JP2010259170A - Power supply device for autonomous operation, and grid connected system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device for autonomous operation and a grid connected system with which it is possible to facilitate the operation of changing an operation mode and the operation of connecting a load to an outlet for autonomous operation and easy understanding of the correspondence between switches for operation mode change and outlets for autonomous operation. <P>SOLUTION: A power conditioner 2 includes an inverter circuit 21, that converts the output of a photovoltaic panel 1 into an alternating current. In autonomous operation, systems are separated by a parallel-off switch 22 and a power supply device A for autonomous operation is supplied with the output thereof through a circuit breaker 24 for autonomous operation. The power supply device A for autonomous operation includes a change-over switch 3 that generates a contact signal for changing the operation mode of the power conditioner 2 to either a system linkage operation mode or to an autonomous operation mode, according to a changing operation; and an outlet 4 for supplying power supplied from the power conditioner 2 to a load in autonomous operation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power supply device for autonomous operation and a grid interconnection system using the same.

  In recent years, renewable energy has been introduced as an alternative to fossil fuels as a countermeasure against global warming. Even in ordinary households, the output of solar panels installed on the roof is converted to AC, and commercial AC power and systems Photovoltaic power generation systems that perform interconnection operation are becoming widespread (for example, see Patent Document 1).

  Fig.4 (a) is a system block diagram of the conventional grid connection system provided with the solar cell panel as a distributed power supply. This system includes a solar panel 1 installed on a roof of a house, a power conditioner 2 that converts DC power generated by the solar panel 1 into AC power, and a residential distribution board 5. The power conditioner 2 is installed in a house, for example, at an upper position of a wall.

  The residential distribution board 5 accommodates a main breaker 51 connected to a commercial AC power source AC and a plurality of branch breakers 52 connected to a main line 53 on the secondary side of the main breaker 51.

  As shown in FIG. 4B, the power conditioner 2 includes an inverter circuit 21 that converts the output of the solar cell panel 1 into AC power, and a disconnection provided between the output of the inverter circuit 21 and the main line 53. A switch 22, a stand-alone operation outlet 23 that is arranged on the side of the body 2 a and supplies AC power supplied from the inverter circuit 21 to the electric device 8 during the independent operation, an output of the inverter circuit 21, and a stand-alone operation outlet According to the setting of the changeover switch (SW) 25 for switching the operation mode of the power conditioner 2 to either the grid interconnection operation or the independent operation, and the changeover switch 25 An operation mode switching circuit 26 for switching the operation mode by switching on / off of the disconnect switch 22 and the breaker 24 for independent operation; It consists LED or a liquid crystal display provided on the front of a, and a state display unit 27 for displaying the power status and the operation mode by the solar cell panel 1 (grid-connected operation mode or autonomous operation mode) or the like.

  Here, when the operation mode is switched to the grid interconnection operation mode using the changeover switch 25, the operation mode switching circuit 26 turns on the disconnection switch 22 and turns off the self-sustained operation breaker 24, and thereby the inverter circuit 21. Are connected to the main line 53, and the distributed power source is system-connected to the commercial AC power source.

  On the other hand, when operating the power conditioner 2 in the autonomous operation mode at the time of a power failure of the commercial AC power supply AC, when the user performs an operation of switching the operation mode to the autonomous operation mode using the changeover switch 25, the operation mode switching circuit 26 is operated. In response to a switching signal from the changeover switch 25, the disconnection switch 22 is turned off to separate the distributed power source from the commercial power system, and the self-sustained operation breaker 24 is turned on to output the output of the inverter circuit 21. Supply to the outlet 23 for independent operation. At this time, the status display unit 27 displays that the operation mode of the inverter 2 has been switched to the independent operation mode, and the user who has confirmed this display connects the desired electrical device 8 to the independent operation outlet 23. Then, the output of the inverter circuit 21 is supplied to the electric equipment 8 connected to the outlet 23 for independent operation. In addition, the dotted line a in FIG. 4A shows the flow of the generated power during the grid connection operation, and the alternate long and short dash line b shows the flow of the generated power during the independent operation.

  Incidentally, in the grid interconnection system of FIG. 4, the power conditioner 2 is installed in the house, but there is also a grid interconnection system in which the power conditioner 2 is installed outside the house, and the system configuration diagram is shown in FIG. ). In this grid-connected system, since the power conditioner 2 is installed outside the home, a liquid crystal display is provided for the power outlet 8 for supplying power to the electric device 8 in the self-sustaining operation mode, the power generation status of the solar panel 1, and the like. A power generation monitor 7 having a display unit 7a for displaying by a display LCD or a light emitting diode LD is provided separately from the power conditioner 2 and installed in the house. Data communication is performed between the power generation monitor 7 and the power conditioner 2 by, for example, serial communication such as RS485, and information such as the power generation status transmitted from the power conditioner 2 is displayed on the power generation monitor 7. Further, the power generation monitor 7 is provided with a changeover switch (SW) 7b for switching the operation mode of the power conditioner 2 to either the grid interconnection operation or the independent operation.

  On the other hand, as shown in FIG. 5B, the power conditioner 2 is provided between the inverter circuit 21 that converts the output of the solar cell panel 1 into AC power, and the output of the inverter circuit 21 and the main line 53. The disconnection switch 22, the independent operation breaker 24 provided between the output of the inverter circuit 21 and the independent operation outlet 6, and the disconnection opening / closing according to the setting of the changeover switch 7 b provided in the power generation monitor 7. The operation mode switching circuit 26 that switches the operation mode by switching the on / off of the unit 22 and the breaker 24 for independent operation, and information such as the power generation status and operation status of the solar panel 1 are output to the power generation monitor 7 An operation information output circuit 28 to be displayed on the power generation monitor 7 is provided.

  Here, when the operation mode is switched to the grid connection operation mode using the changeover switch 7b provided in the power generation monitor 7, the operation mode changeover circuit 26 is disconnected according to the changeover signal input from the changeover switch 7b. The switch 22 is turned on, the self-sustained operation breaker 24 is turned off, and the output of the inverter circuit 21 is connected to the main line 53, so that the distributed power supply is grid-connected to the commercial AC power supply.

  On the other hand, when operating the power conditioner 2 in the autonomous operation mode at the time of a power failure of the commercial AC power supply AC, when the user performs an operation of switching the operation mode to the autonomous operation mode using the changeover switch 7b, the operation mode switching circuit 26 is operated. However, in response to the switching signal from the switch 7b, the disconnection switch 22 is turned off to separate the distributed power source from the commercial power system, and the self-sustained operation breaker 24 is turned on to output the inverter circuit 21. Is supplied to the outlet 6 for independent operation. At this time, the display unit 7 a of the power generation monitor 7 displays that the operation mode of the power conditioner 2 has been switched to the self-sustaining operation mode based on the operation mode information input from the operation information output circuit 28. When the user who has confirmed this display connects the desired electrical device 8 to the independent operation outlet 6, the output of the inverter circuit 21 is supplied to the electrical device 8 connected to the independent operation outlet 6.

JP 2001-124814 A

  Since the power conditioner 2 used in the former grid interconnection system described above is often installed at a high place near the ceiling, the power conditioner 2 has an independent operation outlet 23 and a changeover switch 25. In the case where it is provided, there has been a problem that it is difficult to perform an operation of switching the operation mode to either the grid interconnection operation mode or the independent operation mode and the operation of connecting the plug of the electric device 8 to the outlet 23 for the independent operation. In addition, since the stand-alone operation outlet 23 is located at a high place, there is a problem in that it is difficult to place the electrical device 8 connected to the stand-alone operation outlet 23.

  Moreover, in the latter grid connection system mentioned above, since the power conditioner 2 is installed outside the house, the independent operation outlet 6 and the changeover switch 7b provided separately from the power conditioner 2 are installed in the house. The self-sustained operation outlet 6 is installed at a height position close to the floor on the wall surface in the same manner as a general outlet, whereas the power generation monitor 7 having the change-over switch 7b has a human eye in consideration of visibility. It is installed at a height slightly lower than the position. Therefore, the stand-alone operation outlet 6 and the changeover switch 7b of the power generation monitor 7 are installed at a remote location, and in order to supply power from the stand-alone operation outlet 6, the system interconnection operation mode is changed to the independent operation mode. There is a problem that it is difficult to know where the changeover switch 7b is located.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to easily perform an operation for switching the operation mode and an operation for connecting a load to a stand-alone operation outlet, and switch the operation mode. It is an object of the present invention to provide a power supply device for self-sustained operation in which the correspondence between a switch and an outlet for self-sustained operation can be easily understood, and a grid interconnection system using the same.

  In order to achieve the above object, the invention of claim 1 is inserted between a power converter that converts DC power supplied from a distributed power source into AC, and a main line connected to a commercial AC power source and the power converter. Disconnection switch, a breaker for self-sustained operation inserted between a load and a power conversion unit that is fed during self-sustaining operation, and a disconnection switch and self-sustaining operation according to a mode switching signal input from the outside A power supply device for autonomous operation that is used in a grid interconnection system that includes an operation mode switching circuit that switches between grid interconnection operation and autonomous operation by opening and closing each circuit breaker. Operation mode switching operation unit that generates a mode switching signal for selectively switching the mode to either the grid interconnection mode or the independent operation mode, and the power supplied from the power conversion unit via the independent operation breaker Characterized by comprising a self-contained run outlet section for supplying power to the load.

  The invention of claim 2 is characterized in that, in the invention of claim 1, an energization display means for displaying whether or not energization is in progress is provided in the outlet portion for independent operation.

  Invention of Claim 3 is a grid connection system, Comprising: The power conditioner which has the said power conversion part, the said disconnection switch, the said breaker for independent operation, and the said operation mode switching circuit, Claim 1 or 2 The power supply device for self-sustaining operation according to any one of the items is provided.

  According to the first aspect of the present invention, since the power supply device for independent operation includes both the operation mode switching operation unit and the independent operation outlet unit, the operation is performed in either the grid interconnection operation mode or the autonomous operation mode. There is an effect that it is possible to provide a power supply device for self-sustained operation that makes it easy to understand the correspondence between the operation mode switching operation unit that operates to switch modes and the self-sustained operation outlet unit that is energized during self-sustained operation. Moreover, since the power supply device for independent operation is provided separately from the power conversion unit and the disconnection switch, even when the power conditioner including the power conversion unit and the disconnection switch is installed above the wall, The power supply device for self-sustained operation can be installed at a height that can be reached by humans, and the operation mode switching operation unit can be used to switch the operation mode, or the load electrical device can be connected to the self-sustained operation outlet unit. There is an effect that can be easily performed.

  According to the second aspect of the present invention, there is an effect that it can be easily determined from the display of the energization display means whether or not the self-sustained operation outlet is energized.

  According to the invention of claim 3, since the power supply device for self-sustained operation includes both the operation mode switching operation unit and the self-sustained operation outlet unit, the operation is performed in either the grid interconnection operation mode or the self-sustained operation mode. It is possible to realize a grid interconnection system in which the correspondence relationship between the operation mode switching operation unit operated for switching the mode and the independent operation outlet unit that is energized during the independent operation can be easily understood. Moreover, since the power supply device for autonomous operation is provided separately from the power conditioner including the power conversion unit and the disconnect switch, even when the power conditioner is installed above the wall, The power feeding device can be installed at a height that can be reached by humans, and it is easy to switch the operation mode using the operation mode switching operation unit and connect the load electrical equipment to the outlet port for independent operation. There is an effect that a system interconnection system that can be performed can be realized.

It is a block diagram of the grid connection system where the electric power feeder for independent operation of this embodiment is used. It is a system block diagram of the grid connection system in which the same is used. (A) is a front view of the state which attached the same to the attachment frame, (b) is a perspective view of an attachment frame. The conventional grid connection system is shown, (a) is a system configuration | structure figure, (b) is a block diagram of a power conditioner. The other conventional grid connection system is shown, (a) is a system configuration | structure figure, (b) is a block diagram of a power conditioner.

  Hereinafter, an embodiment in which the technical idea of the present invention is applied to a grid interconnection system using a solar battery panel as a distributed power source will be described with reference to the drawings.

  FIG. 2 is a schematic system configuration diagram of the grid interconnection system. This system includes, for example, a solar battery panel 1 installed on a roof RF of a house, a power conditioner 2, a power supply device A for autonomous operation, And a residential distribution board 5.

  As shown in FIG. 1, the residential distribution board 5 includes a main breaker 51 connected to a commercial AC power supply AC, and a plurality of branch breakers 52 connected to a main line 53 on the secondary side of the main breaker 51. ing.

  As shown in FIG. 1, the power conditioner 2 includes a control unit 20 (operation mode switching circuit) that performs overall control such as operation mode switching, and an inverter that converts the output of the solar cell panel 1 into AC power. The circuit 21 (power conversion unit), the disconnect switch 22 provided between the output of the inverter circuit 21 and the main line 53, and the output of the inverter circuit 21 and the power supply device A for independent operation are provided. A breaker 24 for self-sustaining operation.

  The control unit 20 switches between the grid interconnection operation and the independent operation by opening and closing the disconnection switch 22 and the independent operation breaker 24 according to the mode switching signal input from the autonomous operation power supply device A. Is what you do. Here, when a mode switching signal for switching to grid-connected operation is input, the control unit 20 turns on the disconnect switch 22 and turns off the self-sustained operation breaker 24 to commercialize the solar battery panel 1 that is a distributed power source. Connect to AC power source. In addition, when a mode switching signal for switching to independent operation is input to the control unit 20 at the time of a power failure of the commercial AC power supply AC, the control unit 20 turns off the disconnect switch 22 to separate the distributed power source from the commercial power system. At the same time, the self-sustaining operation breaker 24 is turned on to supply power to the self-sustaining operation power supply device A.

  As shown in FIGS. 1 to 3, the power supply device A for autonomous operation includes a changeover switch 3 as an operation mode switching operation unit and an outlet 4 as an autonomous operation outlet unit.

  The change-over switch 3 includes an operation handle 31 that is swingably disposed on the front surface of the instrument body, and a contact portion 32 that is turned on / off in response to the swing operation of the operation handle 31. Input to the controller 20.

  The outlet 4 is provided with a single plug connecting portion 41 on the front surface of the body 40 to which the plug 8a included in the electric device 8 is plugged and connected. The plug connecting portion 41 has a pair of plug blade insertion openings 42 that are opened on the front surface of the container body 40 and into which the blades of the plug 8a are respectively inserted, and the plug blades that are inserted into the container body 40 through the plug blade insertion openings 42. It is comprised with a pair of blade receiving member 43 which receives. A series circuit of a resistor R and a neon lamp L connected between the pair of blade receiving members 43 is housed inside the container body 40, and the light emitting portion of the neon lamp L is the front surface of the container body 40. It is open to the public.

  The changeover switch 3 and the outlet 4 are embedded in the construction material using a common mounting frame 60. The mounting frame 60 is used to embed and dispose an embedded wiring device in the construction material, and is formed in a rectangular frame shape as shown in FIG. 3B, and left and right side pieces 61 along the longitudinal direction. Are provided with three sets of fixture mounting holes 62 for mounting wiring fixtures. Further, the attachment piece 63 facing in the longitudinal direction of the attachment frame 60 has a long hole 64 for a box screw for attachment to an embedding box (not shown), and a conventionally known scissor fitting for attachment to a gypsum board constituting a wall. An attachment hole 65 for attaching (not shown) and a screw hole 66 for a plate screw for attaching the decorative plate 70 to the front surface are provided.

  Up to three embedded wiring devices formed in unit dimensions can be attached to the mounting frame 60, and the body of the changeover switch 3 is one unit size (one module size), Since the container body of the outlet 4 is formed in a size corresponding to two unit dimensions (two module dimensions), the changeover switch 3 and the outlet 4 are embedded by using a common mounting frame 60. It is possible.

  Here, when the user performs an operation of switching the operation handle 31 of the changeover switch 3 to the grid interconnection operation side, the contact portion 32 is turned on or off according to the operation of the operation handle 31, and the operation mode is changed to the grid interconnection operation mode. A contact signal for switching to is input to the power conditioner 2. At this time, the control unit 20 turns on the disconnection switch 22 according to the contact signal from the changeover switch 3, turns off the self-sustained operation breaker 24, and connects the output of the inverter circuit 21 to the main line 53. The distributed power source composed of the panel 1 is connected to the commercial power system.

  On the other hand, when the user performs an operation of switching the operation handle 31 of the changeover switch 3 to the independent operation side, the contact portion 32 is turned off or on according to the operation of the operation handle 31, and a contact signal for switching the operation mode to the independent operation mode is generated. Input to the inverter 2. At this time, the control unit 20 turns off the disconnection switch 22 in accordance with the contact signal from the changeover switch 3 and also turns on the breaker 24 for independent operation, and the distributed power source is separated from the commercial power system. Power is supplied to the outlet 4. Here, when the output of the inverter circuit 21 is supplied to the outlet 4, a current flows to the neon lamp L through the resistor R and the neon lamp L is lit, so that the user switches from the lighting state of the neon lamp L to the outlet 4. It can be confirmed that power is supplied. When the user connects the plug 8a of the desired electrical device 8 to the plug connection portion 41 of the outlet 4, the electric power generated by the solar cell panel 1 and converted into alternating current by the inverter circuit 21 is supplied to the electrical device 8. For example, even when power cannot be received from the commercial power system due to an abnormality such as a power failure, the electric device 8 connected to the outlet 4 for independent operation can be operated.

  As described above, the power supply device A for autonomous operation includes both the changeover switch 3 as the operation mode switching operation unit and the outlet 4 as the autonomous operation outlet unit. The correspondence relationship between the changeover switch 3 operated to switch to the independent operation mode and the outlet 4 energized during the independent operation can be easily understood. That is, since it is possible to easily determine which switch should be operated in order to supply power from the outlet 4 during the self-sustained operation, user convenience is improved. Moreover, since the power supply device A for independent operation including the outlet 4 and the changeover switch 3 is provided separately from the power conditioner 2 including the inverter circuit 21 and the disconnection switch 22, the power conditioner 2 is Even when installed at a position above the wall, the power supply device A for independent operation can be installed at a height that can be reached by humans. The work of connecting the electrical equipment can be easily performed.

  In the present embodiment, the changeover switch 3 formed in one module size and the outlet 4 formed in two module size of the embedded wiring apparatus are attached to a common mounting frame 60 to provide a power supply device A for independent operation. However, a mode switching signal for selectively switching the operation mode to either the grid-connected operation mode or the independent operation mode is generated in one body attached to the attachment frame 60 according to the switching operation. You may provide the operation mode switching operation part and the outlet part for independent operation for supplying the electric power input from the breaker for independent operation to the said load. Further, the power supply device A for self-sustained operation is not limited to the embedded type, and the operation mode switching operation unit and the self-sustained operation outlet unit may be provided in a common container exposed on the construction surface. Good.

  Further, since the neon lamp L as an energization display means provided in the outlet 4 is turned on during the independent operation of the power conditioner 2, it is easy to determine whether or not the outlet 4 is energized from the lighting state of the neon lamp L. Can be determined. In the present embodiment, the neon lamp L connected between the pair of blade receiving members 43 via the resistor R constitutes the energization display means. However, the energization for detecting the energization state of the blade receiving member 43 is used. The energization display means may be constituted by a sensor and an informing means such as a buzzer or a lamp for informing the detection result of the energization sensor by sound or light.

  Further, since the power supply device A for independent operation outputs a contact signal as a mode switching signal for switching the operation mode, it is necessary to provide a communication circuit for performing communication with the power conditioner 2 in the power supply device A for autonomous operation. Therefore, the circuit configuration of the power supply device A for independent operation can be simplified.

  The power conditioner 2 needs to have a contact signal input interface. When the power supply device A for autonomous operation is added to the existing grid interconnection system, the existing power conditioner 2 has a contact signal input interface. If it is not provided, it is necessary to replace the expensive inverter 2. Therefore, a serial communication interface (for example, a communication port of RS485) originally provided in the power conditioner 2 is used, and a contact signal input from the power supply device A for autonomous operation is used as a serial communication interface provided in the power conditioner 2. A signal relay adapter that converts to a communication protocol and transmits it to the power conditioner 2 side may be provided between the power supply device A for autonomous operation and the power conditioner 2, and the existing power conditioner 2 can be used as it is. Therefore, the power supply device A for independent operation of the present embodiment can be used without replacing expensive equipment. Further, instead of including the signal relay adapter as described above, the power supply device A for independent operation is provided with a communication circuit that performs communication with the communication interface that the power conditioner 2 originally has. A mode switching signal may be transmitted.

  Further, in the present embodiment, the grid interconnection system using a solar cell panel as a distributed power source has been described as an example. However, the grid interconnection system is not limited to the above form, and a fuel cell or wind power generation is used as the distributed power source. The thing using equipment etc. may be used.

A Power supply device for autonomous operation AC Commercial AC power supply 1 Solar panel (distributed power supply)
2 Power conditioner 3 Changeover switch (Operation mode switching operation part)
4 Outlets (Outlet for independent operation)
5 Residential distribution board 20 Control unit (operation mode switching circuit)
21 Inverter circuit (power conversion)
22 Disconnection switch 24 Self-sustained operation breaker 32 Contact part 53 Trunk line 60 Mounting frame

Claims (3)

A power conversion unit that converts DC power supplied from a distributed power source into AC, a disconnection switch that is inserted between the main line connected to a commercial AC power source and the power conversion unit, and power is supplied during independent operation A grid-connected operation by opening and closing a breaker for independent operation and a breaker for independent operation according to a mode switching signal input from the outside, and a breaker for independent operation inserted between a load and the power converter. A power supply device for self-sustaining operation used in a grid interconnection system including an operation mode switching circuit that performs switching with self-sustaining operation,
An operation mode switching operation section for generating a mode switching signal for selectively switching the operation mode to either the grid interconnection operation mode or the independent operation mode according to the switching operation;
A self-sustained operation power supply apparatus comprising: a self-sustained operation outlet section for supplying power supplied from a power converter through a breaker for self-sustained operation to the load.   The power supply device for self-sustained operation according to claim 1, characterized in that an energization display means for displaying whether or not the self-sustained operation outlet section is energized is provided.   A power conditioner having the power converter, the disconnect switch, the breaker for independent operation, and the operation mode switching circuit, and the power supply device for independent operation according to any one of claims 1 and 2. A grid interconnection system characterized by comprising.

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