converted into direct current by the bidirectional inverter 121 and stored in the storage battery 122. This S10 corresponds to an example of a power storage step of the present invention. The remaining capacity in the storage battery 122 is always detected by the remaining capacity detector 14. This control of remaining capacity detection corresponds to an example of the remaining capacity detection step of the present invention.

  Next, in S11, when the daytime electricity bill time zone (for example, from 7 o'clock to 23 o'clock) is reached, discharging from the power storage unit 12 is started. Specifically, direct current from the storage battery 122 is converted into alternating current by the bidirectional inverter 121 and supplied to the load 15 through the power adjustment unit 11. Here, the power adjustment unit 11 is controlled to give priority to the power supply from the power storage unit 12 over the commercial power system 10.

  Next, in S12, it is detected by the timer in the control unit 14 whether or not the time T1 acquired in advance by learning has been reached. If the time T1 has not been reached, the control proceeds to S13.

  Then, in S13, it is determined whether or not the remaining capacity of the storage battery has reached a specified remaining capacity B that can supply the total power amount A exceeding the reference power value W2. Here, since energy loss occurs in the supply process from the storage battery 122, the prescribed remaining capacity B that can supply the total power amount A corresponds to the total power amount A in consideration of the energy loss. .

  When the remaining capacity of the storage battery reaches the specified remaining capacity B, the power supply from the storage battery 122 is stopped in S14, and the control proceeds to S12. On the other hand, when the remaining capacity of the storage battery 122 has not reached the specified remaining capacity B, the power supply from the storage battery 122 is not stopped, and the control proceeds to S12.

  On the other hand, in S12, when the time reaches T1, control is performed so that the storage battery 122 is discharged based on a predetermined rule. FIG. 4 is an enlarged view of the load curve at times T1 to T2. T1 is set to 13:30 and T2 is set to 16:30. The demand value is an average value of power consumption every 30 minutes from 0 to 30 minutes and from 30 minutes to 60 minutes every hour. Therefore, as shown in FIG. 4, the time is divided every 30 minutes into areas d1, d2, d3, d4, d5, and d6, and the amount of power in the area exceeding the reference voltage W2 (540 kW) of each area is P1. , P2, P3, P4, P5, and P6, control is performed so that power is discharged from the storage battery 122 so as to compensate for the portion (hatched portion in FIG. 4) that exceeds the contract power value for each region. In this way, the control is performed so that the power supply amount from the commercial power system 10 becomes W2 lower than the contract power value W1 because the power supplied from the commercial power system 10 contracts due to the influence of noise or the like. This is to provide a margin so as not to exceed the power value.

  As shown in FIG. 4, in the present embodiment, between 13:30 and 14:00, control is performed so that power for P1 is discharged from the storage battery 122 and power is also supplied from the commercial power system 10. Done. And between 14: 00 to 14:30, control is performed so that power for P2 is discharged from the storage battery 122 and power is also supplied from the commercial power system 10, and from 14:30 to 15:00 In the meantime, control is performed so that power for P3 is discharged from the storage battery 122 and power is also supplied from the commercial power system 10. Between 15:00:00 and 15:30, power for P4 is stored in the storage battery 122. Is controlled so that power is supplied from the commercial power system 10 and from 15:30 to 16:00, power for P5 is discharged from the storage battery 122 and from the commercial power system 10. Control is performed so that power is supplied, and between 16: 00 and 16:30, power for P6 is discharged from the storage battery 122 and power is also supplied from the commercial power system 10. It is carried out.

  In order to facilitate understanding, explanation will be made using simple numerical values. For example, if the total power consumption from T1 to T2 is 2000 kWh, the total power consumption exceeding the reference power value W2 is 2000− (540 × 3) = 380 kWh, and this 380 kWh is the total power consumption A. The breakdown of the total electric energy (380 kWh) is p1 (30 kWh) + p2 (70 kWh) + p3 (90 kWh) + p4 (90 kWh) p5 (70 kWh) + p6 (30 kWh). Further, if the specified power amount B required to supply the total power amount A is 420 kWh, the storage battery 122 needs to remain 420 kWh until time T1, and each power amount p1, p2 , P3, p4, p5, p6, if the amount of power required to supply 35 kWh, 76 kWh, 99 kWh, 99 kWh, 76 kWh, 35 kWh, for example, 35 kWh is stored in the storage battery 122 between 13:30 and 14:00. From 14: 0 to 14:30, 76 kWh is supplied from the storage battery 122, and between 14:30 and 15:00, 99 kWh is supplied from the storage battery 122, and 15: 0 to 15: 30 kWh is supplied from the storage battery 122, and between 15:30 and 16:00, 76 kWh is supplied from the storage battery 122, and 16:00:00 Between 6:30, control is performed so as to supply 35kWh from the battery 122.

  As described above, the regions q1 and q2 that exceed the reference power value W2 also exist at 13: 0 to 13:30 and 16: 0 to 16:30, but on average, they exceed the reference power value W2. Therefore, the power supply from the storage battery 122 is not performed. In addition, since the average value does not exceed the reference power value W2, the times T1 to T2 stored in the memory 141 are 13:30 to 16:30.

  As described above, in S15, based on the power consumption every 30 minutes stored in the memory 141, the supply of power from the commercial power system 10 and the supply of power from the storage battery 122 are used together during times T1 to T2. The control is performed based on a predetermined rule. An example of the peak time zone of the present invention corresponds to the times T1 to T2 of the present embodiment, and an example of the peak power consumption value of the present invention is the power consumption during the times T1 to T2 of the present embodiment. It corresponds to a value (see graph S). An example of the minimum remaining power amount of the present invention corresponds to the prescribed remaining capacity B of the present embodiment. Moreover, said S12-S15 is equivalent to an example of the control step of this invention.

  Next, in S <b> 16, the storage battery 122 is discharged until the remaining capacity of the storage battery 122 is exhausted. When the remaining capacity of the storage battery 122 is exhausted, all of the power supply to the load 15 is performed from the commercial power system 10.

  And when it becomes the time zone of the electricity bill setting at night, as shown to S10, the electrical storage to the storage battery 122 is performed.

  As described above, in the power supply system of the present embodiment, the power supply from the commercial power system can be kept smaller than the contract power value, and the power stored at night can be used up as much as possible in the daytime. Therefore, it is possible to reduce the cost as much as possible.

  In addition, the contract power value can be lowered by suppressing the demand value, and the cost can be suppressed. In addition, when building a new building or factory, or when changing power receiving equipment from an electric power company, a low-capacity cable can be used, which can reduce costs.

  In the present embodiment, the time (T1 to T2) exceeding the reference power value W2 in the summer and the power consumption every 30 minutes at the time exceeding the reference power value W2 are learned, and the control program is stored in the memory 141. However, the time and power consumption exceeding the reference power value may be learned for each season, and different control programs may be stored for each season.

  Further, the power consumption amount of the load 15 is detected by a load sensor (not shown), and the result is stored in the memory 141. However, a load sensor 39 as shown in FIG. Data may be updated every week. For example, the control for the second week is performed based on the data for the first week in August, and the control for the third week is performed based on the control for the second week. Good. However, in a season where power consumption increases due to use such as cooling, it is more preferable to perform control in consideration of this point.

(Embodiment 2)
Next, a power supply system according to the second embodiment of the present invention will be described.

  Unlike the first embodiment, the power supply system according to the second embodiment has a configuration in which loads are divided into a plurality of groups and a power storage unit is provided for each group.

  FIG. 5 is a schematic configuration diagram of the power supply system according to the second embodiment. As illustrated in FIG. 5, the power supply system according to the second embodiment includes a power distribution unit 21 connected to the commercial power system 20 and three power adjustment units 22 a, 22 b, and 22 c connected to the power distribution unit 21. A power storage unit 23a that stores power from the commercial power system 20 through the power adjustment unit 22a, a remaining capacity detection unit 24a that detects the remaining capacity of the power storage unit 23a, and the commercial power system 20 through the power adjustment unit 22b. Power storage unit 23b that stores power from the power storage unit 23b, a remaining capacity detection unit 24b that detects the remaining capacity of the power storage unit 23b, a power storage unit 23c that stores power from the commercial power system 20 via the power adjustment unit 22c, and a power storage unit 23c. The remaining capacity detecting unit 24c for detecting the remaining capacity of the power supply unit, and the result of the detected remaining capacity, the power distribution unit 21, the power adjusting units 22a, 22b, 22c, the power storage units 23a, 23b, 23c And a control unit 25 for control. The control unit 25 is configured to communicate with a power adjustment unit, a power storage unit, a power distribution unit, and the like via a LAN using, for example, a server.

  The power storage unit 23a is provided with a bidirectional inverter 231a for converting alternating current and direct current, and a storage battery 232a for storing electricity converted into direct current, and the power storage unit 23b converts alternating current and direct current. And a storage battery 232b for storing electricity converted into direct current, and a power storage unit 23c that is converted into direct current and a bidirectional inverter 231c for converting alternating current and direct current. A storage battery 232c for storing electricity is provided.

  A plurality of air conditioners 26 are connected to the power adjustment unit 22a, a plurality of PCs (personal computers) 27 are connected to the power adjustment unit 22b, and a plurality of air conditioning units 22c are connected to the power adjustment unit 22c. The lighting fixture 28 is connected.

  Of the power storage units 23a, 23b, and 23c of the second embodiment, at least the power storage unit 23b connected to the PC 27 has a UPS (Uninterruptible Power Supply) function, and the power from the commercial power system 20 When the supply is stopped, control is performed so that power is supplied to the PC 27 for several minutes.

  An example of the group of the present invention corresponds to the plurality of air conditioners 26 of the present embodiment, corresponds to the plurality of PCs 27, and corresponds to the plurality of lighting fixtures 28.

  Next, the operation of the power supply system of the second embodiment will be described, and an example of the power supply method of the present invention will be described.

  In the second embodiment, the time exceeding the contract power value is the same as in FIGS. 2 and 4 used in the first embodiment. FIG. 6 is a diagram showing a control flow of the power supply system according to the second embodiment of the present invention.

  In S20, in the power supply system according to the second embodiment, the control unit 25 performs control so that power is stored by the power storage units 23a, 23b, and 23c during the nighttime electricity bill time zone. In the power storage units 23a, 23b, and 23c, alternating current from the commercial power system 20 is converted into direct current by the bidirectional inverters 231a, 231b, and 231c via the power distribution unit 21, and stored in the storage batteries 232a, 232b, and 232c. . This S20 corresponds to an example of the power storage step of the present invention. The remaining capacity in the storage batteries 232a, 231c, 231c is always detected by the remaining capacity detectors 24a, 24b, 24c. This control of remaining capacity detection corresponds to an example of the remaining capacity detection step of the present invention.

  Next, in S21, when the daytime electricity rate is reached, supply of power from the power storage units 23a, 23b, and 23c is started. Specifically, direct currents from the storage batteries 232a, 232b, and 232c are converted into alternating currents by the bidirectional inverters 231a, 231b, and 231c, and the respective loads (air conditioners 26 and PC27 are connected via the power adjustment units 22a, 22b, and 22c. To the lighting fixture 28). Here, the power adjustment units 22a, 22b, and 22c are controlled so as to give priority to the power supply from the power storage units 23a, 23b, and 23c over the commercial power system 20. In addition, when supply of the electric power from each electrical storage part 23a, 23b, 23c to the air conditioner 26, PC27, and the lighting fixture 28 is started, detection of the remaining capacity in the storage batteries 232a, 231c, 231c is detected. , 24b, 24c. This control of remaining capacity detection corresponds to an example of the remaining capacity detection step of the present invention.

  Next, in S22, a timer in the control unit 14 detects whether or not the time T1 obtained in advance by learning has been reached.

  If the time T1 has not been reached, it is determined in S23 whether any of the remaining capacities of the storage batteries 232a, 232b, 232c has reached a specified remaining capacity. Here, as in the first embodiment, if the total power amount exceeding the reference power value W2 is A, and the prescribed power amount required to supply the total power amount A is B, each storage battery 232a, 232b The specified remaining capacity of 232c is an amount obtained by distributing the required specified power amount B in proportion to the power consumption of the load connected to each storage battery 232a. Here, B is an amount in consideration of energy loss when supplying the electric energy A.

  In order to facilitate understanding, explanation will be made using simple numerical values. For example, the total power consumption from T1 (13:30) to T2 (16:30) is 2000 kWh, and the ratio of the power consumption of the air conditioner 26, the PC 27, and the air conditioner 28 during this period is 2: 1: 1. Then, the total power consumption exceeding the reference power value (540 kW) is 2000− (540 × 3) = 380 kWh. If this 380 kWh is the total power amount A and the specified power amount B required to supply this total power amount A is 420 kWh, the specified remaining capacity of the storage battery 232a is 420 × (2/4) ) And 210 kWh. The specified remaining capacity of the storage batteries 232b and 232c is 420 × (1/4), which is 105 kW. Note that the prescribed remaining capacity of the storage battery 232b connected to the PC 27 is an amount obtained by adding the amount of power that can be supplied to the PC 27 for a predetermined time during a power failure to the amount of power required from time T1 to T2. That is, since the power storage unit 23b also has a UPS function, electric power that can be supplied at the time of a power failure is always secured.

  When any one of the storage batteries 232a, 232b, and 232c reaches the specified remaining capacity, the supply of power from the storage battery that has reached the specified remaining capacity is stopped in S24.

  Next, in S25, electric power is supplied from a storage battery other than the supply stopped to a load connected to the storage battery that has been stopped. For example, when the remaining capacity of the storage battery 232a connected to the air conditioner 26 reaches a specified remaining capacity, the power from the storage batteries 232b and 232c is supplied to the air conditioner 26 through the power adjustment unit 22a. Note that power is also supplied from the storage batteries 232b and 232c to the PC 27 and the lighting fixture 28 connected thereto.

  Subsequently, in S26, it is detected whether or not the remaining capacities of all the storage batteries 232a, 232b, 232c have reached their respective specified remaining capacities. If the remaining capacities of all the storage batteries have not reached the respective specified remaining capacities, the control proceeds to S22.

  On the other hand, when the remaining capacities of all the storage batteries reach the respective specified remaining capacities, the power supply of all the storage batteries is stopped, and the control advances to S22.

  When the time reaches T1, in S28, control is performed so that the storage batteries 232a, 232b, and 232c are discharged. Here, as in the first embodiment, power is supplied from the storage batteries 232a, 232b, and 232c so as to compensate for portions that exceed the reference power value every 30 minutes. The power supply at this time is determined by learning based on the previous power consumption of each load connected to each storage battery. For example, when it is necessary to discharge 76 kWh of electric power from the storage battery between 14:00:00 and 14:30 in FIG. 4, as described above, the air conditioner 26, the PC 27, and the air conditioner 28 between T1 and T2 are used. If the ratio of power consumption is 2: 1: 1, 38 kWh, 19 kWh, and 19 kWh are supplied from the storage battery 232a, the storage battery 232b, and the storage battery 232c, respectively. In addition, said S21-S28 corresponds to an example of the control step of this invention.

  Next, in S29, discharging is performed until the remaining capacities of all the storage batteries 232a, 232b, 232c are exhausted. All of the power supply to is performed from the commercial power system 20. In this case as well, control may be performed so that power from another storage battery is supplied to a load connected to the storage battery having no remaining capacity. In short, it is only necessary to perform control so that the electric power stored at night is used up as much as possible in the daytime.

  And when it becomes the time zone | period of the electricity bill setting at night, as shown to S20, the electrical storage to storage battery 232a, 232b, 232c is performed.

  As described above, in the power supply system of the present embodiment, the power supply from the commercial power system can be kept smaller than the contract power value, and the power stored at night can be used up as much as possible in the daytime. Therefore, it is possible to reduce the cost as much as possible.

  In addition, the contract power value can be lowered by suppressing the demand value, and the cost can be suppressed. In addition, when building a new building or factory, or when changing power receiving equipment from an electric power company, a low-capacity cable can be used, which can reduce costs.

  Although the power storage unit 23b is described as having a UPS function in the second embodiment, the power storage units 23a and 23c may also have a UPS function.

  In addition, although a plurality of loads are connected to the power storage units 23a, 23b, and 23c of the second embodiment, the power storage unit with a UPS function has a capacity that can be connected to one or a small number of loads. Also good. Such a power storage unit can be configured as shown in FIG. The power storage unit 29 illustrated in FIG. 7 includes a control box 291 and a battery unit 292 connected to the control box 291. The control box 291 is provided with an input unit 293 of AC 200 to 270 V and an output unit 294 of AC 100 V and a maximum of 450 W. The control box 291 includes a LAN connection unit 295, a USB connection unit 296, an analog timer 297, and the like. As the battery portion 292, a battery in which two lithium iron phosphate batteries having a capacity of 50 Ah are connected can be used. Note that the two lithium iron phosphate batteries and the control box 291 are connected by a serial cable 298. In addition, power from the commercial power system 20 is input to the input unit 293 via a power distribution unit, a power adjustment unit, and the like, converted into direct current by an inverter, and charged to the lithium iron phosphate battery in the battery unit 292. On the other hand, for example, a load such as a PC is connected to the output unit 294. And the electrical storage part 29 connected to each load is connected to the server via LAN. In such a configuration, data of power consumption at each load is collected for a plurality of days, the total load amount is calculated based on the data, and control at times T1 to T2 as described in the first embodiment is performed. Etc. are stored in the memory. And the effect similar to Embodiment 2 can be acquired by discharging electric power from a storage battery between time T1-T2 according to the power consumption of each load. Note that a wireless LAN may be used instead of the wired LAN.

  In addition, devices owned by individuals such as PCs are entrusted to individual management and are difficult to be subject to power control integrated as energy management. By connecting the power storage units and connecting each power storage unit and the server via a LAN, the power consumption can be monitored by the server, and energy management can be performed comprehensively. The power storage unit with a UPS function having such a configuration can also be applied to the power storage unit of the first embodiment.

  In the first and second embodiments, the time period exceeding the reference power value is T1 to T2 and one time period. For example, 10: 0 to 12:00 and 13:30 to 16:30. The time zone exceeding the reference power may be divided into two. In that case, the control described with reference to FIG. 4 may be performed in each time zone.

(Embodiment 3)
Next, a power supply system according to a third embodiment of the present invention will be described. Unlike the first embodiment, the power supply system according to the third embodiment does not perform control based on the previously learned result, but detects the power consumption of the load in real time and controls the discharge from the storage battery.

  FIG. 8 is a schematic configuration diagram of the power supply system according to the third embodiment. As illustrated in FIG. 8, the power supply system according to the third embodiment includes a power adjustment unit 31 connected to the commercial power system 30 and a load that measures power consumption of a load 35 connected to the power adjustment unit 31. The sensor 39, the power storage unit 32 that stores power from the commercial power system 30 via the power adjustment unit 31, the remaining capacity detection unit 33 that detects the remaining capacity of the power storage unit 32, and the power consumption detected by the load sensor 39 And the control part 34 which receives the result of the detected remaining capacity and controls the electrical storage part 32 and the electric power adjustment part 31 is provided. An air conditioner 36, a PC (personal computer) 37, and a lighting fixture 38 are connected to the load 35. An example of the load detection unit of the present invention corresponds to the load sensor 39 of the present embodiment.

  Next, the operation of the power supply system according to the third embodiment will be described.

  The amount of power consumed by the load 35 is always detected by the load sensor 39, and the detection result is transmitted to the control unit 34. And the control part 34 starts discharge from the storage battery 322 at the time of reaching predetermined power consumption so that the average power consumption in 30 minutes may become below a contract power value.

  Specifically, for example, if the contract power value is 550 kW, a penalty is paid when 225 kWh or more of power is consumed at 550 kW × 0.5 h for 30 minutes. Therefore, for example, when the power consumption exceeds 100 kWh starting from 13:00, it can be controlled so that the supply of power from the storage battery 322 is started. If it reaches 100 kWh in 15 minutes, the storage battery 322 is discharged so that 100 kWh or more is not supplied from the commercial power system 30 in the remaining 15 minutes. For example, when the power consumption amount exceeds 200 kWh from the commercial power system 30 without using the commercial power system 30 and the storage battery 322 together, all power supply may be performed from the storage battery 322.

  The storage battery 322 is charged during the nighttime electricity bill.

  By controlling as described above, it is possible to prevent the contract power value from being exceeded and to reduce costs.

  In addition, the contract power value can be lowered by suppressing the demand value, and the cost can be suppressed. In addition, when building a new building or factory, or when changing power receiving equipment from an electric power company, a low-capacity cable can be used, which can reduce costs.

  The program of the present invention is a program that causes a computer to execute at least the operation of the control step of the power supply method of the present invention described above, and is a program that operates in cooperation with the computer.

  The recording medium of the present invention is a recording medium that records a program that causes a computer to execute all or part of the control steps of the above-described power supply method of the present invention, and is readable and read by the computer. The program is a recording medium for executing the operation in cooperation with the computer.

  The “step operation” of the present invention means the operation of all or part of the step.

  Further, one use form of the program of the present invention may be an aspect in which the program is recorded on a recording medium such as a ROM readable by a computer and operates in cooperation with the computer.

  Also, one use form of the program of the present invention is an aspect in which the program is transmitted through a transmission medium such as the Internet, a transmission medium such as light, radio wave, and sound wave, read by a computer, and operates in cooperation with the computer. Also good.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, but may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  The power supply system and the power supply method of the present invention have the effect of more finely controlling the storage battery and the power system, and can save more electricity charges, such as a power supply system for commercial buildings, factories, etc. Useful.

10, 20, 30 Commercial power system 11, 22a, 22b, 22c Power adjustment unit 12, 23a, 23b, 23c, 29 Power storage unit 13, 24a, 24b, 24c Remaining capacity detection unit 14, 25, 34 Control unit 15 Load 16 , 26, 36 Air conditioner 17, 27, 37 PC
18, 28, 38 Lighting fixture 21 Power distribution unit 121 Bidirectional inverter 122 Storage battery 141 Memory 291 Control box 292 Battery unit 293 Input unit 294 Output unit 295 LAN connection unit 296 USB connection unit 297 Analog timer

Claims (7)

A storage battery connected to the load that stores electricity at the time of setting electricity bills at night;
A remaining capacity detector for detecting a remaining capacity of the storage battery;
When controlling the supply from the storage battery and the power system to the power consumption of the load, the minimum remaining power set in advance based on the peak power consumption value and the contract power value in the peak time zone obtained from learning A power supply system comprising: a control unit that controls using the result of detection of the remaining capacity so as to leave the amount until the peak time period.   The power supply system according to claim 1, wherein supply from the storage battery and the power system prioritizes the storage battery. The load is divided into a plurality of groups,
The storage battery is provided for each of the plurality of groups,
The power supply system according to claim 2, wherein the control unit performs control to supply power of the storage battery having surplus power among the plurality of storage batteries to the group connected to the other storage batteries. . A load detector for detecting the power consumption of the load;
A storage battery that is connected to the load and stores electricity at the time of setting an electricity bill at night,
When the power consumption reaches a predetermined value determined from the contract power value, a control unit is provided that performs control so as not to exceed the contract power value in combination with the storage battery in addition to the power system. , Power supply system. A power storage step of storing power in a storage battery connected to a load at the time of setting an electricity rate at night;
A remaining capacity detecting step for detecting a remaining capacity of the storage battery;
When controlling the supply from the storage battery and the power system to the power consumption of the load, the minimum remaining power set in advance based on the peak power consumption value and the contract power value in the peak time zone obtained from learning And a control step of controlling using the detection result of the remaining capacity so as to leave the amount until the peak time period.   The power supply method according to claim 5, wherein at least the power consumption of the load is controlled by the peak power consumption value and the contract power value in the peak time zone obtained from learning when controlling the supply from the storage battery and the power system. A program for causing a computer to execute the control step of controlling based on the detection result of the remaining capacity so that a preset minimum remaining power amount remains until the peak time period.   A recording medium on which the program according to claim 6 is recorded, wherein the recording medium can be processed by a computer.