JP2012249451A - Power conversion apparatus - Google Patents

Power conversion apparatus Download PDF

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JP2012249451A
JP2012249451A JP2011120090A JP2011120090A JP2012249451A JP 2012249451 A JP2012249451 A JP 2012249451A JP 2011120090 A JP2011120090 A JP 2011120090A JP 2011120090 A JP2011120090 A JP 2011120090A JP 2012249451 A JP2012249451 A JP 2012249451A
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power
power supply
inverter unit
unit
leakage
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Hiroaki Koshin
博昭 小新
Masataka Kanda
雅隆 神田
Takuya Kagawa
卓也 香川
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Panasonic Corp
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Panasonic Corp
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Abstract

PROBLEM TO BE SOLVED: To detect electric leakage and ground fault even under a separated state from a power system.SOLUTION: A power conversion apparatus 1 includes an inverter section 10 that converts DC power into AC power and a ground circuit that individually grounds a pair of output ends of the inverter section 10 through current limit elements 11, 12. Accordingly, an output end of the inverter section 10 is grounded by the ground circuit and thus electric leakage and ground fault can be detected even under a separated state from a power system.

Description

本発明は、発電装置で発電された電力を所望の電力に変換して負荷に供給する電力変換装置に関する。   The present invention relates to a power converter that converts power generated by a power generator into desired power and supplies the power to a load.

従来、太陽電池(発電装置)で発電された直流電力をパワーコンディショナ(電力変換装置)で交流電力に変換した後に負荷に供給する太陽光発電システム(電力供給システム)が提供されている(例えば、特許文献１参照)。   Conventionally, a photovoltaic power generation system (power supply system) that supplies DC power to a load after converting DC power generated by a solar cell (power generation device) into AC power by a power conditioner (power conversion device) is provided (for example, , See Patent Document 1).

特許文献１記載の従来例は、系統連系形の太陽光発電システムであって、そのパワーコンディショナは、系統連系運転と自立運転の２つの運転モードが切り換えられるようになっている。そして、特許文献１記載のパワーコンディショナは、太陽電池の直流出力を交流に変換するインバータを備え、自立運転時には解列開閉器により電力系統から系統分離されるとともに、自立運転用ブレーカを介して自立運転用給電装置(コンセント)に給電する。   The conventional example described in Patent Document 1 is a grid-connected photovoltaic power generation system, and the power conditioner can be switched between two operation modes of grid-connected operation and independent operation. And the power conditioner of patent document 1 is provided with the inverter which converts the direct current output of a solar cell into alternating current, and while it is system-separated from an electric power system by a disconnection switch at the time of self-sustained operation, it is via a breaker for self-sustained operation. Power is supplied to the power supply device (outlet) for independent operation.

特開２０１０−２５９１７０号公報JP 2010-259170 A

ところで、自立運転時のパワーコンディショナのように電力系統から独立した電力変換装置においては、漏電や地絡(以下、漏電等と略す。)を検出して給電路を遮断する機能が設けられていなかった。つまり、給電路に発生する漏電等の検出には、通常、零相変流器が用いられるが、漏電等によって給電路に流れる不平衡電流を零相変流器で検出するためには、少なくともインバータの出力側で給電路が接地されていなければならない。しかしながら、上記従来例ではインバータの出力側で給電路が接地されていないために漏電等を検出することができなかった。   By the way, in a power converter independent of the power system, such as a power conditioner during self-sustained operation, a function of detecting a leakage or a ground fault (hereinafter abbreviated as a leakage) is provided. There wasn't. In other words, a zero-phase current transformer is usually used to detect a leakage generated in the power supply path, but at least in order to detect an unbalanced current flowing in the power supply path due to a leakage current or the like with the zero-phase current transformer, at least The feed line must be grounded on the output side of the inverter. However, in the above conventional example, since the power feeding path is not grounded on the output side of the inverter, it is not possible to detect a leakage or the like.

本発明は、上記課題に鑑みて為されたものであり、電力系統から切り離された状態でも漏電や地絡の検出を可能とすることを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to detect an electric leakage or a ground fault even when disconnected from a power system.

本発明の電力変換装置は、直流電力を交流電力に変換するインバータ部と、当該インバータ部が具備する複数の出力端のうちで電力系統から切り離されている少なくとも何れか１つの出力端を接地する接地回路とを備えることを特徴とする。   The power conversion device of the present invention grounds at least one output terminal disconnected from the power system among the plurality of output terminals provided in the inverter unit and the inverter unit that converts DC power into AC power. And a ground circuit.

この電力変換装置において、前記接地回路は、電流制限素子を介して前記出力端を接地してなることが好ましい。   In this power conversion device, it is preferable that the ground circuit is configured such that the output terminal is grounded via a current limiting element.

この電力変換装置において、前記インバータ部は一対の出力端を具備し、前記接地回路は、当該一対の出力端をそれぞれ電流制限素子を介して各別に接地してなることが好ましい。   In this power conversion device, it is preferable that the inverter unit includes a pair of output terminals, and the grounding circuit grounds the pair of output terminals individually via current limiting elements.

この電力変換装置において、前記インバータ部の出力側若しくは前記接地回路の出力側に設けられて給電路に流れる不平衡電流を検出する電流検出器と、当該電流検出器で検出される不平衡電流が所定のしきい値を超えた場合に前記インバータ部から前記給電路への電力供給を停止させる電力供給停止手段とを備えることが好ましい。   In this power conversion device, a current detector that is provided on the output side of the inverter unit or the output side of the ground circuit and detects an unbalanced current flowing in a power feeding path, and an unbalanced current detected by the current detector It is preferable to include a power supply stop unit that stops power supply from the inverter unit to the power supply path when a predetermined threshold value is exceeded.

この電力変換装置において、前記インバータ部の入力側に設けられた漏電検出部と、当該漏電検出部で漏電が検出された場合に前記インバータ部から前記給電路への電力供給を停止させる電力供給停止手段とを備えることが好ましい。   In this power conversion device, a leakage detection unit provided on the input side of the inverter unit, and a power supply stop that stops power supply from the inverter unit to the power supply path when leakage is detected by the leakage detection unit Means.

この電力変換装置において、前記インバータ部は、入力側と出力側が電気的に絶縁されていない非絶縁型であることが好ましい。   In this power converter, the inverter unit is preferably a non-insulated type in which the input side and the output side are not electrically insulated.

この電力変換装置において、前記インバータ部の出力端を電力系統に接続するための系統連系用の端子部と、前記インバータ部の出力端と前記系統連系用端子部との接続を開閉する開閉部と、前記インバータ部の出力端に対して前記接地回路を介して前記開閉部及び前記系統連系用端子部と並列に接続された自立運転用の端子部とを備えることが好ましい。   In this power conversion device, a terminal unit for grid connection for connecting the output end of the inverter unit to the power system, and an open / close for opening and closing a connection between the output end of the inverter unit and the terminal unit for grid connection And a terminal part for independent operation connected in parallel to the switching part and the grid connection terminal part via the ground circuit with respect to the output end of the inverter part.

この電力変換装置において、前記インバータ部の入力側又は出力側に直流漏電検出器が設けられ、当該直流漏電検出器で検出される漏電電流が所定のしきい値を超えた場合に前記インバータ部から前記給電路への電力供給を停止させる電力供給停止手段とを備えることが好ましい。   In this power conversion device, a DC leakage detector is provided on the input side or output side of the inverter unit, and when the leakage current detected by the DC leakage detector exceeds a predetermined threshold, the inverter unit It is preferable to include a power supply stopping unit that stops power supply to the power supply path.

本発明の電力変換装置は、電力系統から切り離された状態でも漏電や地絡の検出が可能になるという効果がある。   The power converter of the present invention has an effect that it is possible to detect a leakage or a ground fault even in a state where the power converter is disconnected from the power system.

本発明の実施形態１を示すブロック図である。It is a block diagram which shows Embodiment 1 of this invention. 本発明の実施形態２を示すブロック図である。It is a block diagram which shows Embodiment 2 of this invention. (ａ)，(ｂ)は同上の別の構成を示すブロック図である。(a), (b) is a block diagram which shows another structure same as the above. 本発明の実施形態３を含む系統連系形の太陽光発電システムのシステム構成図である。It is a system configuration | structure figure of the grid connection type photovoltaic power generation system containing Embodiment 3 of this invention.

(実施形態１)
本実施形態の電力変換装置１は、図１に示すように発電装置２で発電される直流電力を交流電力に変換し、給電路５を介して負荷３に交流電力を供給するものである。なお、発電装置２は太陽電池や燃料電池などで構成される。 (Embodiment 1)
As shown in FIG. 1, the power conversion device 1 according to the present embodiment converts DC power generated by the power generation device 2 into AC power and supplies the AC power to the load 3 through the power supply path 5. In addition, the electric power generating apparatus 2 is comprised with a solar cell, a fuel cell, etc.

電力変換装置１は、直流電力を交流電力に変換するインバータ部10と、インバータ部10が具備する複数(図示例では２つ)の出力端のうちで電力系統から切り離されている少なくとも何れか１つの出力端を接地する接地回路とを備えている。本実施形態における接地回路は、インバータ部10の一対の出力端をそれぞれ電流制限素子11，12を介して各別に接地している。電流制限素子11，12は、例えば抵抗素子からなり、インバータ部10の出力端間に直列接続されている。そして、電流制限素子11，12の接続点がグランドに接地されている。なお、電力変換装置１の出力端子19と給電路５との間に漏電遮断器４が接続されている。   The power conversion device 1 includes at least one of an inverter unit 10 that converts DC power into AC power and a plurality (two in the illustrated example) of output terminals that the inverter unit 10 is disconnected from the power system. And a ground circuit for grounding the two output terminals. In the ground circuit in the present embodiment, the pair of output terminals of the inverter unit 10 are grounded individually via the current limiting elements 11 and 12, respectively. The current limiting elements 11 and 12 are, for example, resistance elements, and are connected in series between the output terminals of the inverter unit 10. The connection point between the current limiting elements 11 and 12 is grounded. In addition, the earth leakage circuit breaker 4 is connected between the output terminal 19 of the power converter device 1 and the feed path 5.

而して、何れかの負荷３若しくは給電路５から負荷３への給電線50で漏電等が発生すると、給電線50と給電路５と接地回路で形成される電流ループに漏洩電流又は地絡電流(以下、漏洩電流等と略す。)が流れる。このとき、接地回路を構成する電流制限素子11(又は12)によって漏洩電流等が制限されるため、感電事故などの発生を回避することができる。さらに、電流ループに流れる漏洩電流等を検出した漏電遮断器４が動作(トリップ)することにより、電流ループが遮断されて漏洩電流等が流れなくなる。   Thus, when a leakage occurs in any of the loads 3 or the power supply line 50 from the power supply path 5 to the load 3, a leakage current or a ground fault occurs in a current loop formed by the power supply line 50, the power supply path 5, and the ground circuit. Current (hereinafter abbreviated as leakage current) flows. At this time, since the leakage current or the like is limited by the current limiting element 11 (or 12) constituting the ground circuit, it is possible to avoid the occurrence of an electric shock accident or the like. Furthermore, when the leakage breaker 4 that detects the leakage current flowing in the current loop operates (trips), the current loop is interrupted and the leakage current does not flow.

上述のように本実施形態の電力変換装置１では、インバータ部10の出力端が接地回路によって接地されているので、電力系統から切り離された状態でも漏電や地絡の検出が可能になる。   As described above, in the power conversion device 1 of the present embodiment, since the output terminal of the inverter unit 10 is grounded by the ground circuit, it is possible to detect a leakage or a ground fault even when disconnected from the power system.

(実施形態２)
本実施形態の電力変換装置１は、給電路５に流れる不平衡電流を検出する電流検出器13と、電流検出器13で検出される不平衡電流が所定のしきい値を超えた場合にインバータ部10から給電路５への電力供給を停止させる電力供給停止手段とを備えている。 (Embodiment 2)
The power conversion device 1 of the present embodiment includes a current detector 13 that detects an unbalanced current flowing in the power supply path 5 and an inverter when the unbalanced current detected by the current detector 13 exceeds a predetermined threshold value. Power supply stopping means for stopping power supply from the unit 10 to the power supply path 5.

電流検出器13は零相変流器からなり、接地回路と出力端子19との間に設けられている。また電力供給停止手段は、電流検出器13と出力端子19との間に設けられた開閉部14と、漏電検出部15とで構成される。開閉部14は、例えば、インバータ部10の出力端と出力端子19との間に挿入された常閉型の電磁リレーからなる。漏電検出部15は、電流検出器13で検出される不平衡電流のレベルを所定のしきい値と比較し、不平衡電流のレベルがしきい値を超えた場合に開閉部14の電磁リレーをオフさせてインバータ部10から給電路５への電力供給を停止させる。なお、このような漏電検出部15は論理回路又はマイクロコンピュータなどで実現可能である。   The current detector 13 is a zero-phase current transformer and is provided between the ground circuit and the output terminal 19. The power supply stopping means includes an open / close unit 14 provided between the current detector 13 and the output terminal 19, and a leakage detection unit 15. The opening / closing part 14 is composed of, for example, a normally closed electromagnetic relay inserted between the output terminal of the inverter part 10 and the output terminal 19. The leakage detector 15 compares the level of the unbalanced current detected by the current detector 13 with a predetermined threshold, and when the level of the unbalanced current exceeds the threshold, the electromagnetic relay of the switching unit 14 The power supply from the inverter unit 10 to the power supply path 5 is stopped by turning off. Such a leakage detection unit 15 can be realized by a logic circuit or a microcomputer.

而して、給電線50と給電路５と接地回路で形成される電流ループに漏洩電流等が流れ、電流検出器13で検出される不平衡電流のレベルがしきい値を超えると、漏電検出部15が開閉部14を開成させるので、電流ループが遮断されて漏洩電流等が流れなくなる。   Thus, when a leakage current flows through a current loop formed by the feeder line 50, the feeder line 5, and the ground circuit, and the level of the unbalanced current detected by the current detector 13 exceeds the threshold value, the leakage detection is performed. Since the part 15 opens the opening / closing part 14, the current loop is interrupted and leakage current or the like does not flow.

上述のように本実施形態の電力変換装置１では、電流検出器13と電力供給停止手段(開閉部14及び漏電検出部15)を備えたことにより、漏電遮断器４が無くても漏電や地絡の検出及び給電路５の遮断が可能になる。   As described above, the power conversion device 1 according to the present embodiment includes the current detector 13 and the power supply stop unit (the opening / closing unit 14 and the leakage detection unit 15), so that even if the leakage breaker 4 is not present, the leakage or ground It is possible to detect a fault and interrupt the power supply path 5.

ここで、実施形態１，２ではインバータ部10の一対の出力端が双方とも電流制限素子11，12を介して接地されているが、図３(ａ)に示すように一方の出力端(図示例では上側の出力端)のみが電流制限素子11を介して接地されていても構わない。さらに、図３(ｂ)に示すようにインバータ部10の一方の出力端のみが電流制限素子11を介さずに接地されても構わない。ただし、接地回路が図３に示す構成であれば、インバータ部10の接地されていない側の出力端に接続されている方の給電路５で発生した漏電等しか検出することはできない。なお、図３とは逆にインバータ部10の他方の出力端(下側の出力端)のみが接地されても構わない。   Here, in the first and second embodiments, the pair of output terminals of the inverter unit 10 are both grounded via the current limiting elements 11 and 12, but as shown in FIG. In the example shown, only the upper output terminal) may be grounded via the current limiting element 11. Further, as shown in FIG. 3B, only one output terminal of the inverter unit 10 may be grounded without passing through the current limiting element 11. However, if the grounding circuit is configured as shown in FIG. 3, it is only possible to detect a leakage or the like that has occurred in the feeding path 5 connected to the output terminal of the inverter unit 10 that is not grounded. 3, only the other output terminal (lower output terminal) of the inverter unit 10 may be grounded.

(実施形態３)
本実施形態の電力変換装置１は、図４に示すように系統連系形の太陽光発電システムにおけるパワーコンディショナとして構成されている。ただし、本実施形態の基本構成は実施形態２と共通であるので、共通の構成要素には同一の符号を付して適宜説明を省略する。 (Embodiment 3)
The power converter 1 of this embodiment is comprised as a power conditioner in the grid connection type photovoltaic power generation system as shown in FIG. However, since the basic configuration of the present embodiment is the same as that of the second embodiment, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

本実施形態の電力変換装置１では、インバータ部10の出力端間に開閉部14と解列開閉器16が並列に接続され、開閉部14の出力側に接地回路と電流検出器13が設けられている。解列開閉器16は、インバータ部10の出力端と、系統連系用端子部18との間に設けられており、系統連系用端子部18に接続された電力系統100をインバータ部10から切り離す(解列する)ものである。つまり、電力変換装置１は、通常、電力系統100がインバータ部10の出力端と接続されて系統連系運転を行い、停電等の異常時に解列開閉器16が解列して自立運転を行う。ただし、このように系統連系運転と自立運転が切り換えられる太陽光発電システムについては従来周知であるから、詳細な構成及び動作の説明は省略する。   In the power conversion device 1 of the present embodiment, the switch 14 and the disconnect switch 16 are connected in parallel between the output terminals of the inverter unit 10, and a ground circuit and a current detector 13 are provided on the output side of the switch 14. ing. The disconnecting switch 16 is provided between the output terminal of the inverter unit 10 and the system connection terminal unit 18, and connects the power system 100 connected to the system connection terminal unit 18 from the inverter unit 10. Separate (disconnect). That is, in the power conversion apparatus 1, the power system 100 is normally connected to the output terminal of the inverter unit 10 to perform grid connection operation, and the disconnect switch 16 is disconnected to perform independent operation when an abnormality such as a power failure occurs. . However, since the photovoltaic power generation system in which the grid interconnection operation and the independent operation are switched as described above is well known in the art, a detailed description of the configuration and operation is omitted.

漏電検出部15は、電流検出器13で検出される不平衡電流のレベルを所定のしきい値と比較することで漏電等を検出する。そして、系統連系運転中に漏電等を検出した場合、漏電検出部15は、解列開閉器16を解列させるとともに開閉部14の開成させて電力系統100並びにインバータ部10から給電路５への電力供給を停止させる。また、自立運転中に漏電等を検出した場合、漏電検出部15は、開閉部14の開成させてインバータ部10から給電路５への電力供給を停止させる。   The leakage detector 15 detects a leakage or the like by comparing the level of the unbalanced current detected by the current detector 13 with a predetermined threshold value. When a leakage current or the like is detected during the grid connection operation, the leakage detection unit 15 disconnects the disconnection switch 16 and opens the switching unit 14 so that the power system 100 and the inverter unit 10 supply the power supply path 5. Stop the power supply. In addition, when leakage or the like is detected during the self-sustained operation, the leakage detection unit 15 opens the opening / closing unit 14 to stop power supply from the inverter unit 10 to the power supply path 5.

上述のように本実施形態の電力変換装置１では、系統連系形の太陽光発電システムにおけるパワーコンディショナであり、電力系統から切り離された状態(自立運転中)でも漏電や地絡の検出が可能になる。   As described above, the power conversion device 1 according to the present embodiment is a power conditioner in a grid-connected solar power generation system, and can detect a leakage or a ground fault even when disconnected from the power system (during independent operation). It becomes possible.

ここで、インバータ部10の出力端に電流検出器を設け、この電流検出器で検出される不平衡電流がしきい値を超えた場合に漏電検出部15が解列開閉器16を解列させたり、開閉部14を開成させてもよい。また、インバータ部10が入力側と出力側が絶縁されていない非絶縁型である場合、インバータ部10の入力端に電流検出器を設けても構わない。さらに、実施形態１と同様に電力変換装置１の出力端子19(自立運転用の端子部)と給電路５の間に漏電遮断器４が挿入されてもよい。   Here, a current detector is provided at the output terminal of the inverter unit 10, and when the unbalanced current detected by the current detector exceeds a threshold value, the leakage detection unit 15 disconnects the disconnect switch 16. Alternatively, the opening / closing part 14 may be opened. Further, when the inverter unit 10 is a non-insulated type in which the input side and the output side are not insulated, a current detector may be provided at the input end of the inverter unit 10. Further, as in the first embodiment, the earth leakage breaker 4 may be inserted between the output terminal 19 (terminal part for self-sustaining operation) of the power converter 1 and the power supply path 5.

あるいは、インバータ部10の入力側又は出力側の何れか一方に直流漏電検出器が設けられ、この直流漏電検出器で検出される漏電電流がしきい値を超えた場合に漏電検出部15が解列開閉器16を解列させたり、開閉部14を開成させてもよい。このようにすれば、電力変換装置１の自立運転中に漏電等が生じた場合に負荷３への電力供給を停止することができる。なお、上述のような直流漏電検出器は従来周知であるから詳細な構成の図示及び説明は省略する。   Alternatively, a DC leakage detector is provided on either the input side or the output side of the inverter unit 10, and when the leakage current detected by the DC leakage detector exceeds a threshold value, the leakage detection unit 15 is The line switch 16 may be disconnected or the opening / closing part 14 may be opened. In this way, the power supply to the load 3 can be stopped when a leakage or the like occurs during the independent operation of the power conversion device 1. In addition, since the above-mentioned DC leakage detector is well known in the art, detailed illustration and description thereof are omitted.

１ 電力変換装置
10 インバータ部
11，12 電流制限素子(接地回路) 1 Power converter
10 Inverter section
11, 12 Current limiting element (grounding circuit)

Claims (8)

直流電力を交流電力に変換するインバータ部と、当該インバータ部が具備する複数の出力端のうちで電力系統から切り離されている少なくとも何れか１つの出力端を接地する接地回路とを備えることを特徴とする電力変換装置。   An inverter unit that converts DC power into AC power, and a ground circuit that grounds at least one output terminal disconnected from the power system among a plurality of output terminals included in the inverter unit. A power converter. 前記接地回路は、電流制限素子を介して前記出力端を接地してなることを特徴とする請求項１記載の電力変換装置。   The power converter according to claim 1, wherein the ground circuit is configured to ground the output terminal via a current limiting element. 前記インバータ部は一対の出力端を具備し、前記接地回路は、当該一対の出力端をそれぞれ電流制限素子を介して各別に接地してなることを特徴とする請求項２記載の電力変換装置。   The power converter according to claim 2, wherein the inverter unit includes a pair of output terminals, and the grounding circuit grounds the pair of output terminals separately via current limiting elements. 前記インバータ部の出力側若しくは前記接地回路の出力側に設けられて給電路に流れる不平衡電流を検出する電流検出器と、当該電流検出器で検出される不平衡電流が所定のしきい値を超えた場合に前記インバータ部から前記給電路への電力供給を停止させる電力供給停止手段とを備えることを特徴とする請求項１〜３の何れか１項に記載の電力変換装置。   A current detector that is provided on the output side of the inverter unit or the output side of the ground circuit and detects an unbalanced current flowing in the power supply path, and the unbalanced current detected by the current detector has a predetermined threshold value. The power conversion device according to claim 1, further comprising: a power supply stop unit that stops power supply from the inverter unit to the power supply path when exceeding the power supply unit. 前記インバータ部の入力側に設けられた漏電検出部と、当該漏電検出部で漏電が検出された場合に前記インバータ部から前記給電路への電力供給を停止させる電力供給停止手段とを備えることを特徴とする請求項１〜４の何れか１項に記載の電力変換装置。   A leakage detection unit provided on the input side of the inverter unit, and a power supply stop unit that stops power supply from the inverter unit to the power supply path when leakage is detected by the leakage detection unit. The power converter according to any one of claims 1 to 4, wherein the power converter is characterized by the following. 前記インバータ部は、入力側と出力側が電気的に絶縁されていない非絶縁型であることを特徴とする請求項１〜５の何れか１項に記載の電力変換装置。   The power converter according to claim 1, wherein the inverter unit is a non-insulated type in which an input side and an output side are not electrically insulated. 前記インバータ部の出力端を電力系統に接続するための系統連系用の端子部と、前記インバータ部の出力端と前記系統連系用端子部との接続を開閉する開閉部と、前記インバータ部の出力端に対して前記接地回路を介して前記開閉部及び前記系統連系用端子部と並列に接続された自立運転用の端子部とを備えることを特徴とする請求項１〜６の何れか１項に記載の電力変換装置。   A grid connection terminal section for connecting an output terminal of the inverter section to a power system, an opening / closing section for opening and closing a connection between the output terminal of the inverter section and the grid connection terminal section, and the inverter section 7. A self-sustained operation terminal portion connected in parallel to the open / close portion and the grid connection terminal portion via the ground circuit with respect to the output terminal of the power supply device according to claim 1. The power converter device of Claim 1. 前記インバータ部の入力側又は出力側に直流漏電検出器が設けられ、当該直流漏電検出器で検出される漏電電流が所定のしきい値を超えた場合に前記インバータ部から前記給電路への電力供給を停止させる電力供給停止手段とを備えることを特徴とする請求項３記載の電力変換装置。   When a DC leakage detector is provided on the input side or output side of the inverter unit, and the leakage current detected by the DC leakage detector exceeds a predetermined threshold value, power from the inverter unit to the power supply path The power conversion device according to claim 3, further comprising a power supply stop unit that stops the supply.
JP2011120090A 2011-05-30 2011-05-30 Power conversion apparatus Pending JP2012249451A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000217397A (en) * 1999-01-22 2000-08-04 Honda Motor Co Ltd Generator
JP2001169561A (en) * 1999-12-02 2001-06-22 Canon Inc Power supply device, controller and its control method
JP2003087978A (en) * 2001-09-07 2003-03-20 Toshiba Corp Generating unit, panel board and power supply system using the same
CA2399747A1 (en) * 2001-09-28 2003-03-28 Himamshu V. Prasad Ballast with protection circuit for preventing inverter startup during an output ground-fault condition

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000217397A (en) * 1999-01-22 2000-08-04 Honda Motor Co Ltd Generator
JP2001169561A (en) * 1999-12-02 2001-06-22 Canon Inc Power supply device, controller and its control method
JP2003087978A (en) * 2001-09-07 2003-03-20 Toshiba Corp Generating unit, panel board and power supply system using the same
CA2399747A1 (en) * 2001-09-28 2003-03-28 Himamshu V. Prasad Ballast with protection circuit for preventing inverter startup during an output ground-fault condition

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