JP2014106659A - Electric power buying and selling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power buying and selling system in which a general user can easily introduce a stationary accumulator battery and power conversion equipment.SOLUTION: The electric power buying and selling system includes a stationary accumulator battery 10 which stores electric power supplied by system power 90, a solar battery 20, and a load 13 which is supplied with electric power by the system power 90 or the stationary accumulator battery 10. The system includes: a first power meter 12 for measuring electric power bought from/sold to the system power 90; a second power meter 14 for measuring electric power supplied from the system power 90, the stationary accumulator battery 10 or the solar battery 20 to the load 13; and a third power meter 15 for measuring electric power supplied from the solar battery 20 to the load 13 or the stationary accumulator battery 10. The system further includes a first arithmetic storage device 15 and a second arithmetic storage device 17 for calculating an electricity rate to be charged upon a general user 1 in accordance with the electric power measured by the power meters.

Description

  The present invention relates to a power trading system, and particularly to a power trading system including a stationary storage battery and a power conversion device owned by a general user.

  In recent years, stationary storage batteries have been put to practical use as devices for storing electric power in general households. A general user who purchases (or rents) a stationary storage battery can use it during the daytime by purchasing relatively inexpensive power (for example, late-night power) from an electric utility and storing it.

  In addition, by using a stationary storage battery, it is possible to stably supply power from a power converter using natural energy whose amount of power generation depends on the weather, such as a solar battery. As a result, it is possible to compensate for power leveling, that is, variations in power consumption during the day / night, and variations in power generation due to the weather.

  In relation to the above, a technology has been disclosed and proposed that saves electricity costs by storing cheap midnight power in storage batteries and using the stored power during the day to turn the power generated by solar power generation into electricity sales. (For example, refer to Patent Document 1).

JP-A-2005-97795

  However, the stationary storage battery and the power conversion device have a problem that since the initial equipment cost is large, it is difficult for a general user to easily introduce and the spread is difficult to proceed.

  This invention is made | formed in view of the said problem, The objective is to provide the electric power trading system which a general user can introduce a stationary storage battery and a power converter device easily.

  In order to achieve the above object, an electric power trading system according to the present invention transfers power between a power conversion device that converts energy obtained from nature into power and the power conversion device or a commercial AC power supply. A storage battery that discharges; a load that receives power supply from the power converter or the commercial AC power supply or the storage battery; power that is supplied from the commercial AC power supply to the load or the storage battery; and the storage battery or the power A first wattmeter that measures power supplied from the converter to the commercial AC power supply; a second wattmeter that measures power supplied from the commercial AC power supply or the storage battery or the power converter to the load; A third wattmeter that measures power supplied from the power converter to the load or the storage battery, and power measured by the first wattmeter According to the first power data to be shown, the second power data to show the power measured by the second power meter, and the third power data to show the power measured by the third power meter, the user of the storage battery And an arithmetic unit that calculates an electricity bill to be charged.

  Note that the power trading system having the above-described configuration is such that the arithmetic device has the commercial AC based on the power indicated by the first power data and a unit price of power determined in advance according to a measurement time of the power. A first electricity charge, which is an electricity charge based on power exchanged with a power supply, is calculated, and the computing device is a difference between the power indicated by the second power data and the power indicated by the third power data. A configuration may be adopted in which a second electricity charge, which is an electricity charge based on the power supplied to the load, is calculated based on the difference power and a power unit price determined in advance according to the measurement time of the difference power. .

  The power trading system having the above configuration is configured such that the arithmetic device calculates the difference power according to the DC / AC conversion efficiency of the power obtained by the power conversion device in the calculation of the difference power. Good.

  The power trading system configured as described above charges the user of the storage battery based on the first electricity charge or the second electricity charge, and the money obtained by the charge is provided by the provider of the storage battery or A configuration may be adopted in which a charge server is provided that is distributed to an electric power company that provides the commercial AC power supply.

  In the power trading system having the above-described configuration, when the charge server charges the user, a charge that is a charge that the user who installed the storage battery obtains as a charge for the installation is as follows: It is good to make the structure which deducts and charges.

  In the power trading system configured as described above, the charge server includes a first charge server owned by the electric utility and a second charge server owned by the provider, and the first charge server includes the first charge server. It is preferable that the first electricity charge is charged to a two-charge server, and the second charge server is configured to charge the second electricity charge to the user.

  In the power trading system configured as described above, the fee server includes a first fee server owned by the electric utility and a second fee server owned by the provider, and the first fee server is the use The user charges the first electricity charge, and the second charge server charges the user a saving electricity charge that is a charge obtained by subtracting the first electricity charge from the second electricity charge. It is good to have a configuration to do.

  In the power trading system configured as described above, the charge server includes a first charge server owned by the electric power company, and the first charge server charges the user with the second electric charge. It is good to have a configuration to do.

  The power trading system having the above configuration includes a fourth wattmeter provided between the commercial AC power supply and the connection node of the load and the storage battery, and the fourth wattmeter includes the commercial AC power supply. Alternatively, charging power supplied from the power conversion device to the storage battery and discharging power supplied from the storage battery to the load or the commercial AC power source are measured, and fourth power data indicating the charging power and the discharging power is obtained. The calculation device generates the power indicated by the second power data, the third power data, and the fourth power data, and a power unit price that is determined in advance according to the measurement time of the power. Thus, the second electricity rate may be calculated.

  The power trading system having the above configuration includes a fourth wattmeter provided between the commercial AC power supply and the connection node of the load and the storage battery, and the fourth wattmeter includes the commercial AC power supply. The charging power supplied from the storage battery to the storage battery and the discharging power supplied from the storage battery to the load are measured to generate fourth power data indicating the charging power and the discharging power. The second electricity rate may be calculated on the basis of the power indicated by the four power data and the unit price of power determined in advance according to the measurement time of the power.

  Note that in the power trading system having the above-described configuration, the arithmetic device has the second power based on the power indicated by the second power data and the unit price of power determined in advance according to the measurement time of the power. An electricity fee is calculated, and the second fee server is a fee that is charged as a consideration for the installation by the user who installed the storage battery and the power conversion device when charging the user. It is good to make it the structure which subtracts and charges.

  Note that the power trading system configured as described above may be configured such that the calculation device has calculation information for calculating the first electricity charge or the second electricity charge based on the unit price of electric power.

  In addition, the electric power trading system which consists of the said structure is provided between the said 1st wattmeter, the said 2nd wattmeter, the said 3rd wattmeter, and the said storage battery, and is the power which converts and adjusts an electric current. A configuration having a conditioner is preferable.

  In the power trading system having the above configuration, the power conversion device is a solar power generation device that converts solar energy into electric power, a wind power generation device that converts wind energy into electric power, and a hydroelectric power generation device that converts hydraulic energy into electric power. Alternatively, it may be configured to be a geothermal power generation device that converts geothermal energy into electric power.

  ADVANTAGE OF THE INVENTION According to this invention, the electric power trading system which a general user can introduce a stationary storage battery and a power converter device easily can be provided.

It is a block diagram which shows the system configuration | structure of the electric power trading system which concerns on 1st Embodiment. It is a block diagram which shows the apparatus contained in the electric power trading system which concerns on 1st Embodiment. It is a block diagram which shows the apparatus contained in the electric power trading system which concerns on 1st Embodiment. It is a block diagram which shows the system configuration | structure of the electric power trading system which concerns on 2nd Embodiment. It is a block diagram which shows the apparatus contained in the electric power trading system which concerns on 2nd Embodiment. It is a block diagram which shows the system configuration | structure of the electric power trading system which concerns on 3rd Embodiment. It is a block diagram which shows the apparatus contained in the electric power trading system which concerns on 3rd Embodiment. It is a block diagram which shows the system configuration | structure of the electric power trading system which concerns on 4th Embodiment. It is a block diagram which shows the apparatus contained in the electric power trading system which concerns on 4th Embodiment. It is a block diagram which shows the system configuration | structure of the electric power trading system which concerns on 5th Embodiment. It is a block diagram which shows the apparatus contained in the electric power trading system which concerns on 5th Embodiment. It is a block diagram which shows the system configuration | structure of the electric power trading system which concerns on 6th Embodiment. It is a block diagram which shows the apparatus contained in the electric power trading system which concerns on 6th Embodiment. It is a block diagram which shows the system configuration | structure of the conventional electric power trading system. It is a block diagram which shows the apparatus contained in the conventional electric power trading system.

  Hereinafter, a power trading system according to an embodiment of the present invention will be described with reference to the drawings. In addition, embodiment shown here is an example and this invention is not limited to embodiment shown here.

<First Embodiment>
First, in order to explain the difference between the prior art and the present invention, a conventional power trading system will be described.

  FIG. 14 is a block diagram showing a system configuration of a conventional power trading system. The conventional power trading system is configured to include a general user 101, an electric power company 102, a storage battery manufacturer 103, a storage battery 110, and a solar battery 120.

  The storage battery manufacturer 103 provides (sells or rents) the stationary storage battery 110 to the general user 101.

  The general user 101 purchases relatively inexpensive power such as late-night power, stores it in the stationary storage battery 110, and uses it during the day. Further, the general user 101 can store the electric power obtained from the solar battery 120 in the stationary storage battery 110 or sell it to the electric power company 102.

  In order to calculate the electricity bill paid from the general user 101 to the electric power company 102, a wattmeter 112 shown in FIG. 15 is installed in the house of the general user 101. FIG. 15 is a block diagram illustrating an example of a device installed in a house of the general user 101.

  As shown in FIG. 15, the first power line coming out of stationary storage battery 110 merges with the second power line connecting load 113 and system power 190 via power conditioner 111 responsible for AC / DC conversion. On the second power line, a wattmeter 112 is disposed on the system power 190 side as viewed from the junction. The power conditioner 111 and the solar cell 120 are connected by a third power line.

  However, in the conventional power trading system as described above, there is no method for calculating a virtual electricity rate when it is assumed that the stationary storage battery 110 is not installed. In other words, it is not possible to calculate the electricity cost of power saved by the user using the stationary storage battery 110 and the solar battery 120 (hereinafter referred to as “save electricity charge”), and thus it was not possible to charge based on the saved electricity charge. .

  The present invention provides a power trading system that allows a general user to easily introduce a power storage device such as a stationary storage battery and a solar battery by charging on the basis of a saving electricity charge.

  FIG. 1 is a block diagram showing the system configuration of the power trading system according to the first embodiment of the present invention. The power trading system of this embodiment includes a general user 1 (= user), an electric power company 2, a storage battery manufacturer 3 (= provider), a stationary storage battery 10 (= storage battery), and a solar battery 20 (= power conversion device). ).

  As a point different from FIG. 14 of the prior art, the general user 1 provides land for installing the stationary storage battery 10 to the storage battery manufacturer 3. Then, the price for providing the land (hereinafter referred to as “land use fee”) is received from the storage battery manufacturer 3.

  On the other hand, the storage battery manufacturer 3 offers the stationary storage battery 10 to the general user 1 free of charge, or sells or rents for a fee at a price discounted from the normal initial installation cost. Instead, a virtual electricity charge (hereinafter referred to as “virtual electricity charge”) when it is assumed that the general user 1 did not introduce the stationary storage battery 10 is collected from the general user 1.

  FIG. 2 is a block diagram showing an example of a device installed in the home of the general user 1 in order to calculate the virtual electricity rate. A difference from the prior art FIG. 13 is that it includes three power meters, a first power meter 12, a second power meter 14, and a third power meter 15.

  The first power line that comes out of the stationary storage battery 10 is a second power line that connects the load 13 and the system power 90 (= commercial AC power supply) via the power conditioner 11 (= power conditioner) that performs AC / DC conversion. = Join node). The load 13 is, for example, a household electric product. In addition, when the reverse flow from the stationary storage battery 10 to the grid power 90 is not recognized in the system, the power conditioner 11 operates to prevent the reverse flow.

  In the second power line, the first wattmeter 12 is disposed on the grid power 90 side as viewed from the merging point, and the second wattmeter 14 is disposed on the load 13 side as viewed from the merging point. In addition, a third wattmeter 15 is disposed on a third power line connecting the power conditioner 11 and the solar battery 20. The 2nd wattmeter 14 and the 3rd wattmeter 15 of this embodiment are used for calculating a virtual electricity bill, and this is used as a basis for charging the general user 1.

  FIG. 3 is a block diagram showing a power trading device owned by the electric power company 2 and the storage battery manufacturer 3 in addition to the device set in the house of the general user 1 shown in FIG. In FIG. 3, a square frame indicates hardware, a solid line indicates a power line, a broken line arrow indicates a flow of information through a communication network or a wireless communication network, and a thick arrow indicates charging to the general user 1.

  In FIG. 3, the charge A actually generated electricity charge (= first electricity charge), the charge B is a virtual electricity charge (= second electricity charge), and the charge C is a land use charge (= consideration charge) from the virtual electricity charge. The charge is deducted.

  In FIG. 3, the constituent elements surrounded by a broken line α are constituent elements unique to the present invention. The constituent elements surrounded by the broken line β are additional constituent elements for specifying the present invention in detail. The constituent elements that are not surrounded by the broken lines α and β are constituent elements that have conventionally existed. The present invention specifies a virtual electricity rate by adding the constituent elements surrounded by a broken line α.

  The first wattmeter 12, the second wattmeter 14 and the third wattmeter 15 measure the power flowing through the power line. The power data obtained as a result of the measurement is input to the first arithmetic storage device 16 and the second arithmetic storage device 17, respectively. The first wattmeter 12 and the second wattmeter 14 measure AC power, and the third wattmeter 15 measures DC power.

  The first arithmetic storage device 16 calculates an electric bill based on the electric power data A (= first electric power data) input from the first electric power meter 12 and the electric power unit price at the time when the electric power data A is measured. , Output as charge A. The power unit price is determined using a unit price table (= calculation information) stored in advance in the first calculation storage device 16.

  For example, the charge A is calculated by adding the contract basic charge to the product obtained by integrating the product of the power data A and the power unit price at the time when the power data A is measured with time. That is, the fee A can be calculated by the following equation (1), for example. However, the charge A is not limited to the equation (1) as long as it is calculated based on the power data A and the unit price of power at the time when the power data A is measured.

  In the formula (1), A represents power data A. The unit price of electric power in equation (1) is switched depending on whether the power data A is positive or negative. In the power data A, the direction from the grid power 90 to the first wattmeter 12 is positive (power purchase), and the reverse direction is negative (power sales). When power purchase is performed, the first arithmetic storage device 16 determines a power unit price using a power purchase unit price table. On the other hand, when the power sale is performed, the first arithmetic storage device 16 determines the power unit price using the power sale unit price table.

  The second arithmetic storage device 17 includes the power indicated by the power data B1 (= second power data) input from the second wattmeter 14 and the power data B2 (= third power data) input from the third wattmeter 15. , The inverter efficiency η in the input power to the power conditioner 11, and the power unit price at the time when each power data is measured, and output as a charge B.

  For example, the charge B which is a virtual electricity charge is obtained by subtracting the product of the power data B2 reflecting the power generated by the solar battery 20 and the inverter efficiency η from the power data B1 reflecting the power consumed by the load 13, and It is calculated by adding the contract basic charge to the product obtained by integrating the product of the power unit price at the time when this power is measured and the time. That is, for example, it can be calculated by the following equation (2). However, the charge B is calculated based on the power obtained by subtracting the product of the power data B1, the power data B2, and the A / D conversion efficiency η, and the unit price of power at the time when the power data is measured. Well, it is not limited to equation (2).

  Note that B1 and B2 in the equation (2) indicate power data B1 and B2. In addition, η in the equation (2) indicates A / D conversion efficiency. η is the conversion efficiency in the input power to the power conditioner 11 and is obtained from the A / D conversion efficiency table stored in the second arithmetic storage device 17 in advance.

  The second arithmetic storage device 17 switches the unit price table to be used in accordance with the sign of “B1 (t) −B2 (t) × η (B2)” in the equation (2). That is, it is switched between using a power selling table or a power buying table.

  Under the assumption that the stationary storage battery 10 is not installed, when the power obtained by subtracting the product of the power data B2 and the A / D conversion efficiency η from the power data B1 is positive, the power generation amount of the solar cell 20 is the load 13 If the power obtained by subtracting the product of the power data B2 and the A / D efficiency η from the power data B1 is negative because the power consumption is below the power consumption, the solar battery 20 This corresponds to a state in which the amount of generated power exceeds the amount of power consumed by the load 13 and power is sold to the grid power 90.

  The fee A is input to the first fee server 18. The first fee server 18 charges the fee A to the second fee server 19. On the other hand, the fee B is input to the second fee server 19. The second fee server 19 calculates a fee C that is a fee charged to the general user 1 based on the fee B and the land use fee paid to the general user 1.

  In the present embodiment, the land use fee is calculated based on the installation time of the stationary storage battery 10 and the land use fee unit price. That is, the fee C can be calculated by the following equation (3). In addition, when the storage battery manufacturer 3 provides the storage battery 10 to the general user 1 by paid rental, the charge C may be calculated in consideration of the rental fee paid by the general user 1 to the storage battery manufacturer 3.

  The storage battery manufacturer 3 that owns the second fee server 19 pays the electric utility 2 with the fee A charged by the first fee server 18. That is, the difference obtained by subtracting the charge A from the charge C can be used as the company's profit.

  According to this embodiment described above, charging can be performed based on the amount of electricity saved due to the introduction of the stationary storage battery 10 and the solar battery 20. Conventionally, only “the actual electricity charge (charge A)” was calculated, but in the present embodiment, “the stationary storage battery 10 and the solar battery 20 are not introduced by adding the constituent element of the broken line α. "Estimated electricity bill (fee B)". A fee C is calculated by taking into account the land use fee and the like, and this is the basis for charging the general user 1.

  For this reason, the general user 1 is given an incentive of land revenue. In addition, the storage battery manufacturer 3 can continuously obtain a saving electricity charge (fee B-charge A) instead of obtaining the sales price of the stationary storage battery 10. Accordingly, it is possible to promote the spread of the stationary storage battery 10 without forcing the general user 1 to bear the entire initial equipment cost, thereby contributing to the leveling of power consumption.

Second Embodiment
Next, a second embodiment of the present invention will be described.

  FIG. 4 is a block diagram showing a system configuration of the power trading system according to the second embodiment of the present invention. As in the first embodiment, the storage battery manufacturer 3 pays land use fees to the general user 1 and provides the stationary storage battery 10.

  As a point different from the first embodiment, the general user 1 pays a saving electricity fee to the storage battery manufacturer 3 instead of a virtual electricity fee. Further, the general user 1 pays an actual electricity charge to the electric power company 2.

  FIG. 5 is a block diagram illustrating a power trading device that the general user 1, the electric power company 2, and the storage battery manufacturer 3 have, as in FIG. 3 of the first embodiment. In the power trading system of this embodiment, the electric power company 2 charges the charge A to the general user 1. The fee D calculated by the second fee server 19 and charged to the general user 1 can be calculated by the following equation (4).

  According to the present embodiment described above, since the creditor and the billing person are the same, when the payment of the general user 1 is delayed, there are various problems caused by the difference between the creditor and the billing person. There is nothing.

<Embodiment 3>
Next, a third embodiment of the present invention will be described.

  FIG. 6 is a block diagram showing a system configuration of the power trading system according to the third embodiment of the present invention. As a difference from the first embodiment, the electric power company 2 provides the stationary user storage battery 10 to the general user 1 free of charge, or at a price discounted from the normal initial installation cost. Paid rental and pay land use fee. The general user 1 pays a virtual electricity fee to the electric power company 2.

  FIG. 7 is a block diagram showing a power trading device of the general user 1, the electric power company 2, and the storage battery manufacturer 3 as in FIG. 3 of the first embodiment. In the power trading system of the present embodiment, the first fee server 18 of the electric power company 2 charges the fee C for the general user 1.

  In the electricity trading system of the present embodiment, the storage battery manufacturer 3 does not enter, and the electric power company 2 performs the proxy installation of the stationary storage battery 10 instead of the storage battery manufacturer 3. Accordingly, the general user 1 is charged only from the first fee server 18. The land usage fee is input to the first fee server 18.

  According to this embodiment described above, the general user 1 can pay only once. Moreover, when a user's payment is overdue, the electric power provider 2 can take measures such as interrupting the power supply to the general user 1.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described.

  FIG. 8 is a block diagram showing a system configuration of a power trading system according to the fourth embodiment of the present invention. Similar to the second embodiment, the storage battery manufacturer 3 pays a land use fee and provides the stationary storage battery 10 to the general user 1. Further, the general user 1 pays a saving electricity fee to the storage battery manufacturer 3. Further, the general user 1 pays an actual electricity charge to the electric power company 2.

  FIG. 9 is a block diagram illustrating a power trading device included in the general user 1, the electric power company 2, and the storage battery manufacturer 3, as in FIG. 5 of the second embodiment. The power trading system of the present embodiment is different from the second embodiment in that a fourth wattmeter 21 is provided.

  In the present embodiment, the first power line coming out of the stationary storage battery 10 is a second power line that connects the load 13 and the system power 90 via the power conditioner 11 that performs A / D conversion and the fourth power meter 21. To join. On the second power line, the first wattmeter 12 is disposed on the grid power 90 side as viewed from the merging point, and the second wattmeter 14 is disposed on the load 13 side as viewed from the merging point. In addition, a third wattmeter 15 is disposed on a third power line connecting the power conditioner 11 and the solar battery 20.

  With the above configuration, the fourth wattmeter 21 includes the power supplied from the power conditioner 11 to the stationary storage battery 10 (= charging power) and the power supplied from the stationary storage battery 10 to the load 13 (= discharge power). Both can be measured.

  The power data B3 (= fourth power data) indicating the above two powers is input to the second arithmetic storage device 17, and the fee E is calculated. In the power data B3, the direction from the stationary storage battery 10 to the power conditioner 11 is positive (discharge), and the reverse direction is negative (charge). The second arithmetic storage device 17 calculates a charge E, which is a saved electricity charge, based on the power data B1 to B3.

  The charge E is a difference obtained by subtracting the actual electricity charge (charge X) in the present embodiment from the virtual electricity charge (charge B). The fee B is calculated by the equation (2) in the first embodiment. For example, as a method of calculating the charge X, first, the product of the power data B3 reflecting the power discharged from the storage battery 10 and the inverter efficiency η3 is subtracted from the power data B1 reflecting the power consumed by the load 13. Then, the product of the power data B2 reflecting the power generated by the solar cell 20 and the inverter efficiency η2 is further subtracted from the subtracted power. The contract basic charge is added to the product of the power calculated as a result of this and the product of the power unit price at the time when this power was measured, integrated over time. Thereby, the charge X is calculated.

  That is, for example, it can be calculated by the following equation (5). However, the charge X is obtained by subtracting the product of the power data B3 and the A / D conversion efficiency η3 and the product of the power data B2 and the A / D conversion efficiency η2 and the power data from the power data B1. What is necessary is just to be calculated based on the electric energy unit price at the measured time, and is not limited to the equation (5).

  Note that B1, B2, and B3 in the equation (5) indicate power data B1, B2, and B3. In addition, η2 included in the equation (5) is the A / D conversion efficiency of the solar cell-derived power to the AC power in the input power from the solar battery 20 to the power conditioner 11 and the input power from the storage battery 10 to the power conditioner 11. Is shown. Similarly, η3 indicates the A / D conversion efficiency from the storage battery-derived power to the AC power in the input power from the solar battery 20 to the power conditioner 11 and the input power from the storage battery 10 to the power conditioner 11. The unit price of electric power included in the equation (5) is switched depending on whether the power data is positive or negative. In response to this, the unit price table used by the second arithmetic storage device 17 is also switched between for power sale and for power purchase.

  More specifically, when the value in the brackets (the portion surrounded by “{” and “}”) is positive, the power is purchased, and when it is negative, the power is sold. In the positive case, the second arithmetic storage device 17 determines the unit price of the electric energy using the unit price table for power purchase. On the other hand, in the negative case, the second arithmetic storage device 17 determines the unit price of the electric energy using the unit price table for power sale.

  When the power obtained by subtracting the product of the power data B3 and the A / D conversion efficiency η3 and the product of the power data B2 and the A / D conversion efficiency η2 from the power data B1 is positive, the discharge amount of the stationary storage battery 10 And the amount of discharge of the solar cell 20 are less than the power consumption of the load 13, which corresponds to a state where power is purchased from the system power 90. On the other hand, when the power obtained by subtracting the product of the power data B3 and the A / D conversion efficiency η3 and the product of the power data B2 and the A / D conversion efficiency η2 from the power data B1 is negative, the stationary storage battery 10 Since the discharge amount and the discharge amount of the solar battery 20 exceed the power consumption of the load 13, this corresponds to a state where power is sold to the system power 90.

  If no reverse flow from the stationary storage battery 10 to the grid power 90 is recognized in the system, the power obtained by subtracting the product of the power data B2 and the A / D conversion efficiency η2 from the power data B1 is the power data B3. The amount of discharge of the stationary storage battery 10 is controlled by the power conditioner 11 so as not to be smaller than the discharge power of the stationary power calculated by the product of the A / D conversion efficiency η3.

  The charge D calculated by the second arithmetic storage device 17 and charged to the general user 1 can be calculated by the following equation (6).

  According to this embodiment described above, the owner of the second fee server 19 can determine the fee to be charged to the general user 1 without using the information (fee A) derived from the first wattmeter 12. For this reason, even if the owner of the first wattmeter 12 and the owner of the second fee server 19 are different and it is difficult to share information, the fee D can be independently charged without relying on the other information held. You can charge.

<Embodiment 5>
Next, a fifth embodiment of the present invention will be described.

  FIG. 10 is a block diagram showing a system configuration of a power trading system according to the fifth embodiment of the present invention. As in the first embodiment, the storage battery manufacturer 3 pays land use fees to the general user 1 and provides the stationary storage battery 10. Further, the general user 1 pays a saving electricity fee to the storage battery manufacturer 3. Further, the general user 1 pays an actual electricity charge to the electric power company 2.

  FIG. 11 is a block diagram showing an apparatus for power trading that the general user 1, the electric power company 2, and the storage battery manufacturer 3 have as in FIG. 3 of the first embodiment. The power trading system of the present embodiment assumes a case in which the amount of solar power generated is not pushed up by installing the stationary storage battery 10.

  Pushing up means reducing the consumption of electric power derived from photovoltaic power generation and increasing the amount of electric power sold by using the electric power of the stationary storage battery 10 during the day. When the push-up is not performed, the savings due to the installation of the stationary storage battery 10 is only a method of using the difference between the electricity charges during the daytime and the nighttime.

  For this reason, in this embodiment, it is set as the structure which can calculate a saving electricity bill only by arrange | positioning the 4th wattmeter 21 only between the power conditioner 11 and the stationary storage battery 10. FIG. The power conditioner 11 performs the control for preventing the push-up, that is, the discharge prohibition control for the stationary storage battery 10 during the power generation of the solar battery 20.

  The fourth wattmeter 21 can measure both the power supplied to the stationary storage battery 10 and the power supplied from the stationary storage battery 10 to the load 13. The power data B3 indicating the above two powers is input to the second arithmetic storage device 17, and the fee F is calculated. For this reason, the charge F, which is a saved electricity charge, can be calculated by the following equation (7).

  Similar to equation (5), η3 indicates A / D conversion efficiency. The unit price of electric power is switched depending on whether the power data B3 is positive or negative. In response to this, the unit price table used by the second arithmetic storage device 17 is also switched between for power sale and for power purchase.

  The charge D calculated by the second arithmetic storage device 17 of this embodiment and charged to the general user 1 can be calculated by the following equation (8).

  According to the present embodiment described above, it is possible to charge the general user 1 who does not push up the power sales amount of solar power generation based on the saved electricity charge.

  In the first to fifth embodiments described above, it is assumed that charging from the solar cell 20 to the storage battery 10 is not performed, and the power derived from the solar cell is supplied to the load 13 or the system power supply 90. . On the other hand, when the reverse power flow from the solar cell 20 to the grid power 90 is not performed, and the charging from the solar cell 20 to the storage battery 10 is performed, the reverse power flow from the solar cell 20 to the grid power 90 is performed and When performing charging, etc., it can be assumed, but in that case, in accordance with each embodiment, based on the power data measured by the first to fourth wattmeters, a saving electricity bill is calculated, Billing based on that may be performed.

<Embodiment 6>
Next, a sixth embodiment of the present invention will be described.

  FIG. 12 is a block diagram showing a system configuration of an electric power trading system according to the sixth embodiment of the present invention. The storage battery manufacturer 3 pays a land use fee to the general user 1 and provides the stationary storage battery 10 and the solar battery 20. The general user 1 pays a virtual electricity fee to the storage battery manufacturer 3. Further, the storage battery manufacturer 3 pays an actual electricity charge to the electric power company 2.

  FIG. 13 is a block diagram illustrating a power trading device that the general user 1, the electric power company 2, and the storage battery manufacturer 3 have, as in FIG. 3 of the first embodiment. The power trading system of the present embodiment assumes a case where the general user 1 lends land to both the stationary storage battery 10 and the solar battery 20.

  Charge A, which is an actual electricity charge, is calculated by the expression (1) in the first embodiment. On the other hand, the charge G which is a virtual electricity charge when the stationary storage battery 10 and the solar battery 20 are not installed can be calculated by the following equation (9).

  The fee A is input to the first fee server 18 and the fee A is charged to the second fee server 19. The fee G is input to the twelfth fee server 19. The second fee server 19 calculates a fee C, which is a fee charged to the general user 1, based on the fee G, the installation time of the general user 1, and the land use fee unit price. In the present embodiment, the land usage fee is calculated based on the total installation time, which is the sum of the installation time of the stationary storage battery 10 and the installation time of the solar cell 20, and the land usage fee unit price. That is, the charge C of this embodiment can be calculated by the following equation (10).

  The storage battery manufacturer 3 that owns the second fee server 19 pays the electric utility 2 with the fee A charged by the first fee server 18. That is, the difference obtained by subtracting the charge A from the charge G can be used as the company's profit.

  According to the present embodiment described above, the general user 1 can receive an incentive by installing the solar battery 20 in addition to the incentive by installing the stationary storage battery 10.

In addition, the storage battery manufacturer 3 can continuously obtain a saving electricity charge instead of obtaining the sales price of the stationary storage battery 10 and the solar battery 20. Therefore, the spread of the stationary storage battery 10 and the solar battery 20 can be promoted without imposing a burden on the initial equipment cost on the general user 1.
[Other embodiments]

  The present invention has been described with reference to the preferred embodiments and examples. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea. be able to.

  Therefore, the present invention can also be applied to the following embodiments.

  (A) In the above embodiment, the unit price table is stored in the arithmetic storage device, but is recorded in another device (for example, a database server connected to the network) and referred to via the communication network. Good. Moreover, the form which uses a real-time charge without using a unit price table, that is, the form which refers to the electric energy unit price information which fluctuates in real time every time via a communication network may be used.

  (B) In the above embodiment, the wattmeter is installed in each home, and the information is received by a fee server installed in another location. However, it is not always necessary that these components are separated. No. In other words, a configuration may be used in which a wattmeter and a charge server are integrated to calculate a charge for charging based on power data. In this case, the configuration requirements are reduced and the cost can be reduced. In addition, the number of failure points is reduced and the reliability of the system is improved.

  (C) In the above embodiment, the arithmetic storage device and the fee server are separate devices, but an embodiment in which these are integrated may be used. That is, an apparatus that calculates and charges a fee based on power data and power unit price information only needs to be included in the configuration requirements in some form.

  (D) In the above embodiment, the power conditioner 11, the second wattmeter 12, the third wattmeter 14, and the large four wattmeter 21 are separate devices. However, a configuration in which these are integrated may be used. Thereby, since the A / D conversion efficiency can be measured simultaneously with the power measurement, the A / D conversion efficiency table becomes unnecessary, and the accuracy of the charge calculation is improved. In addition, the component cost can be reduced.

  (E) In the above-described embodiment, the A / D conversion efficiency is determined using the A / D conversion efficiency table. However, the actual measurement time may be used instead of the table.

  (F) In the said embodiment, although the solar cell 20 is illustrated as a power converter device which converts natural energy into electric power, the form using another power converter device may be sufficient. For example, a configuration using a wind power generator that converts wind energy into electric power, a hydroelectric generator that converts hydro energy into electric power, or a geothermal power generator that converts geothermal energy into electric power may be used.

(G) In the above embodiment, it is assumed that the stationary storage battery 10 and the solar battery 20 are introduced for each home of the general user 1, but the plurality of general users 1 are set as one unit (for example, an apartment unit or a town unit). ), The stationary storage battery 10 and the solar battery 20 may be introduced. However, in this embodiment, it is desirable to implement the measures taking the following contents into consideration.
When installing one stationary storage battery 10 for a plurality of general users 1, it is necessary to charge according to the actual electricity usage of each general user 1. Since the electricity charges saved by each general user 1 are different for each general user 1, pay-as-you-go is required. For this purpose, it is necessary to install a wattmeter for each general user 1.
-The stationary storage battery 10 and the solar battery 20 required for a single general user 1 can be installed in idle land (small land such as a garden) owned by the general user 1, but one general user 1 is a unit. In the case where the stationary storage battery 10 and the solar battery 20 are installed, a large capacity land is required because the stationary storage battery 10 and the solar battery 20 having a large capacity are required. In general, a land lease contract for a small land is more likely to be established and the present invention is easier to apply.
[Operations and effects of the present invention]

  The power trading system according to the present invention transfers power between a power conversion device (20) that converts energy obtained from nature into power and the power conversion device (20) or a commercial AC power supply (90). A storage battery (10) that performs charging / discharging, a load (13) that receives power supply from the power converter (20) or the commercial AC power supply (90) or the storage battery (10), and the commercial AC power supply (90) To measure the power supplied to the load (13) or the storage battery (10) and the power supplied from the storage battery (10) or the power converter (20) to the commercial AC power supply (90). 1 wattmeter (12) and second power for measuring power supplied from the commercial AC power supply (90), the storage battery (10), or the power converter (20) to the load (13) A meter (14), a third power meter (15) for measuring the power supplied from the power converter (20) to the load (13) or the storage battery (10), and the first power meter (12) The first power data indicating the power measured by the second power meter, the second power data indicating the power measured by the second power meter (14), and the third power indicating the power measured by the third power meter (15). And an arithmetic unit (16, 17) for calculating an electricity bill charged to the user (1) of the storage battery (10) according to the power data.

  According to said structure, from the electric power measured by the 1st wattmeter 12, ie, the electric power purchased from the system power supply 90 to the storage battery (10) or load (13), and the storage battery (10) or the power converter device (20). Electricity bill charged to the general user 1 based on the power sold to the commercial AC power supply (90) and the power measured by the second wattmeter 14 and the third wattmeter 15, that is, the power consumed by the load 13 To decide. For this reason, virtual power consumption when it is assumed that the stationary storage battery 10 has not been introduced can be used as a basis for charging.

  Further, in the power trading system according to the present invention, the computing devices (16, 17) are based on the power indicated by the first power data and the unit price of electric power determined in advance according to the measurement time of the power. , Calculating a first electricity bill that is an electricity bill based on the power exchanged with the commercial AC power supply (90), and the arithmetic unit (16, 17) calculates the power indicated by the second power data and the power Based on the power supplied to the load (13) based on the differential power that is the difference between the power indicated by the third power data and the unit price of power determined in advance according to the measurement time of the differential power. A second electricity charge that is an electricity charge is calculated.

  According to said structure, based on the 1st electricity rate which is an actual electricity rate, and the 2nd electricity rate which is an electricity rate at the time of assuming that the stationary storage battery 10 and the solar cell 20 were not introduce | transduced, it charges It can be performed.

  In the power trading system according to the present invention, the arithmetic device (16, 17) may calculate the difference power according to the DC / AC conversion efficiency of the power obtained by the power conversion device (20). It is characterized by calculating electric power.

  According to said structure, the difference electric power is calculated in consideration of the conversion efficiency at the time of carrying out DC / AC conversion of the electric power obtained from the solar cell 20. FIG. As a result, more accurate differential power can be calculated.

  Further, the power trading system according to the present invention charges the user (1) of the storage battery (10) based on the first electric charge or the second electric charge, and uses the money obtained by the charging as the charge. It has a charge server (18, 19) distributed to the provider (3) of the storage battery (10) or the electric utility (2) that provides the commercial AC power supply (90).

  According to said structure, the electric power company 2 and the storage battery manufacturer 3 can charge with respect to the general user 1 separately.

  In the power trading system according to the present invention, when the charge server (18, 19) charges the user (1), the user (1) who installed the storage battery (10) It is characterized by subtracting a consideration fee which is a fee obtained as a consideration for the installation.

  According to said structure, the general user 1 which introduces the stationary storage battery 10 and the solar cell 20 can obtain the price by lending the land for installing the stationary storage battery 10 to the storage battery manufacturer 3. .

  In the power trading system according to the present invention, the charge server (18, 19) includes a first charge server (18) possessed by the electric utility (2) and a second charge server possessed by the provider (3). The first charge server (18) charges the first electricity charge to the second charge server (19), and the second charge server (19) The person (1) is charged with the second electricity charge.

  According to the above configuration, the storage battery manufacturer 3 can continuously obtain the difference between the second electricity charge and the first electricity charge instead of obtaining the sales price of the stationary storage battery 10. Therefore, the spread of the stationary storage battery 10 can be promoted without imposing a burden on the initial equipment cost on the general user 1.

  In the power trading system according to the present invention, the charge server (18, 19) includes a first charge server (18) possessed by the electric utility (2) and a second charge server possessed by the provider (3). (19), the first charge server (18) charges the user (1) with the first electricity charge, and the second charge server (19) For 1), a saving electricity charge which is a charge obtained by subtracting the first electricity charge from the second electricity charge is charged.

  According to the above configuration, since the creditor and the biller are the same, when the payment of the general user 1 is delayed, various problems caused by the difference between the creditor and the biller do not occur.

  In the power trading system according to the present invention, the charge server (18, 19) includes a first charge server (18) included in the electric power company (2), and the first charge server (18) The second electric charge is charged to the user (1).

  According to the above configuration, the general user 1 needs to pay only once. Moreover, when a user's payment is overdue, the electric power provider 2 can take measures such as interrupting the power supply to the general user 1.

  Moreover, the power trading system according to the present invention has a fourth wattmeter (21) provided between the connection node of the commercial AC power source (90) and the load (13) and the storage battery (10), The fourth wattmeter (21) includes charging power supplied from the commercial AC power supply (90) or the power converter (20) to the storage battery (10), and from the storage battery (10) to the load (13). Alternatively, the discharge power supplied to the commercial AC power supply (90) is measured to generate fourth power data indicating the charge power and the discharge power, and the arithmetic devices (16, 17) are configured to output the second power data. The second electric charge is calculated based on the electric power indicated by the third electric power data and the fourth electric power data and a unit price of electric power determined in advance according to the measurement time of the electric power. And

  According to said structure, it pushes up with respect to the general user 1 which is using the electric power of the storage battery 10 for stationary use in the daytime, reduces the consumption of the electric power derived from photovoltaic power generation, and increases the amount of power sales. It is possible to charge based on virtual electricity charges considering the above.

  Moreover, the power trading system according to the present invention has a fourth wattmeter (21) provided between the connection node of the commercial AC power source (90) and the load (13) and the storage battery (10), The fourth wattmeter (21) measures charge power supplied from the commercial AC power supply (90) to the storage battery (10) and discharge power supplied from the storage battery (10) to the load (13). Then, the fourth power data indicating the charging power and the discharging power is generated, and the arithmetic devices (16, 17) are predetermined according to the power indicated by the fourth power data and the measurement time of the power. The second electricity rate is calculated based on the unit price of electric power.

  According to the configuration described above, it is possible to charge the general user 1 who has not performed the above-described push-up based on a virtual electricity bill that does not consider the push-up.

  Further, in the power trading system according to the present invention, the computing devices (16, 17) are based on the power indicated by the second power data and a power unit price determined in advance according to the measurement time of the power. The second electricity charge is calculated, and the second charge server (19) installs the storage battery (10) and the power conversion device (20) when charging the user (1). The user (1) is charged by subtracting a consideration fee which is a fee obtained as a consideration for the installation.

  According to said structure, the general user 1 can receive the incentive by installing the solar cell 20 in addition to the incentive by installing the storage battery 10 for stationary.

  In the power trading system according to the present invention, the computing devices (16, 17) include computation information for calculating the first electricity rate or the second electricity rate based on the unit price of power. Features.

  According to said structure, an electricity bill can be easily calculated using the unit price table previously stored in the arithmetic unit.

  The power trading system according to the present invention is provided between the first wattmeter (12), the second wattmeter (14), the third wattmeter (15), and the storage battery (10). And a power conditioner (11) for converting and adjusting current.

  According to said structure, according to said structure, by using the power conditioner 11, AC / DC conversion, prevention of a reverse power flow, current limitation, etc. can be performed suitably.

  Further, in the power trading system according to the present invention, the power conversion device (20) includes a solar power generation device (20) that converts solar energy into electric power, a wind power generation device that converts wind energy into electric power, and hydroelectric energy as electric power. It is a hydroelectric power generation device that converts or a geothermal power generation device that converts geothermal energy into electric power.

  According to said structure, it is possible to implement this invention using the power converter device using natural energy.

1 General user (user)
2 Electricity companies 3 Storage battery manufacturers (providers)
10 Stationary storage battery (storage battery)
11 Power conditioner (power conditioner)
12 1st wattmeter 13 load 14 2nd wattmeter 15 3rd wattmeter 16 1st arithmetic storage device (arithmetic unit)
17 Second arithmetic storage device (arithmetic unit)
18 1st charge server 19 2nd charge server 20 Solar cell (power converter)
21 4th power meter 90 Grid power (commercial AC power supply)
DESCRIPTION OF SYMBOLS 101 General user 102 Electric power supplier 103 Storage battery manufacturer 110 Stationary storage battery 111 Power conditioner 112 1st power meter 113 Load 120 Solar cell 190 System power

Claims (5)

A power conversion device that converts energy obtained from nature into electric power;
A storage battery that performs charge and discharge by transferring power to and from the power converter or commercial AC power supply;
A load that receives power supply from the power converter or the commercial AC power source or the storage battery;
A first wattmeter that measures power supplied from the commercial AC power source to the load or the storage battery, and power supplied from the storage battery or the power converter to the commercial AC power source;
A second wattmeter that measures the power supplied from the commercial AC power source, the storage battery, or the power converter to the load;
A third wattmeter that measures power supplied from the power converter to the load or the storage battery;
First power data indicating power measured by the first power meter, second power data indicating power measured by the second power meter, and third power indicating power measured by the third power meter An electric power trading system comprising: an arithmetic unit that calculates an electricity bill charged to a user of the storage battery according to data. The computing device is based on the power exchanged with the commercial AC power source based on the power indicated by the first power data and the unit price of power determined in advance according to the measurement time of the power. Calculate the first electricity charge, which is the electricity charge,
The arithmetic device may calculate a difference power that is a difference between the power indicated by the second power data and the power indicated by the third power data, and a power unit price determined in advance according to the measurement time of the difference power. And calculating a second electricity charge that is an electricity charge based on the power supplied to the load,
The power trading system according to claim 1, wherein, in the calculation of the differential power, the arithmetic device calculates the differential power according to direct current / alternating current conversion efficiency of power obtained by the power conversion device. . Based on the first electricity charge or the second electricity charge, the user of the storage battery is charged, and the money obtained by the charging is supplied to the provider of the storage battery or the electric utility providing the commercial AC power supply. The power trading system according to claim 2, further comprising a charge server for distribution. The billing server, when billing the user, bills by subtracting a billing fee, which is a fee that the user installing the storage battery obtains as a bill for the installation. 3. The power trading system according to 3. The charge server includes a first charge server possessed by the electric utility and a second charge server possessed by the provider,
The first charge server charges the first electricity charge to the second charge server;
The power trading system according to any one of claims 1 to 4, wherein the second fee server charges the second electricity fee to the user.

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