JP2018169860A - Power supply system and electricity charge calculation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system and an electricity charge calculation device capable of realizing electric power business using a storage battery in a real society.SOLUTION: A power supply system 1 includes a storage battery 10 that charges and discharges electric power purchased by an electric power supplier and supplies electric power to a user, a measurement unit 12 that measures required electric energy, a database 13 that records data, and a calculation unit 14 that calculates an electricity charge based on the data recorded in the database 13. The calculation unit 14 sums a first expense being an expense that the electric power supplier purchases charging electric power during a target period and a second expense being an expense corresponding to the target period of an initial expense and calculates a cost in the target period; and thus, calculates an electricity charge in the target period higher as the cost in the target period and electric energy are larger respectively.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply system used for an electric power company that supplies and sells electric power to a consumer, and an electric power charge calculation device that calculates an electric power charge charged to the consumer in the electric power business performed by the electric power provider. .

  In recent years, the number of consumers who install storage batteries is increasing little by little for the purpose of storing surplus power generated by solar power generation devices, fuel cells, etc., or shifting the time zone for consuming power.

  If the storage battery spreads to many customers, the effective use of surplus power and the leveling of power consumption are promoted, so it is expected to improve various problems such as tight power supply and demand and environmental problems. However, due to the high price of storage batteries, it has not yet spread to many consumers.

  Therefore, Patent Literature 1 proposes a storage battery leasing system for promoting the spread of storage batteries. In this leasing system, a leasing company leases a storage battery purchased through its initial investment to a consumer and collects a part of profits obtained by the consumer using the storage battery.

  In this leasing system, the storage battery is controlled such that it is charged at night when the unit price of power supplied to the consumer by the power company is low, and is discharged during the day when the unit price of power supplied to the consumer by the power company is high. As a result, all of the amount of power consumed by the consumer during the day is covered by the amount of power discharged by the storage battery, and the power charge paid by the consumer to the power company is reduced. And a leasing company collects a part of the difference of the electric power charge (profit of a consumer) reduced by the consumer using the storage battery from the consumer as consideration for the lease of the storage battery.

In the lease system described in Patent Document 1, the amount of power consumed by the consumer is measured via the distribution board, and the consumer uses the storage battery by the calculation of the following formula using the amount of power. Calculate the difference between the reduced electricity charges.
Daytime unit price x Daytime power consumption = Electricity charge when not using storage battery (1)
Nighttime electricity unit price x Daytime power consumption = Electricity charge when using a storage battery (2)
(1)-(2) = Difference in power charges caused by consumers using storage batteries

JP 2014-197392 A

  Since the lease system proposed in Patent Document 1 cannot be established unless all of the amount of power consumed by consumers in the daytime is covered by the amount of power discharged by the storage battery, an expensive storage battery with a large capacity is indispensable. Furthermore, the amount of money that the leasing company can collect from the customer is limited to a part of the difference in the electricity charge reduced by the customer using the storage battery. For this reason, the leasing system proposed in Patent Document 1 requires a large amount of initial investment, but cannot recover even the initial investment unless it continues to collect consideration from customers over a long period of time. Therefore, with this leasing system, it is not expected that companies that should become leasing companies actively enter.

  On the other hand, in the leasing system proposed in Patent Document 1, if a leasing company leases a low-priced storage battery with a small capacity, only the amount of power that the storage battery discharges is consumed by the consumer during the day. There are cases where it is impossible to cover. In this case, since the electricity stored in the storage battery becomes 0 and cannot be discharged, the consumer is forced to consume the daytime power supplied by the power company at a high unit price. It will not be reduced. However, as shown in the above formula, the electricity charge (2) when the consumer uses a storage battery is calculated as the nighttime electricity unit price × daytime power consumption at a lower price than the actual daytime electricity charge. However, the power charge reduced by the use of the storage battery is calculated to be higher than actual, and the amount that the leasing company collects from the customer is higher than actual. Therefore, in the lease system proposed in Patent Document 1, the burden on the consumer can be unreasonably large, so that the consumer cannot be expected to actively use the lease system.

  As described above, in the lease system proposed in Patent Document 1, a leasing company intends to thoroughly realize the “assuming” that all energy consumed by consumers in the daytime is covered by the energy discharged from the storage battery. If the implementation of this “assum” is not thorough, the burden will be biased to consumers. Therefore, in this lease system, no matter how it is operated, the burden is biased on one of the parties, and participation of the party cannot be expected.

  As a cause of the occurrence of this problem, the “assuming” must be introduced in the lease system proposed in Patent Document 1. Specifically, in the leasing system proposed in Patent Document 1, the leasing company calculates the fee collected from the consumer in consideration of the power transaction situation between the power company and the consumer that the leasing company cannot grasp. “Assumptions” because all the amount of power consumed by consumers during the day is covered by the amount of power discharged by the storage battery, that is, the consumers are not supplied with power from the power company during the day. Must be introduced.

  Therefore, the present invention provides a power supply system and a power charge calculation device that can realize a power business using a storage battery in the real world.

  In order to achieve the above object, the present invention provides a power supply system used by an electric power company that supplies and sells electric power to a consumer, wherein the electric power company is at least one of a commercial power system and the consumer. A storage battery that charges and discharges the power purchased from the battery and supplies the consumer with power; an amount of charge power that is the power charged in the storage battery; and the power supplied to the consumer by the electric utility A measuring unit that measures the amount of electric power required to calculate each of the sales power, data obtained by measurement of the measuring unit, and unit price of charging power purchased by the electric power company And a database that records initial cost data that is the cost required for the installation of the storage battery, and the electric power company is in the unit period based on the data recorded in the database. And a calculation unit that calculates a power charge that is a price for the sold power supplied to a main house, and the calculation unit is configured to allow the electric power company to supply the commercial power system and the commercial power system during a target period that is one of the unit periods. A first cost that is a cost for purchasing the charging power from at least one of the consumers and a second cost that is equivalent to the target period of the initial cost distributed to at least one of the unit periods are added together. The power supply system is characterized in that the cost in the target period is calculated, and the power charge in the target period is calculated higher as the cost in the target period and the amount of electric power sold are larger. To do.

  According to this power supply system, the power charge is calculated based on the amount of electric power sold and the cost, which are actual values. As a result, without introducing the “assuming” like the lease system proposed in Patent Document 1, the electricity rate that reflects the amount and value of the sales power actually supplied to the consumer by the electric power company is calculated. be able to. For this reason, it is possible to calculate a power rate that is felt appropriate by both the electric utility and the consumer.

  Further, in the power supply system having the above characteristics, the storage battery charges and discharges surplus power, which is power that is generated by the consumer and is not consumed by the consumer, and supplies power to the consumer by discharging. Thus, the amount of power consumed by the consumer of the power of the commercial power system may be reduced.

  According to this power supply system, consumers consume preferentially surplus power that can be obtained by selling to an electric power company, and suppress consumption of power in a commercial power system that only pays the consideration. be able to.

  Further, in the power supply system having the above characteristics, the storage battery charges and discharges cheap power that is power of the commercial power system in a certain time zone, and supplies the consumer with the certain power time period. May reduce the amount of power consumed by the consumer who is the power of the commercial power system in a different time zone and has a higher unit price than the cheap power.

  According to this power supply system, the consumer can preferentially consume cheap power with a low unit price, and suppress consumption of expensive power with a high unit price.

  In the power supply system of the above feature, the calculation unit calculates a cost corresponding to the amount of power lost due to charging and discharging of the storage battery in the target period, and the larger the cost, the higher the cost in the target period. The power charge may be calculated high.

  Further, in the power supply system having the above characteristics, data of maintenance costs, which are costs necessary for maintaining the storage battery, are recorded in the database, and the arithmetic unit is a sum of the first cost and the second cost. In addition, the cost may be calculated by adding an amount equivalent to the target period of the maintenance cost.

  According to these power supply systems, it is possible to strictly calculate the amount and value of the sales power actually supplied to the consumer by the electric utility.

  Further, in the power supply system of the above feature, the database records the amount of remuneration acquired by the electric utility in response to a request to suppress power consumption of the commercial power system, and the calculation unit includes: It may be calculated by reducing the power rate according to the amount of remuneration acquired by the electric utility during the target period.

  Further, in the power supply system of the above feature, the storage battery performs peak cut control for discharging so that the amount of power per unit time of power purchased by the consumer from the commercial power system does not exceed a predetermined upper limit value. The database records data of compensation for the peak cut control, and the calculation unit calculates the power rate including the compensation for the peak cut control performed in the target period. Also good.

  According to these power supply systems, the profits enjoyed by the electric power company and the customer are distributed between the electric power company and the customer. For this reason, it is possible to calculate a power rate that is felt appropriate by both the electric utility and the consumer.

  Further, in the power supply system having the above characteristics, the electric power supplier supplies and sells the power purchased from the commercial power system to the consumer, and the database is connected to the electric power from the commercial power system. The amount of power required to calculate the amount of relay power that is power supplied to a business operator and is supplied to the consumer without being charged in the storage battery, and records the calculation unit However, the cost may be calculated by adding a third cost, which is the cost of the electric power supplier purchasing the relay power during the target period, to the total of the first cost and the second cost. .

  According to this power supply system, the electricity supplier is unified with the electricity supplier, and all purchase costs of electricity supplied by the electricity supplier to the consumer, including relay power, are reduced to cost. Be included. For this reason, it is possible to calculate power charges in a unified manner.

  Further, the present invention is a power rate calculation device used for an electric power company that supplies and sells electric power to consumers, the database and the data recorded in the database based on the data recorded in the unit period. A calculation unit that calculates a power charge that is a consideration for the power supplied by the electric power company to the consumer, and the electric power company purchases the electric power company from at least one of a commercial power system and the consumer. A storage battery that charges and discharges the power and supplies the consumer with power, and the database includes the amount of charge power that is the power charged in the storage battery, and the electric utility The amount of electric power sold and the amount of electric power required to calculate each of the electric power supplied to the consumer, the unit price data of the charging electric power purchased by the electric utility, and the storage Data of initial cost, which is a cost required for the installation of a pond, and the calculation unit is configured so that the electric power company can supply the commercial power system and the customer during a target period which is one of the unit periods. A first cost that is a cost for purchasing the charging power from at least one of the first cost and a second cost that is equivalent to the target period of the initial cost distributed to at least one of the unit periods. A power charge calculation apparatus is provided that calculates a cost in a period, and calculates the power charge in the target period higher as the cost and the sales power in the target period are larger.

  According to the power supply system and the electricity rate calculation device having the above characteristics, the sales power actually supplied to the consumer by the electric power company without introducing the “assum” like the lease system proposed in Patent Document 1. Therefore, it is possible to calculate a power rate that is considered appropriate by both the electric utility and the customer. Therefore, the electric power business carried out using the electric power supply system and the electricity bill calculation device can be realized in the real world because the participation of electric utilities and consumers is sufficiently expected.

The conceptual diagram shown about the electric power business with which the electric power supply system which concerns on embodiment of this invention can be utilized. The block diagram shown about the example of the whole structure of the electric power supply system which concerns on embodiment of this invention. The figure which showed typically the example of calculation of the electric power charge by the calculating part shown in FIG. The conceptual diagram shown about the electric power business of another form with which the electric power supply system which concerns on embodiment of this invention can be utilized.

<< Power business >>
Before describing a power supply system according to an embodiment of the present invention, a power business in which the power supply system can be used will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing a power business in which a power supply system according to an embodiment of the present invention can be used.

  As shown in FIG. 1, in an electric power business in which the power supply system according to the embodiment of the present invention can be used, an electric power company S that implements the electric power business, a consumer D, and a commercial power system G (for example, an old power system) Other electric utilities such as general electric utilities). Note that the consumer D is a consumer of electric power, and may be a facility that consumes a large amount of power such as a factory or an office, or a facility that consumes a small amount of power such as a general household. Good. The commercial power grid G is a power transmission / distribution network managed by, for example, a general power transmission / distribution company. The consumer D purchases the power of the commercial power system D (hereinafter referred to as “system power”) and consumes it or supplies it to the electric power company S.

  The electric power company S has a storage battery, purchases the electric power supplied from the consumer D, charges the storage battery, supplies the discharged electric power to the consumer D, and sells it. At this time, the electric power company S supplies electric power directly to the consumer D without going through the commercial power system G (without entrusting it). That is, virtually, the electric utility S operates a power business at the door of the consumer D.

  When the utility S purchases grid power from the consumer D and charges the storage battery 10, the utility S purchases grid power from the consumer D at the same unit price that the consumer D pays as compensation for grid power. In addition, the electric power company S is a case where the customer D has a power generation device, and the customer D generates power (hereinafter referred to as “surplus power”) that the customer D has not generated and consumed. When purchasing the battery and charging the storage battery 10, surplus power is purchased from the customer D at a predetermined unit price. For example, this unit price may be a fixed unit price determined by a contract between the electric power company S and the customer D, or a unit price that varies depending on the time zone (for example, a unit price when sold at a wholesale power exchange, Or a unit price determined on the basis of the unit price of the system power which varies depending on the time zone.

In this electric power business, since the electric power company S supplies electric power to the consumer D without going through the commercial power system G, the power company S manages the business power system G (for example, a general power transmission and distribution company). There is no need to pay a consignment fee. Therefore, the electric power company S can enjoy the profit without being reduced by the consignment, and it is possible to return a part of the profit to the customer D and attract the customer. Therefore, this electric business is expected to spread because both the electric utility S and the customer D can enjoy the profits. Social contribution such as effective use is expected.

  In addition, as shown in FIG. 1, in this electric power business, the electric power supplier S purchases the electric power sold by the consumer D, and the consumer D purchases the electric power sold by the electric operator S. There are two buying and selling. At this time, the charge of the first buying and selling and the charge of the second buying and selling may be settled individually between the electric utility S and the customer D. (The electric utility S charges the consumer D for the remaining charge obtained by subtracting the charge for the first sale from the charge for the second sale).

<< Power supply system >>
<Overall configuration>
An example of the overall configuration of a power supply system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing an example of the overall configuration of the power supply system according to the embodiment of the present invention. In FIG. 2, as in FIG. 1, the electric utility S, the customer D, and the commercial power system G are shown.

  Moreover, in FIG. 2, the case where the consumer D is provided with the solar power generation device 50 and generates electric power is illustrated. In addition to the solar power generation device 50, the consumer D converts the load 51, which is various devices that consume power, and the direct current power generated by the solar power generation device 50 into alternating current power to supply the load 51. And an inverter 52 for a solar power generation device. The load 51 consumes grid power and also consumes power generated by the solar power generation device 50. Further, surplus power that is generated by the solar power generation device 50 and not consumed by the load 51 is supplied from the consumer D to the electric utility S. Further, the power amount of the grid power purchased by the customer D is measured by the grid measuring unit 20. The system measurement unit 20 is a device that can measure the amount of power per unit time (for example, every 30 minutes) such as a smart meter, and is installed by a general power transmission and distribution company that manages the commercial power system G. . In FIG. 2, the system measurement unit 20 is illustrated as not included in the power supply system 1, but may be interpreted as included in the power supply system 1.

  As shown in FIG. 2, the power supply system 1 includes a storage battery 10, a storage battery inverter 11, a charge / discharge measurement unit 12 (corresponding to a “measurement unit”), a database 13, and a calculation unit 14.

  The storage battery 10 is configured by connecting at least one battery cell (single cell) that charges and discharges DC power such as a lithium ion battery, for example. In addition, the storage battery 10 measures various characteristics of the storage battery 10 (for example, individual battery cells or the entire voltage value, current value, internal resistance value, temperature, charged amount or state of charge (SOC)). In addition, a BMS (Battery Management System) 101 that charges and discharges the storage battery 10 according to the measurement result and the instruction given from the calculation unit 14 is provided.

  The storage battery 10 charges system power and surplus power. Moreover, the electric power discharged from the storage battery 10 is supplied from the electric utility S to the customer D.

  The charge / discharge measurement unit 12 is a device capable of measuring the amount of power per unit time (for example, every 30 minutes) such as a smart meter. The charge / discharge measurement unit 12 measures the amount of power charged by the storage battery 10 (hereinafter referred to as “charged power”) and the amount of power discharged (hereinafter referred to as “discharge power”).

  The database 13 is composed of a recording device capable of recording a large amount of data such as a hard disk. The database 13 includes data on the amount of power measured by the charge / discharge measurement unit 12 and the system measurement unit 20, data on the unit price of charging power, data on initial cost that is the cost required for installing the storage battery 10, and the like. Data necessary for calculation is also recorded.

  The calculation unit 14 includes, for example, a calculation device such as a CPU (Central Processing Unit) and a storage device such as a semiconductor memory. Based on the data recorded in the database 13, the calculation unit 14 calculates a power charge that is a consideration for the power supplied to the consumer D by the electric power company S during a unit period (for example, one month).

  The computing unit 14 determines the charging and discharging timings of the storage battery 10 based on the data recorded in the database 13 and gives instructions to the storage battery 10.

  For example, the computing unit 14 charges the storage battery 10 at a timing when surplus power is generated, and discharges the storage battery 10 at a timing when the amount of grid power consumed by the consumer D is reduced. Thereby, the consumer D can preferentially consume the surplus electric power which can be obtained by selling it to the electric power company S, and can suppress the consumption of the grid power which only pays the consideration.

  In addition, for example, the calculation unit 14 charges the stored value 10 at a timing when cheap power, which is system power in a time zone where the unit price is low such as nighttime, is charged, and is expensive which is system power in a time zone where the unit price is high such as daytime The storage battery 10 is discharged at a timing when the consumer consumes electric power. Thereby, the consumer D can preferentially consume cheap electricity with a low unit price, and can suppress consumption of expensive electricity with a high unit price.

  Moreover, the calculating part 14 is based on the data which the charging / discharging measurement part 12 and the system | strain measurement part 20 which are recorded on the database 13 measured, for every unit time (for example, 30 in the future specific day (prediction object day)). The amount of power (hereinafter referred to as “insufficient power”) and surplus power supplied to the consumer D from the commercial power system G and the electric power provider S is predicted every minute. Note that the amount of insufficient power in a unit time in the past is the amount of discharge power measured by the charge / discharge measurement unit 12 in the unit time relative to the amount of system power measured by the system measurement unit 20 in the unit time. It is the amount of power obtained by adding the amount of power and subtracting the amount of charge power. The surplus power in a unit time in the past is the amount of charge power measured by the charge / discharge measurement unit 12 in the unit time.

  For example, the calculation unit 14 calculates the amount of power purchased by the customer D and surplus power on a plurality of past days in which the prediction target date and conditions (for example, season, weather, date, day of the week, etc.) are approximate. The power amount of each of the insufficient power and surplus power on the prediction target date is predicted by a method such as averaging for each time period. As shown in FIG. 2, when the customer D includes the photovoltaic power generation device 50, the amount of power generation varies greatly depending on the weather (particularly the amount of sunlight), so the above conditions include the weather. Is preferable. In this case, it is preferable that the database 13 records, for example, weather data on a past day and weather forecast data on a prediction target date acquired via a network such as the Internet.

  And the calculation part 14 is the storage battery 10 in a prediction target day so that the economical burden of the consumer D may become the minimum, when it assumes that the electric power of the shortage electric power and the surplus electric power as predicted on the prediction target day occurs. Develop a plan for charging and discharging. For example, a plan for charging and discharging the storage battery 10 is formulated so that the price of the grid power purchased by the customer D is the cheapest on the prediction target date. Further, for example, on the prediction target date, the customer D adds the fee of the power purchased by the consumer D from the electric utility S to the price of the grid power purchased by the consumer D, and the consumer D sells it to the electric utility S. A plan for charging and discharging the storage battery 10 is formulated so that the total amount obtained by subtracting the charge of power (that is, the balance of the customer D on the prediction target date) is the cheapest.

  At this time, for example, the calculation unit 14 may not be able to charge the storage battery 10 because the storage battery 10 is fully charged in the time zone in which surplus power is supplied, or the amount of power stored in the storage battery 10 before the time zone in which higher power is supplied. A plan that takes into account the capacity of the storage battery 10 and the amount of stored electricity is formulated so that the situation where the battery becomes zero and the discharge cannot be performed is avoided as much as possible.

  Specifically, for example, when it is predicted that a large amount of surplus power will be generated in a certain time zone, the calculation unit 14 only discharges the storage battery 10 in a time zone in which the premium power is supplied before the time zone. In addition, a plan for discharging the storage battery 10 is formulated so that the storage battery 10 is discharged even during a time period in which bargain power is supplied as necessary. In addition, for example, when it is predicted that a large amount of power needs to be supplied from the electric power company S to the consumer D in a time zone in which high-priced power is supplied, the calculation unit 14 is prior to the time zone. Develop a plan for charging the storage battery 10 so that the storage battery 10 is charged not only in the time zone in which surplus power is supplied, but also in the time zone in which cheap power is supplied as necessary. .

  Further, depending on the contract contents between the consumer D and another electric power supplier that supplies power via the commercial power grid G, every predetermined unit time of the grid power supplied to the consumer D (for example, every 30 minutes) As the demand value, which is the maximum value of the power amount in (), increases, the price of the grid power increases and the economic burden on the customer D increases. Accordingly, the calculation unit 14 controls charging and discharging of the storage battery 10 (that is, performing peak cut control) so that the amount of power per unit time supplied to the consumer D does not exceed a predetermined upper limit value, for example. You may do it. Furthermore, the calculating part 14 may calculate the electric power charge including the consideration with respect to this peak cut control. In this case, the database 13 may record data for compensation for the peak cut control, and the calculation unit 14 may calculate the power rate with reference to the data.

  For the sake of illustration and explanation, FIG. 2 illustrates the database 13 and the calculation unit 14 (corresponding to the “electricity charge calculation device”) as if they are installed near the customer D. May be installed in a place away from the consumer D (for example, an office of the electric power company S). Further, in FIG. 2, the database 13 and the calculation unit 14 are illustrated as having a one-to-one correspondence with the customer D and the storage battery 10, but for a plurality of sets of the customer D and the storage battery 10. The database 13 and the calculation unit 14 may be configured to correspond to each other. However, in this case, the charge / discharge measurement unit 12 and the system measurement unit 20 transmit data obtained by measurement to the database 13, and the database 13 receives and records the data. Moreover, the calculating part 14 transmits the instruction | indication of charge and discharge with respect to the storage battery 10, and the storage battery 10 will receive the said instruction | indication, and will perform charge and discharge.

  Moreover, in FIG. 2, although the data obtained by the measurement of the charging / discharging measurement part 12 and the system | strain measurement part 20 are shown as input directly with respect to the database 13, these data are finally shown. As long as it is input and recorded in the database 13, any data path may be used. For example, the data obtained by the measurement of the system measurement unit 20 is transmitted and recorded in the database of the general power transmission and distribution company because the system measurement unit 20 is managed by the general power transmission and distribution company. Then, the data may be automatically transmitted to the database 13 and recorded thereafter (or in response to a transmission request from the electric utility S).

  Moreover, in FIG. 2, although the case where the consumer D is provided with the solar power generation device 50 is illustrated, the consumer D is not the solar power generation device 50 but another type of power generation device (for example, a fuel cell). It may be provided, and may be provided with a plurality of kinds of power generators. Moreover, the consumer D may have its own storage battery. In the above description, the system power has been exemplified for the case where the system power is two types (expensive power, cheap power) with different unit prices depending on the time zone, but may be three or more types.

<Calculation method of electricity charges>
Next, the calculation method of the electric power charge by the calculating part 14 is demonstrated with reference to drawings. FIG. 3 is a diagram schematically illustrating an example of calculation of power charges by the calculation unit illustrated in FIG. FIG. 3 shows a total of four calculation examples, two in each of (a) and (b). In FIG. 3, the electric power sold is the electric power supplied by the electric power company S to the consumer D, and the cost is the cost borne by the electric power company S for supplying the electric power to the consumer D.

  As illustrated in FIG. 3, the calculation unit 14 calculates a power charge based on the amount of electric power sold in the target period, which is a unit period for which the power charge is calculated, and the cost in the target period. Specifically, the calculation unit 14 calculates a higher power charge in the target period as the amount of electric power sold and the cost are larger.

  For example, the calculation unit 14 sets the unit price of sold power so as to increase as the cost increases, and calculates the power rate by multiplying the unit price by the amount of power of sold power. In addition, for example, the calculation unit 14 calculates a provisional power charge using a pay-as-you-go calculation formula that increases as the amount of electric power sold in the target period increases, and calculates the size of the cost (absolutely large) in the target period. The final electricity rate is calculated by making adjustments to increase or decrease the provisional electricity rate according to the relative size such as the ratio to the provisional electricity rate. To do.

  FIG. 3A shows a comparison between two cases where the amount of electric power sold is the same and the cost is different. The cost of the first case is lower than that of the second case. For example, since the total amount of power purchased from the consumer D by the electric power company S is lower than that in the second case, the first case has a lower cost while the amount of power sold is the same. . In this case, the calculation unit 14 calculates the power rate so that the first case is cheaper than the second case.

  FIG. 3B shows a comparison of two cases where the cost is the same and the sales power is different. The power consumption of the sales power is smaller in the third case than in the fourth case. ing. For example, in the third case, since the average unit price of the power purchased from the consumer D by the electric power company S is lower than that in the fourth case, the sales power is large while maintaining the same cost. In this case, the calculation unit 14 calculates the power rate so that the third case is higher than the fourth case.

  The above-described cost may include a first cost that is a purchase cost of charging power in the target period and a second cost that is equivalent to the target period of the initial cost. The initial cost is a cost required for the installation of the storage battery 10 and may include not only the cost of the main body of the storage battery 10 but also the cost of the construction for installing the storage battery 10. The initial period corresponding to the target period is, for example, an equivalent of the target period when the initial cost is distributed to at least one unit period by a method similar to depreciation.

  The computing unit 14 calculates the cost in the target period by adding the first cost and the second cost. At this time, the calculation unit 14 measures the data of the measurement results of the charge / discharge measurement unit 12 and the system measurement unit 20 recorded in the database 13 and the unit price of the charging power purchased by the electric utility S recorded in the database 13. Based on the data, the first cost is calculated.

  For example, for each of a plurality of time zones (for example, every 30 minutes) included in the target period, the calculation unit 14 multiplies the amount of charging power by the unit price, and further adds the multiplication results to obtain the first cost. Is calculated. At this time, the calculation unit 14 is measured by the charge / discharge measurement unit 12 when the power amount of the system power charged to the storage value 10 (for example, the power amount of the system power measured by the system measurement unit 20 is greater than 0). When the power amount of the grid power is multiplied by the unit price of the grid power and the power amount of the surplus power charged to the stored value 10 (for example, the grid power amount measured by the grid measurement unit 20 is 0) The amount of charging power measured by the charge / discharge measuring unit 12 is multiplied by the unit price of surplus power.

  The unit price of the surplus power may be, for example, a fixed price determined by a contract between the electric power company S and the customer D, or a variable price based on the unit price of the grid power that varies depending on the time zone (for example, the relevant price) It may be the same price as the unit price, or a price calculated by multiplying the unit price by a predetermined ratio), or a variable price based on the unit price when sold at a wholesale power exchange (for example, the unit price) Or a price calculated by multiplying the unit price by a predetermined ratio). However, when the unit price required for the calculation unit 14 to acquire or calculate the unit price of surplus power is updated at any time, such as when the unit price when sold at the wholesale power exchange is used as a reference, It is assumed that the data is collected at any time via a network such as the Internet and recorded in the database 13.

  As described above, in the power supply system 1, the power charge is calculated based on the amount of electric power sold and the cost, which are actual values. As a result, the electric power reflecting the amount and value of the electric power actually supplied to the consumer D by the electric power company S without introducing the “assum” like the lease system proposed in Patent Document 1 described above. Charges can be calculated. For this reason, it is possible to calculate a power rate that is felt appropriate by both the electric power company S and the customer D. And since the above-mentioned electric power business performed using this electric power supply system 1 (electricity charge calculation apparatuses 13 and 14) is fully expected participation of the electric power company S and the consumer D, it is realizable in the real world. It is.

  Note that a reasonable power charge can be calculated if the cost calculated by the calculation unit 14 includes at least the total of the first cost and the second cost, but the cost may be calculated more strictly.

  For example, the cost corresponding to the target period of the maintenance cost, which is the cost necessary for maintaining the storage battery 10, such as the cost required for the inspection and repair of the storage battery 10, may be included. The maintenance period equivalent period may be a cost (actual cost) actually required for the storage battery 10 installed for the customer D, or a contract with the electric power company S. The cost may be a cost obtained by averaging costs actually required by the entire customer, or may be a fixed cost determined based on the past history of the customer D or the entire customer.

  Further, for example, since the storage battery 10 has a smaller amount of discharge power than the amount of charge power (there is a loss of power), the calculation unit 14 calculates a cost corresponding to the lost power amount, and the cost The larger the is, the higher the power charge in the target period may be calculated. For example, the calculation unit 14 multiplies the first cost calculated based on the charging power in the target period as described above by a loss ratio smaller than 1, thereby charging and discharging the storage value 10. A cost corresponding to the amount of power lost may be calculated.

<< Deformation, etc. >>
[1] When the electric power company S receives a reward in response to a demand response request (a request to reduce the amount of grid power consumed when the supply and demand of the commercial power grid G is tight), the computing unit 14 You may calculate the electric power charge reduced according to the amount of the said reward. Thereby, profits can be distributed between the electric power company S and the customer D, including a demand response reward that is a reward acquired by the electric power company S other than the relationship with the consumer D.

  For example, in this case, when the calculation unit 14 detects that a demand response has been requested, the storage unit 10 is discharged in the time zone subject to the demand response, thereby reducing the amount of grid power consumed by the customer D. Reduce. Further, the database 13 records data on the amount of reward received by the electric power company S in response to a demand response request. This data may be input from the outside, or may be calculated and generated by the calculation unit 14 based on data recorded in the database 13.

  Further, for example, not only the electric utility S but also the consumer D may be notified of the demand response so that the amount of grid power can be reduced by the power saving behavior of the consumer D. In this case, since the power saving action of the consumer D can be promoted, it becomes possible to effectively eliminate the tight supply and demand of the commercial power system G.

  Further, in the above-described embodiment, the case where sales by the supply of electric power (reverse power flow) from the electric power company S to the commercial power system G is not illustrated, but it is configured so that the reverse power flow can be performed. Also good. In this case, it is preferable that the electric power company S calculates the electric power charge reduced according to the amount of the reward obtained by the electric power company S due to the reverse power flow, similarly to the demand response reward.

[2] In the above-described embodiment, the case where the customer D has the power generation device (solar power generation device 50) is illustrated, but the customer D may not have the power generation device. However, even in this case, if the unit price of the grid power is different depending on the time zone (the above-mentioned premium power and cheap power are contracts supplied from the commercial power grid G to the consumer D), Similarly to the embodiment, the storage battery 10 can be charged and discharged. On the other hand, even if the unit price of the grid power is constant, if the customer D has a power generation device, the storage battery 10 can be charged and discharged as in the above-described embodiment. it can.

  Moreover, in the above-mentioned embodiment, although illustrated about the case where the electric power company S charges only the electric power supplied from the consumer D, the electric power company S uses a power generation device (for example, a solar power generation device or a fuel cell). The storage battery 10 may be charged with the electric power generated and generated by the power generation device, or the electric utility S may purchase the grid power without going through the consumer D and charge the storage battery 10.

[3] In the above-described embodiment, the case where the storage battery 10 performs charging and discharging based on the instruction given from the calculation unit 14 is illustrated, but the instruction may not be given from the calculation unit 14 to the storage battery 10. . In this case, for example, the storage battery 10 (or BMS 101) includes a simple control device programmed with a predetermined charge / discharge policy, and the storage value 10 autonomously charges and discharges according to the control of the control device. Also good.

  Specifically, for example, when the surplus power of the customer D is supplied to the electric power company S, the storage battery 10 may be configured to charge the surplus power as much as possible. Further, in a predetermined time zone such as midnight (a time zone where the unit price of the grid power is low, a time zone where the amount of insufficient power reported by the customer D is small, etc.) as much as possible with a predetermined amount of power. The storage battery 10 may be configured to be charged. In addition, it is possible with a predetermined amount of power in a predetermined time period such as during the daytime (for example, a time period when the unit price of system power is high or a time period when the amount of insufficient power reported by the customer D is large). The storage battery 10 may be configured to discharge as much as possible.

[4] Although FIG. 2 illustrates the case where the power supply system 1 includes the charge / discharge measurement unit 12 and the system measurement unit 20, at least the power required for the calculation unit 14 to calculate the power rate ( As long as it is possible to calculate the amount of electric power (charging electric power and sales electric power), the electric energy at any position in the commercial electric power system G, the consumer D, and the electric utility S may be measured.

[5] In FIG. 2, the case where the storage battery 10 and the customer D correspond one-to-one is illustrated, but a plurality of customers D may correspond to one storage battery 10. . That is, you may comprise so that the electric power which one storage battery 10 charged with the electric power supplied from the some consumer D may be supplied to the several consumer D while the one storage battery 10 discharged. In this case, one charging / discharging measuring unit 12 is provided for each customer D, and the charging / discharging measuring unit 12 measures the surplus power and the amount of electric power sold for each customer D. Then, it is preferable. In this case, the initial cost and the second cost may also include a cost required for installation of wiring, cubicle, and the like necessary for exchanging electric power with the plurality of consumers D.

[6] In the above-described embodiment, the case where the power supply system 1 is used in the power business in which the customer D purchases the grid power from the commercial power grid G (for example, an old general electric utility) is illustrated. However, the power supply system 1 can be used for another type of power business. Here, an example of another power business that can be used by the power supply system 1 will be described with reference to the drawings. FIG. 4 is a conceptual diagram showing another form of power business in which the power supply system according to the embodiment of the present invention can be used.

  The electric utility shown in FIG. 4 is one in which the electric utility S once purchases the electric power supplied from the commercial electric power grid G and then sells it to the consumer D. In this electric power business, the customer D can be unified with the electric power company S as a partner to receive power supply.

  When performing this power business, the calculation unit 14 is power that is supplied from the commercial power system G to the electric power company S and is supplied to the consumer D without being charged in the storage battery 10 (hereinafter referred to as “relay power”). The cost of purchasing relay power by the electric power company S (hereinafter referred to as “third cost”) is calculated by multiplying the power amount of “ Here, the power amount of the relay power is a power amount obtained by subtracting the power amount of the charging power measured by the charge / discharge measuring unit 12 from the power amount measured by the system measuring unit 20. In addition, the calculation unit 14 may calculate the third cost calculated separately from the power charge in the above embodiment and charge the customer D, but the third cost is added to the cost in the above embodiment. At the same time, if the power charge is calculated after including the power amount of the relay power in the power amount of the sales power, the power charge can be calculated in a unified manner.

  The present invention relates to a power supply system used for an electric power company that supplies and sells electric power to a consumer, and an electric power charge calculation device that calculates an electric power charge charged to the consumer in the electric power business performed by the electric power company. Is available.

1: Power supply system 10: Storage battery 101: BMS
DESCRIPTION OF SYMBOLS 11: Inverter for storage batteries 12: Charging / discharging measurement part 13: Database 14: Calculation part 20: System | strain measurement part 50: Solar power generation device 51: Inverter for solar power generation device 52: Load S: Electric power supplier D: Customer G : Commercial power system

Claims (9)

A power supply system used by an electric power company that supplies and sells electricity to consumers,
A storage battery that charges and purchases power purchased from at least one of a commercial power system and the consumer by the electric utility and supplies the consumer with power; and
Measure the amount of power required to calculate each of the amount of charged power that is the power charged in the storage battery and the amount of sold power that is the power supplied to the consumer by the electric utility. A measuring unit to perform,
A database that records data obtained by measurement of the measurement unit, data of unit price of charging power purchased by the electric utility, and data of initial cost that is a cost required for installing the storage battery,
Based on the data recorded in the database, a calculation unit that calculates a power rate that is the price of the sales power supplied to the consumer by the electric utility in a unit period, and
The calculation unit includes a first cost that is a cost for the electric power supplier to purchase the charging power from at least one of the commercial power system and the consumer in a target period that is one of the unit periods, and at least one And calculating the cost in the target period by adding the second cost corresponding to the target period of the initial cost distributed in the unit period, and calculating the cost of the target period and the amount of electric power of the sales power The power supply system characterized in that the larger the size of each, the higher the power charge in the target period is calculated.   The storage battery is charged with surplus power that is generated by the consumer and not consumed by the consumer, and is discharged to supply power to the consumer. The power supply system according to claim 1, wherein the amount of power consumed by a consumer is reduced.   The commercial battery in a time zone that is different from the certain time zone by charging the bargain power, which is the power of the commercial power grid in a certain time zone, and supplying the power to the consumer by the storage battery. 3. The power supply system according to claim 1, wherein the amount of power consumed by the consumer who has a higher power and a higher unit price than the cheap power is reduced. 4.   The calculation unit calculates a cost corresponding to the amount of power lost due to charging and discharging of the storage battery in the target period, and the higher the cost, the higher the power charge in the target period is calculated. The power supply system according to any one of claims 1 to 3. In the database, maintenance cost data which is a cost necessary for maintaining the storage battery is recorded,
5. The calculation unit according to claim 1, wherein the calculation unit calculates the cost by adding an amount equivalent to the target period of the maintenance cost to the total of the first cost and the second cost. The power supply system according to claim 1. The database records the amount of remuneration acquired by the electric power company in response to a request to suppress power consumption of the commercial power grid,
6. The calculation unit according to claim 1, wherein the calculation unit calculates the power rate by reducing the amount of power according to the amount of reward acquired by the electric power company during the target period. Power supply system. The storage battery performs peak cut control for discharging so that the amount of power per unit time of power purchased by the consumer from the commercial power system does not exceed a predetermined upper limit value,
The database records compensation data for the peak cut control,
The power supply system according to claim 1, wherein the calculation unit calculates the power charge including a consideration for the peak cut control performed in the target period. In the case where the electric utility supplies and sells the power purchased from the commercial power grid to the consumer,
Necessary for calculating the amount of relay power that is the power supplied from the commercial power system to the electric utility and supplied to the consumer without charging the storage battery. Records the amount of power,
The calculation unit calculates the cost by adding a third cost, which is a cost for the electric power supplier to purchase the relay power, to the total of the first cost and the second cost. The power supply system according to any one of claims 1 to 7. A power rate calculation device used by an electric power company that supplies and sells electricity to consumers,
A database,
A calculation unit that calculates a power charge that is a consideration for the power supplied to the consumer by the electric power company in a unit period based on the data recorded in the database;
The electric power company has a storage battery that supplies electric power to the consumer by charging and discharging the electric power purchased by the electric power company from at least one of a commercial power system and the consumer,
The database is necessary for calculating each of the amount of charged power that is the power charged in the storage battery and the amount of sold power that is the power supplied to the consumer by the electric utility. Data on the amount of power, data on the unit price of charging power purchased by the electric power company, and data on initial cost, which is the cost required to install the storage battery, are recorded,
The calculation unit includes a first cost that is a cost for the electric power supplier to purchase the charging power from at least one of the commercial power system and the consumer in a target period that is one of the unit periods, and at least one The cost for the target period is calculated by adding the second cost corresponding to the target period of the initial cost distributed in the unit period, and each of the cost and the sales power in the target period is large. The power charge calculation apparatus is characterized in that the power charge for the target period is calculated higher.

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