JP5263808B2 - Power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generation system that prevents the unauthorized use of power without permission by connection of an electric load to the power generation system, while preventing forcing of working burden on a manager of the power generation system. <P>SOLUTION: The power generation system 1 includes: a solar cell module 2; a power conversion unit 3 for converting DC power from the solar cell module 2 into AC power; a distribution board 5 for connecting the power conversion unit 3 to a commercial power system 4; a dedicated outlet 6 to be used for connecting an electric load 9 in the power generation system 1 and using the power; a control section 7 connected between the distribution board 5 and the dedicated outlet 6 and controlling so that the power is supplied to the dedicated outlet 6 depending on excessive power amount and the supply is interrupted; and a metering section 8 for metering the power reversely flowing from the power generation system 1 to the commercial power system 4. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a power generation system. In particular, the present invention relates to a technology for permitting and prohibiting supply in a power generation system that supplies power to a commercial power system when the necessity of power supply occurs in a general electric load.

  Solar cells and wind power generators are known as simple and clean energy sources that use natural energy to output DC power and do not emit global warming gases. In particular, a solar power generation system in which a solar cell is installed on the roof or site of an existing building is known as an energy source as described above. In this power generation system, the obtained direct current power is converted into alternating current power, connected to a commercial power system, and the power generated by reverse flow is sold to an electric power company.

  FIG. 5 is a diagram illustrating an example of a photovoltaic power generation system. Referring to FIG. 5, a photovoltaic power generation system 101 includes a solar cell module 102, a power conversion unit 103 that converts DC power into AC power, a commercial power system 104, a power conversion unit 103, and a commercial power system 104. The distribution board 105 for connecting the power generation unit and a measuring unit 108 for measuring the amount of power generated by the power generation system 101 are provided.

  In the power generation system 101, when there is solar radiation, the DC power from the solar cell module 102 is converted into AC power by the power conversion unit 103, and reversely flows to the commercial power system 104 via the distribution board 105. In this way, the manager of the power generation system can obtain profits by selling all the power generated based on the amount of power measured by the measuring unit 108 to the power company. For example, when the installation cost of the solar power generation system is solicited, the profit is returned to the investor of the power generation system.

  In such a power generation system, all the generated power is sold to an electric power company, and the profit is returned to the investor of the power generation system. However, if electric power is used by connecting an electric load in the power generation system without permission from the manager of the power generation system, the amount of power originally sold to the power company is reduced, and there is a risk that the profit from the sale will be reduced. In addition, when the power generation system is not generating power, if an electric load is connected to the power generation system and electric power is used, electric power from the commercial power system is used, so there is a risk of generating global warming gas from the power generation system .

Therefore, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4 propose devices for preventing theft. Thereby, it can prevent that electric power is used without the administrator of a power generation system. Moreover, since it can prevent using the electric power from a commercial power grid | system, generation | occurrence | production of the global warming gas from a power generation system can be suppressed.
Japanese Patent Laid-Open No. 11-194140 JP 2003-21649 A Japanese Utility Model Publication No. 2-119369 Utility model 3097566

  However, in the techniques proposed in Patent Document 1, Patent Document 3, and Patent Document 4, a cover that covers the connection portion is attached to the connection portion so that an electrical load cannot be physically connected to the power generation system. It will be necessary. In the technique proposed in Patent Document 2, it is necessary to attach a terminal for detecting theft to each power line that supplies power. For this reason, the manager of the power generation system has a burden of installation work.

  Further, if the electrical load cannot be physically connected, it becomes difficult to use the power even in an emergency where the electrical load must be connected and the power must be used.

  The present invention has been made to solve the above-described problems, and its purpose is to connect an electric load in the power generation system without imposing a work burden on the administrator of the power generation system. An object of the present invention is to provide a power generation system that can prevent the use of electric power.

According to one aspect of the present invention, a power generation system connects a power generation unit that is a DC power source, a power conversion unit for converting a DC current from the power generation unit into an AC current, a power conversion unit, and a commercial power system. And a control unit for controlling the power supply from the power generation unit in accordance with the power amount value of the surplus power data for the electrical load outlet connected to the connection unit. The control unit includes a storage unit for recording surplus power data, a connection blocking unit that allows or prohibits power supply to the electrical load outlet, a connection cutoff command unit that controls the connection blocking unit, and an electrical load outlet. A power consumption amount measuring unit for measuring the power consumption amount of the electric load connected to the power source, and a power amount comparison unit for comparing the power generation amount by the power generation unit and the power consumption amount of the electric load. The connection cutoff command unit determines whether or not power supply to the electrical load outlet is permitted for a user who uses the electrical load . When power supply to the electrical load outlet is permitted for the user, the power amount comparison unit determines whether or not the generated power amount is greater than zero. The connection cutoff command unit instructs the connection cutoff unit to prohibit supplying power to the electrical load outlet in response to the determination that the power generation amount is not greater than zero. . The connection cut-off command unit instructs the connection cut-off unit to permit the supply of electric power to the electrical load outlet when the power amount comparison unit determines that the generated power amount is greater than zero. When the power amount comparison unit determines that the generated power amount is greater than zero and the generated power amount is greater than the power consumption amount of the electrical load measured by the power consumption amount measuring unit, the generated power amount Is added to the power amount value of surplus power data and recorded in the storage unit. When the power amount comparison unit determines that the generated power amount is greater than zero, the generated power amount is not greater than the consumed power amount, and the power amount value of the surplus power data is greater than zero. The power amount obtained by subtracting the generated power amount from the power consumption amount is subtracted from the power amount value of the surplus power data and recorded in the storage unit. In the connection cutoff command unit, the power amount comparison unit is such that the generated power amount is greater than zero, the generated power amount is not greater than the consumed power amount, and the surplus power data has a power amount value less than zero. In response to determining that it is not large, the connection cut-off unit is further instructed to prohibit power supply to the electrical load outlet.

Preferably, the storage unit, the power consumption of the electrical load which is weighed by power consumption measuring section to memorize, calculates the price based on the stored power consumption.

  Preferably, the direct current power source is a solar cell.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent using an electric load by connecting an electric load in a power generation system without an administrator of a power generation system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

FIG. 1 is a diagram showing a power generation system in the present embodiment.
With reference to FIG. 1, a power generation system using a solar cell as a DC power source according to the present embodiment will be described.

  The power generation system 1 includes a solar cell module 2, a power conversion unit 3 for exchanging DC power from the solar cell module 2 to AC power, and a distribution board 5 that connects the power conversion unit 3 and the commercial power system 4. And the dedicated outlet 6 used when the electric load 9 is connected in the power generation system 1 to use the power, and the distribution board 5 and the dedicated outlet 6 are connected to supply power to the dedicated outlet 6. Or a control unit 7 that performs control for prohibiting supply, and a measuring unit 8 that measures the power that the power generation system 1 flows backward to the commercial power system 4. The power conversion unit 3 includes an AC power detection unit 3a for detecting output power from the power conversion unit 3. The dedicated outlet 6 is provided with a switch 6a. Then, the outlet plug 9 a of the electric load 9 is inserted into the dedicated outlet 6.

FIG. 2 is a view showing the front and side of the dedicated outlet 6.
Referring to FIG. 2, the dedicated outlet 6 is provided with a protruding switch 6a as shown in FIG. When the outlet plug 9a (see FIG. 1) of the electric load 9 is inserted into the dedicated outlet 6, the protruding switch 6a is pushed by the outlet plug 9a and the switch 6a is turned on. On the other hand, when the outlet plug 9a of the electric load 9 is pulled out from the dedicated outlet 6, the protruding switch 6a is not pushed by the outlet plug 9a, so the switch 6a returns to the original state and is turned off.

  Returning to FIG. 1, the power generation system 1 has 100 solar cell modules 2 (for example, a rating of 123 W per sheet, an open voltage of 21.3 V) provided by an investor on a roof or a site that is an empty space of an existing building. Installed with funds provided. The DC power generated by the solar cell module 2 is converted into AC power (for example, a maximum of about 10 kW) by the power conversion unit 3. Then, the power generated by the reverse power flow to the commercial power system 4 via the distribution board 5 and sold to the electric power company is sold. The manager of the power generation system 1 measures the generated power with the measuring unit 8 determined by the contract with the electric power company when the generated power flows backward to the commercial power system 4, and the profit obtained by selling the generated power To the investor.

FIG. 3 is a functional block diagram of the control unit 7.
The function of the control unit 7 will be described with reference to FIG.

  The control unit 7 includes an electric load connection detecting unit 10 for detecting whether or not the electric load 9 is connected to the dedicated outlet 6, and a generated power amount receiving unit for receiving a signal from the AC power detecting unit 3a. 11, a power consumption metering unit 12 for measuring the power consumption amount consumed by the electrical load 9 connected to the dedicated outlet 6, and a power consumption and power consumption metering unit 12 received by the generated power reception unit 11. Comparison of the electric energy comparison unit 13 for comparing the measured electric energy, the connection blocking unit 14 for connecting or disconnecting the dedicated outlet 6 and the distribution board 5, and the electric energy comparison unit 13. Based on the result, the surplus power amount storage unit 15 for storing the surplus power amount, the power consumption amount storage unit 16 for storing the power consumption amount measured by the power consumption amount measurement unit 12, and the power amount comparison unit 13 And electrical load connection inspection Based on a signal from the unit 10, a connection cutoff command unit 17 for sending a control signal to the connection cutoff unit 14 and a display unit 18 for displaying generated power by a signal from the generated power amount receiving unit 11 are included. .

  The surplus power amount storage unit 15 subtracts the power consumption amount from the generated power amount when the power amount comparison unit 13 determines that the generated power amount is larger as a result of comparing the generated power amount and the consumed power amount. The power amount difference (hereinafter referred to as “surplus power amount R1”) is added to the stored power amount (hereinafter referred to as “surplus power data”). On the other hand, when it is determined that the amount of power consumption is larger, a power amount difference obtained by subtracting the generated power amount from the power consumption amount (hereinafter referred to as “surplus power amount R2”) is subtracted from the surplus power data. Here, the surplus power storage unit 15 may store the power amount value as described above, or a value converted to other than the power amount value (for example, according to the surplus power amount such as a usage fee or points). Data) may be stored.

  The administrator of the power generation system 1 can set in advance whether or not to allow the user to connect an electric load to the power generation system 1. When connection is not permitted, power is not supplied to the electric load. In addition, as a method for the user to obtain permission from the manager of the power generation system 1 to use the generated power, a method using a permission key or a permission card can be considered. Thereby, it can prevent using the generated electric power of a power generation system without an administrator's permission.

Below, operation | movement in the electric power generation system 1 of the above structures is demonstrated.
In the power generation system 1, when sunlight hits the solar cell module 2 at daytime and the solar radiation intensity is sufficient, the power conversion unit 3 converts the DC power from the solar cell module 2 into AC power. Then, the generated power is reversely flowed to the commercial power system 4 via the distribution board 5 and sold to the power company. In this case, if the electrical load 9 permitted by the administrator is connected, the generated power or the power from the commercial power system is supplied to the electrical load 9 as long as the total amount of generated power exceeds the total power consumption. . In addition, the user connected to the electrical load 9 pays the administrator a price corresponding to the amount of power consumed.

  On the other hand, when the solar cell module 2 is not exposed to sunlight, such as at night or in rainy weather, the power generation system 1 does not generate power and does not reversely flow into the commercial power system 4, so that no profit can be obtained by selling the generated power. In this case, power supply from the commercial power system 4 is not performed even if the electrical load 9 permitted by the administrator is connected.

  By such an operation, it is possible to prevent a decrease in gain on sale due to power consumption. In addition, as described above, when power is generated in the power generation system 1, if power is supplied until the total generated power and the total power consumption are offset, the power from the commercial power system is Even if it is used, generation of global warming gas from the power generation system 1 can be suppressed.

FIG. 4 is a flowchart showing the operation of the power generation system 1.
The operation of the power generation system 1 will be specifically described with reference to FIG. In addition, this flowchart is only an example of the operation of the power generation system 1, and may be executed by exchanging steps, for example.

  First, in step S <b> 10, the connection cutoff command unit 17 determines whether or not the administrator of the power generation system 1 is set to permit the electrical load 9 to be connected to the outlet plug 6 a of the dedicated outlet 6.

  If it is determined that it is not permitted (NO in step S10), the process returns to step S10.

  On the other hand, if it is determined that it is permitted (YES in step S10), in step S12, electric load connection detection unit 10 determines whether electric load 9 is connected to dedicated outlet 6 or not. As described above, the connection of the electrical load 9 can be determined by whether or not the switch 6a of the dedicated outlet 6 is turned on.

  If it is determined that the electrical load is not connected (NO in step S12), the process returns to step S12.

  On the other hand, if it is determined that an electrical load is connected (YES in step S12), in step S14, the power amount comparison unit 13 determines whether the generated power amount P received by the generated power amount receiving unit 11 is greater than zero. Determine if.

  If it is determined that the amount of generated power P is not greater than zero (NO in step S14), in step S16, the connection cutoff command unit 17 connects the distribution board 5 and the electrical load 6 to the connection cutoff unit 14. Send a control signal to shut off. The connection blocking unit 14 blocks the connection between the distribution board 5 and the electric load 6.

  On the other hand, if it is determined that the amount of generated power P is greater than zero (YES in step S14), in step S18, connection cut-off command unit 17 causes distribution board 5 and electric load 6 to be connected to connection cut-off unit 14. Send a control signal to connect. The connection blocking unit 14 connects the distribution board 5 and the electric load 6.

  Next, in step S20, the power consumption amount measuring unit 12 starts measuring the power consumption amount Q. The power consumption storage unit 16 stores the measured power consumption Q.

  Subsequently, in step S <b> 22, the power amount comparison unit 13 compares the generated power amount P and the consumed power amount Q to determine whether the generated power amount P is larger than the consumed power amount Q.

  If it is determined that the generated power amount P is larger (YES in step S22), in step S24, the surplus power amount storage unit 15 adds surplus power amount R1 to the stored surplus power data. Remember. Then, the process returns to step S12.

  On the other hand, if it is determined that the generated power amount P is not larger (NO in step S22), in step S26, the power amount comparison unit 13 indicates the surplus power data stored in the surplus power amount storage unit 15. Determine whether the energy value is greater than zero.

  If it is determined that the power amount value indicated by the surplus power data is not greater than zero (NO in step S26), the process proceeds to step S16, and the connection between distribution board 5 and electrical load 9 is disconnected.

  On the other hand, if it is determined that the power amount value indicated by the surplus power data is greater than zero (YES in step S26), in step S28, the surplus power amount storage unit 15 adds the surplus power amount R2 to the stored surplus power data. The surplus power data obtained by subtracting is stored. Then, the process returns to step S12.

  The total power consumption of the electrical load 9 stored in the power consumption storage unit 16 is paid to the user to pay for the usage when the outlet plug 9a of the electrical load 9 is removed from the dedicated outlet 6. A display for prompting may be displayed on the display unit 18.

  Further, for example, the display unit 18 is configured by an LED (Light Emitting Diode), and when the generated power amount receiving unit 11 receives the generated power amount P, the LED is turned on, and when not received, the LED is turned off. Also good.

  As described above, according to the power generation system of the present invention, it is possible to prevent electric power from being used by connecting an electric load in the power generation system without forcing the manager of the power generation system to perform a work burden. Thereby, it is possible to prevent the electric power from being used by connecting an electric load in the power generation system without the administrator of the power generation system. In addition, when an electrical load is connected and used in an emergency, the profit from the power generation of the power generation system is prevented from decreasing by detecting the amount of power consumed by the electrical load and the user paying for the usage. be able to. Furthermore, generation of global warming gas from the power generation system can be suppressed as much as possible.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is the figure which showed the electric power generation system in this Embodiment. It is the figure which showed the front and side of the exclusive outlet. 3 is a functional block diagram of a control unit 7. FIG. 3 is a flowchart showing processing of a control unit 7. It is a figure which shows an example of a solar energy power generation system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Power generation system, 2 Solar cell module, 3 Power exchange part, 4 Commercial power system, 5 Distribution board, 6 Dedicated outlet, 6a Switch, 7 Control part, 8 Measurement part, 9 Electrical load, 9a Outlet plug, 10 Electrical load Connection detection unit, 11 Power generation amount reception unit, 12 Power consumption amount measurement unit, 13 Power amount comparison unit, 14 Connection cut-off unit, 15 Surplus power amount storage unit, 16 Power consumption amount storage unit, 17 Connection cut-off command unit, 18 Display unit, 101 power generation system, 102 solar cell module, 103 power conversion unit, 104 commercial power system, 105 distribution board, 108 weighing unit.

Claims (3)

A power generation unit that is a DC power supply;
A power conversion unit for converting a direct current from the power generation unit into an alternating current;
A connection unit for connecting the power conversion unit and the commercial power system;
A control unit for controlling the power supply from the power generation unit according to the power amount value of surplus power data for the electrical load outlet connected to the connection unit,
The controller is
A storage unit for recording the surplus power data ;
A connection blocking unit that permits or prohibits power supply to the electrical load outlet;
A connection cutoff command unit for controlling the connection cutoff unit;
A power consumption metering unit for measuring the power consumption of the electrical load connected to the electrical load outlet;
A power amount comparison unit for comparing the amount of power generated by the power generation unit and the power consumption of the electric load,
The connection disconnection command unit determines whether or not power supply to the electrical load outlet is permitted for a user who uses the electrical load,
When power supply to the electrical load outlet is permitted for the user, the power amount comparison unit determines whether the generated power amount is greater than zero,
The connection disconnection command unit is configured to prohibit supplying power to the electrical load outlet when the power amount comparison unit determines that the generated power amount is not greater than zero. Instruct the shut-off unit,
The connection cutoff command unit is configured to allow the power cutoff unit to permit power supply to the electrical load outlet in response to the power amount comparison unit determining that the generated power amount is greater than zero. Instruct the department,
The power amount comparison unit determines that the generated power amount is greater than zero and the generated power amount is greater than the consumed power amount of the electric load measured by the consumed power amount measuring unit. If the record the electrodeposition competence subtracting the power consumption amount from the generated power quantity in the storage unit by adding the amount of power value of the surplus power data,
The power amount comparison unit is configured such that the generated power amount is greater than zero, the generated power amount is not greater than the consumed power amount, and the surplus power data has a power amount value greater than zero. If it is determined that, the amount of power obtained by subtracting the amount of generated power from the amount of power consumption is subtracted from the power amount value of the surplus power data, and recorded in the storage unit,
In the connection cutoff command unit, the power amount comparison unit is configured such that the generated power amount is greater than zero, the generated power amount is not greater than the consumed power amount , and the power of the surplus power data The power generation system further instructing the connection cutoff unit to prohibit supplying power to the electrical load outlet in response to determining that the quantity value is not greater than zero . The power generation system according to claim 1, wherein the storage unit stores the power consumption amount of the electric load measured by the power consumption amount measurement unit, and calculates a price based on the stored power consumption amount. The power generation system according to claim 1 , wherein the DC power source is a solar battery.

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