JP2018097802A - Electric power charging system, electric power storage system, auxiliary system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system capable of motivating a user of electric power to alleviate the demand for electric power (incoming power), an electric power supplier (for example, power retailer) to alleviate entire demand for electric power.SOLUTION: The electric power charging system includes: incoming power acquisition means; power charge determination means; and billing amount determination means. The power charge determination means determines the power fee so that the fee gets higher with respect to an incoming power value with larger deviation from a target value or a larger fluctuation in the incoming power value within a predetermined time.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a power billing system, a power storage system, and an auxiliary system.

  In recent years, against the background of international frameworks such as the regulation of global warming gas emissions, as an alternative to thermal power generation using fossil fuels such as coal or oil, carbon dioxide low emission power sources such as nuclear power generation or renewable energy There is a need for technology to increase the ratio. A variably renewable energy power generation system such as solar power generation or wind power generation is large-scale and about tens of MW has been put into practical use. Although these are excellent in dispersive installation properties, there are problems such as a large area occupied at the time of large scale, so a method of increasing the ratio of nuclear power generation is also conceivable for large-scale greenhouse gas reduction.

  However, in principle, nuclear power generation in Japan is operated to maintain a constant output without changing the output. Due to this restriction, the amount of nuclear power generation is limited to the lower limit of power demand fluctuations throughout the four seasons, and if there is a need to further improve the ratio of nuclear power generation, it is necessary to level out power demand fluctuations. It becomes.

  In the past, in order to stimulate the nighttime electricity demand in the domestic electricity business, measures such as setting a nighttime electricity unit price when using an electric water heater or the like have been used. Patent Document 1 discloses a technique related to leveling of power demand (received power) using a storage battery.

JP 2016-15857 A

  The technology described in Patent Document 1 uses a billing model that uses a contract fee based on the power reception capacity and a power charge based on the amount of electricity used, and reduces the power reception capacity by reducing the demand peak and This is a method to reduce the contract fee. Although this method contributes to the reduction of peak demand, fluctuations in power demand (received power) always occur outside peak hours, so there is a possibility that sufficient power leveling performance cannot be obtained. This method is based on a model where both the contract fee and the electricity charge are paid by the person who uses more power, and the motivation for consumers to further level out fluctuations in power demand. Was not enough.

  The present invention can provide motivation to further level power demand (received power) to power consumers and level the overall power demand for power suppliers (for example, power retailers). The purpose is to provide a system.

  The power billing system of the present invention includes a received power value acquisition unit that acquires a received power value of a power consumer every first predetermined time, and a received power value of the power consumer based on the received power value acquired by the received power value acquisition unit. The power demand is determined by integrating the power reception fee determined by the power reception fee determination means for each second predetermined time equal to or longer than the first predetermined time, and the power reception fee determined by the power reception fee determination means over a predetermined period. Charge amount determination means for determining the charge amount for the house, and the power reception fee determination means increases the deviation of the received power value from the target received power or the variation amount of the received power value in the second predetermined time. The power reception fee is determined so as to increase the power reception fee.

  In this power billing system, the power reception fee is determined such that the power reception fee increases as the deviation of the power reception value from the target power reception or the amount of fluctuation of the power reception value in the second predetermined time increases. Therefore, the motivation to further level the power demand (received power) can be given to the power consumer. In addition, since a power supplier (for example, a power retailer) who charges with the power billing system of the present invention can take in many power consumers who have sufficiently leveled the power demand (received power), the power supply It is possible to equalize the overall power demand for a person (for example, a power retailer).

  In the power billing system of the present invention, the received charge determining means is a means for determining the received charge so that the received charge is higher as the deviation of the received received power value from the target received power is larger. You may have the target received power setting means to set target received power. According to this, it becomes possible to set the target received power of the received power value as appropriate according to the situation of the power consumer.

  In the power billing system of the present invention, the received charge determining means is a means for determining the received charge so that the received charge is higher as the deviation of the received received power value from the target received power is larger. The rate of increase in power reception fee with respect to the increase in deviation may be changed according to the target power reception. According to this, the charging system can be changed according to the difference in the received power capacity.

  In the power billing system of the present invention, the received power charge determining means is a means for determining the received power charge so that the received power charge becomes higher as the fluctuation amount of the received power value in the second predetermined time is larger. In addition, the average value of the received power value in the second predetermined time from when the previous power reception fee is determined until the current power reception fee is determined, and the maximum value of the deviation between the average value and each received power value is obtained. The variation amount of the received power value during the second predetermined time may be the maximum value of the deviation. This can also provide motivation to further level the power demand (received power) to the power consumer. It is also possible to level the overall power demand for power suppliers (for example, power retailers).

  In the power billing system of the present invention, the received power charge determining means is a means for determining the received power charge so that the received power charge becomes higher as the fluctuation amount of the received power value in the second predetermined time is larger. And a cumulative change amount calculation means for obtaining a cumulative value of a change amount between the received power values acquired before and after the second predetermined time from the determination of the previous power reception fee to the determination of the current power reception fee. The variation amount of the received power value in the second predetermined time may be a cumulative value of the variation amount. This can also provide motivation to further level the power demand (received power) to the power consumer. It is also possible to level the overall power demand for power suppliers (for example, power retailers).

  One of the power storage systems of the present invention is a power storage system installed in a power consumer who is charged by any of the power billing systems described above, and is connected to a connection part between the power system and the load of the power consumer. A grid-connected inverter that converts AC power and DC power bidirectionally, a storage battery, and a DC-side voltage section and a storage-cell-side voltage section that are connected between the grid-connected inverter and the storage battery. And a bidirectional DC / DC converter that bidirectionally converts power between the storage battery and the storage battery can be charged from the power system via a grid-connected inverter and a bidirectional DC / DC converter, The load can be discharged to the load via the bidirectional DC / DC converter and the grid-connected inverter, and the grid-connected inverter ensures that the received power received by the power consumer matches a predetermined power target. It is your, bidirectional DC / DC converter is a DC voltage at the connection of the bidirectional DC / DC converter and the system interconnection inverter is controlled to have a substantially constant value, a power storage system.

  In this power storage system, the grid-connected inverter is controlled such that the received power received by the power consumer matches a predetermined power target, so that the power demand (received power) of the power consumer can be leveled. This makes it easier for power consumers to enjoy the benefits of the billing system according to any of the power billing systems described above. For this reason, the number of power consumers who have leveled the power demand (received power) has increased, and power suppliers (for example, power retailers) who charge by the above-mentioned power billing system level the power demand (received power). It is possible to take in a large number of converted electric power consumers, and it is possible to equalize the overall electric power demand for electric power suppliers (for example, electric power retailers).

  Another power storage system according to the present invention is a power storage system installed in a power consumer who is charged by any of the power billing systems described above, and is connected to a power system and converts AC power into DC power. An AC / DC converter, a storage battery, and a bidirectional DC / DC connected between the AC / DC converter and the storage battery and bi-directionally converting power between a DC side voltage and a storage battery side voltage of the AC / DC converter. A DC converter, a DC / AC inverter that is connected between a connection portion of the AC / DC converter and the bidirectional DC / DC converter and a load of an electric power consumer, and that converts DC power and AC power bidirectionally; The storage battery can be charged from the power system via an AC / DC converter and a bidirectional DC / DC converter, and the storage battery is a bidirectional DC / DC converter and a DC / A The load can be discharged to the load through the inverter, the AC / DC converter is controlled so that the received power received by the power consumer matches a predetermined power target, and the bidirectional DC / DC converter is bidirectional DC / DC. The DC / AC inverter is a power storage system in which the DC voltage at the connection between the converter and the AC / DC converter is controlled to be a constant value, and the AC voltage on the load side is controlled to be a predetermined AC voltage.

  In this power storage system, the AC / DC converter is controlled so that the received power received by the power consumer matches a predetermined power target, so that the power demand (received power) of the power consumer can be leveled. This makes it easier for power consumers to enjoy the benefits of the billing system according to any of the power billing systems described above. For this reason, the number of power consumers who have leveled the power demand (received power) has increased, and power suppliers (for example, power retailers) who charge by the above-mentioned power billing system level the power demand (received power). It is possible to take in a large number of converted electric power consumers, and it is possible to equalize the overall electric power demand for electric power suppliers (for example, electric power retailers). Furthermore, since the AC / DC converter is used instead of the interconnection inverter in one of the above-described power storage systems, the cost of the power storage system can be reduced.

  In another power storage system of the present invention, the AC / DC converter may be controlled so that the input power of the AC / DC converter matches a predetermined power target. According to this, since a power control point can be provided inside the power storage system, installation of the power storage system is facilitated.

  In another power storage system of the present invention, the capacity of the AC / DC converter may be smaller than the capacity of the bidirectional DC / DC converter and the DC / AC inverter. According to this, while being able to reduce the cost of an AC / DC converter (electric storage system), the capacity | capacitance and cost of power receiving equipment, such as a breaker capacity | capacitance of the distribution panel of an electric power consumer, a transformer, can also be reduced.

  The auxiliary system of the present invention is an auxiliary system that assists in properly maintaining the remaining charge of the storage battery in any of the above-described power storage systems, and a remaining charge acquisition means for acquiring the remaining charge of the storage battery; Predictive means for excess or shortage of remaining charge foreseeing shortage and excess of remaining charge of storage battery based on remaining charge amount, and electric vehicle if shortage of remaining charge is predicted by means of predicting excess or shortage of remaining charge Discharge request information requesting discharge from the battery to the storage battery is notified to the driver or owner of the electric vehicle. An auxiliary system comprising: request notification means for notifying a driver or owner of an electric vehicle of charging request information for requesting charging.

  In this auxiliary system, when the excess or deficiency of the remaining amount of charge of the storage battery in any of the above-described storage systems is predicted, the excess or deficiency can be reduced using the storage capacity of the electric vehicle. The range in which any of the systems can level the power demand (received power) of the power consumer can be expanded.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to give the motivation which wants to further level | ify the electric power demand (received electric power) with respect to an electric power consumer, it equalizes the whole electric power demand with respect to an electric power supplier (for example, electric power retailer). Can be provided.

1 is a diagram illustrating an overall configuration of a power system including a power billing system, a power storage system, and an auxiliary system according to a first embodiment of the present invention. It is a figure which shows the detail of the electrical storage system which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the electric power billing system which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the charge model which the electric power charging system which concerns on 1st Embodiment of this invention applies with respect to an electric power consumer. It is a figure which shows the other example of the charging model which the electric power charging system which concerns on 1st Embodiment of this invention applies with respect to an electric power consumer. It is a figure explaining the time-dependent change of a receiving fee when the charging model shown in FIG. 4 is applied. It is a figure which shows the structure of the electric power billing system which concerns on 2nd Embodiment of this invention. It is a figure which shows an example of the charge model which the electric power charging system which concerns on 2nd Embodiment of this invention applies with respect to an electric power consumer. It is a figure explaining the time-dependent change of a receiving fee when the charging model shown in FIG. 8 is applied. It is a figure which shows the structure of the electric power billing system which concerns on 3rd Embodiment of this invention. It is a figure which shows an example of the charging model with which the electric power charging system which concerns on 3rd Embodiment of this invention applies with respect to an electric power consumer. It is a figure explaining the time-dependent change of a receiving fee when the charging model shown in FIG. 11 is applied. It is a figure which shows the whole electric power system containing the electric power billing system which concerns on 4th Embodiment of this invention, an electrical storage system, and an auxiliary | assistant system. It is a figure which shows the detail of the electrical storage system which concerns on 4th Embodiment of this invention. It is a figure which shows the structure of the auxiliary system which concerns on 5th Embodiment of this invention. It is a figure explaining operation | movement of the auxiliary | assistant system shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

[Power System (First Embodiment)]
FIG. 1 is a diagram showing an entire power system 1000 including a power billing system 40, a power storage system 2A, and an auxiliary system 44 according to the first embodiment of the present invention. Reference numerals 1a and 1b represent power generation companies. These include, for example, nuclear power generation facilities that use uranium fuel as the primary primary energy source, and geothermal power generation facilities that generate electricity using steam obtained from boiler engines using geothermal heat contained in groundwater in volcanic areas as the primary energy source. For example, a power generation company that operates a low-carbon dioxide emission type that does not use fossil fuels and a constant output type power supply system that does not fluctuate its output. The power generation companies 1a and 1b generate AC power using the primary energy source, and supply the generated power to the power system 10d.

  A power consumer 1c is connected to the power grid 10d and receives power from the power grid 10d. Power grids 10a, 10b, and 10c are provided at interconnection points where the power generation facilities of the power generation companies 1a and 1b and the power consumer 1c are connected to the power grid 10d, and the power passing through each grid point is measured. The Here, as the power meters 10a, 10b, and 10c, for example, smart meters managed by a power company may be used. The power data detected by the wattmeters 10a, 10b, and 10c is collected by the collection and distribution system 10e through the communication network.

  The power consumer 1c includes a distribution board 3, a power storage system 2A, a normal load 6, and a charger 7 provided at a demand point corresponding to the downstream of the wattmeter 10c. On the power receiving line connecting the power meter 10c and the distribution board 3, power receiving current detecting means 5 for measuring current is provided, and the information on the measured power receiving current is configured to be detectable by the power storage system 2A. Here, a current transformer or a Hall element may be used as the received current detection means 5.

The electric power consumer 1c is provided with an overall controller 9, and the overall controller 9 is configured to be capable of mutual communication with each of the power storage system 2A, the normal load 6, and the charger 7. Here, as the functions of the overall controller 9, for example, the function of collecting the power consumed by each connected device or the operating status of the charger 7, the function of predicting the future operating trend and the consumption pattern of the power consumer 1c by analyzing the collected data A function for calculating the electricity bill or CO2 emission amount of the power consumer 1c from the power data of each connected device, a function for optimizing the operation plan of each connected device that minimizes the objective function such as the electricity bill or CO2 emission amount, Etc. may be provided.

  In the domestic power system, the retailer 4 generally supplies the received power excluding the contribution of private power generation from the power demand of the power consumer 1c. In principle, the retailer 4 operates so that the individual or total value of the power data such as the power meters 10a, 10b, and 10c collected by the collection and distribution system 10e matches the predetermined power plan. It is responsible for small or wholesale power transactions.

  The retailer 4 has a power billing system 40 and calculates a billing amount 4d for the power received by the power consumer 1c based on the power value of the collection and distribution data 10f. The retailer 4 also calculates the procurement amounts 4a and 4b for the power purchased from the power generation operators 1a and 1b, and the consignment amount 4c required for consignment by the power transmission company operating the power system 10d. The retailer 4 has a business model that adds expenses such as information and communication infrastructure for service operation to these calculation results, and adjusts the respective revenues and expenses to increase profits with fees. The billing amount 4d, the procurement amounts 4a, 4b, and the consignment amount 4c calculated by the retailer 4 are also notified to the power consumer 1c, the power generation operators 1a, 1b, and the power transmission company, respectively.

  The charger 7 possessed by the power consumer 1 c has a charging function for the electric vehicle 8. And by the combined function of the charger 7 and the electric vehicle 8, not only the direction in which the electric vehicle 8 is charged from the distribution board 3 but also the direction in which electric power is discharged from the electric vehicle 8 to the distribution board 3 is so-called. Bidirectional charging / discharging called V2G (Vehicle-to-Grid) is possible. In principle, there is no restriction on the electric vehicle 8 to be charged, and any electric vehicle 8 can be connected regardless of the ownership or the affiliation of the driver. Here, for the connection of the electric vehicle 8, for example, a charger, a cable, and a connection connector compliant with a standard such as CHAdeMO may be used.

  The electric power subsidized business 11 is a business that operates an insurance business to compensate the electric power consumer 1c when power is insufficient. The power assistance provider 11 has an assistance system 44 according to any embodiment of the present invention. And the electric power supplement provider 11 is comprised so that the internal server 9 and the internal data of the electric vehicle 8 can be received in the information server held through a communication network. For example, the power consumption information of the electric power consumer 1c and the remaining charge information (SOC: State of charge) of the power storage system 2A are received as the consumer information 11a, and the SOC of the electric vehicle 8 is received as the electric vehicle information 11b.

  For example, when the SOC of the power storage system 2A held for the power consumption information of the electric power consumer 1c is extremely low, the auxiliary system 44 of the electric power auxiliary operator 11 determines that the electric power is insufficient and operates the nearby electric vehicle 8. Information or the like requesting the interchange of power is distributed as operation information 11c to the communication terminal 12 or the like held by the operator or the owner. At that time, the position information of the electric power consumer 1c that requires the interchange of electric power may be displayed on the map of the communication terminal 12 held by the driver or the owner. Moreover, the electric power supplement provider 11 may be configured to notify the electric power consumer 1c of charging information 11d for the service to be provided by any means.

[Power storage system (first embodiment)]
FIG. 2 shows details of the power storage system 2A according to the first embodiment. The power system 10d, which is an AC power line, is connected to the main terminal of the power storage system 2A via a breaker of the distribution board 3. The AC power line is drawn into the power storage system 2A and then passed through the received voltage detection means 200. It is connected in parallel to each of the interconnection inverters (system interconnection inverters) 21a, 21b, 21c. Here, the AC power line is, for example, low-pressure three-phase AC 400 V and 200 V, or single-phase AC 100 V and 200 V, and is connected to the normal load 6 and the charger 7 of the power consumer 1 c via the distribution board 3. Has been. The interconnection inverters 21a, 21b, and 21c have two terminals of alternating current and direct current, a bidirectional power conversion function that outputs / inputs power to / from the alternating current terminal, and power to the alternating current power line, that is, the power system 10d. It has grid connection protection function to regenerate. The AC terminals of the interconnection inverters 21a, 21b, and 21c are connected to a breaker of the distribution board 3 that is a connection part of the power system 10d, the normal load 6, and the charger 7. In FIG. 2, interconnection inverters 21a, 21b, and 21c, bidirectional DC / DC converters 22a, 22b, and 22c, and storage battery blocks 23a, 23b, and 23c connect their input terminals and output terminals in parallel with each other. For example, when the basic unit capacity of each unit is 10 kW, it is assumed that the maximum charge / discharge performance of the entire system is 30 kW by using three parallel connections. . The basic capacity of each unit or the number of parallel units thereof may be selected according to the system requirements. For example, a single unit basic capacity of 30 kW may be replaced with one parallel configuration. Hereinafter, description of these parallel connections will be omitted.

  The DC terminals of the interconnection inverters 21a, 21b, and 21c (voltage part on the DC side of the grid connection inverter) are connected to the high-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b, and 22c connected in parallel. The bidirectional DC / DC converters 22a, 22b, and 22c have a bidirectional power conversion function between the power input / output to / from the high voltage DC terminal and the power output / input to the low voltage DC terminal. The low-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b, and 22c are connected in parallel to each other and then connected in parallel to terminals of the storage battery blocks (storage batteries) 23a, 23b, and 23c (voltage part on the storage battery side). Thus, the bidirectional DC / DC converters 22a, 22b, 22c are connected between the interconnection inverters 21a, 21b, 21c and the storage battery blocks 23a, 23b, 23c. With the above configuration, the storage battery blocks 23a, 23b, and 23c can be charged from the power system 10d or the charger 7 via the interconnection inverters 21a, 21b, and 21c and the bidirectional DC / DC converters 22a, 22b, and 22c. In addition, the normal load 6, the charger 7, or the power system 10d can be discharged via the bidirectional DC / DC converters 22a, 22b, 22c and the interconnection inverters 21a, 21b, 21c. In FIG. 2, the low-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b and 22c are connected in parallel to the terminals of the storage battery blocks (storage batteries) 23a, 23b and 23c (voltage part on the storage battery side). Although connected in parallel, they may be individually connected to each of the storage batteries 23a, 23b, and 23c without being connected in parallel to each other.

The interconnection inverters 21a, 21b, and 21c are controlled so as to maintain the power received by the power consumer 1c at a predetermined constant value (power target P ^** ). The signals of the received current detection means 5 and the received voltage detection means 200 are input to the current calculator 201 and the voltage calculator 203, respectively. Power calculator 202 calculates the reception power monitor value P _FB from the information of the computed voltage and current at a current calculator 201 and the voltage calculator 203. Here, proportional-integral control using the received power monitor value _PFB as a feedback signal is adopted for the control of the interconnection inverter. The PI controller 207, the difference signal with a predetermined power target P ^** and P _FB is input, the compensation signal so as to minimize this difference is output. The distributor 208 transmits a start / stop signal or a command value of charge / discharge power to the three interconnected inverters 21a, 21b, and 21c in accordance with the output signal of the proportional-plus-integral controller 207.

The bidirectional DC / DC converters 22a, 22b, and 22c maintain the voltage of the high-voltage DC terminal of the bidirectional DC / DC converter (the connection portion between the bidirectional DC / DC converter and the grid-connected inverter) at a predetermined value. Be controlled. The bidirectional DC / DC converters 22a, 22b, and 22c are controlled using a proportional-integral controller and a distributor as in the case of the interconnected inverter. The high-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b, and 22c are provided with DC voltage detection means 209, and the signal of the DC voltage detection means 209 is converted into a voltage monitor value _VFB detected by the voltage calculator 210. . The proportional-integral controller 212 receives a difference signal between the predetermined voltage target V ^* and the voltage monitor value _VFB , and outputs a compensation signal that minimizes this difference. The distributor 213 transmits a start / stop signal or a charge / discharge power command value to the three bidirectional DC / DC converters 22a, 22b, and 22c in accordance with the output signal of the proportional-plus-integral controller 212.

  Although a detailed description is omitted, each of the interconnected inverter and the bidirectional DC / DC converter includes a semiconductor power conversion circuit using a reactor element and a semiconductor switch element inside, and the distributor 208 or the distributor Based on each command signal output from the device 213, minor control of input or output current or voltage is applied to each power conversion circuit.

The storage battery blocks 23a, 23b, and 23c are configured by so-called secondary batteries such as lead storage batteries, lithium ion batteries, and flow batteries, and are configured by connecting a large number of unit cells of about several volts in series or in parallel. A plurality of types of different types of batteries may be used in combination according to the specifications. It is known that the performance of the secondary battery is significantly deteriorated due to an internal irreversible chemical reaction in an abnormal state such as overcharge or overdischarge. Therefore, the storage battery remaining charge calculating means 24 is connected to each storage battery block, and the SOC of each storage battery block is estimated. In general, the SOC is detected by using the current, voltage, and temperature information of some or all of the unit cells in the storage battery block. Here, the storage battery charge remaining amount calculation means 24 may be a dedicated battery management board mounted with a semiconductor such as a microcomputer on which SOC estimation calculation is mounted. By using the SOC obtained by the storage battery remaining charge calculating means 24, a method for preventing overcharge or overdischarge in advance becomes possible. Limit power calculator 204 suppresses charging power upper limit Pl_c when the SOC increases to near 100%, and suppresses discharge power upper limit Pl_d when the charging rate decreases to near 0% as a table in advance. And output Pl_c and Pl_d as upper and lower limit powers for the current SOC. If the power limiter 205 for setting the power target P ^** described above is provided and the power limiter 205 limits the power target P ^{** to} be within the upper and lower limits, overcharge or overdischarge of the storage battery block is prevented. be able to.

With the system configuration shown in FIGS. 1 and 2, the power storage system 2A can keep the power received by the power consumer 1c from the power grid 10d at a constant value (power target P ^** ). Here, FIG. 1 shows one power consumer 1c as an example, but since many power consumers are connected to the power grid 10d, the power grid 10d is obtained by increasing the introduction ratio of the power storage system 2A. The increase or decrease in demand for electricity will be infinitely flat. The generation of flat power demand will reduce the risk of constant power operation for power generation companies 1a and 1b, and increase the operating rate will improve the profitability of the power generation business.

  In the present invention, a part of the profit obtained by reducing the power generation cost is redistributed to the power consumer 1c that has introduced the power storage system 2A using the charging model of the retailer 4 to further increase the power storage system 2A. Can be promoted.

[Power billing system (first embodiment)]
FIG. 3 is a diagram showing a configuration of the power billing system 40 according to the first embodiment of the present invention, and FIG. 4 is a diagram showing an example of a billing model applied by the power billing system 40 to the power consumer 1c. FIG. 5 is a diagram illustrating another example of a charging model applied by the power charging system 40 to the power consumer 1c. FIG. 6 is a diagram for explaining the change over time in the power reception fee when the charging model shown in FIG. 4 is applied.

  As shown in FIG. 3, the power billing system 40 includes a received power value acquisition unit 411, a received fee determination unit 412, and a charged amount determination unit 413. The received fee determination unit 412 includes a target received power. Setting means 4121 is included. The received power value acquisition unit 411 acquires the received power value of the power consumer 1c by extracting the data of the wattmeter 10c from the measurement data of the collection and distribution system 10e every first predetermined time Ts, and receives the received power value. Manage as P [t]. Based on the received power value P [t] acquired and managed by the received power value acquiring means 411, the received power charge determining means 412 sets the received power charge of the power consumer 1c to be equal to or more than the first predetermined time Ts. Is determined every second predetermined time. At that time, the received charge determining means 412 follows the charging model as shown in FIGS. 4 and 5, and the received charge charge increases as the difference in the received power value from the target received power set by the target received power setting means 4121 increases. The power reception fee is determined so as to be higher. The billing amount determination unit 413 determines the billing amount for the power consumer 1c by integrating the power reception fees determined by the power reception fee determination unit 412 over a predetermined period.

As shown in FIG. 4, in the example of the charging model applied to the power consumer 1c by the power charging system 40, the power receiving fee increases as P [t] deviates from the predetermined target received power P ^*. I have it. Specifically P [t] in the monotonously increased in target received power P ^* larger area, the function F such that monotonically decreases in the target received power P ^* smaller area is selected.

As shown in FIG. 5, in another example of the charging model by the power charging system 40, the rate of increase in power reception fee with respect to the increase in divergence is changed according to the target power reception power P ^* . Specifically, the larger the target received power P ^* , the smaller the rate of increase in received power with respect to the increase in deviation. Note that the distribution density in FIG. 5 represents an exemplary distribution characteristic of the received power value P [t] acquired at each first predetermined time Ts.

  For example, the following method can be adopted as a method for specifically realizing the billing model according to the present embodiment.

a. The correspondence table of “received power value” and “received charge” or a function representing the relationship between the two is stored in the storage means in the power billing system, and the received charge is calculated from the received received power value by the table or function. decide.

b. Store the correspondence table of “the deviation width of the received power value from the target received power” and “the received power charge” or a function representing the relationship between both in the storage means in the power billing system, and obtain it by using the table or function. The power reception fee is determined from the received power value.
FIG. 6 shows an example of the change over time of the received charge when the charging model shown in FIG. 4 is applied, and the received charge function increases as P [t] deviates from the target received power P ^* according to the characteristics shown in FIG. F gets bigger. Assuming that the monthly power reception fee is calculated as the cumulative value of F (P [t]), the cumulative fee is pushed down in case 1 where there is no divergence, as shown in FIG. . As a result, since an incentive to suppress the divergence acts on the electric power consumer 1c, it can contribute to urging the introduction of the power storage system (the above-described power storage system 2A or the power storage system 2B described later), and consequently, The operating rate can be further increased.

  While introducing the power storage system 2A or the power storage system 2B as described above and applying a method for encouraging matching of the received power to the target received power in the power billing system 40 of the retailer, It is possible to construct a system that returns the profits obtained by the power billing system to consumers who have contributed to the introduction of the power storage system 2A or the power storage system 2B.

Here, since power converters such as grid-connected inverters or AC / DC converters are generally controlled using digital arithmetic units, the accuracy of constant control of received power varies with higher capacity systems. The width increases. For this reason, the higher the capacity of the system, the more the advantage of the charging model shown in FIG. On the other hand, in order to suppress the fluctuation range with the power converter, it is necessary to improve the detection accuracy of current sensors such as the received current detection means 5 or to increase the control speed of the grid-connected inverter or AC / DC converter, and the power storage system 2A or power storage system 2B This increases the price of the battery, and the spread of the power storage system 2A or the power storage system 2B is hindered. Therefore, as shown in FIG. 5, the function F of FIG. 4 is weighted with respect to the target received power P ^*, and the sensitivity of the function F to P [t] is adjusted so as not to increase the cost of the power converter. Thus, it is possible to construct a system that further promotes the popularization of the power storage system 2A or the power storage system 2B and flattenes the power demand, and returns the profit obtained by the power billing system to the consumer who has contributed to the introduction of the power storage system.
[Power Billing System (Second Embodiment)]
FIG. 7 is a diagram illustrating a configuration of the power billing system 42 according to the second embodiment of the present invention, and FIG. 8 is a diagram illustrating an example of a billing model that the power billing system 42 applies to the power consumer 1c. FIG. 9 is a diagram for explaining the change over time in the power reception fee when the charging model shown in FIG. 8 is applied. The power billing system 42 corresponds to a modification of the power billing system 40 described above.

As shown in FIG. 7, the power billing system 42 includes a received power value acquisition unit 421, a received charge determination unit 422, and a charged amount determination unit 423. The received fee determination unit 422 calculates the maximum deviation. Means 4221 are included. Similarly to the above-described 411, the received power value acquisition unit 421 extracts the data of the wattmeter 10c from the measurement data of the collection and distribution system 10e every first predetermined time Ts, thereby obtaining the received power value of the power consumer 1c. Obtained and managed as received power value P [t]. As shown in FIG. 9, the maximum deviation calculating means 4221 divides the obtained received power P [t] every second predetermined time Ts2, and then receives the received power included in the sth second predetermined time. the average value of P [t] is calculated as P _ave [s], the maximum value of the difference (deviation) of the received power P [t] and the average value P _ave [s] in the s-th second predetermined time Calculated as ΔP _max [s]. The maximum value of this difference is shown as “maximum power reception deviation” in FIG. 8 and is a value calculated as a fluctuation amount of the power reception power value in the second predetermined time. Based on ΔP _max [s] calculated by the maximum deviation calculating means 4221, the power receiving charge determining means 422 determines the power receiving charge of the power consumer 1c every second predetermined time. At that time, the power receiving fee determining means 422 increases the power receiving fee as the maximum deviation value ΔP _max [s] calculated by the maximum deviation calculating means 4221 increases according to the charging model as shown in FIG. Then, determine the power reception fee. As shown in FIG. 8, in the example of the charging model applied to the power consumer 1c by the power charging system 42, the function G such that the power receiving fee in the sth period increases monotonously with respect to ΔP _max [s]. Given in.

  For example, the following method can be adopted as a method for specifically realizing the billing model according to the present embodiment.

a. The correspondence table of “maximum power reception deviation” and “power reception fee” or a function representing the relationship between the two is stored in the storage means in the power billing system, and the power reception fee is calculated from the acquired power reception value by the table or function. decide.
Even with this method, incentives to flatten the power demand are urged in the power consumer 1c, so the profit obtained by the power billing system is returned to the consumer who contributed to the introduction of the power storage system while flattening the power demand. You can build a system.

[Power Billing System (Third Embodiment)]
FIG. 10 is a diagram showing a configuration of a power billing system 43 according to the third embodiment of the present invention, and FIG. 11 is a diagram showing an example of a billing model applied by the power billing system 43 to the power consumer 1c. FIG. 12 is a diagram for explaining the change over time in the power reception fee when the charging model shown in FIG. 11 is applied. The power billing system 43 also corresponds to a modified example of the power billing system 40 described above.

  As shown in FIG. 10, the power billing system 43 includes a received power value acquisition unit 431, a received fee determination unit 432, and a charged amount determination unit 433, and the received fee determination unit 432 includes a cumulative change amount. Calculation means 4321 is included. Similarly to the above-described 411 and 421, the received power value acquisition unit 431 extracts the data of the wattmeter 10c from the measurement data of the collection and distribution system 10e every first predetermined time Ts, thereby receiving the received power of the power consumer 1c. A value is acquired and managed as a received power value P [t]. As shown in FIG. 12, the cumulative change amount calculation unit 4321 divides the obtained received power P [t] every second predetermined time Ts2, and then sequentially changes the received power P [t], that is, ΔP. An integrated value ΣΔP [t] within [s] second predetermined time of [t] = | P [t] −P [t−Ts] | is calculated. This integrated value is shown as “cumulative received power change amount” in FIG. 11, and is a cumulative value of the change amount between the received power values acquired before and after, and the amount of change in the received power value during the second predetermined time. Is a value calculated as The power reception fee determining unit 432 determines the power reception fee of the power consumer 1c every second predetermined time based on ΣΔP [t] calculated by the cumulative change amount calculation unit 4321. At that time, the power receiving fee determining means 432 follows the charging model as shown in FIG. 11 so that the power receiving fee increases as the integrated value ΣΔP [t] calculated by the cumulative change amount calculating means 4321 increases. Determine the fee. As shown in FIG. 11, in the example of the charging model applied to the power consumer 1c by the power charging system 43, the power reception fee for the sth second predetermined time increases monotonously with respect to the integrated value ΣΔP [t]. Is given by function H.

  For example, the following method can be adopted as a method for specifically realizing the billing model according to the present embodiment.

a. A correspondence table of “cumulative power reception change amount” and “power reception fee” or a function representing the relationship between the two is stored in a storage means in the power billing system, and the power reception fee is obtained from the received power value obtained by the table or function. To decide.
Even with this method, incentives to flatten the power demand are urged in the power consumer 1c, so the profit obtained by the power billing system is returned to the consumer who contributed to the introduction of the power storage system while flattening the power demand. You can build a system.

[Power System (Fourth Embodiment)]
FIG. 13 is a diagram showing an entire power system 2000 including the power billing system 40, the power storage system 2B, and the auxiliary system 44 according to the fourth embodiment of the present invention. This power system is different from the power system 1000 shown in FIG. 1 only in the configuration within the power consumer 1c. Here, the description of the same part as FIG. 1 in FIG. 13 is omitted. The power consumer 1 c in the power system 2000 connects the power storage system 2 </ b> B through the distribution board 31. The power storage system 2B is provided with an output terminal, and a second distribution board 32 is connected downstream of the output terminal. The normal load 6 and the charger 7 are connected to the output terminal of the power storage system 2B via the second distribution board 32.

[Power storage system (fourth embodiment)]
FIG. 14 shows details of a power storage system 2B according to the fourth embodiment. The power storage system 2B is different from the power storage system 2A according to the first embodiment in that the received current detection means 5 is mounted inside the power storage system 2B (however, if necessary, the power storage system 2B is similar to the power storage system 2A). It may be installed outside of.) The AC power line input to the power storage system 2B is connected to the AC input terminal of the AC / DC converter 21d. The AC / DC converter 21d is a converter that can operate only in one direction of forward conversion for converting alternating current input to direct current output, and does not involve regeneration to the power system 10d, so that the grid interconnection protection function can be omitted. Since the control is only a function of controlling the received power to be constant, the software can be simplified, and there is an advantage that the cost can be reduced as compared with the interconnection inverters 21a to 21c of the power storage system 2A. The DC side of the AC / DC converter 21d (the voltage part on the DC side of the AC / DC converter) is in parallel with the high-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b, and 22c similar to the power storage system 2A of the first embodiment. Connected. The bidirectional DC / DC converters 22a, 22b, and 22c perform bidirectional power conversion between power input / output to the high-voltage DC terminal and power output / input to the low-voltage DC terminal, as in the first embodiment. The low-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b, and 22c are connected in parallel to the terminals of the storage battery blocks (storage batteries) 23a, 23b, and 23c (voltage part on the storage battery side). Connected in parallel. Similarly to the first embodiment, the low-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b, and 22c may be individually connected to the storage batteries 23a, 23b, and 23c without being connected in parallel to each other. Thus, the bidirectional DC / DC converters 22a, 22b, and 22c are connected between the AC / DC converter 21d and the storage battery blocks 23a, 23b, and 23c. Further, the DC input terminals of the DC / AC inverters 26a, 26b, and 26c are connected in parallel to the high-voltage DC terminals of the bidirectional DC / DC converters 22a, 22b, and 22c (DC side of the AC / DC converter 21d). The bidirectional DC / DC converters 22a, 22b, and 22c and the input / output of the DC / AC inverters 26a, 26b, and 26c are connected in parallel, as described above. It is. The DC / AC inverters 26a, 26b, and 26c are converters capable of bidirectional operations of reverse conversion for converting a direct current input into an alternating current output and forward conversion for regenerating surplus power generated in the alternating current output to the direct current input. The parallel portions of the output terminals of the DC / AC inverters 26a, 26b, and 26c are connected to the normal load 6 and the charger 7 of the power consumer 1c through the output current detection means 220 and the output terminal of the power storage system 2B (see FIG. 13). Thus, the DC / AC inverters 26a, 26b, and 26c are connected between the connection portion between the AC / DC converter 21d and the bidirectional DC / DC converters 22a, 22b, and 22c and the normal load 6 or the charger 7. Is done. With the above configuration, the storage battery blocks 23a, 23b, and 23c can be charged from the power system 10d via the AC / DC converter 21d and the bidirectional DC / DC converters 22a, 22b, and 22c. The storage battery blocks 23a, 23b, and 23c can be discharged to the normal load 6 or the charger 7 through the bidirectional DC / DC converters 22a, 22b, and 22c and the DC / AC inverters 26a, 26b, and 26c. Furthermore, the storage battery blocks 23a, 23b, and 23c can be charged from the charger 7 through the DC / AC inverters 26a, 26b, and 26c and the bidirectional DC / DC converters 22a, 22b, and 22c.

The AC / DC converter 21d is controlled to maintain the power received by the power consumer 1c, that is, the input power of the AC / DC converter 21d at a predetermined constant value (power target P ^** ). The signals of the received current detection means 5 and the received voltage detection means 200 are input to the current calculator 201 and the voltage calculator 203, respectively. Power calculator 202 calculates the reception power monitor value P _FB from the information of the computed voltage and current at a current calculator 201 and the voltage calculator 203. Here, as in the first embodiment, proportional-integral control using the received power monitor value _PFB as a feedback signal is adopted for the control of the AC / DC converter 21d. The PI controller 207, the difference signal with a predetermined power target P ^** and P _FB is input, the compensation signal so as to minimize this difference is output. In this example, since there is only one AC / DC converter 21d, the distributor 208 as provided in the first embodiment is not provided, but a plurality of AC / DC converters 21d are provided. Control may be performed via a similar distributor.
The description regarding the bidirectional DC / DC converters 22a, 22b, and 22c and the storage battery blocks 23a, 23b, and 23c is the same as that of the first embodiment, and is omitted here. The bidirectional DC / DC converters 22a, 22b, and 22c are distributed by the distributor 213 so as to maintain the voltage of the high-voltage direct current terminal (connection portion between the bidirectional DC / DC converter and the AC / DC converter 21d) at a predetermined value. Be controlled. 14 is different from the waveform and output of 204 in FIG. 2 in that the AC / DC converter 21d is used only for charging the storage battery blocks 23a, 23b, and 23c in FIG. Therefore, it is not necessary to suppress the upper limit Pl_d of the discharge power shown in FIG.
The DC / AC inverters 26a, 26b and 26c are controlled so that the AC output (load side AC voltage) maintains a predetermined sine wave AC voltage. When an overload occurs in the output of the power storage system 2B, or when the SOC of the storage battery blocks 23a, 23b, and 23c is insufficient, the output power is suppressed by dropping the AC voltage. The current calculator 221 detects the signal obtained by the output current detection means 220 as the output current Io. As shown in FIG. 14, the limit voltage calculator 222 has a drooping characteristic with respect to the output current signal Io as a table, and the limit voltage calculator 223 has a characteristic that droops in a region where the SOC is low. The limiters 224 and 225 act as limiter values. The obtained voltage target value V ^** is distributed to each DC / AC inverter 26a, 26b, 26c in distributor 226, so that the output voltage of power storage system 2B is drooped according to output current signal Io and SOC. it can.

  In FIG. 14, the AC / DC converter has one parallel configuration, the bidirectional DC / DC converter and the DC / AC inverter have three parallel configurations, and the capacity of the AC / DC converter is the bidirectional DC / DC converter and the DC / AC. It is smaller than the capacity of the inverter. The input and output capacities of the power storage system 2B are 10 kW input and 30 kW output when the single unit capacity is 10 kW. With such a configuration, while the breaker capacity of the distribution board 31 is 10 kW, the output capacity of the power storage system 2B can be increased to 30 kW. In other words, the breaker capacity of the distribution board 31 can be reduced to 10 kW with respect to the power capacity 30 kW used by the power consumer 1c.

  As described above, the cost can be reduced by using the AC / DC converter instead of the grid inverter, and the AC / DC converter capacity can be made smaller than the output capacity of the power storage system 2B. Advantages can be obtained by reducing the breaker capacity of the distribution board 31 and power receiving equipment such as a transformer. In addition, since the power demand flattening function can be integrated into one element of the AC / DC converter, the technical level of the flattening performance required for the above-mentioned power billing system, for example, the slope of the functions F, G, H is increased. Has an advantage that only the AC / DC converter portion can be updated to a high-performance one.

[Auxiliary system (fifth embodiment)]
FIG. 15 is a diagram illustrating a configuration of an auxiliary system 44 according to the fifth embodiment, and FIG. 16 is a diagram for explaining an operation of the auxiliary system illustrated in FIG. 15. The auxiliary system 44 assists in appropriately maintaining the remaining charge of the storage batteries 23a to 23c in the power storage systems 2A and 2B described above. As shown in FIG. 15, the auxiliary system 44 includes a remaining charge amount acquisition unit 441, a remaining charge excess / deficiency prediction unit 442, and a request notification unit 443.

The remaining charge acquisition means 441 acquires the remaining charge of the storage batteries 23a to 23c from the consumer information 11a (FIGS. 1 and 13) at an appropriate timing. The remaining charge excess / deficiency foreseeing means 442 predicts the shortage and excess of the remaining charge of the storage batteries 23a to 23c based on the remaining charge obtained by the remaining charge acquisition means 441. For example, as shown in FIG. 16, while the time change of the SOC is held as a planned value in advance for the power consumption information of the power consumer 1c, the actual SOC at the time T1 is a predetermined amount ΔS _{L with} respect to the planned value. If there is a shortage above, foresee a shortage of remaining charge. When a shortage of remaining charge is foreseen by the remaining charge excess / deficiency foreseeing means 442, the request notifying means 443 passes through the communication terminal 12 to a replenishment client (driver or owner) capable of driving the electric vehicle 8 in the vicinity. Replenishment request information (discharge request information for requesting discharge from the electric vehicle to the storage battery) is notified. The supply request information includes unit price information per electric power to be supplied, and this unit price information may be changed according to increase / decrease in the SOC. By increasing the consideration for replenishment as the SOC deviates, it becomes possible for the replenishment operator to ensure a replenishment client. The replenishment client cooperating with replenishment makes a replenishment contract through the communication terminal 12 at time T <b> 2, visits the power consumer 1 c and performs power interchange via the charger 7. After that, when the SOC planned value and the actual data match at time T3, the replenishment company ends the replenishment request to the client. Although FIG. 16 shows when the power is insufficient, it can be applied to a service for supplying power to the electric vehicle when the power is surplus. For example, when the power consumed by the normal load 6 shown in FIGS. 1 and 13 is significantly lower than planned, surplus power is generated if the received power is maintained at a constant value, so that the SOC of the storage batteries 23a to 23c is increased. This makes it difficult to maintain the received power. In such a case, the electric power consumer 1c is notified by notifying the driver or owner of the nearby electric vehicle 8 of information (charging request information for requesting charging from the storage battery to the electric vehicle) for a client to charge. The received power can be maintained.
Although various embodiments of the present invention have been described above, the present invention is not limited to the various embodiments described above. For example, in the above-described embodiment, the power billing system 40 and the auxiliary system 44 are systems that the retailer 4 and the power assistant 11 have, respectively, but may be systems that other parties have. Good. In addition, the functions F, G, and H shown in FIGS. 4, 5, 8, and 11 are linear functions, but may be curved functions. In FIG. 5, the slope of the function becomes gentler as the received power value increases, but the reverse may be possible. Conversely, it is possible to take in a large number of small-sized electric power consumers that alone have little influence on the overall demand and are expected to have difficulty in large-scale capital investment.

  DESCRIPTION OF SYMBOLS 1c ... Electric power consumer, 2A, 2B ... Power storage system, 6 ... Normal load (load), 7 ... Charger, 8 ... Electric vehicle, 10d ... Electric power system, 21a, 21b, 21c ... Interconnection inverter (system interconnection inverter ), 21d ... AC / DC converter, 22a, 22b, 22c ... Bidirectional DC / DC converter, 23a, 23b, 23c ... Storage battery block (storage battery), 26a, 26b, 26c ... DC / AC inverter, 40, 41, 42 , 43 ... Power billing system, 44 ... Auxiliary system, 411, 421, 423 ... Received power value acquisition means, 412, 422, 432 ... Received charge determination means, 413, 423, 433 ... Charge amount determination means, 441 ... Remaining charge Quantity acquisition means, 442 ... excess remaining charge prediction, 443 ... request notification means, 1000, 2000 ... power system, 4121 ... eyes Receiving power setting means, 4221 ... maximum deviation calculating means, 4321 ... cumulative change amount calculating means.

Claims (10)

A received power value acquisition means for acquiring a received power value of a power consumer every first predetermined time;
Based on the received power value acquired by the received power value acquiring means, the received power charge determining means for determining the power consumer's power receiving fee every second predetermined time that is equal to or longer than the first predetermined time. When,
Charge amount determining means for integrating the power reception fee determined by the power reception fee determining means over a predetermined period to determine a charge amount for the power consumer;
With
The power reception fee determining means determines the power reception fee so that the power reception fee increases as the deviation of the power reception power value from the target power reception or the fluctuation amount of the power reception value in the second predetermined time increases. decide,
Electricity billing system. The power reception fee determining means is a means for determining the power reception fee so that the power reception fee becomes higher as the deviation from the target power reception power value is larger.
The received power charge determining means includes target received power setting means for setting the target received power.
The power billing system according to claim 1.   The power receiving fee determining means is a means for determining the power receiving fee so that the power receiving fee becomes higher as the deviation from the target received power of the received power value is larger, and the rate of increase in the power receiving fee with respect to the increase in the deviation is calculated. The power billing system according to claim 1, wherein the power billing system is changed according to the target received power. The power receiving fee determining means is a means for determining the power receiving fee such that the power receiving fee becomes higher as the fluctuation amount of the received power value in the second predetermined time is larger.
The power reception fee determining means obtains an average value of the received power value in the second predetermined time from the determination of the previous power reception fee to the determination of the current power reception fee, and between the average value and each received power value. A maximum deviation calculating means for obtaining a maximum value of the deviation between,
The amount of variation is the maximum value of the deviation.
The power billing system according to claim 1. The power receiving fee determining means is a means for determining the power receiving fee such that the power receiving fee becomes higher as the fluctuation amount of the received power value in the second predetermined time is larger.
The power reception fee determining means obtains a cumulative value of the amount of change between the received power values acquired before and after the second predetermined time from the determination of the previous power reception fee to the determination of the current power reception fee. A cumulative change amount calculating means;
The amount of variation is a cumulative value of the amount of change.
The power billing system according to claim 1. A power storage system installed in a power consumer charged by the power billing system according to any one of claims 1 to 5,
A grid-connected inverter that is connected to a connecting portion between a power system and the load of the power consumer and converts AC power and DC power bidirectionally;
A storage battery,
A bi-directional DC / DC converter connected between the grid-connected inverter and the storage battery and bi-directionally converting electric power between the DC-side voltage section of the grid-connected inverter and the storage battery-side voltage section; ,
With
The storage battery can be charged from the power system via the grid-connected inverter and the bidirectional DC / DC converter, and the storage battery can be charged via the bidirectional DC / DC converter and the grid-connected inverter. Discharge to the load,
The grid-connected inverter is controlled so that the received power received by the power consumer matches a predetermined power target, and the bidirectional DC / DC converter includes the bidirectional DC / DC converter and the grid-connected inverter. It is controlled so that the DC voltage of the connection part becomes a substantially constant value.
Power storage system. A power storage system installed in a power consumer charged by the power billing system according to any one of claims 1 to 5,
An AC / DC converter connected to the power system and converting AC power to DC power;
A storage battery,
A bidirectional DC / DC converter that is connected between the AC / DC converter and the storage battery, and that converts power bidirectionally between a DC voltage section of the AC / DC converter and the storage battery voltage section; ,
A DC / AC inverter that is connected between a connection between the AC / DC converter and the bidirectional DC / DC converter and a load of the power consumer, and that converts DC power and AC power bidirectionally;
With
The storage battery can be charged from the power system via the AC / DC converter and the bidirectional DC / DC converter,
The storage battery can be discharged to the load via the bidirectional DC / DC converter and the DC / AC inverter,
The AC / DC converter is controlled so that the received power received by the power consumer matches a predetermined power target, and the bidirectional DC / DC converter is a connection between the bidirectional DC / DC converter and the AC / DC converter. The DC voltage of the unit is controlled to be a constant value, and the DC / AC inverter is controlled so that the load side AC voltage becomes a predetermined AC voltage.
Power storage system.   The power storage system according to claim 7, wherein the AC / DC converter is controlled so that input power of the AC / DC converter matches the predetermined power target.   The power storage system according to claim 7 or 8, wherein a capacity of the AC / DC converter is smaller than a capacity of the bidirectional DC / DC converter and the DC / AC inverter. An auxiliary system that assists in appropriately maintaining the remaining charge of the storage battery in the power storage system according to any one of claims 6 to 9,
Remaining charge acquisition means for acquiring the remaining charge of the storage battery;
A charge remaining amount excess / deficiency foreseeing means for predicting shortage and excess of the remaining charge amount of the storage battery based on the remaining charge amount;
Notifying the driver or owner of the electric vehicle of discharge request information for requesting discharge from the electric vehicle to the storage battery when the remaining amount of charge is foreseen by the overcharge shortage prediction means, In the case where an excess of the remaining charge is foreseen by the remaining charge excess / deficiency foreseeing means, the charge request information for requesting charging from the storage battery to the electric vehicle is notified to the driver or owner of the electric vehicle. Request notification means;
Comprising
Auxiliary system.

Images