JP6453585B2 - Power control device, power storage device, power control system, and power control method - Google Patents

Description

  The present invention relates to a power control device, a power storage device, a power control system, and a power control method.

  2. Description of the Related Art Conventionally, a solar power generation system that stores power generation energy generated by a solar battery in a power storage unit when the voltage of a power system exceeds a predetermined value is known (for example, Patent Document 1).

JP-A-6-133472

  By the way, as a system for selling (selling power) the generated electric power, two systems, such as surplus purchase and full quantity purchase, which are different from each other, are known. Surplus purchase is a system that presupposes that the power generated by the power generation equipment is sold to a general electric utility, etc., that is not used at home. On the other hand, the total purchase is a system that presupposes that all generated power is sold to general electric utilities. Thus, although there are currently a plurality of systems with different power selling conditions, the method described in Patent Document 1 only assumes the case of surplus purchase.

  An object of the present invention made in view of such circumstances is a power control device, a power storage device, a power control system, and a power control device capable of effectively using the power generated by the power generation facility as much as possible according to the conditions of surplus purchase or full amount purchase. It is to provide a power control method.

  In order to solve the above problems, a power control device according to the present invention is a power control device that grid-connects power generation equipment under any of the conditions of full purchase or surplus purchase, and is a first link for connecting to the grid. When detecting that the first abnormality has occurred in the system relay, the self-sustained output relay for connecting to the power storage device, and the system to which the own device is connected, the first connected relay is opened, and the system of the own device is opened. A first control unit that performs control to close the independent output relay when the interconnection condition is surplus purchase, and to open the independent output relay when the grid interconnection condition of the own apparatus is full purchase.

  In the power control apparatus according to the present invention, it is preferable that the first abnormality is a voltage increase in a system exceeding a threshold value.

  Moreover, in the power control apparatus according to the present invention, when the first control unit detects that the second abnormality has occurred in the system to which the own apparatus is connected, after opening the first connection relay It is preferable to close the self-supporting output relay.

  In the power control apparatus according to the present invention, it is preferable that the second abnormality is a system power failure.

  In the power control device according to the present invention, it is preferable that the power generated by the power generation facility can be supplied as charging power to the power storage device by closing the self-sustained output relay.

  In the power control device according to the present invention, it is preferable that when the self-sustained output relay is closed, a connection request is output to the power storage device.

  Moreover, in order to solve the said subject, the electrical storage apparatus which concerns on this invention is an electrical storage apparatus used in connection with the electric power control apparatus which carries out grid connection, and the 2nd interconnection for connecting with a system | strain When a connection request is obtained from the power control device due to the occurrence of a first abnormality and a self-sustained input relay for connecting to the relay, the power control device, when the grid connection condition of the power control device is surplus purchase Includes a second control unit that closes the self-supporting input relay and performs control to open the self-supporting input relay when the grid connection condition of the power control device is full purchase.

  In the power storage device according to the present invention, it is preferable that the first abnormality is a voltage increase of a system exceeding a threshold value.

  Further, in the power storage device according to the present invention, when the second control unit detects that a second abnormality has occurred in the system connected to the power control device, the second control unit opens the second interconnection relay. It is preferable to close the self-supporting input relay.

  In the power storage device according to the present invention, it is preferable that the second abnormality is a system power failure.

  In the power storage device according to the present invention, it is preferable that the generated power of the power generation facility can be supplied as charging power by closing the self-supporting input relay.

  In the power storage device according to the present invention, it is preferable that when the self-supporting input relay is closed, a connection request is acquired from the power control device.

  In order to solve the above-mentioned problem, the power control system according to the present invention is used by connecting a power control device that interconnects power generation facilities under the conditions of either full purchase or surplus purchase, and the power control device. The power control system includes: a first interconnection relay for connecting to a grid; a self-sustained output relay for connecting to the power storage device; and When it is detected that the first abnormality has occurred in the grid to be connected, the first interconnection relay is opened, and when the grid interconnection condition of the own device is excessive purchase, the independent output relay is closed, A first control unit that performs control to open the self-sustained output relay when the grid connection condition is full purchase, and the power storage device includes a second grid relay for connection to the grid, and the power Independent entry to connect with control equipment When the own device detects that a first abnormality has occurred in a system in which the relay and the own device are connected, or acquires a connection request based on the occurrence of the first abnormality from the power control device, the power control A second control unit that performs control to close the independent input relay when the grid connection condition of the device is surplus purchase, and to open the independent input relay when the grid connection condition of the power control device is purchase of the full amount With.

  Furthermore, in order to solve the above-described problem, the power control method according to the present invention is used by connecting a power control apparatus that interconnects power generation facilities under the conditions of either full purchase or surplus purchase, and the power control apparatus. A power control method in a power control system comprising a power storage device, wherein a first abnormality occurs when the power control device is disconnected from the system when a first abnormality occurs in the system connected to the power control device; After the first step, when the grid connection condition of the power control device is surplus purchase, the power control device controls the power supply equipment so that power from the power generation equipment can be supplied to the power storage device. And, after the first step, when the grid connection condition is full purchase, the third step of controlling the power control device so that the power from the power generation facility cannot be supplied to the power storage device; Characterized in that it has.

  According to the power control device, the power storage device, the power control system, and the power control method according to the present invention, it is possible to effectively use the power generated by the power generation facility as much as possible according to the conditions of surplus purchase or total purchase.

It is a functional block diagram in the case of surplus purchase of the electric power control system which concerns on one Embodiment of this invention. It is a functional block diagram in the case of the whole quantity purchase of the electric power control system which concerns on one Embodiment of this invention. It is a figure which shows the mode of the electric power control system when the 1st abnormality generate | occur | produces in FIG. It is a figure which shows the mode of the electric power control system when the 1st abnormality generate | occur | produces in FIG. It is a figure which shows the mode of the electric power control system when the 2nd abnormality generate | occur | produces in FIG. It is a figure which shows the mode of the electric power control system when the 2nd abnormality generate | occur | produces in FIG. It is a figure which shows the operation | movement flow of a power control system when a 1st abnormality generate | occur | produces. (A) is a figure which shows the operation | movement flow of the electric power control apparatus when the 2nd abnormality generate | occur | produces, (b) is a figure which shows the operation | movement flow of the electrical storage apparatus when the 2nd abnormality generate | occur | produces. .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Although the functions of the power generation facility 1, the power control device 2, and the power storage device 3 according to an embodiment of the present invention will be described, it should be noted that they are not intended to exclude other functions included in them.

[System configuration]
FIG. 1 is a functional block diagram in the case of surplus purchase of a power control system according to an embodiment of the present invention. The power control system includes a power generation facility 1, a power control device 2, a power storage device 3, a load 4 and a load 5. In the power control system of FIG. 1, the power control device 2 and the power storage device 3 are connected to the same system (commercial power supply system) in order to perform surplus power sales of the power generated by the power generation facility 1. In FIG. 1, the control line and the information transmission line are indicated by broken lines, and the power line is indicated by a solid line.

  The power generation facility 1 is, for example, a PV (photovoltaic) panel, and converts the energy of sunlight into a direct current. In the power generation facility 1, for example, power generation units having photoelectric conversion cells are connected in a matrix and output a predetermined direct current (for example, 10 A). The power generation facility 1 is capable of photoelectric conversion, such as a silicon-based polycrystalline solar cell, a silicon-based single crystal solar cell, or a thin-film solar cell such as CIGS (Copper Indium Gallium DiSelenide), and the type thereof is not limited. Further, the power generation facility 1 is not limited to a facility using solar power generation, and may be a facility using a fuel cell, wind power generation, thermal power generation, or the like.

  The power control device 2 includes a DC / DC converter 21, an inverter 22, a first control unit 23, a storage unit 24, a first interconnection relay 25, an independent output relay 26, and a sensor 27.

  The DC / DC converter 21 steps up and down the voltage of the DC power generated by the power generation facility 1. As shown in FIG. 1, the DC / DC converter 21 is connected to the output end of the power generation facility 1.

  The inverter 22 is connected to the output terminal of the DC / DC converter 21, converts the DC power output from the DC / DC converter 21 into AC power, and outputs the AC power.

  The first control unit 23 is a processor such as a CPU (Central Processing Unit) that controls various operations of the power control apparatus 2. The first control unit 23 acquires information such as the system voltage from the sensor 27 and can detect whether an abnormality such as a voltage increase or a power failure has occurred in the system to which the power control apparatus 2 is connected. it can. For example, the sensor 27 is connected to the output terminal of the first interconnection relay 25. Further, the first control unit 23 controls the opening and closing of the first interconnection relay 25 and the independent output relay 26 according to the abnormality that has occurred and the grid interconnection condition of the power control device 2. Details will be described later. Furthermore, the first control unit 23 can output a connection request to the power storage device 3 when communicating with the power storage device 3 by wire or wirelessly and closing the self-supporting output relay 26.

  The storage unit 24 stores whether the grid connection condition is full purchase or surplus purchase. For example, the grid connection condition is set by the user when the power control apparatus 2 is installed. FIG. 2 shows a functional block diagram of the power control system in the case of purchasing all the quantities.

  FIG. 2 shows a power control system in the case of purchasing all the quantities. In this case, the power control device 2 and the power storage device 3 are connected to different systems. In this case, when the power control device 2 and / or the power storage device 3 are grid-connected, connecting the power control device 2 and the power storage device 3 is a violation of the regulations.

  When the power control device 2 and the power storage device 3 are connected to the same system (that is, in the case of surplus purchase), the regulation is not violated even if the power control device 2 and the power storage device 3 are connected.

  Returning to the description of FIG. The first interconnection relay 25 is a switch connected between the inverter 22 and the system for switching connection (interconnection) and disconnection (disconnection) between the system and the power control device 2. When the first interconnection relay 25 is closed, the system and the power control device 2 are connected, and when the first interconnection relay 25 is open, the system and the power control device 2 are disconnected.

  The independent output relay 26 is a switch connected between the inverter 22 and the power storage device 3 for switching connection and disconnection between the power control device 2 and the power storage device 3. When the self-supporting output relay 26 is closed, the power control device 2 and the power storage device 3 can be connected, and when the self-supporting output relay 26 is open, the power control device 2 and the power storage device 3 are disconnected. Although details will be described later, by closing the self-sustained output relay 26, the generated power of the power generation facility 1 can be supplied to the power storage device 3 as charging power.

  The power storage device 3 includes a second control unit 31, an independent input relay 32, a PCS (Power Conditioning System) 33, a second interconnection relay 34, a storage battery 35, and a sensor 36. The power storage device 3 is a device that stores (charges) electricity generated by the power generation facility 1. The power storage device 3 can store the electricity generated by the power generation facility 1 even in the event of an abnormality such as a power failure in the system and a voltage increase in the system.

  The second control unit 31 is a processor such as a CPU that controls various operations of the power storage device 3. The second control unit 31 can detect whether or not a power failure has occurred in the system connected to the power storage device 3 using the information notified from the sensor 36. Further, the second control unit 31 controls the opening / closing of the second interconnection relay 34 and the independent input relay 32 in accordance with the occurring abnormality and the grid interconnection condition of the power control device 2. Details will be described later. Further, the second control unit 31 can acquire a connection request from the power control device 2 when communicating with the power control device 2 by wire or wirelessly and closing the self-supporting input relay 32.

  The independent input relay 32 is a switch that is connected between the power control device 2 and the PCS 33 and switches connection and disconnection between the power control device 2 and the power storage device 3. When the self-supporting input relay 32 is closed, the power control device 2 and the power storage device 3 can be connected. When the self-supporting input relay 32 is open, the power control device 2 and the power storage device 3 are disconnected.

  The PCS 33 is a PCS having an inverter, an AC / DC converter, a bidirectional DC / DC converter, and the like. The PCS 33 charges the storage battery 35 by outputting the power converted to direct current to the storage battery 35. The PCS 33 converts the DC power acquired from the storage battery 35 into AC power and outputs the AC power to the load 4.

  The second interconnection relay 34 is a switch connected between the system and the PCS 33 for switching connection (interconnection) and disconnection (disconnection) between the system and the power storage device 3. When the second interconnection relay 34 is closed, the system and the power storage device 3 are connected, and when the second interconnection relay 34 is open, the system and the power storage device 3 are disconnected.

  The load 4 and the load 5 are power loads that consume power, and are various electric products such as an air conditioner, a microwave oven, a refrigerator, a television, a HEMS (Home Energy Management System), and a router used in the home. Moreover, the load 4 and the load 5 are machines, lighting equipment, etc., such as an air conditioner or a lighting fixture used in commercial and industrial facilities. The number of loads 4 and loads 5 is not limited. With the distribution board, it is possible to branch power to a plurality of branches and supply it to a plurality of loads.

  Hereinafter, power control processing performed by the power control system according to the embodiment of the present invention will be described. In the following description, as an example, the first abnormality will be described as a system voltage increase exceeding a threshold (for example, 107 V), and the second abnormality will be described as a system power failure. Further, even when the grid connection condition is purchase of the entire amount, that is, when the power control device 2 and the power storage device 3 are connected to different systems, the same abnormality occurs in each system.

[Power control processing when first abnormality occurs]
Based on the information notified from the sensor 27, the first control unit 23 confirms that a system voltage increase (first abnormality) has occurred in the system to which the own device (power control device 2) is connected (connected). When detected, the first interconnection relay 25 is opened. In addition, the first control unit 23 refers to the storage unit 24 and acquires the grid connection condition of the own device (the power control device 2).

  When the grid connection condition is surplus purchase (shown in FIG. 3), the first control unit 23 closes the self-sustained output relay 26. On the other hand, when the grid connection condition is full purchase (shown in FIG. 4), the first control unit 23 opens the self-sustained output relay 26.

  Further, when the first control unit 23 detects that a system voltage increase (first abnormality) has occurred, the first control unit 23 outputs a connection request to the power storage device 3 and then uses the power generated by the power generation facility 1 to store the power generated by the power storage device 3. You may make it supply to. In this case, the first control unit 23 may flow the power generated by the power generation facility 1 only when permission for the connection request is acquired from the power storage device 3.

  When the second control unit 31 acquires a connection request from the power control device 2 due to the occurrence of a system voltage increase, the second control unit 31 detects that a system voltage increase has occurred based on the connection request. The second control unit 31 confirms the grid connection condition of the power control device 2 through communication with the power control device 2.

  When the grid connection condition of the power control device 2 is surplus purchase (shown in FIG. 3), the second control unit 31 closes the self-supporting input relay 32 and outputs a permission for the connection request to the first control unit 23. To do. At this time, the second interconnection relay 34 is closed. And if the 1st control part 23 acquires permission with respect to a connection request from the electrical storage apparatus 3, the electric power generated with the power generation equipment 1 will be supplied to the electrical storage apparatus 3, and the storage battery 35 will be charged.

  On the other hand, when the grid connection condition is full purchase (shown in FIG. 4), the second control unit 31 opens the self-supporting input relay 32. In this case, the second control unit 31 does not output permission for the connection request to the first control unit 23, or outputs “impossibility”. At this time, the second interconnection relay 34 is closed.

  By the way, as a method for the second control unit 31 to detect the occurrence of the system voltage rise (first abnormality), a connection request is output and detected by communication from the first control unit 23 to the second control unit 31. Explained how to do. However, in addition to this, the second control unit 31 may directly detect the occurrence of the system voltage increase (first abnormality) by the sensor 36 of the power storage device 3 itself.

[Power control process when second abnormality occurs]
For example, the first control unit 23 generates a power failure (second abnormality) in the system to which the own device (power control device 2) is connected (connected) based on information such as the voltage notified from the sensor 27. When it is detected, the first interconnection relay 25 is opened regardless of the grid interconnection condition of the power control device 2. Thereafter, the first control unit 23 closes the self-supporting output relay 26. FIG. 5 shows the case where the grid connection condition is surplus purchase, and FIG. 6 shows the case where the grid connection condition is all purchase.

  On the other hand, when the second control unit 31 detects that a power failure (second abnormality) has occurred based on the information notified from the sensor 36, the second control unit 31 does not depend on the grid connection condition of the power control device 2. The system relay 34 is opened and the self-supporting input relay 32 is closed. At this time, the electric power generated by the power generation facility 1 flows to the power storage device 3 and the storage battery 35 is charged.

[Operation flow]
FIG. 7 is a diagram illustrating an operation flow when a system voltage increase (first abnormality) occurs in the power control system according to the embodiment of the present invention.

  The power control device 2 detects that a system voltage increase (first abnormality) has occurred based on the information notified from the sensor 27 (step S1). After the detection, the power control device 2 opens the first interconnection relay 25 (step S2). The power control apparatus 2 refers to the storage unit 24 to acquire the grid interconnection condition (step S3), and determines whether the grid interconnection condition is surplus purchase or full quantity purchase (step S4).

  When the grid connection condition is surplus purchase, the power control device 2 closes the self-sustained output relay 26 (step S5). On the other hand, when the grid connection condition is full purchase, the power control device 2 opens the self-sustained output relay 26 (step S6). The power control device 2 outputs a connection request to the power storage device 3 at an arbitrary time after detecting that the first abnormality has occurred (step S7).

  For example, when the power storage device 3 detects that a system voltage increase (first abnormality) has occurred based on the connection request (step S8), the power storage device 3 inquires of the power control device 2 about the system interconnection condition of the power control device 2 ( Step S9). When the power storage device 3 acquires the grid connection condition from the power control apparatus 2 (step S10), the power storage device 3 determines whether the grid connection condition is excessive purchase or full purchase (step S11). When the grid connection condition is surplus purchase, the power storage device 3 closes the self-supporting input relay 32 (step S12), and when the grid connection condition is full purchase, the power storage device 3 opens the self-supporting input relay 32 (step S13).

  As described above, the power storage device 3 (second control unit 31) not only detects the occurrence of the first abnormality based on the connection request acquired from the power control device 2, but also includes a sensor 36 included in the power storage device 3 itself. May be detected directly by.

  Fig.8 (a) is a figure which shows the operation | movement flow when the power failure (2nd abnormality) generate | occur | produces of the power control apparatus 2 which concerns on one Embodiment of this invention. Since the power control device 2 and the power storage device 3 do not necessarily communicate, the operation flow of the power control device 2 and the operation flow of the power storage device 3 will be described separately.

  The power control device 2 detects that a power failure (second abnormality) has occurred based on the information notified from the sensor 27 (step S21). Next, the power control device 2 opens the first interconnection relay 25 (step S22), and then closes the self-supporting input relay 32 (step S23).

  FIG. 8B is a diagram illustrating an operation flow when a power failure (second abnormality) occurs by the power storage device 3 according to an embodiment of the present invention. The power storage device 3 detects that a power failure (second abnormality) has occurred based on the information notified from the sensor 36 (step S31). Next, the power storage device 3 opens the second interconnection relay 34 (step S32) and closes the self-supporting input relay 32 (step S33).

  According to the present embodiment, it is possible to make effective use of the power generated by the power generation equipment as much as possible according to the conditions of surplus purchase or full purchase.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various variations and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, functions included in each member, each part, each step, and the like can be rearranged so as not to be logically contradictory. Even when the present invention is implemented as a method invention, it is possible to combine or divide a plurality of parts and steps into one.

  In addition, when the first control unit 23 and the second control unit 31 according to the present invention are configured by a computer, a program describing processing contents for realizing each function is stored in an internal or external storage unit of the computer. It can be realized by reading and executing this program by the central processing unit (CPU) of the computer. In addition, such a program can be distributed by selling, transferring, or lending a portable recording medium such as a DVD or a CD-ROM, and such a program is stored in a storage unit of a server on a network, for example. And the program can be distributed by transferring the program from the server to another computer via the network. In addition, a computer that executes such a program can temporarily store, for example, a program recorded on a portable recording medium or a program transferred from a server in its own storage unit. As another embodiment of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and each time the program is transferred from the server to the computer. In addition, the processing according to the received program may be executed sequentially.

DESCRIPTION OF SYMBOLS 1 Power generation equipment 2 Power control apparatus 21 DC / DC converter 22 Inverter 23 1st control part 24 Memory | storage part 25 1st interconnection relay 26 Self-supporting output relay 27 Sensor 3 Power storage device 31 2nd control part 32 Self-supporting input relay 33 PCS
34 Second interconnection relay 35 Storage battery 36 Sensor 4, 5 Load

Claims (14)

A power control device that interconnects power generation facilities under the conditions of either full purchase or surplus purchase,
A first interconnection relay for connecting to the grid;
A self-supporting output relay for connecting to the power storage device;
When it is detected that the first abnormality has occurred in the system connected to its own device, the first connection relay is opened, and when the system connection condition of the own device is excessive purchase, the independent output relay is closed. A power control device comprising: a first control unit that performs control to open the self-sustained output relay when the system interconnection condition of the own device is purchase of the entire amount. The power control apparatus according to claim 1,
The power control apparatus according to claim 1, wherein the first abnormality is a system voltage increase exceeding a threshold value. The power control apparatus according to claim 1 or 2,
When the first control unit detects that a second abnormality has occurred in a system connected to its own device, the first control unit closes the independent output relay after opening the first connection relay. Power control device. The power control apparatus according to claim 3,
The power control apparatus according to claim 2, wherein the second abnormality is a system power failure. In the power control device according to any one of claims 1 to 4,
By closing the self-supporting output relay, it is possible to supply the generated power of the power generation facility as charging power to the power storage device. The power control apparatus according to claim 5, wherein
A power control apparatus that outputs a connection request to the power storage device when the self-sustained output relay is closed. A power storage device that is used in connection with a power control device that interconnects power generation facilities,
A second interconnection relay for connecting to the grid;
A self-supporting input relay for connecting to the power control device;
When it is detected that a first abnormality has occurred in the system to which the own apparatus is connected, or a connection request based on the occurrence of the first abnormality is acquired from the power control apparatus, the grid connection condition of the power control apparatus A power storage device comprising: a second control unit that performs control to close the independent input relay when the surplus purchase is made and open the independent input relay when the grid connection condition of the power control device is purchase of the full amount. The power storage device according to claim 7,
The power storage device according to claim 1, wherein the first abnormality is a system voltage increase exceeding a threshold value. The power storage device according to claim 7 or 8,
When the second control unit detects that a second abnormality has occurred in the system to which the power control device is connected, the second control unit opens the second interconnection relay and then closes the self-supporting input relay. Power storage device. The power storage device according to claim 9, wherein
The power storage device according to claim 2, wherein the second abnormality is a system power failure. The power storage device according to any one of claims 7 to 10,
A power storage device characterized in that the power generated by the power generation facility can be supplied as charging power by closing the self-standing input relay. The power storage device according to claim 11,
When closing the self-supporting input relay, the power storage device acquires a connection request from the power control device. A power control system comprising a power control device that interconnects power generation facilities under any of the conditions of total purchase and surplus purchase, and a power storage device that is used in connection with the power control device,
The power control device
A first interconnection relay for connecting to the grid;
A self-supporting output relay for connecting to the power storage device;
When it is detected that the first abnormality has occurred in the system connected to its own device, the first connection relay is opened, and when the system connection condition of the own device is excessive purchase, the independent output relay is closed. A first control unit that performs control to open the self-sustained output relay when the grid connection condition of the own device is full purchase,
The power storage device
A second interconnection relay for connecting to the grid;
A self-supporting input relay for connecting to the power control device;
When the own device detects that a first abnormality has occurred in a system connected to the own device or acquires a connection request based on the occurrence of the first abnormality from the power control device, the system of the power control device A second control unit configured to close the independent input relay when the interconnection condition is surplus purchase, and to open the independent input relay when the grid interconnection condition of the power control device is full purchase. Power control system. A power control method in a power control system comprising a power control device that interconnects power generation facilities under any condition of total purchase and surplus purchase, and a power storage device that is used in connection with the power control device,
A first step of disconnecting the power control device from the system when a first abnormality occurs in the system connected to the power control device;
After the first step, when the grid connection condition of the power control device is surplus purchase, the power control device controls the power supply equipment so that power from the power generation equipment can be supplied to the power storage device. When,
After the first step, when the grid connection condition is full purchase, the third step of controlling the power control device so that power from the power generation equipment cannot be supplied to the power storage device;
A power control method comprising:

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