WO2011055193A1

WO2011055193A1 - Power distribution board and power distribution system

Info

Publication number: WO2011055193A1
Application number: PCT/IB2010/002742
Authority: WO
Inventors: 慶川口; 晃吉武; 傘谷　正人; 進　広和
Original assignee: パナソニック電工株式会社
Priority date: 2009-11-06
Filing date: 2010-10-28
Publication date: 2011-05-12
Also published as: JP2011101527A; JP5297981B2

Abstract

Disclosed is a power distribution board provided with an AC power distribution path connected to a regular-use power distribution path, a high voltage DC power distribution path whereupon high voltage greater than or equal to the maximum amplitude of the AC voltage to be applied to the AC power distribution path is applied, and a bidirectional power converter apparatus that is connected to the AC power distribution path and the high voltage DC power distribution path, converts DC power to AC power, and converts AC power to DC power.

Description

Specification Switchboard and distribution system Technical field

The present invention relates to a power distribution board and a power distribution system including the power distribution board. Background art

Conventionally, distribution systems installed in houses and the like include AC distribution lines (conduction bars) connected to commercial distribution lines, power conversion devices (power conversion units) that convert AC power into DC power, and power conversion devices. Some have a distribution board (distribution board) having a DC distribution path (conductive bar) connected to the device (for example, Patent Document 1).

In addition, in the switchboard of Patent Document 1, in response to the increase in DC devices that use DC power, such as communication devices and LED lighting, a DC wiring connection terminal unit for supplying power to these DC devices is provided. I was prepared. In addition, since many DC devices generally support low voltage, the power converter of Patent Document 1 converts AC power with a maximum amplitude of 20 V (—1 OOV to +10 OV) into DC power, for example. It had a voltage conversion function (DC / DC converter) that converts the obtained DC power to a low voltage of 60 V or less, for example. In other words, the DC distribution circuit was given a lower voltage than the AC distribution circuit.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2 0 0 8-4 2 9 9 8

By the way, when connecting high-voltage DC devices such as solar cells, storage batteries, and fuel cells to the distribution system of Patent Document 1, a voltage converter is interposed between each DC device and the DC distribution path, and each DC device It was necessary to transform significantly to match the corresponding voltage. For this reason, when DC power such as solar cells, storage batteries, or fuel cells is supplied to AC equipment connected to the AC distribution line, or when surplus DC power is reversely flowed through commercial distribution lines to sell electricity. It was necessary to step down the high-voltage DC power according to the voltage of the DC distribution circuit, and then step up the voltage again according to the voltage of the AC distribution circuit. For this reason, there is a problem that loss due to voltage transformation increases in the distribution path. Summary of the Invention

The present invention has been made in view of such circumstances, and provides a distribution board capable of suppressing loss associated with voltage transformation and a distribution system including the distribution board.

According to the embodiment of the present invention, the distribution board is connected to the AC distribution path connected to the regular distribution path, the high-voltage DC distribution path connected to the AC distribution path, and the AC distribution path and the high-voltage DC distribution path. And a bidirectional power conversion device for converting DC power to AC power and converting AC power to DC power. The high voltage DC distribution line may be applied with a high voltage equal to or greater than the maximum amplitude of the AC voltage applied to the AC distribution path.

According to this configuration, the high-voltage DC distribution line is given a voltage that is higher than the maximum amplitude of the AC voltage applied to the AC distribution line. Therefore, when connecting high-voltage DC equipment, There is no need to boost the voltage when DC power is converted into AC power by a bidirectional power converter and distributed to the AC distribution line. Therefore, loss due to transformation can be suppressed.

The distribution board may further include a low voltage DC distribution circuit to which a voltage lower than that of the high voltage DC distribution circuit is provided, and a voltage converter connected to the high voltage DC distribution circuit and the low voltage DC distribution circuit.

According to this configuration, it is equipped with a low-voltage DC distribution circuit that can provide a lower voltage than a high-voltage DC distribution circuit, so that high-voltage DC devices are connected to the high-voltage DC distribution circuit, while low-voltage DC devices are connected. By connecting to a low voltage DC distribution line, it is not necessary to provide a voltage converter for each low voltage DC device. Therefore, the configuration can be simplified and the loss due to the transformation can be suppressed.

The distribution board includes: an AC conductive bar that constitutes the AC distribution path; a high-voltage DC conduction that constitutes the high-voltage DC distribution path; and a low-voltage DC conduction that constitutes the low-voltage DC distribution path; And at least two conductive bars of the AC conductive bar, the high-voltage DC conductive bar, and the low-voltage DC conductive bar may be stacked in the thickness direction.

According to this configuration, since at least two of the AC conductive bar, the high-voltage DC conductive bar, and the low-voltage DC conductive bar are arranged in the thickness direction, an increase in the size of the apparatus can be suppressed. it can.

The high-voltage DC distribution path may be connected to DC power generation means.

According to this configuration, when surplus DC power generated by the DC power generation means is caused to flow backward to the commercial distribution line side, loss due to transformation can be suppressed.

The power distribution system includes the power distribution board.

According to this structure, the same effect as the said switchboard can be obtained. The invention's effect

ADVANTAGE OF THE INVENTION According to this invention, the switchboard which can suppress the opening | mouth which accompanies voltage transformation and a switchboard system provided with this switchboard can be provided.

Brief Description of Drawings

Objects and features of the present invention will become apparent from the following description of the preferred embodiment given in conjunction with the accompanying drawings.

FIG. 1 is an explanatory diagram showing a configuration of a power distribution system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a switchboard according to an embodiment of the present invention.

FIG. 3 is an external perspective view of a switchboard according to an embodiment of the present invention. FIG. 4 is a front view showing a part of the arrangement in the switchboard according to the embodiment of the present invention.

[Fig. 5] (a) is an explanatory diagram of AC voltage, (b) is an explanatory diagram of the configuration of the AC trunk line and AC breaker.

6 is a cross-sectional view taken along line VI—VI in FIG.

7 is a cross-sectional view taken along line VII-VII in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which form a part of this specification. Parts that are the same or similar throughout the drawings will be given the same reference numerals, and redundant descriptions thereof will be omitted.

As shown in Fig. 1, the house is provided with a power supply system 1 that supplies power to various devices (lighting equipment, air conditioners, home appliances, audiovisual equipment, etc.) installed in the home. The power supply system 1 operates various devices using household commercial AC power (AC power) 2 as power, and also supplies the power of solar cells 3 generated by sunlight as power to various devices. The power supply system 1 supplies power not only to the DC device 5 that operates by inputting a DC power source (DC power source) but also to the AC device 6 that operates by inputting an AC power source (AC power source).

The power supply system 1 is provided with a control unit 7 and a DC distribution board (built-in DC breaker) 8 as the distribution board of the system 1. In addition, the power supply system 1 is provided with a control unit 9 and a release unit 10 as devices for controlling the operation of the DC device 5 in the house.

The control unit 7 is connected to an AC distribution board 11 1 for branching an AC power supply via an AC power line 12. The control unit 7 is connected to the commercial AC power supply 2 via the AC distribution board 11 and connected to the solar cell 3 via the DC power line 13. The control unit 7 takes in AC power from the AC distribution board 11 and also takes in DC power from the solar battery 3, and converts these powers into predetermined DC power as a device power source. Then, the control unit 7 outputs the converted DC power to the DC distribution board 8 via the DC power line 14 or to the storage battery 16 via the DC power line 15. To store electricity. The control unit 7 not only takes in AC power from the AC distribution board 11 but also converts DC power from the solar cell 3 and storage battery 16 into AC power and supplies it to the AC distribution board 11 Is possible. The control unit 7 exchanges data with the DC distribution board 8 via the signal line 17.

The DC distribution board 8 is a kind of breaker that supports DC power. The DC distribution board 8 branches the DC power input from the control unit 7 and outputs the DC power after branching to the control unit 9 via the DC power line 1 8 or the DC power line 1 Or output to relay unit 10 via 9. Further, the DC distribution board 8 exchanges data with the control unit 9 through the signal line 20 and exchanges data with the relay unit 10 through the signal line 21. A plurality of DC devices 5 are connected to the control unit 9. These DC devices 5 are connected to a control unit 9 via a DC supply line 22 that can carry both DC power and data by a pair of wires. The direct current supply line 2 2 superimposes a communication signal for transmitting data by a high frequency carrier wave on the direct current voltage used as the power source of the DC device 5. Transport to DC device 5. The control unit 9 acquires the DC power source of the DC device 5 through the DC power line 1 8, and based on the operation command obtained from the DC distribution board 8 through the signal line 2 0, which DC device 5 Figure out how to control. Then, the control unit 9 controls the operation of the DC device 5 by outputting a DC voltage and an operation command to the instructed DC device 5 via the DC supply line 22.

The control unit 9 is connected via a DC supply line 22 to a switch 23 that is operated when switching the operation of the DC device 5 in the house. Further, for example, a sensor 24 for detecting a radio wave transmitted from an infrared ray remote controller is connected to the control unit 9 via a DC supply line 22. Therefore, not only the operation instruction from the DC distribution board 8 but also the operation of the switch 23 and the detection of the sensor 24, the communication signal is sent to the DC supply line 22 and the DC device 5 is controlled.

A plurality of DC devices 5 are connected to the relay unit 10 via individual DC power lines 25, respectively. The relay unit 10 acquires the DC power supply of the DC device 5 through the DC power line 19 and determines which DC device 5 based on the operation command obtained from the DC distribution board 8 through the signal line 21. Figure out what will work. Then, the relay unit 10 controls the operation of the DC device 5 by turning on and off the power supply to the DC power line 25 with a built-in relay with respect to the instructed DC device 5. In addition, the relay unit 10 is connected to a plurality of switches 26 for manually operating the DC device 5. By operating the switches 26, the power supply to the DC power line 25 can be relayed. The DC device 5 is controlled by turning on and off.

For example, a wall outlet or a floor outlet is connected to the DC distribution board 8 via a DC power line 28. If a DC device plug (not shown) is inserted into the DC outlet 27, DC power can be supplied directly to the device.

Between the commercial AC power source 2 and the AC distribution board 11, an electric power meter 29 that can remotely measure the usage amount of the commercial AC power source 2 is connected. The power meter 29 is equipped not only with a remote meter reading function for commercial power consumption, but also with, for example, power line carrier communication and wireless communication functions. The power meter 29 transmits the meter reading result to an electric power company or the like via power line carrier communication or wireless communication.

The power supply system 1 is provided with a network system 30 that enables various devices in the home to be controlled by network communication. The network system 30 is provided with a home server 31 as a control unit of the system 30. The in-home server 3 1 is connected to the management server 3 2 outside the home via a network N such as the Internet, and is connected to the in-home equipment 3 4 through a signal line 33. The in-home server 3 1 operates using DC power acquired from the DC distribution board 8 via the DC power line 35 as a power source. A control box 36 that manages operation control of various devices in the home by network communication is connected to the home server 31 via a signal line 37. The control box 36 is connected to the control unit 7 and the DC distribution board 8 via the signal line 17 and can directly control the DC device 5 via the DC supply line 38. The control box 36 is connected to, for example, a gas / water meter 39 that can remotely measure the amount of gas and water used, and is connected to an operation panel 40 of the network system 30. The operation panel 40 is connected to a monitoring device 41 including, for example, a door phone slave, a sensor, and a camera.

When the home server 31 receives an operation command for various devices in the home via the network N, the home server 31 notifies the control box 36 and instructs the control box so that the various devices operate according to the operation command. 3 Operate 6. In addition, the home server 3 1 can provide various information acquired from the gas / water meter 39 to the management server 3 2 through the network N, and that the monitoring device 4 1 has detected an abnormality. When accepted from the operation panel 40, this is also provided to the management server 32 via the network N.

In this embodiment, the control unit 7, the DC distribution board 8, the AC distribution board 11, the AC power line 1 2, and the DC power line 14 are the components of the distribution board (AC / DC hybrid distribution board) 4 2. It has become.

Next, the electrical configuration of the switchboard 42 will be described with reference to FIG.

As shown in FIG. 2, the switchboard 42 is connected to the commercial AC power supply 2 via the service port wiring 51 connected to the commercial power distribution line 50 of the electric power company. The switchboard 42 is provided with a limiter 52, a main breaker 53, an AC main line 54, an AC breaker 55, and an interconnection breaker 56. The limiter 5 2, main trunk breaker 5 3, AC trunk line 5 4, AC breaker 5 5, and interconnection breaker 5 6 constitute the AC distribution board 11.

Limiter 52 is an ampere breaker that automatically shuts off the circuit when a current exceeding the limit set based on a contract with a power company that provides commercial AC power supply 2 flows. The main breaker 53 is a leakage breaker that breaks the circuit when an abnormal current flows due to a leakage or short circuit.

The AC main line 5 4 constituting the AC power line 1 2 is connected to the commercial AC power source 2 via the main breaker 53, and the branch circuit branched from the AC main line 5 4 is connected to the AC breaker 5 5 or the interconnection. Breaker 5 6 is connected.

The AC breaker 55 and the interconnection breaker 56 are branch breakers (wiring breakers) that cut off the circuit when the current flowing through the branch circuit from the AC trunk line 54 exceeds a predetermined threshold. Note that the AC blur force 55 and the interconnection breaker 56 are provided to correspond to each connected AC device 6 or each connected power system, and the number of installations can be arbitrarily changed.

In addition, the switchboard 42 has a bi-directional converter 5 8 as a bi-directional power converter, a high-voltage DC main line 5 9 constituting a high-voltage DC distribution circuit, a D CZ DC converter 6 0 to 6 3 as a voltage converter, and a low-voltage DC Main line 6 4, DC breaker 6 6, control unit 6 7 and interconnection breaker 6 8 Is provided. The bidirectional converter 58, the DCZDC converters 60 to 63, and the control unit 67 constitute a control unit 7. The high-voltage DC main line 59, the low-voltage direct current main line 64, the DC breaker 66, and the interconnection breaker 68 constitute the DC distribution board 8.

The bidirectional converter 58 is connected to the AC main line 54 via the interconnection breaker 56 and also connected to the high-voltage DC main line 59. The bidirectional converter 58 converts AC power input from the AC main line 54 side into DC power and outputs it to the high voltage DC main line 59 side, and DC power input from the high voltage DC main line 59 side. A D CZA C inverter that converts AC power and outputs it to the AC main line 54 side, and a D CZD C converter that transforms DC voltage are built-in.

An interconnection breaker 68 is connected to a plurality of branch circuits branched from the high-voltage DC main line 59 constituting the DC power line 14, and DCZDC converters 60 to 63 are connected to the interconnection breakers 68, respectively. The interconnection breaker 68 is a branch breaker (wiring breaker) that cuts off the circuit when the current flowing through the branch circuit from the high-voltage DC main line 59 exceeds a predetermined threshold. The number of installation of the circuit breaker 68 can be arbitrarily changed according to need. In FIG. 2, the connection breaker 68 and the DCZDC converter are connected to connect the fuel cell 4 to the power supply system 1 of FIG. An example in which 62 is added is shown.

The DCZDC converter 60 converts the DC voltage input from the solar cell 3 as a DC power generation means into a predetermined value and outputs it to the high voltage DC main line 59 side. Note that the control unit 7 controls the solar cell 3 connected to the high-voltage DC main line 59 so as to operate at the maximum power point in order to efficiently extract power. However, since the power generation output of the solar cell 3 fluctuates depending on the climatic conditions and time zone, for example, the DCVDC converter 60 adjusts the output voltage of 120V to 350V to a constant value and outputs it to the high voltage DC main line 59.

The DCZDC converter 61 transforms the DC voltage discharged from the storage battery 16 and outputs it to the high-voltage DC main line 59 side, or transforms the DC voltage input from the high-voltage DC main line 59 side and outputs it to the storage battery 16 side. To do. The DCZDC converter 62 converts the DC voltage input from the fuel cell 4 into a predetermined value and outputs it to the high voltage DC main line 59 side.

The DC / DC converter 63 is connected to the high-voltage DC main line 59 via the interconnection breaker 68 and also connected to the low-voltage DC main line 64. The DC / DC converter 63 steps down the DC voltage input from the high voltage DC main line 59 and outputs it to the low voltage DC main line 64 side.

The primary side of a plurality of DC breakers 66 is connected to the branch circuit branched from the low-voltage DC main line 64. The DC breaker 66 is a branch breaker (wiring breaker) that shuts off the circuit when the current flowing through the branch circuit from the low-voltage DC main line 64 exceeds a specified threshold. Every DC device connected to the secondary side The number of installations can be changed arbitrarily.

Next, the arrangement of the switchboard 42 will be described with reference to FIGS.

As shown in FIG. 3, the switchboard 42 includes a housing 70 that accommodates each of the above-described components, and is attached to, for example, a wall surface near the ceiling of a house. A lid 71 that can be opened and closed is provided on the front side of the housing 70, and an opening 72 is provided in the lid 71. As shown in FIG. 4, a main breaker 53 is arranged on one end side in the left direction (left end side in FIG. 3) in the casing 70, and one direction from the main breaker 53 (right side in FIG. 3). AC trunk line 54 is arranged so as to extend along the direction. In addition, a bidirectional comparator 58 is disposed at a position adjacent to the right side of the AC trunk line 54.

An AC breaker 55 and an interconnection breaker 56 are provided along the AC trunk line 54 in a vertical direction adjacent to the AC trunk line 54 along one direction (the left-right direction in FIG. 3). Although the positions of the AC breaker 55 and the interconnection breaker 56 can be arbitrarily changed, the interconnection breaker 56 connected to the bidirectional converter 58 is preferably arranged on the right side.

From the bidirectional converter 58, a high-voltage DC main line 59 is arranged so as to extend in one direction (right direction in FIG. 3). In addition, a low-voltage DC trunk line 64 is placed on the front side of the high-voltage DC trunk line 59 (opening 72 side). The AC main line 54, the high-voltage DC main line 59, and the low-voltage DC main line 64 are fixed to the casing 70 in a state of being separated from each other in the front-rear direction by a fixing tool 73 made of an insulator.

A DC breaker 66, an interconnection breaker 68 and a voltage conversion module 74 are arranged along one direction (left and right in FIG. 3) at positions adjacent to the high-voltage DC main line 59 and the low-voltage DC main line 64 in the vertical direction. The The voltage conversion module 74 is an integrated circuit breaker 68 (68) and DCZDC converter 63 (see FIG. 2).

Next, the configurations of the AC main line 54 and the AC breaker 55 will be described based on FIG. 5 (b).

As shown in Fig. 5 (b), the AC main line 54 is connected to the secondary poles (L 1, L 2, N) of the main breaker 53, respectively. Consists of 54 c. The AC conductive bars 54 a and 54 b are voltage lines (L 1 and L 2) to which a predetermined potential (for example, an AC voltage with an execution value of 1 OOV applied from the commercial AC power supply 2) is applied. Is the grounded neutral line (N). The AC conductive bars 54a, 54b, 54c are all formed with the same width (vertical length), length (horizontal length) and thickness (front / rear length). ing.

The AC breaker 55 includes a power supply side terminal 55a connected to the AC main line 54, an opening / closing mechanism 55, a load side terminal 55c connected to the power supply side terminal 55a via the opening / closing mechanism 55b, and an opening / closing mechanism operation. Part 55d. The AC breaker 55 has three insertion recesses 55e into which the three AC conductive bars 54a, 54b, 54c that overlap in the thickness direction can be inserted. It is a plug-in terminal that can be connected to 54 in an inserted manner.

When the corresponding voltage of the AC breaker 55 is 100 V, the power supply side terminal 55a is connected to the voltage line (AC conductor bar 54a or AC conductor bar 54b) and neutral line (AC conductor bar). 5 4 Connected to c) (see Fig. 5 (b)). If the corresponding voltage of AC breaker 55 is 20 OV, power supply side terminal 55a is connected to two voltage lines (AC conductive bar 54a and AC conductive bar -54b) (not shown) . Therefore, plug the AC breaker 55 into the AC main line 54. The AC power supply terminal 55a of the AC breaker 55 is electrically connected to the AC main line 54, and the AC device 6 connected to the load side terminal 55c of the AC breaker 55 has an effective value of 100 V or 20 OV. AC current is supplied. Note that the opening / closing mechanism operation portion 55 d of the AC breaker 55 is disposed at a position corresponding to the opening 72 of the housing 70 in a state where the AC breaker 55 is inserted into the AC main line 54.

Next, the configuration of the high-voltage DC main line 59, the interconnection breaker 68, the voltage conversion module 74, the low-voltage DC main line 64, and the DC breaker 66 will be described with reference to FIGS.

As shown in Fig. 6, the high-voltage DC main line 59 is composed of a pair of DC conductive bars 59a and 59, and the low-voltage DC trunk line 64 is composed of a pair of DC conductive bars 64a and 64b. The The DC conductive bars 59a and 64a constitute the positive pole (+), and the DC conductive bars 59b and 64b constitute the negative pole (one). Further, the DC conductive bars 59a and 59b and the DC conductive bars 64a and 64b are formed to have the same width, length and thickness.

As shown in FIG. 7, the interconnection breaker 68 is connected to the power supply side terminal 68 a connected to the high voltage DC main line 59, the switching mechanism 68 b, and the power supply side terminal 68 a via the switching mechanism 68 b. A load-side terminal 68 c and an opening / closing mechanism operation unit 68 d are provided. In addition, the interconnection breaker 68 is provided with four insertion recesses 68e into which the conductive bars for DC that overlap in the thickness direction can be inserted 59 a. 59 b, 64 a, 64 b, and the power supply side terminal 68 a Is a plug-in terminal that can be connected to the high-voltage DC main line 59 in a plug-in manner.

When the interconnection breaker 68 is inserted into the high-voltage DC trunk line 59 and the low-voltage DC trunk line 64, the power supply side terminal 68a of the interconnection breaker 68 is electrically connected to the high-voltage DC trunk line 59. The opening / closing mechanism operation unit 68d of the linkage break force 68 is located at a position corresponding to the opening 72 of the casing 70 when the linkage breaker 68 is inserted into the high-voltage DC main line 59 and the low-voltage DC main line 64. Placed in

As shown in FIG. 6, the voltage conversion module 74 includes an interconnection breaker 68M and a DCZDC converter 63. The interconnection breaker 68 M has a power supply side terminal 68 a connected to the high voltage DC main line 59, an opening / closing mechanism 68 b, and a load side terminal 68 connected to the power supply side terminal 68 a via the opening / closing mechanism 68 b. And an opening / closing mechanism operation unit 68d. The DCZDC converter 63 includes a high voltage side terminal 63 a connected to the load side terminal 68 c of the interconnection breaker 68 M, a voltage conversion mechanism 63 b, and a low voltage side terminal 63 c connected to the low voltage DC main line 64 c. With.

The voltage conversion module 74 includes four insertion recesses 74 e into which four DC conductive bars 59 a, 59 b, 64 a, and 64 b that overlap in the thickness direction can be inserted. In addition, the power supply side terminal 68a of the interconnection breaker 68M is a plug-in terminal that can be connected to the high-voltage DC main line 59 in a plug-in manner, and the low-voltage side terminal 63c of the DC / DC comparator 63 is a low-voltage terminal. It is a plug-in terminal that can be connected to the DC main line 64 in a plug-in manner.

When the voltage conversion module 74 is inserted into the high-voltage DC main line 59 and the low-voltage DC main line 64, the high-voltage side terminal 63a is connected to the high-voltage DC main line 59. The voltage is stepped down and output to the low voltage DC main line 64 side via the low voltage side terminal 63c. The open / close mechanism operation unit 68d of the interconnection breaker 68M is located at a position corresponding to the opening 72 of the casing 70 in a state where the voltage conversion module 74 is inserted into the high-voltage DC main line 59 and the low-voltage DC main line 64. Be placed.

As shown in FIGS. 6 and 7, the DC breaker 66 is connected to the power supply side terminal 66a connected to the low voltage DC main line 64, the switching mechanism 66b, and the power supply side terminal 66a via the switching mechanism 66b. A load side terminal 66 c and an opening / closing mechanism operating part 66 d. The DC breaker 66 also has four insertion recesses 66e into which the DC conductive bars 59a, 59b, 64a, 64b that overlap in the thickness direction can be inserted. It is a plug-in terminal that can be connected to the DC main line 64 in a plug-in manner.

When the DC breaker 66 is inserted into the high voltage DC main line 59 and the low voltage DC main line 64, the power source side terminal 66a of the DC breaker 66 is electrically connected to the low voltage DC main line 64, and the load side terminal 66 of the DC breaker force 66 is The DC device 5 connected to c is supplied with a direct current at a low pressure (for example, 48 V). The open / close mechanism operating portion 66 d of the DC breaker 66 is disposed at a position corresponding to the opening 72 of the housing 70 in a state where the DC breaker 66 is inserted into the high-voltage DC main line 59 and the low-voltage DC main line 64.

Next, the operation of the switchboard 42 will be described.

As shown in Fig. 5 (a), the AC voltage of commercial AC power supply 2 is the maximum value Vm = 11.4.4 V and the maximum amplitude V p-p = 2 x Vm, assuming the effective value V rms = 100 V. = 282. 8V. Therefore, an AC voltage having a maximum value Vm = 1 41. 4 V and a maximum amplitude Vp—p = 282.8 V is applied to the AC main line 54.

On the other hand, the high voltage DC main line 59 is supplied with a voltage higher than the maximum amplitude of the AC voltage applied to the AC main line 54. For example, when the AC voltage of the AC main line 54 has the maximum amplitude V p-p = 282.8 V, a DC voltage of 30 OV is applied to the high-voltage DC main line 59. That is, the bidirectional converter 58 converts the AC power input from the AC main line 54 into DC power, boosts the converted DC voltage to 30 OV, and outputs it to the high-voltage DC main line 59. In addition, the output voltage to the high voltage DC main line 59 side in the DC DC converters 60 to 62 is set to 300V. The potential (voltage) applied to the high-voltage DC main line 59 can be arbitrarily set according to the AC voltage of the AC main line 54, the output voltages of the solar cell 3 and the storage battery 16 and the like.

Further, a DC voltage lower than that of the high voltage DC main line 59 is applied to the low voltage DC main line 64. In other words, the DC / DC converter 63 steps down the DC voltage 300 V of the high-voltage DC main line 59 to 60 V or less (for example, 48 V). The DC voltage applied to the low voltage DC main line 64 can be arbitrarily set in consideration of the corresponding voltage of the DC device 5 connected to the DC bracing force 66.

In the power supply system 1, when the power generation amount of the solar cell 3 and the fuel cell 4 exceeds the power consumption amount of the DC device 5, the bidirectional power converter 58 converts the DC power into the AC power, and the AC power line. 1 Control unit 67 controls to supply power to 2 side. In addition, if the amount of power generated by solar cell 3 is sufficient to cover the amount of power consumed by AC device 6, surplus power is stored in storage battery 16. It is charged. Furthermore, when the storage battery 16 is also fully charged, a reverse power flow may occur in which surplus power returns to the utility company's commercial distribution line 50 side.

Here, if a contract has been made to sell electricity generated by the solar cell 3 or the like to an electric power company, the voltage and frequency can be used to reverse the power flow to the commercial distribution line 50 side of the electric power company. It is necessary to make adjustments so as to be within the prescribed range determined by the company. For example, when a reverse power flow is performed, it is necessary to convert the generated DC current into AC current, and a voltage close to 1 0 1 V, which is 1 V higher than the actual AC power supply 2 running value of 1 0 OV (for example, 1 If 0 1 V plus or minus 6 V and the actual value 2 0 0 V, it must be 2 0 2 V plus or minus 2 OV).

In this regard, in the present embodiment, the direct current generated by the solar cell 3 or the like is distributed to the high-voltage DC main line 59 via the DC / DC converter 60 at 30 OV and then bidirectional. The power is distributed to the AC main line 5 4 having a maximum amplitude of 2 8 2.8 V via the converter 5 8. That is, the electric power generated by the solar cell 3 or the like is reversely flowed to the commercial distribution line 50 side without greatly reducing the voltage on the way.

According to this embodiment described above, the following effects can be obtained.

(1) Since the high voltage DC main line 5 9 is given a voltage higher than the maximum amplitude Vp-p of the AC voltage applied to the AC main line 5 4, connect a high voltage solar cell 3 or storage battery 16 In this case, there is no need for significant transformation or boosting when DC power is converted to AC power by bidirectional converter 58 and distributed to AC main line 54. For example, the output voltage of solar cell 3 is often higher than the corresponding voltage of communication devices, etc., so if solar cell 3 is connected to low-voltage DC main line 6 4, it is necessary to significantly transform it. By connecting to the high-voltage DC main line 59, the width of the transformer can be kept small. Therefore, loss due to transformation can be suppressed.

(2) Since the low-voltage DC main line 6 4 to which a voltage lower than that of the high-voltage DC main line 59 is provided, DC devices (solar cell 3, fuel cell 4 and storage battery 16) compatible with high voltage are connected to the high-voltage DC main line 59. On the other hand, by connecting the low-voltage DC equipment 5 to the low-voltage DC main line 6 4, it is not necessary to provide a DCZ DC converter 63 for each low-voltage DC equipment 5. Therefore, the configuration can be simplified and the noise associated with the transformation can be suppressed.

(3) The conductive bar constituting the AC trunk line 5 4, the conductive bar constituting the high-voltage DC trunk line 59, and the conductive bar constituting the low-voltage DC trunk line 6 4 are arranged in the thickness direction. Since they are arranged in an overlapping manner, the increase in size of the apparatus can be suppressed.

(4) Since the solar cell 3 is connected to the high-voltage DC main line 59, to which a voltage higher than that of the AC main line 5 4 is applied, the surplus DC power generated by the solar cell 3 flows backward to the commercial distribution line 50 side. In addition, loss associated with voltage transformation can be suppressed.

(5) By providing the high-voltage DC main line 59, even when using high-voltage DC equipment 5, if connected to the high-voltage DC main line 59, high-voltage DC power can be supplied without significant transformation. Can do.

(6) By placing the high-voltage DC trunk line 59 and the low-voltage DC trunk line 6 4 in the thickness direction (front-rear direction perpendicular to the left-right direction, which is one direction), the DC breaker 6 6 and the interconnect breaker 6 8 The connection space can be used efficiently. That is, DC breaker 6 6 for low pressure and high pressure The connection space of the corresponding interconnection breaker 68 can be shared at positions adjacent to the high-voltage DC main line 59 and the low-voltage DC main line 64 in the vertical direction. For example, when the storage battery 16 and the fuel cell 4 are not provided, a large number of DC breakers 66 can be arranged in parallel, so that the connection space can be utilized without waste.

(7) Of the high-voltage DC main line 59 and the low-voltage DC main line 64, the lower voltage DC low-voltage main line 64 is arranged on the opening 72 side of the housing 70, so that the high-voltage DC main line 59 is far from the opening 72. It can be avoided.

(8) Since the voltage conversion module 74 includes the interconnection breaker 68M and the DCZDC converter 63, the exposed wiring can be reduced and the space in the switchboard 42 can be used efficiently.

(9) AC breaker 55, DC breaker 66, interconnection breakers 56 and 68, and voltage conversion module 74 are equipped with plug-in terminals that can be connected in a plug-in manner, making connection work easy and easy connection The position can be changed.

(1 0) Interconnection breaker 68, voltage conversion module 74, and DC breaker 66 have four DC conductive bars 59 a, 59 b, 64 a, 64 b that can be inserted in the thickness direction. Since the insertion recesses 68 e, 74 Θ, 66 e are provided, the thickness can be unified.

(1 1) The power supply side terminal 68 a of the interconnection breaker 68 is electrically connected only to the high voltage DC main line 59, while the power supply side terminal 66 a of the DC breaker 66 is only connected to the low voltage DC main line 64. Since it is electrically connected, incorrect connection can be suppressed.

In addition, the said embodiment can also be changed and implemented as follows.

• The high-voltage DC main line 59 and the low-voltage DC main line 64 may be arranged at positions adjacent to the AC main line 54 in the vertical direction.

■ A high voltage DC breaker may be connected to the branch circuit from the high voltage DC main line 59. • The size (width, length, thickness) of each conductive bar can be set arbitrarily. • AC distribution lines, high-voltage DC distribution lines, and low-voltage DC distribution lines do not necessarily have to be composed of conductive bars.

■ The branch breaker (DC breaker 66 and interconnection breaker 68) does not have to have four insertion recesses corresponding to the two trunk lines (four conductive bars) that overlap in the thickness direction. For example, two insertion recesses corresponding to only the high voltage DC main line 59 or only the low voltage DC main line 64 that are electrically connected may be provided.

'Each conductive bar is not limited to the left-right direction, and any direction can be the longitudinal direction (extending direction).

■ The high-voltage DC main line 59 and the low-voltage DC main line 64 do not have to be electrically conductive and / or stacked in the same thickness direction, and the combination and number of trunk lines to be stacked may be changed. A plurality of main lines may be provided. For example, when a plurality of low-voltage DC trunk lines are provided, the low-voltage DC trunk lines may be stacked in the thickness direction.

■ DC power generation means is not limited to solar cells 3 Any power generation means such as wind, geothermal, biomass, etc. Can be adopted.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these specific embodiments, and various changes and modifications can be made without departing from the scope of the subsequent claims. It can be said that it belongs to the category of the present invention.

Claims

The scope of the claims

[Claim 1]

An AC distribution path connected to a commercial distribution path; a high-voltage DC distribution path connected to the AC distribution path; and connected to the AC distribution path and the high-voltage DC distribution path to convert DC power into AC power and A distribution board comprising a bidirectional power conversion device that converts electric power into DC power.

[Claim 2]

The switchboard according to claim 1, wherein the high-voltage DC distribution path is provided with a high voltage that is greater than or equal to a maximum amplitude of an AC voltage applied to the AC distribution path.

[Claim 3]

The distribution board according to claim 2, further comprising: a low voltage DC distribution circuit to which a voltage lower than the high voltage DC distribution circuit is applied; and a voltage converter connected to the high voltage DC distribution circuit and the low voltage DC distribution circuit. .

[Claim 4]

Further comprising: an AC conductive material constituting the AC power distribution circuit; and a high-voltage direct current conductive bar constituting the high-voltage direct current distribution line; and a low-voltage direct current conductive bar constituting the low-voltage direct current distribution line, 4. The switchboard according to claim 3, wherein at least two of the AC conductive bar, the high-voltage DC conductive bar, and the low-voltage DC conductive bar are arranged in the thickness direction.

[Claim 5]

The switchboard according to any one of claims 2 to 4, wherein the high-voltage DC distribution path is connected to DC power generation means.

[Claim 6]

A power distribution system comprising the power distribution board according to any one of claims 2 to 5.