JP2015186276A - Power management system, power management method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power management system capable of measuring electric energy for calculating a compensation according to transferred electric energy in the case of transferring power from a storage battery installed on the power user side to a commercial power system.SOLUTION: A power storage system 52 is installed so as to discharge power to a commercial power system 2. A power storage system watt-hour meter 62 for measuring electric energy for charging in the case of charging the power storage system 52 is installed. A power bill calculation unit 72 calculates, from information including a measurement value of the electric energy for charging measured by the power storage system watt-hour meter 62, electric energy to be sold by a power user in which the power storage system 52 is installed.

Description

  The present invention relates to a power management system, a power management method, and a program.

2. Description of the Related Art In recent years, an energy management system including a power generation device using natural energy such as solar power generation and a storage battery has been known. A power management system that performs power management in a community composed of a plurality of power consumers is also known (see, for example, Patent Document 1). According to Patent Document 1, by providing a power storage system and a solar power generation facility, surplus power generated from the solar power generation facility of a power consumer is stored in a plurality of power storage systems, and the power is discharged when necessary. It is shown that it can be used.
In general, the electricity charge in the electricity supply-demand contract between the electric power company and the electricity consumer is calculated based on the measured value of the integrated watt-hour meter provided corresponding to the receiving point from the commercial power system Has been.

JP, 2014-030334, A

  However, in the general method for measuring electric energy using the above integrated watt-hour meter, the received electric power is consumed by the load of the electric power consumer, and a part of the electric power generated by the solar power generation facility is used in the electric power business. This is not a method for measuring the amount of electric power when the electric power consumer provides the electric power stored in the power storage system. Patent Document 1 discloses that power is accommodated by using a power storage system in an area composed of a plurality of power consumers, but describes a method for measuring the amount of power that power consumers can accommodate. It has not been. Therefore, as described above, even in an area composed of a plurality of power consumers, even if an attempt is made to exchange power using a power storage system such as Patent Document 1, it is not possible to measure the amount of power for calculating the price. There is a problem.

  In view of the above-described problems, the present invention provides a power management system capable of measuring the amount of power for calculating the consideration of the amount of power accommodated when accumulating power from a storage battery provided on the power consumer side to the commercial power system, An object is to provide a power management method and program.

  In order to solve the above-described problem, a power management system according to one embodiment of the present invention includes a power storage unit that can charge power from a commercial power system and can discharge power to the commercial power system. A power storage unit power measuring unit that measures the amount of electric power to be charged and discharged, a system power measuring unit that receives power from the commercial power system and transmits power to the commercial power system in a power flow direction and a reverse power flow direction, and The amount of power that electric power consumers buy and sell from the information on the amount of charge or discharge of the stored power measured by the power storage unit power measuring unit and the amount of power in the tidal direction or reverse power direction measured by the grid power measuring unit And an electric power amount calculation unit for calculating.

  In the power management system, the power storage unit power measurement unit measures at least a part of the charged power amount charged in the power storage unit as the amount of power sold.

  In the power management system, the power management system further includes a system power measurement unit that measures a power amount in a power flow direction received from the commercial power system, and the power amount calculation unit includes the power amount of the charge measured by the power storage unit power measurement unit And the amount of power sold by the power consumer is calculated from the amount of power in the tidal direction measured by the grid power measuring unit.

  In the power management system, the power amount calculation unit is a power amount obtained by subtracting a power amount in a forward power flow direction measured by the grid power measurement unit from a charge power amount measured by the power storage unit power measurement unit, or The amount of power obtained by subtracting the amount of electric power of discharge measured by the power storage unit power measurement unit from the amount of power in the reverse power flow direction measured by the grid power measurement unit, or the charge measured by the power storage unit power measurement unit The amount of power sold by the power consumer is calculated based on the amount of power that is the sum of the amount of power and the amount of power in the reverse flow direction measured by the grid power measuring unit.

  In the power management system, the power amount calculation unit is a power amount obtained by subtracting a power amount of charging measured by the power storage unit power measurement unit from a power amount in a forward power flow direction measured by the grid power measurement unit, or The amount of power purchased by the power consumer is calculated by subtracting the amount of power in the reverse flow direction measured by the grid power measuring unit from the amount of discharge measured by the power storage unit power measuring unit. It is characterized by calculating.

  In the power management system, the grid power measurement unit is provided on a lead-in line from the commercial power grid, and the power storage system is connected to the first connection line from the grid power measurement unit toward the load. A branching portion for branching the second connection line toward the portion is provided, and the power storage unit power measurement unit is provided in the second connection line.

  In the power management system, the power amount calculating unit sells power from a power amount of charging power measured by the power storage unit power measurement unit in a state where the power storage unit is disconnected from the commercial power system. The power amount of the power to be calculated is calculated.

  In the power management system, the power amount calculation unit is configured such that a power consumer purchases power from the electric energy of the discharge measured by the power storage unit power measurement unit in a state where the power storage unit is disconnected from the commercial power system. The power amount of the power to be calculated is calculated.

  In the power management method according to one aspect of the present invention, a power storage unit is provided so that power can be discharged to a commercial power system, and the power storage unit power measurement unit measures the amount of power charged when charging the power storage unit, From the information including the amount of power of the charge measured by the power storage unit power measurement unit, the amount of power sold by a power consumer provided with the power storage unit is calculated.

  A program according to an aspect of the present invention is provided with a power storage unit so that electric power can be discharged to a commercial power system, and a step of measuring the amount of electric power for charging when the power storage unit is charged by the power storage unit power measurement unit; And calculating the amount of electric power sold by an electric power consumer provided with the electric storage unit from information including the electric energy b2 of the charging measured by the electric storage unit electric power measurement unit.

  A power management system according to an aspect of the present invention is provided so as to be able to charge power from a commercial power system, and measures a power storage unit that discharges stored power and a power amount of power that is discharged from the power storage unit. From the power storage unit power measurement unit and information including the power amount of the power measured by the power storage unit power measurement unit, the amount of power to be purchased by the power consumer provided with the power storage unit is calculated. And a power amount calculation unit.

  ADVANTAGE OF THE INVENTION According to this invention, when accommodating electric power from the storage battery provided in the electric power consumer side to a commercial electric power grid | system, the electric energy for calculating the consideration according to the interchanged electric energy can be measured.

It is a block diagram which shows the example of whole structure of the power management system in the 1st Embodiment of this invention. It is explanatory drawing which shows the calculation formula of the electric power purchase amount corresponding to the case in the 1st Embodiment of this invention, and the electric power sales amount corresponding to the case. It is explanatory drawing which shows the flow of the electric power corresponding to the case assumed in the 1st Embodiment of this invention. It is explanatory drawing which shows the flow of the electric power corresponding to the case assumed in the 1st Embodiment of this invention. It is a flowchart which shows the calculation process of the electric power charge in the 1st Embodiment of this invention. It is a flowchart which shows the process which calculates the electric energy made into the object of charge in the 1st Embodiment of this invention. It is a block diagram which shows the example of whole structure of the power management system in the 2nd Embodiment of this invention. It is explanatory drawing which shows the calculation formula of the electric power purchase amount corresponding to the case in the 2nd Embodiment of this invention, and the electric power sales amount corresponding to the case. It is explanatory drawing which shows the flow of the electric power corresponding to the case assumed in the 2nd Embodiment of this invention. It is a flowchart which shows the calculation process of the electric power charge in the 2nd Embodiment of this invention. It is a flowchart which shows the process which calculates the electric energy made into the object of charge in the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of the overall configuration of the power management system according to the first embodiment of the present invention. The power management system in the present embodiment, for example, generates power in a customer facility such as a house, a commercial facility, or an industrial facility corresponding to a plurality of power consumers (hereinafter simply referred to as “customer”) in a certain range of area. It is managed collectively. Such a power management system corresponds to a so-called TEMS (Town Energy Management System), CEMS (Community Energy Management System), or the like. Note that such a power management system is, for example, an electric power company (retail business) that receives power supplied from an electric power company (high-order electric power company) related to the commercial power system 2 and retails the power to consumers. It may be operated by. In the following description, an electric power company that retails electric power to consumers using such a power management system is simply referred to as a retailer, and an electric power company that supplies electric power to the retailer. Is called an electric utility. A case where a customer purchases power from a retailer or the like is called “power purchase”, and a case where a customer sells power to a retailer or the like is called “power sale”. Moreover, when it shows collectively, without distinguishing a high-order electric power supplier side and a retailer side, it may be called "the exterior" of a consumer facility.

The power management system 100 according to the present embodiment targets power management for each electric facility 10 in a certain area (hereinafter, simply referred to as “area”) shown as the power management area 1 in FIG. I do. The customer facility 10 corresponds to, for example, a house, a commercial facility, or an industrial facility.
The grid power line 3 is configured to distribute the power from the commercial power grid 2 to each customer facility 10, and the power from the commercial power grid 2 is supplied to the grid power line 3 in each consumer facility 10. Supplied through.

  One customer facility 10 includes a power generation facility 51, a power storage system 52, a load 53, a power path branching unit 54, a power storage system control unit 55, an automatic switch 56, a system power watt-hour meter 61, and a power storage system watt-hour meter 62. Is provided.

  The power generation facility 51 is a facility that generates power on the customer facility 10 side. As the power generation facility 51, a solar power generation, a fuel cell, a gas engine generator, or the like is assumed. One customer facility 10 may have a plurality of power generation facilities, or a plurality of types of power generation facilities. The power generation facility 51 includes a circuit that converts the power of the power generation facility 51 into alternating current having the same voltage, frequency, and number of phases as the voltage, frequency, and number of phases of the commercial power system. It is assumed that the power generation equipment 51 is installed in at least one customer facility 10 in the area.

  The power storage system 52 stores surplus power, and discharges and outputs the stored power. The surplus power is the surplus power obtained by subtracting the power consumed by the load 53 of the customer from the power generated by the power generation facility 51. As a storage battery used for this electrical storage system 52, various batteries, such as a lithium ion battery, are employable, for example. The power storage system 52 includes a circuit that converts alternating-current charging power into direct current, and converts direct-current power (discharge power) due to discharge into alternating current having the same voltage, frequency, and number of phases as the commercial power system. The power storage system 52 is controlled by a power storage system control unit 55 under a CP (Constant Power) charging mode in which charging is performed with a predetermined constant power amount or a CP (Constant Power) discharging with a predetermined constant power amount. ) A discharge mode, a load following mode for discharging with the amount of power following the variation in the amount of power consumed by the customer's load 53, a surplus power following mode for charging with the amount of power following the variation in the amount of surplus power, etc. are set. it can. It is assumed that the power storage system 52 is installed in at least one customer facility 10 in the area.

  The load 53 collectively indicates devices and facilities that consume power in the customer facility 10. Examples of the load 53 include various electric appliances such as a lighting fixture, a refrigerator, a television, and an air conditioning appliance.

  The power path branching unit 54 is incorporated in, for example, the distribution board 60 and branches an electric circuit in the customer facility 10 (hereinafter simply referred to as “power path”). The power path branching unit 54 can form a power path so as to supply the commercial power system 2 to the load 53 in the customer facility 10. Further, the power path branching unit 54 can form a power path so that the power generated by the power generation equipment 51 is supplied to the load 53 in the customer facility 10. Further, the power path branching unit 54 can form a power path in the customer facility 10 so as to charge the power storage system 52 with power supplied from one or both of the commercial power system 2 and the power generation equipment 51. In addition, the power path branching unit 54 can form a power path in the customer facility 10 so that the power output from the power storage system 52 by discharging is supplied to the load 53.

  Furthermore, the power path branching unit 54 transmits the power generated by the power storage system 52 via the system power line 3 to other customer facilities 10 (hereinafter, when describing each customer facility, the customer facility 10 The power path can be formed so as to be supplied toward the “customer facility 11”. In the customer facility 11, this electric power can be supplied to the load 53 in the customer facility 11 or stored in the power storage system 52 in the customer facility 11.

  The power storage system control unit 55 controls the power storage system 52. In addition, the power storage system control unit 55 is connected in a communicable state with the in-compartment power management unit 71 via the network 70. The power storage system control unit 55 instructs the start / stop of charging / discharging or instructs the amount of charge / discharge power according to the charging / discharging plan of the power storage system received from the power management unit 71 in the interchange area. Are transmitted to the power storage system 52 to operate the power storage system 52.

  The power storage system control unit 55 may be incorporated in a gateway of a HEMS (Home Energy Management System), for example.

  The automatic switch 56 is incorporated in the distribution board 60, for example, and cuts off the supply of power from the commercial power system 2 according to the state of the commercial power system 2, and the like. When an accident that causes a power failure of the commercial power system 2 by disconnecting the system power line 3 and the power system branching from the distribution board 60 by turning off the automatic switch 56, the accident of the accident Safety can be ensured without supplying power to the point. For example, the detection of a power failure in the commercial power system 2 can be detected by an isolated operation detection function, a system protection function, a low voltage detection relay, or the like provided in the power generation facility 51, the power storage system 52, or the like. The automatic switch 56 can be shut off in conjunction with a signal issued after a power failure is detected by these power failure detection methods. Thus, at the time of a power failure of the commercial power system 2, the commercial power system 2 is cut off, but the consumer alone can make the power self-sufficient.

  The system power watt-hour meter 61 is a watt-hour meter that measures the power input / output from the system power line 3. The grid power meter 61 is installed at the entrance to the grid power line 3 indoors. The system power watt-hour meter 61 can measure the power (forward power flow) received from the system power line 3 side and the power (reverse power flow) transmitted to the system power line 3 side. The measured value of the grid power watt-hour meter 61 can be transferred to the power rate calculation unit 72 by communication via the network 70. When the measured value of the grid power watt-hour meter 61 is transferred to the power rate calculator 72, a meter ID is sent together with the measured value of the power amount to identify which consumer's power amount.

  The grid power meter 61 is configured to record the power amount at a certain time interval. In general, the amount of power is recorded at 30-minute intervals, and the difference from the amount of power recorded 30 minutes ago is the accumulated power amount for the 30 minutes. The amount of electric power in the forward and reverse flow at intervals of 30 minutes from 0:00 to 24:00 is recorded.

  The grid power meter 61 is provided with a wattmeter for power (forward power flow) received from the grid power line 3 side and a wattmeter for power (reverse power flow) transmitted to the grid power line 3 side separately. May be. Further, the measured value of the grid power watt-hour meter 61 may be transferred to the power rate calculation unit 72 by PLC (power line communication). In addition, there is no restriction | limiting in the system used for this communication, A general communication system can be utilized.

  The power storage system watt-hour meter 62 is a watt-hour meter that integrates the power charged in the power storage system 52 and the power discharged from the power storage system 52. The power storage system watt-hour meter 62 is installed between the power path branching unit 54 and the power storage system 52 so that the power charged and discharged to the power storage system 52 can be individually measured. The measured value of the power storage system watt-hour meter 62 can be transferred to the power rate calculation unit 72 via the network 70 by communication. When the measured value of the power storage system watt-hour meter 62 is transferred to the power rate calculation unit 72, a meter ID is sent together with the measured value of the power amount to identify which consumer's power amount.

  The power storage system watt-hour meter 62 may be provided with a power meter for charging the power storage system 52 and a power meter for discharging power from the power storage system 52 separately. Further, the measurement value of the power storage system watt-hour meter 62 may be transferred to the power charge calculation unit 72 by PLC (power line communication). In addition, there is no restriction | limiting in the system used for this communication, A general communication system can be utilized.

  In the power management area 1 composed of a plurality of customer facilities 10, an in-compartment-area power management unit 71 and a power charge calculation unit 72 are provided for the electrical facilities in the entire customer facility 10 belonging to the power management area 1.

  The accommodation area power management unit 71 is connected to the power storage system control unit 55 of each customer facility 10 via the network 70. As the network 70, it is possible to use an existing Internet network. The power management unit 71 in the accommodation area determines the power storage system 52 of the customer facility 10 to be charged or discharged at least in the power management area 1, and controls the charge / discharge plan or the start / stop of the charge / discharge. A function of instructing the unit 55; In addition to this, the content of the command to the power storage system control unit 55 may be a charge / discharge power, a charge / discharge mode, or the like.

  The power rate calculation unit 72 can acquire the measured values of the grid power watt hour meter 61 and the power storage system watt hour meter 62 of each customer facility 10. The power rate calculation unit 72 uses the measured power amount measured by the grid power watt-hour meter 61 and the measured power amount measured by the power storage system watt-hour meter 62 to purchase power at the customer facility 10. And determine the amount of electricity sales. Then, the power rate calculation unit 72 determines the billing amount by multiplying the determined power purchase amount and power sales amount by a predetermined unit price. The power rate calculation unit 72 may be incorporated in the HEMS gateway, or may be configured to have this function in any device in the power management system 100.

  In addition, the structure of this embodiment uses the existing electric power generation equipment 51 and the electrical storage system 52 in each customer facility 10 of the some customer in the area of a fixed range as it is, and the house corresponding to the said some customer Further, it is possible to shift to a power management system 100 that collectively manages power in a customer facility such as a commercial facility or an industrial facility.

  Next, calculation of the power charge in this embodiment will be described. As described above, in the present embodiment, power is interchanged in the power management area 1 including a plurality of customer facilities 10. The power rate calculation unit 72 in the present embodiment performs a highly fair power rate calculation for the customer facility 10 belonging to such a power management area 1.

  In the power management system 100 as shown in FIG. 1, the power charged in the power storage system 52 of each customer facility 10 is not necessarily the power generated by the power generation facility 51 of the customer facility 10. . Further, the electric power discharged from the power storage system 52 is not necessarily used by the load 53 of the customer facility 10. For example, in the power management system 100 configured as shown in FIG. 1, when surplus power is generated in the power generated by the power generation equipment 51 of the customer facility 10, the surplus power passes through the system power line 3, There is a possibility that it is sent to another customer facility 10 and used in a load 53 of another customer facility 10 or charged in the power storage system 52 of another customer facility 10. Further, when surplus power is generated in the power generated by the power generation facility 51 of the customer facility 11, the surplus power is sent to the customer facility 10 via the system power line 3, and the customer facility 10 There is a possibility that the power storage system 52 of the customer facility 10 is charged. In consideration of this, in the method of calculating the power rate only by the power amount of the grid power watt-hour meter 61, it is impossible to accurately grasp even where and how much surplus power is supplied, and the grid power watt-hour meter Since the electricity charge is calculated only with the amount of power 61, the reliability of the calculated electricity charge is low, and thus a highly fair electricity charge cannot be obtained.

Therefore, in the present embodiment, when the power is stored in the power storage system 52, it is assumed that the power is sold from the consumer to an electric power company such as a retail business, and the electric power price for the sold power is calculated.
Here, a general case different from the present embodiment is illustrated for comparison. In a general case, the consumer of the customer facility 10 physically owns the power generation equipment 51 and the power storage system 52 of the customer facility 10, and the physical owner of the power storage system 52 The owner of the right to use the power stored in the system 52 is not considered separately.
On the other hand, in the present embodiment, the physical owner of the power storage system 52 and the owner of the right to use the power stored in the power storage system 52 are calculated so that a highly fair power charge can be calculated. I think in distinction. Then, regarding the power stored in the power storage system 52, it is considered that there was power trading when the power was stored in the power storage system 52 regardless of the physical owner of the power storage system 52. Here, a case where the physical owner of the power storage system 52 and the owner of the right to use the power stored in the power storage system 52 are different is illustrated. For example, the physical owner of the power storage system 52 is a consumer, and the owner of the right to use the power stored in the power storage system 52 is another consumer or an electric power company (retailer). Is mentioned. Further, a case where the physical owner of the power storage system 52 and the owner of the right to use the power stored in the power storage system 52 are the same is illustrated. For example, the physical owner of the power storage system 52 and the owner of the right to use the power stored in the power storage system 52 may be the same electric power company (retail business).

  In other words, in the present embodiment, the customer may charge power to the power storage system 52 of the customer facility 10 or may transmit power from the customer facility 10 to another place via the system power line 3. Similarly, it is assumed that these electric powers are sold. The power charged in the power storage system 52 is assumed to have been sold to, for example, an electric power company regardless of the physical owner of the power storage system 52. Similarly, when a consumer uses power discharged from the power storage system 52 of the customer facility 10 or receives power from another location via the system power line 3, the power is purchased. It is assumed that it was electrified.

  Based on the above concept, in this embodiment, in addition to the grid power meter 61, a power storage system energy meter 62 is installed in the customer facility 10 so that a highly fair power trading amount can be calculated. ing. Hereinafter, with reference to FIG. 2 to FIG. 4, calculation of the power purchase amount and the power sales amount will be described for each assumed case.

  FIG. 2 is an explanatory diagram illustrating an assumed case and formulas for calculating a power purchase amount and a power sales amount corresponding to the case. Here, k1 is the electric energy of the forward flow (electric power received from the system power line 3 side) measured by the system power energy meter 61. k2 is the electric energy of the reverse power flow (electric power transmitted to the system power line 3 side) measured by the system power energy meter 61. b <b> 1 is the amount of discharged power measured by the power storage system watt hour meter 62. b <b> 2 is the amount of charging power measured by the power storage system watt-hour meter 62. P is the amount of electric power sold or purchased between a consumer and an electric power company such as a retailer. 3 and 4 are explanatory diagrams showing the flow of power corresponding to the assumed case shown in FIG.

  As shown in FIG. 2, when the power storage system 52 is charged with power input from another place via the system power line 3 and surplus power of the power generation equipment 51, power is sold, and the power amount P of power sales is , “P = b2−k1” (case (1)). At this time, the load 53 is covered by the power generation equipment 51 of the customer facility 10.

FIG. 3A illustrates the flow of power in case (1). In this case (1), since the power storage system 52 is charged with power, it is sold. The amount of power to the power storage system 52 is measured by the power storage system watt-hour meter 62 as the power amount b2. The amount of power charged in the power storage system 52 is the amount of power sold, and part of the amount is the amount of power sent from another location via the system power line 3. The amount of power from another location is measured by the system power watt-hour meter 61 as the amount of power k1. Therefore, the amount of power P sold is
P = b2-k1
As required.

  Next, as shown in FIG. 2, when the surplus power of the power generation facility 51 and the discharge power of the power storage system 52 are used at different locations via the system power line 3, the power is sold, and the power amount P of the power sale is , “P = k2−b1” (case (2)).

FIG. 3B illustrates the flow of power in the case (2). In this case (2), since electric power is transmitted to the outside via the system power line 3, the power is sold. The amount of power sent to another place via the system power line 3 is measured as the amount of power k2 of the system power watt-hour meter 61. The electric energy k2 includes the electric energy discharged from the power storage system 52. The amount of power discharged from the power storage system 52 is the power amount b1 measured by the power storage system watt hour meter 62, and this power amount has already been bought and sold. Therefore, the amount of power P sold is
P = k2-b1
As required.

  Next, as shown in FIG. 2, the power storage system 52 is charged with electric power input from another place through the system power line 3, and the load 53 is covered with electric power from the power generation facility 51 and electric power from another place. In this case, power purchase is made, and the amount of power P for power purchase is obtained as “P = k1−b2” (case (3)).

FIG. 3C illustrates the flow of power in case (3). In this case (3), since power from the outside is received via the system power line 3, it is a power purchase. As shown in FIG. 3C, the amount of power sent from another place via the system power line 3 is stored in the power storage system 52 and sent to the load 53. Electric power is stored in the power storage system 52, but even if power from another place is stored in the power storage system 52, the owner of the power is the same, so it is not sold. The amount of power obtained by subtracting the amount of power stored in the power storage system 52 from the amount of power sent from another location is the amount of power purchased by the customer facility 10. The amount of power sent from another location is measured as the amount of power k1 of the grid power watt-hour meter 61. The amount of power stored in the power storage system 52 is measured as the power amount b2 of the power storage system watt-hour meter 62. Therefore, the amount of power P to be purchased is
P = k1-b2
As required.

  Next, as shown in FIG. 2, when the electric power discharged from the power storage system 52 is used at another location via the system power line 3, the load 53 is covered by the power from the power generation facility 51 and the power from the power storage system 52. Therefore, the power purchase amount P is obtained as “P = b1−k2” (case (4)).

FIG. 4A illustrates the flow of power in case (4). In this case (4), power is purchased because the power is discharged from the power storage system 52. That is, since the power stored in the power storage system 52 has already been bought and sold, using the power discharged from the power storage system 52 is equivalent to purchasing power. Of the amount of power discharged from the power storage system 52, the amount of power consumed by the load 53 of the customer facility 10 is the power obtained by subtracting the amount of power sent to another location from the amount of power discharged from the power storage system 52. Amount. The amount of power discharged from the power storage system 52 is measured as the power amount b1 of the power storage system watt-hour meter 62. The amount of power sent to another location is measured as the amount of power k2 of the grid power watt-hour meter 61. Therefore, the amount of power P to be purchased is
P = b1-k2
As required.

  Next, as shown in FIG. 2, when the load 53 is covered by the generated power from the power generation facility 51 and the power sent from another place via the system power line 3, the power purchase is made. The electric energy P is obtained as “P = k1” (case (5)).

FIG. 4B illustrates the flow of power in case (5). In such a case (5), the amount of power sent to the load 53 is the sum of the amount of power from the power generation facility 51 and the amount of power from another location. The power from the power generation facility 51 to the load 53 is irrelevant to the calculation of the charge. The amount of power from another location is measured as the amount of power k1 of the grid power watt-hour meter 61. Therefore, the amount of power P to be purchased is
P = k1
As required.

  Next, as shown in FIG. 2, when the surplus power generated by the power generation facility 51 is charged by the power storage system 52 and used in another place via the system power line 3, the power is sold. Is obtained as “P = k2 + b2” (case (6)).

  FIG. 4C illustrates the flow of power in case (6). In such a case (6), since the power storage system 52 is charged and external power is supplied, the power is sold.

In such a case (6), the amount of power from the power generation facility 51 is the sum of the charged power of the power storage system 52 and the amount of power sent to another location via the system power line 3. The charging power for the power storage system 52 and the power sent to another place are both sold. The charging power of the power storage system 52 is measured as the power amount b1 of the power storage system watt-hour meter 62. The amount of power sent to another location is measured as the amount of power k2 of the grid power watt-hour meter 61. Therefore, the power amount P for selling power is
P = k2 + b2
As required.

  Next, with reference to FIG. 5 and FIG. 6, the power rate calculation process in the power rate calculation unit 72 will be described. FIG. 5 is a flowchart showing the calculation process of the power charge by the power charge calculation unit 72.

  As shown in FIG. 5, the power rate calculation unit 72 acquires the measured value of the grid power watt hour meter 61 of the customer facility 10 via the network 70 (step S1), and measures the power storage system watt hour meter 62. A value is acquired (step S2). Then, the power charge calculation unit 72 calculates the amount of power to be charged based on the calculation formula shown in FIG. 2 (step S3), and multiplies the amount of power to be charged by a predetermined value. Then, a power charge is calculated (step S4).

  FIG. 6 is a flowchart showing processing for calculating the amount of power to be charged in step S3.

  As illustrated in FIG. 6, the power rate calculation unit 72 determines whether or not the measured values b1 and b2 of the power storage system watt hour meter 62 are both “0” (step S101). When it is determined that the measurement value b of the power storage system watt hour meter 62 is not “0” (step S101: No), the power charge calculation unit 72 is based on the measurement values b1 and b2 of the power storage system watt hour meter 62. Then, it is determined whether the amount of power measured by the power storage system watt-hour meter 62 is the amount of discharged power or the amount of charged power (step S102). When it is determined that the amount of charging power is present (step S102: Yes), the power charge calculation unit 72 is based on the measured values k1 and k2 measured by the system power watt-hour meter 61. It is determined whether the amount of power measured in step 1 is a forward power flow amount or a reverse power flow amount (step S103). When it is determined in step S103 that the power amount measured by the grid power watt hour meter 61 is a forward tidal power amount (step S103: Yes), the power rate calculation unit 72 includes the power storage system watt hour meter. The charging power amount (b2) measured at 62 is compared with the forward power flow amount (k1) measured by the grid power watt-hour meter 61 (step S104). As a result of the determination in step S104, when it is determined that the charging power amount (b2) is greater than the forward power flow amount (k1) (step S104: Yes), the power rate calculation unit 72 is the case (1) in FIG. Assuming that there is power, P is calculated as “P = b2−k1” (step S105).

  On the other hand, when it is determined in step S101 that the measurement value b of the power storage system watt hour meter 62 is “0” (step S101: Yes), the power rate calculation unit 72 is case (5) in FIG. Then, the power amount P for power purchase is calculated as “P = k1” (step S106). In this case (5), “K1 = 0” may be used.

  When it is determined in step S102 that the amount of power measured by the power storage system watt hour meter 62 is discharge power (step S102: No), the power rate calculation unit 72 measures the power amount of power measured by the power storage system watt hour meter 62. The discharge electric energy (b1) thus measured is compared with the reverse flow electric energy (k2) measured by the system electric energy meter 61 (step S107). As a result of the determination in step S107, when it is determined that the discharge power amount (b1) is larger than the reverse power flow amount (k2) (step S107: Yes), the power rate calculation unit 72 is the case (4) in FIG. Assuming that there is power, P is calculated as “P = b1−k2” (step S108).

  When it is determined in step S107 that the discharge power amount (b1) is smaller than the reverse power flow amount (k2) (step S107: No), the power rate calculation unit 72 is assumed to be case (2) in FIG. The amount of power P for power sale is calculated as “P = k2−b1” (step S109).

  When it is determined in step S103 that the amount of power measured by the grid power watt-hour meter 61 is reverse power flow (step S103: No), the power rate calculation unit 72 uses the case (6 in FIG. 2). ) Is calculated as “P = k2 + b1” (step S107).

  As described above, the power management system 100 according to the present embodiment calculates the consideration for the amount of power accommodated when accumulating power from the power storage system provided on the power consumer side to the commercial power system 102. The amount of power can be measured.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. FIG. 7 is a configuration diagram showing an example of the overall configuration of the power management system according to the second embodiment of the present invention. The power management system 100A according to the present embodiment performs power management for the electrical equipment for each customer facility 110 in a certain range of areas shown as the power management area 101 in FIG.
The grid power line 103 is configured to distribute the power from the commercial power grid 2 to each customer facility 110, and the power from the commercial power grid 102 is supplied to the grid power line 3 in each of the consumer facilities 110. Supplied through.

  In addition, the power generation equipment 151, the power storage system 152, the load 153, the power path branching unit 154, the power storage system control unit 155, the automatic switch 156, the distribution board 160, the system power watt-hour meter 161, the power storage system watt-hour meter 162, the network 170, the in-compartment power management unit 171 and the power rate calculation unit 172 are the power generation equipment 51, the power storage system 52, the load 53, the power path branching unit 54, the power storage system control unit 55, and the automatic switch in the first embodiment. 56, distribution board 60, grid power watt-hour meter 61, power storage system watt-hour meter 62, network 70, interchangeable area power management unit 71, and power rate calculation unit 72, and description thereof will be omitted.

  Unlike the power management system 100 of the first embodiment, the power management system 100A of the present embodiment includes an opening / closing operation storage unit 181. In the switching operation storage unit 181, switching information of the automatic switch 156 indicating whether or not the connection state between each unit in the customer facility 110 and the system power line 103 is blocked by the automatic switch 156. Remembered. The opening / closing information in the opening / closing operation storage unit 181 is transferred to the power rate calculation unit 172 through communication via the network 170.

  In the first embodiment described above, the power rate calculation unit 72 uses the measured values (k1 and k2) of the power measured by the grid power watt-hour meter 61 and the power measured by the power storage system watt-hour meter 62. From the measured values (b1 and b2), the power purchase amount and the power sales amount in the customer facility 10 are determined.

  On the other hand, in the second embodiment, the power rate calculation unit 172 measures the measured values of energy (k1 and k2) measured by the grid power energy meter 161 and the power storage system energy meter 162. From the measured values (b1 and b2) of the electric energy, the power purchase amount and the electric power sales amount at the customer facility 110 are determined, and the opening / closing information of the automatic switch 156 from the opening / closing operation storage unit 181 is used to determine the demand. The amount of electricity purchased and the amount of electricity sold at the home facility 110 are determined.

FIG. 8 shows an assumed case, the power purchase amount and sales corresponding to the case when the automatic switch 156 is off (the automatic switch 156 is opened and the circuit is held in a cut-off state). It is explanatory drawing which shows the calculation formula of quantity. FIG. 9 is an explanatory diagram showing the flow of power corresponding to the assumed case shown in FIG.
For example, when the automatic switch 156 is turned off due to a power failure in the commercial power system 102, the self-sufficiency of electric power for each consumer is used for each consumer using the power that can be supplied in the customer facility 110. Enable self-sufficiency.

As shown in FIG. 9, when the automatic switch 156 is off, the customer facility 110 is disconnected from the system power line 103. For example, in the above case, as shown in FIG. 9A, the surplus power from the power generation facility 151 is sold only to the power storage system 152 of the customer facility 110. The power amount of the power storage system power meter 162 is measured by the power storage system power meter 162 as the power amount b2. Therefore, when the automatic switch 156 is off, the amount of power P to be sold is
P = b2
As required.

Similarly, in the above case, as shown in FIG. 9B, the other party from which the consumer can purchase power is only the power storage system 152 of the consumer facility 110. The amount of power discharged from power storage system 152 is measured as power amount b <b> 1 measured by power storage system watt-hour meter 162. Therefore, when the automatic switch 156 is off, the amount of power P to be purchased is
P = b1
As required.

  FIG. 10 is a flowchart showing the calculation process of the power charge in the power charge calculation unit 172.

  As illustrated in FIG. 10, the power rate calculation unit 172 acquires the measurement value of the grid power watt hour meter 161 of the customer facility 110 via the network 170 (step S201), and measures the power storage system watt hour meter 162. A value is acquired (step S202). Moreover, the electric power charge calculation part 172 acquires the opening / closing information of the automatic switch 156 via the network 170 (step S203). Then, the power rate calculation unit 172 determines whether or not the automatic switch 156 is off from the acquired opening / closing information of the automatic switch 156 (step S204).

  If the automatic switch 156 is on in step S204, the amount of power to be charged when the switch is on is calculated based on each measured value (step S205). The calculation of the amount of power to be charged when the switch is on is the same as the processing in the first embodiment shown in FIG. 6, and the description thereof is omitted. If the automatic switch 156 is off in step S204, the amount of power to be charged when the switch is off is calculated based on each measured value (step S206). After the amount of power to be charged is calculated in step S205 or step S206, the power rate calculation unit 172 multiplies this power amount by a predetermined value to calculate a power rate (step S207).

  FIG. 11 is a flowchart showing processing for calculating the amount of power to be charged when the switch is turned on in step S206. Since the automatic switch 156 is off, the processing shown below is performed based on a condition in which power is not supplied between the higher-level electric utility and the retailer.

  The power rate calculation unit 172 determines whether the amount of power measured by the power storage system watt-hour meter 162 is discharge power or charge power (step S301). When it is determined that the electric power is charged (step S301: Yes), the power charge calculation unit 172 calculates the power amount P for selling power as “P = b2” (step S302). When it is determined that the electric power is discharged (step S301: No), the power rate calculation unit 172 calculates the power amount P for purchasing power as “P = b1” (step S303).

  As described above, in the second embodiment of the present invention, even when the automatic switch 156 is turned off at the time of a power failure, the purchase or sales amount of power can be calculated.

  In the second embodiment described above, the opening / closing operation storage unit 181 stores opening / closing information of the automatic switch 156, but stores information such as a condition for turning on / off the automatic switch 156 and a command signal. You may make it do. Alternatively, the voltage of the system power supply on the system power line 103 side may be measured from the automatic switch 156, and the time when the voltage of the system power supply does not reach a predetermined voltage may be stored in the switching operation storage unit 181.

  As described above, the power management system 100 </ b> A according to the present embodiment uses the power for calculating the consideration of the accommodated power amount when the power is accommodated from the power storage system provided on the power consumer side to the commercial power system 102. The amount can be measured. Note that the power management system 100A can temporarily store, in the power storage system, the power generated by the power generation equipment 151 during the period when the automatic switch 156 is in the cut-off state. In addition, the stored power can be used as power for accommodating other consumers after the automatic switch 156 is released from the shut-off state. As a result, it is possible to use surplus power during the period when the automatic switch 156 is in the cut-off state without waste, and it is possible to calculate the power charge by an appropriate charging method.

  Moreover, the following effects can be expected by applying the power management system 100 (100A). For example, the case where the generated power cannot be stored in the power storage system depending on the power capacity that can be charged in the power storage system or the amount of power generated by the solar power generation facility may occur for each consumer. On the other hand, surplus power of solar power generation is required for power consumers who consume a lot of electricity during the day compared to the amount of power that can be generated by solar power generation facilities Is hardly generated, and even if a power storage facility is provided, a sufficient amount of charge may not be ensured. In such a case, the electric power generated by the solar power generation cannot be used in the time zone except the time zone in which the solar power generation is in the power generation state. Thus, depending on the capacity of the actually installed equipment and various conditions, there may be a case where the power generated by the photovoltaic power generation is excessive and the available power cannot be used effectively. In this case, surplus power that is expected to be unable to be stored in these power storage systems is sent to a customer who has a power storage system with a sufficient amount of power to be stored. Can be used. The power management system 100 (100A) can also measure the amount of power for power interchange in such a case.

Moreover, the owner of the photovoltaic power generated in a certain dwelling unit is usually the owner of the photovoltaic power generation facility. When this photovoltaic power is charged into another storage unit's power storage system and the power is used in another unit, the owner of the photovoltaic power generation is responsible for the power provided by the dwelling unit. It is thought that we can receive consideration. Even in such a case, by applying the power management system 100 (100A), the owner of the photovoltaic power generation can receive the price of the provided power from the resident of the dwelling unit using the provided power. become.
In addition, the above example is the power interchange between two dwelling units. However, power can be interchanged with more dwelling units and stores, condominiums, office buildings, factories, etc. using a storage battery. It is possible to use electric power more effectively in the area where it can compete.

A program for realizing all or part of the functions of power management system 100 (100A) is recorded on a computer-readable recording medium, and the program recorded on this recording medium is read into the computer system and executed. By doing so, you may process each part. Here, the “computer system” includes an OS and hardware such as peripheral devices.
Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.
In the above-described embodiment, the power management system receives an electric power supply from the electric power company (upper electric power company) related to the commercial power system 2 and retails the electric power to the consumer (retail business). The case where it is operated by the As described above, the retailer is not limited to a case where the retailer is different from the higher-order electric utility. The retailer may be a higher-order electric operator.

1, 101: Power management area 100, 100A: Power management system 2, 102: Commercial power system 3, 103: System power line 10, 110: Customer facility 51, 151: Power generation facility 52, 152: Power storage system (power storage unit)
53, 153: Load 54, 154: Power path branching unit 55, 155: Power storage system control unit 56, 156: Automatic switch 61, 161: System power watt-hour meter (system power measuring unit)
62, 162: Power storage system watt-hour meter (power storage unit power measurement unit)
70, 170: Network 71, 171: Power management section 72, 172 in the interchange area: Electricity charge calculation section (electric energy calculation section)
181: Opening / closing operation storage unit

Claims (11)

A power storage unit that can charge power from the commercial power system and discharge power to the commercial power system is provided,
A power storage unit power measurement unit that measures the amount of power to be charged and discharged to the power storage unit;
A system power measurement unit that measures the amount of power received from the commercial power system and transmitted in the power flow direction and the reverse power flow direction to the commercial power system;
The electric power consumer buys and sells from the information on the amount of charge or discharge of the stored power measured by the power storage unit power measurement unit and the amount of power in the tidal direction or reverse power direction measured by the grid power measurement unit A power management system comprising: a power amount calculation unit that calculates the amount. The power management system according to claim 1, wherein the power storage unit power measurement unit measures at least a part of the charged power amount charged in the power storage unit as power to sell. A grid power measuring unit that measures the amount of power in the tidal direction to receive power from the commercial power grid,
The power amount calculating unit sells power sold by a power consumer from the power amount of the charge measured by the power storage unit power measuring unit and the power amount in the tidal direction measured by the grid power measuring unit. The power management system according to claim 1, wherein the power amount of the power is calculated.   The power amount calculation unit is a power amount obtained by subtracting a power amount in a forward power flow direction measured by the grid power measurement unit from a charge power amount measured by the power storage unit power measurement unit, or the grid power measurement unit The amount of electric power obtained by subtracting the amount of electric power of discharge measured by the power storage unit power measurement unit from the amount of power in the reverse power flow direction measured by the above, or the power amount of charging measured by the power storage unit power measurement unit and the system The power management system according to claim 3, wherein the amount of power sold by the power consumer is calculated based on the amount of power obtained by adding the amount of power in the reverse power flow direction measured by the power measuring unit.   The power amount calculation unit is a power amount obtained by subtracting a power amount of charging measured by the power storage unit power measurement unit from a power amount in a forward power flow direction measured by the system power measurement unit, or the power storage unit power measurement. Calculating the amount of power to be purchased by a power consumer from the amount of power obtained by subtracting the amount of power in the reverse power flow direction measured by the grid power measuring unit from the amount of power of discharge measured by the unit. The power management system according to claim 3 or 4. The grid power measurement unit is provided on a lead-in line from the commercial power grid,
The first connection line heading from the system power measurement unit to the load is provided with a branch unit that branches the second connection line heading from the first connection line to the power storage unit,
The power management system according to any one of claims 3 to 5, wherein the power storage unit power measurement unit is provided in the second connection line.   The power amount calculation unit calculates the amount of power sold by the power consumer from the amount of charging power measured by the power storage unit power measurement unit in a state where the power storage unit is disconnected from the commercial power system. The power management system according to claim 1, wherein the power management system is calculated.   The power amount calculation unit calculates the amount of power to be purchased by a power consumer from the amount of electric power of the discharge measured by the power storage unit power measurement unit in a state where the power storage unit is disconnected from the commercial power system. The power management system according to claim 7, wherein the power management system is calculated. A power storage unit is provided so that power can be discharged to the commercial power system,
Measure the amount of power for charging when charging the power storage unit by the power storage unit power measurement unit,
A power management method, comprising: calculating the amount of power sold by a power consumer provided with the power storage unit from information including the amount of power of charging measured by the power storage unit power measurement unit. A power storage unit is provided so that power can be discharged to the commercial power system,
A step of measuring the amount of electric power for charging when the power storage unit is charged by the power storage unit power measurement unit;
Calculating the amount of power sold by the power consumer provided with the power storage unit from the information including the power amount b2 of the charging measured by the power storage unit power measurement unit. program. A power storage unit that is provided so as to be able to charge power from a commercial power system, and that discharges the stored power;
A power storage unit power measurement unit that measures the amount of power discharged from the power storage unit;
A power amount calculation unit that calculates power amount of power to be purchased by a power consumer provided with the power storage unit from information including the power amount of the power measured by the power storage unit power measurement unit. Power management system characterized by

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