JP2004336856A - Uninterruptible power supply system - Google Patents

Uninterruptible power supply system Download PDF

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Publication number
JP2004336856A
JP2004336856A JP2003127666A JP2003127666A JP2004336856A JP 2004336856 A JP2004336856 A JP 2004336856A JP 2003127666 A JP2003127666 A JP 2003127666A JP 2003127666 A JP2003127666 A JP 2003127666A JP 2004336856 A JP2004336856 A JP 2004336856A
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power supply
uninterruptible power
circuit
slave
bypass
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JP2004336856A5 (en
JP4142977B2 (en
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Koji Onishi
浩司 大西
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a system which can switch the other so that it becomes a reference even if one becomes abnormal, for the purpose of solving the problem of a conventional system that it cannot be in synchronization if either a crystal-oscillator circuit becomes abnormal even though a system of switching a faulty circuit into the other oscillator circuit with a signal from the circuit of abnormality detection out of crystal oscillator circuits provided severally in each inverter, at an abnormality of a commercial oscillating circuit, is shown in a conventional system of an uninterruptible power supply system, for uniterruptible power supply systems where a plurality of inverters are operated in parallel and besides which are equipped with circuits for switching themselves instantly into a commercial AC power source for backup, increase as the request for the capacity enlargment and the reliability elevation of the uninterruptible power unit increases. <P>SOLUTION: When an abnormality occurs in either circuit of a first or a second bypass circuits provided in parallel with first and second inverter circuits, this system selects a circuit so that the reference circuit voltage of the second inverter circuit is synchronized with the reference voltage of the first inverter circuit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、複数の台数の無停電電源装置で構成された無停電電源システムに係るものであって、特に複数の無停電電源装置を同期させる同期切替え方式を備えた無停電電源システムに関するものである。
【０００２】
【従来の技術】
無停電電源装置の大容量化や高信頼性の要求が高まるにつれ、複数台のインバータを並列運転し、かつバックアップとして商用交流電源に無瞬断で切替えるための切替回路を備えた無停電電源装置が増加してきている。このような従来のシステムにおける無停電電源装置において、商用同期発振回路の異常時には、各インバータの水晶発振回路による発信器回路システムをそれぞれ設け、出力周波数異常検出回路からの信号により、一方の発振器回路システムから他方の発振器回路に切替える方式が示されている（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開昭６２−８５６３９号公報（２３４頁、第１欄、図１）
【０００４】
【発明が解決しようとする課題】
しかしながら、前記特許文献１に示された従来技術による同期電圧切替方式では、異常発生時にそれぞれ個々に設けられた水晶発振器回路に切替えるため、いずれか一方の水晶発振回路が異常となると同期がとれないという問題点がある。
この発明は、前記のような課題を解決するためになされたものであり、例えば２台の無停電電源装置を同期させるのに必要な基準電圧を、いずれか一方の基準電圧が異常となった場合、他の一方を基準電圧とすることで異常発生時の切替えのより高い信頼性を有する無停電電源システムを提供することを目的としている。
【０００５】
【課題を解決するための手段】
第１の無停電電源装置と、第２の無停電電源装置とを備えた無停電電源システムであって、前記第１の無停電電源装置には第１のインバータ回路とこれに並列の第１のバイパス回路が設けられ、前記第２の無停電電源装置には第２のインバータ回路とこれに並列の第２のバイパス回路が設けられており、通常運転時には前記第１、第２のインバータ回路は、それぞれ前記第１、第２のバイパス回路電圧を基準電圧とするよう回路が選択されており、前記第１または第２のバイパス回路に異常が発生したとき、前記第２のインバータ回路の基準電圧を前記第１のインバータ回路の基準電圧と同期するよう、前記第２の無停電電源装置に設けられたリレーによって接続を切替えるものである。
【０００６】
【発明の実施の形態】
実施の形態１．
以下、この発明の実施の形態１を図に基づいて説明する。
図１において、無停電電源システム８００は、第１の無停電電源装置１００と第２の無停電電源装置２００で構成されている。第１の無停電電源装置（以下、第１のＵＰＳと称す）１００には、第１のインバータ回路１１とこれと並列に設けられた第１のバイパス回路１２と、前記第１のインバータ回路１１の第１の駆動用ゲートドライブ回路１３と、前記第１のバイパス回路１２の電圧を検知する第１のセンサ基板１７とこれにつながる第１のメインボード１４と、このメインボード１４からの信号を受けて、前記第１のバイパス回路１２のバイパス状態を検知するリレー１５と、第１のＰＴボード１６が設けられている。また、第２の無停電電源装置（以下、第２のＵＰＳと称す）２００には、第２のインバータ回路１１ａとこれと並列に設けられた第２のバイパス回路１２ａと、前記第２のインバータ回路１１ａの第２の駆動用ゲートドライブ回路１３ａと、第２のメインボード１４ａにつながる第２のセンサ基板１７ａと、前記第２のバイパス回路１２ａに接続された第２のバイパス電圧検知トランス１８ａと、これにつながる第２の電圧センサリレー１９ａおよび第２の３接点リレー２０ａと第２のＰＴボード１６ａとが設けられている。
前記第２の３接点リレー２０ａの２つの接点は、第２のバイパス回路１２ａに接続された第２のＰＴボード１６ａと、前記第１のＵＰＳ１００の第１のＰＴボード１６に接続されており、残りの１つの接点は第２のセンサ基板１７ａに接続され第２のインバータ回路１２ａへの点弧パルスの基準位相を発する第２のメインボート１４ａを介し、第２のゲートドライブ回路１３ａを経て第２のインバータ回路１１ａの基準電圧となるよう接続されている。
【０００７】
次に主要動作を説明する。
通常運転時には前記第２の３接点リレー２０ａがＡ側を選択しているので、第２のＵＰＳ２００の第２のインバータ１１ａの基準電圧は第２のバイパス回路１２ａの電圧となっている。また第１のＵＰＳ１００の第１のインバータ１１の基準電圧も第１のバイパス回路１２の電圧となっており、第１、第２のＵＰＳ１００、２００の出力電圧は同期された電圧となっている。
前記無停電電源システム８００の運転中に、例えば第１のバイパス回路１２に異常が発生してバイパス電圧が変動した場合、そのバイパス状態を検知したリレー１５が動作し、第２のＵＰＳ２００に設けられた電圧センサリレー１９ａを介して３接点リレー２０ａがＢ側を選択することによって、第１のＵＰＳ１００に設けられた第１のＰＴ１６を経た第１のＵＰＳ１００の出力電圧が、前記第２のＵＰＳの基準電圧となる。
また通常運転時に、例えば第２のＵＰＳ２００のバイパス回路１２ａに異常が発生して電圧が変動した場合、第２の電圧センサリレー１９ａがＢ側を選択するとともに、第２の３接点リレー２０ａもＢ側を選択することによって、前記第１のインバータ回路１１の出力電圧が、前記第２のインバータ回路１１ａの基準電圧となるため、前記ＵＰＳ１００とＵＰＳ２００とは同期した電圧を維持することができる。
このように第１、第２のＵＰＳ１００、２００のいずれか一方の基準電圧が、微妙な設定誤差や外乱等により異常となった場合でも、他の一方の基準電圧に切替えることが可能となり信頼性が向上する。なお図１で第１のＵＰＳ１００をマスタ、第２のＵＰＳ２００をスレーブと記しているが、必ずしもこれに限られるものでなく、逆であってもよい。
【０００８】
実施の形態２．
実施の形態２では、並列に設けられた無停電電源装置と同期切替え装置で構成されるサブ無停電電源システムが複数備えられた無停電電源システムの電圧同期について説明する。
図２において、無停電電源システム８１０は、第１のサブ無停電電源システム８００ａと、第２の無停電電源システム８００ｂとで構成されている。前記第１のサブ無停電電源システム８００ａは、第１のマスタＵＰＳ１００ａと第１のスレーブＵＰＳ２００ａと第１のスレーブ同期切替え装置２００とを備え、同様に第２のサブ無停電電源システム８００ｂは、第２のマスタＵＰＳ１００ｂと第２のスレーブＵＰＳ２００ｂと第２のマスタ同期切替え装置３００ａを備えている。
なお、第１、第２のサブ無停電電源システム８００ａ、８００ｂの第１のマスタのＵＰＳ１００ａと第２のマスタＵＰＳ１００ｂの内部構成、および第１のスレーブＵＰＳ２００ａと第２のスレーブＵＰＳ２００ｂの内部構成は同一である。また、第２のマスタ同期切替え装置３００ａはＯＲ回路である。
【０００９】
第１のマスタＵＰＳ１００ａには、第１のインバータ回路１１と並列に設けられた第１のバイパス回路１２と、第１の駆動用ゲートドライブ回路１３と第１のメインボード１４と、第１のＰＴボード１６とこれにつながり基準電圧を切替える第１の３接点リレー２０と第１のバイパス電圧を検知トランス１８と電圧リレー１９と第１の切替え判定回路２１が設けられている。
第１のスレーブＵＰＳ２００ａには、第２のインバータ回路１１ａと並列に設けられた第２のバイパス回路１２ａと、駆動用ゲートドライブ回路１３ａと、第２のメインボード１４ａにつながる第２のセンサ基板１７ａと、第２のバイパス電圧検知トランス１８ａと第２の電圧リレー１９ａおよび第２の切替え判定回路２１ａと、第２の３接点リレー２０ａおよび第３の３接点リレー２０ｂとこの第３の３接点リレー２０ｂにつながる接点２２が設けられている。
【００１０】
第１のスレーブ同期切替え装置３００は、前記第１のスレーブＵＰＳ２００ａの基準電圧切替え回路２３と、第１のマスタＵＰＳ１００ａの基準電圧切替え回路２７と、第１、第２のリレー２４、２５とインタロック回路２６、第１のマスタＵＰＳ１００ａ用基準電圧切替えリレー２８および第１のスレーブＵＰＳ２００ａ用基準電圧切替えリレー２８ａを有し、前記インタロック回路２６は、第１のスレーブＵＰＳ２００ａの出力電圧３０と第２のマスタ同期切替え装置３００ａの出力電圧３１を入力している。また前記第１のマスタＵＰＳ１００ａ用基準電圧切替え回路２７は第１のマスタＵＰＳ１００ａの出力電圧２９と第２のマスタ同期切替え装置３００ａの出力電圧３１を入力している。なお、第２のマスタＵＰＳ１００ｂには第３のインバータ回路１１ｂと第３のバイパス回路１２ｂ、第２のスレーブＵＰＳ２００ｂには第４のインバータ回路１１ｃと第４のバイパス回路１２ｃとが設けられている。その他の構成機器の説明は省略する。
【００１１】
次に動作について述べる。通常運転時は、前記実施の形態１で説明した動作と同様であるので省略する。
この無停電電源システム８１０は、前記第１のマスタＵＰＳ１００ａ、第１のスレーブＵＰＳ２００ａの基準電圧が何らかの原因によって異常となった場合、誤認の発生をなくする構成を有している。すなわち、第１のスレーブ同期切替え装置３００内の第１のスレーブＵＰＳ２００ａ用基準電圧切替え回路２３のインタロック回路２６により、前記第１のスレーブＵＰＳ２００ａへの基準電圧を、前記第１のスレーブＵＰＳ２００ａの出力電圧３０と前記第２のサブ無停電電源システム８００ｂに設けられた第２のマスタ同期切替え装置３００ａからの出力電圧３１とを同時に選択することなく、いずれか一方を選択できる構成としているので、第１のスレーブＵＰＳ２００ａへの基準電圧の誤認はない。また、第１のマスタＵＰＳ１００ａの基準電圧も前記第１のマスタＵＰＳ１００ａの基準電圧切替え回路２７により、前記第１のマスタＵＰＳ１００ａの出力電圧２９と第２のマスタ同期切替え装置３００ａからの出力電圧３１を同時に選択することなく、いずれか一方を選択でき、第１のマスタＵＰＳ１００ａへの基準電圧の誤認による不具合を無くすことができる。
なお、前記図２に示した実施の形態２では、第２のサブ無停電電源システム８００ｂを１式設ける例を示したが、これに限らず複数のサブ無停電電源システムを設けたものであってもよい。
【００１２】
実施の形態３．
実施の形態３を図３に基づいて説明する。
この実施の形態３の無停電電源システム８１０ａを構成する第１のサブ無停電電源システム８００ｃおよび第２のサブ無停電電源システム８００ｄ内の主要構成機器は、前述した実施の形態２と以下の点を除いて同じである。すなわち図３に示すように、第１のサブ無停電電源システム８００ｃを構成する第１のスレーブ同期切替え装置３００ｂには、第１の信号一括回路３２と、第２の信号一括回路３３とが設けられている。前記第１の信号一括回路３２は、第１のマスタＵＰＳ１００ａ内の第１の３接点リレー２０の出力と、第１のスレーブ同期切替え装置３００ｂ内の第１のマスタＵＰＳの基準電圧切替え回路２７の出力とを接続するものである。
また、前記第２の信号一括回路３３は、第１のスレーブＵＰＳ２００ａ内の第２の３接点リレー２０ａおよび第３の３接点リレー２０ｂの出力と、第１のスレーブ同期切替え装置３００ｂ内の第１、第２のリレー２４、２５の出力を接続するものである。このような実施の形態３の無停電電源システム８１０ａでは、前記実施の形態２の効果に加え、第１のスレーブＵＰＳ２００ａへの同期電圧送信回路を簡素化でき、かつ第１のマスタＵＰＳ１００ａと第１のスレーブＵＰＳ２００ａの同期電圧送信回路が同一の構成となり、標準化がはかれるという効果もある。
【００１３】
実施の形態４．
実施の形態４を図４に基づいて説明する。
この実施の形態４の無停電電源システム８１０ｂを構成する第１のサブ無停電電源システム８００ｅおよび第２のサブ無停電電源システム８００ｆ内の主要構成機器は、前述した実施の形態２と以下の点を除いて同じである。
すなわち図４に示すように、第１のサブ無停電電源システム８００ｅを構成する第１のスレーブ同期切替え装置３００ｃには、バイパス電圧受信回路３４が設けられている。前記バイパス電圧受信回路３４の出力は第１のマスタＵＰＳ１００ａ内の第１の切替え判定回路２１と、第１のスレーブＵＰＳ２００ａ内の第２の切替え判定回路２１ａに接続されており、さらに第２のサブ無停電電源システム８００ｆの第２のマスタ同期切替え装置３００ｄ内に設けられたバイパス電圧異常受信回路３５の出力を入力している。なお、前記バイパス電圧異常受信回路３５は、第２のマスタＵＰＳ１００ｂと第２のスレーブＵＰＳ２００ｂのバイパス電圧異常状態を入力するものである。このように、バイパス電圧異常受信回路３５とバイパス電圧受信回路３４を設けているので、第２のサブ無停電電源システム８００ｆ内の第３または第４のバイパス電圧異常発生を第１のマスタＵＰＳ１００ａと第１のスレーブＵＰＳ２００ａに同時に送信することができ、第１のマスタＵＰＳ１００ａと第１のスレーブＵＰＳ２００ａの切替え条件が不一致となることがない。
また、バイパス電圧受信回路３４が動作した場合、第１のマスタＵＰＳ１００ａ内の第１の３接点リレー２０と第１のスレーブ２００ａ内の第２の３接点リレー２０ａの回路は、接点Ｂ側を選択し、第１のスレーブ同期切替え装置３００ｃからの基準電圧を有効とし、かつ第１のマスタＵＰＳ１００ａと第１のスレーブＵＰＳ２００ａの基準電圧は、第１のスレーブ同期切替え装置３００ｃからの電圧に選択できるという効果がある。
【００１４】
実施の形態５．
実施の形態５を図５に基づいて説明する。
この実施の形態５の無停電電源システム８１０ｃを構成する第１のサブ無停電電源システム８００ｇおよび第２のサブ無停電電源システム８００ｆ内の主要構成機器は、前述した実施の形態４と以下の点を除いて同じである。
すなわち図５に示すように、第１のスレーブ同期切替え装置３００ｅには、基準電圧切替え信号受信リレー回路３６が設けられている。前記リレー回路３６は、第１のマスタＵＰＳ１００ａ、第１のスレーブＵＰＳ２００ａの第１、第２の切替え判定回路２１、２１ａおよび第１のマスタＵＰＳ１００ａ、第２のスレーブＵＰＳ２００ａの基準電圧切替えリレー２８、２８ａに接続されている。
このように基準電圧切替え信号受信リレー回路３６を設けているので、第１の切替え判定回路２１と第２の切替え判定回路２１ａの判定回路のいずれか一方が有効となれば、第１のマスタＵＰＳ１００ａ用基準電圧切替えリレー２８と、第１のスレーブＵＰＳ２００ａ用基準電圧切替えリレー２８ａが同時にＢ側を選択し、第１のマスタＵＰＳ１００ａと第１のスレーブＵＰＳ２００ａが基準電圧がともに同一の第２のサブ無停電電源システム８００ｆの出力電圧３１を選択することが可能となり、基準電圧が不一致となることがなくなり、一層信頼性の向上した同期切替え方法を備えた無停電電源システムとなる。
【００１５】
実施の形態６．
実施の形態６を図６に基づいて説明する。
この実施の形態６の無停電電源システム８１０ｄを構成する第１のサブ無停電電源システム８００ｈおよび第２のサブ無停電電源システム８００ｉ内の主要構成機器は、前述した実施の形態５と以下の点を除いて同じである。
すなわち図６に示すように、第１のスレーブ同期切替え装置３００ｆには、スレーブ選択判定回路３７が設けられている。前記スレーブ選択判定回路３７は、第１のマスタＵＰＳ１００ａ、第１のスレーブＵＰＳ２００ａの第１、第２の切替え判定回路２１、２１ａおよび基準電圧切替え受信リレー回路３６に接続され、第１のスレーブ同期切替え装置３００ｆがスレーブ選択で有効となる信号３８、または第２のマスタ同期切替え装置３００ｇがスレーブ選択で有効となる信号３９を出力する。
このようにスレーブ選択判定回路３７を設け、それを手動または自動によって操作することによって、第１のスレーブ同期切替え装置３００ｆと第２のマスタ同期切替え装置３００ｇとの機能を任意に交代させることが可能となり、第１、第２のバイパス回路１２、１２ａに異常が発生したときには、第１、第２のバイパス回路１２、１２ａの基準電圧を第３、第４のインバータ回路１１ｂ、１１ｃの基準電圧と同期するように、または第３、４のバイパス回路１２ｂ、１２ｃに異常が生じたときには、第３、第４のバイパス回路１２ｂ、１２ｃの基準電圧を第１、第２のインバータ回路１１、１１ａの基準電圧と同期するよう柔軟な無停電電源システムの運用ができるとともに、サブ無停電電源システムの回路の標準化が可能となる。
【００１６】
【発明の効果】
この発明は、以上述べたような構成の無停電電源システムであるので、以下のような効果がある。
すなわち、第１の無停電電源装置と、第２の無停電電源装置とを備え、第１の無停電電源装置には第１のインバータ回路とこれに並列の第１のバイパス回路が設けられ、第２の無停電電源装置には第２のインバータ回路とこれに並列の第２のバイパス回路が設けられており、通常運転時には第１、第２のインバータ回路は、それぞれ第１、第２のバイパス回路電圧を基準電圧とするよう回路が選択されており、第１または第２のバイパス回路に異常が発生したとき、第２のインバータ回路の基準電圧を第１のインバータ回路の基準電圧と同期するよう、第２の無停電電源装置に設けられたリレーによって回路が選択される構成の無停電電源システムであるので、第１、第２の無停電電源装置のいずれか一方の基準電圧が異常となっても、他の一方の基準電圧に切替えることができ、より信頼性の高い無停電電源システムとなるという優れた効果を奏する。
【図面の簡単な説明】
【図１】この発明の実施の形態１による無停電電源システムを示す回路図である。
【図２】この発明の実施の形態２による無停電電源システムを示す回路図である。
【図３】この発明の実施の形態３による無停電電源システムを示す回路図である。
【図４】この発明の実施の形態４による無停電電源システムを示す回路図である。
【図５】この発明の実施の形態５による無停電電源システムを示す回路図である。
【図６】この発明の実施の形態６による無停電電源システムを示す回路図である。
【符号の説明】
１１ 第１のインバータ回路、１１ａ 第２のインバータ回路、
１１ｂ 第３のインバータ回路、１１ｃ 第４のインバータ回路、
１２ 第１のバイパス回路、１２ａ 第２のバイパス回路、
１２ｂ 第３のバイパス回路、１２ｃ 第４のバイパス回路、
１３ バイパス状態検知リレー、１９，１９ａ 電圧センサリレー、
２０ａ 第２の３接点リレー、１００ 第１のＵＰＳ、
１００ａ 第１のマスタＵＰＳ、１００ｂ 第２のマスタＵＰＳ、
２００ 第２のＵＰＳ、２００ａ 第１のスレーブＵＰＳ、
２００ｂ 第２のスレーブＵＰＳ、
３００，３００ｂ，３００ｃ，３００ｅ，３００ｆ 第１のスレーブ同期切替え装置、
３００ａ，３００ｄ，３００ｇ 第２のマスタ同期切替え装置、
８００，８１０，８１０ａ，８１０ｂ，８１０ｃ，８１０ｄ 無停電電源システム、
８００ａ，８００ｃ，８００ｅ，８００ｈ 第１のサブ無停電電源システム、
８００ｂ，８００ｄ，８００ｆ，８００ｉ 第２のサブ無停電電源システム。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an uninterruptible power supply system including a plurality of uninterruptible power supplies, and more particularly to an uninterruptible power supply system having a synchronous switching method for synchronizing a plurality of uninterruptible power supplies. is there.
[0002]
[Prior art]
With the demand for higher capacity and higher reliability of uninterruptible power supplies, uninterruptible power supplies equipped with a switching circuit for operating multiple inverters in parallel and switching to a commercial AC power supply without interruption as a backup Is increasing. In such an uninterruptible power supply in a conventional system, when a commercial synchronous oscillation circuit is abnormal, a transmitter circuit system is provided by a crystal oscillation circuit of each inverter, and one of the oscillator circuits is provided by a signal from an output frequency abnormality detection circuit. A method of switching from the system to the other oscillator circuit is disclosed (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-62-85639 (page 234, column 1, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in the synchronous voltage switching method according to the related art disclosed in Patent Document 1, when an abnormality occurs, switching is performed to the individually provided crystal oscillator circuits, so that if one of the crystal oscillation circuits becomes abnormal, synchronization is not achieved. There is a problem.
The present invention has been made in order to solve the above-described problem. For example, a reference voltage required to synchronize two uninterruptible power supplies has become abnormal. In this case, an object of the present invention is to provide an uninterruptible power supply system having higher reliability of switching when an abnormality occurs by using the other as a reference voltage.
[0005]
[Means for Solving the Problems]
An uninterruptible power supply system including a first uninterruptible power supply and a second uninterruptible power supply, wherein the first uninterruptible power supply has a first inverter circuit and a first inverter circuit parallel to the first inverter circuit. The second uninterruptible power supply device is provided with a second inverter circuit and a second bypass circuit in parallel with the second inverter circuit. During normal operation, the first and second inverter circuits are provided. Are respectively selected such that the first and second bypass circuit voltages are used as reference voltages, and when an abnormality occurs in the first or second bypass circuit, the reference voltage of the second inverter circuit is determined. The connection is switched by a relay provided in the second uninterruptible power supply so that the voltage is synchronized with the reference voltage of the first inverter circuit.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, an uninterruptible power supply system 800 includes a first uninterruptible power supply 100 and a second uninterruptible power supply 200. A first uninterruptible power supply (hereinafter, referred to as a first UPS) 100 includes a first inverter circuit 11, a first bypass circuit 12 provided in parallel with the first inverter circuit 11, and a first inverter circuit 11. A first driving gate drive circuit 13, a first sensor board 17 for detecting the voltage of the first bypass circuit 12, a first main board 14 connected thereto, and a signal from the main board 14. In addition, a relay 15 for detecting a bypass state of the first bypass circuit 12 and a first PT board 16 are provided. A second uninterruptible power supply (hereinafter, referred to as a second UPS) 200 includes a second inverter circuit 11a, a second bypass circuit 12a provided in parallel with the second inverter circuit 11a, and a second inverter circuit 11a. A second driving gate drive circuit 13a of the circuit 11a, a second sensor substrate 17a connected to the second main board 14a, and a second bypass voltage detecting transformer 18a connected to the second bypass circuit 12a. , A second voltage sensor relay 19a, a second three-contact relay 20a, and a second PT board 16a are provided.
Two contacts of the second three-contact relay 20a are connected to a second PT board 16a connected to a second bypass circuit 12a and a first PT board 16 of the first UPS 100, The other one of the contacts is connected to the second sensor board 17a, passes through the second main boat 14a that emits the reference phase of the ignition pulse to the second inverter circuit 12a, and passes through the second gate drive circuit 13a. The second inverter circuit 11a is connected to be a reference voltage.
[0007]
Next, the main operation will be described.
During normal operation, the second three-contact relay 20a selects the side A, so that the reference voltage of the second inverter 11a of the second UPS 200 is the voltage of the second bypass circuit 12a. The reference voltage of the first inverter 11 of the first UPS 100 is also the voltage of the first bypass circuit 12, and the output voltages of the first and second UPSs 100 and 200 are synchronized voltages.
During the operation of the uninterruptible power supply system 800, for example, when an abnormality occurs in the first bypass circuit 12 and the bypass voltage fluctuates, the relay 15 that detects the bypass state operates and is provided in the second UPS 200. When the three-contact relay 20a selects the side B via the voltage sensor relay 19a, the output voltage of the first UPS 100 via the first PT 16 provided in the first UPS 100 is changed to the output voltage of the second UPS. It becomes the reference voltage.
Further, during normal operation, for example, when an abnormality occurs in the bypass circuit 12a of the second UPS 200 and the voltage fluctuates, the second voltage sensor relay 19a selects the B side, and the second three-contact relay 20a also switches the B side. By selecting the side, the output voltage of the first inverter circuit 11 becomes the reference voltage of the second inverter circuit 11a, so that the UPS 100 and the UPS 200 can maintain a synchronized voltage.
As described above, even if the reference voltage of one of the first and second UPSs 100 and 200 becomes abnormal due to a delicate setting error or disturbance, it is possible to switch to the other one of the reference voltages. Is improved. Although FIG. 1 illustrates the first UPS 100 as a master and the second UPS 200 as a slave, the present invention is not necessarily limited to this, and may be reversed.
[0008]
Embodiment 2 FIG.
In the second embodiment, voltage synchronization of an uninterruptible power supply system provided with a plurality of sub uninterruptible power supply systems each including an uninterruptible power supply provided in parallel and a synchronization switching device will be described.
2, the uninterruptible power supply system 810 includes a first sub uninterruptible power supply system 800a and a second uninterruptible power supply system 800b. The first sub uninterruptible power supply system 800a includes a first master UPS 100a, a first slave UPS 200a, and a first slave synchronization switching device 200. Similarly, the second sub uninterruptible power supply system 800b includes A second master UPS 100b, a second slave UPS 200b, and a second master synchronization switching device 300a.
Note that the internal configurations of the first master UPS 100a and the second master UPS 100b of the first and second sub uninterruptible power supply systems 800a and 800b, and the internal configurations of the first slave UPS 200a and the second slave UPS 200b are the same. It is. The second master synchronization switching device 300a is an OR circuit.
[0009]
The first master UPS 100a includes a first bypass circuit 12 provided in parallel with the first inverter circuit 11, a first driving gate drive circuit 13, a first main board 14, and a first PT. A board 16, a first three-contact relay 20 connected thereto and switching a reference voltage, a first bypass voltage detecting transformer 18, a voltage relay 19, and a first switching determination circuit 21 are provided.
The first slave UPS 200a includes a second bypass circuit 12a provided in parallel with the second inverter circuit 11a, a driving gate drive circuit 13a, and a second sensor board 17a connected to the second main board 14a. A second bypass voltage detecting transformer 18a, a second voltage relay 19a, a second switching determination circuit 21a, a second three-contact relay 20a, a third three-contact relay 20b, and the third three-contact relay. A contact 22 leading to 20b is provided.
[0010]
The first slave synchronous switching device 300 interlocks with the reference voltage switching circuit 23 of the first slave UPS 200a, the reference voltage switching circuit 27 of the first master UPS 100a, and the first and second relays 24 and 25. Circuit 26, a reference voltage switching relay 28 for the first master UPS 100a, and a reference voltage switching relay 28a for the first slave UPS 200a, and the interlock circuit 26 includes the output voltage 30 of the first slave UPS 200a and the second The output voltage 31 of the master synchronization switching device 300a is input. The reference voltage switching circuit 27 for the first master UPS 100a receives the output voltage 29 of the first master UPS 100a and the output voltage 31 of the second master synchronous switching device 300a. The second master UPS 100b is provided with a third inverter circuit 11b and a third bypass circuit 12b, and the second slave UPS 200b is provided with a fourth inverter circuit 11c and a fourth bypass circuit 12c. The description of the other components is omitted.
[0011]
Next, the operation will be described. At the time of the normal operation, the operation is the same as that described in the first embodiment, and a description thereof will be omitted.
The uninterruptible power supply system 810 has a configuration that eliminates the occurrence of erroneous recognition when the reference voltage of the first master UPS 100a and the first slave UPS 200a becomes abnormal for some reason. That is, the reference voltage to the first slave UPS 200a is output by the interlock circuit 26 of the first slave UPS 200a reference voltage switching circuit 23 in the first slave synchronous switching device 300 to the output of the first slave UPS 200a. Since the voltage 30 and the output voltage 31 from the second master synchronization switching device 300a provided in the second sub-uninterruptible power supply system 800b are not selected at the same time, either one can be selected. There is no erroneous recognition of the reference voltage for one slave UPS 200a. The reference voltage of the first master UPS 100a is also changed by the reference voltage switching circuit 27 of the first master UPS 100a to the output voltage 29 of the first master UPS 100a and the output voltage 31 of the second master synchronous switching device 300a. Either one can be selected without selecting them at the same time, and the problem caused by erroneous recognition of the reference voltage to the first master UPS 100a can be eliminated.
Although the second embodiment shown in FIG. 2 shows an example in which one set of the second sub uninterruptible power supply system 800b is provided, the present invention is not limited to this, and a plurality of sub uninterruptible power supply systems are provided. You may.
[0012]
Embodiment 3 FIG.
Embodiment 3 will be described with reference to FIG.
The main components in the first sub-uninterruptible power supply system 800c and the second sub-uninterruptible power supply system 800d that constitute the uninterruptible power supply system 810a according to the third embodiment are the same as those in the second embodiment described above. Is the same except for That is, as shown in FIG. 3, the first sub-uninterruptible power supply system 800c includes the first signal batch circuit 32 and the second signal batch circuit 33 in the first slave synchronization switching device 300b. Have been. The first signal batch circuit 32 is connected to the output of the first three-contact relay 20 in the first master UPS 100a and the reference voltage switching circuit 27 of the first master UPS in the first slave synchronous switching device 300b. It connects the output.
In addition, the second signal batch circuit 33 is connected to the outputs of the second three-contact relay 20a and the third three-contact relay 20b in the first slave UPS 200a and the first signal in the first slave synchronization switching device 300b. , And the outputs of the second relays 24 and 25 are connected. In the uninterruptible power supply system 810a according to the third embodiment, in addition to the effects of the second embodiment, the synchronization voltage transmission circuit to the first slave UPS 200a can be simplified, and the first master UPS 100a and the first Has the same configuration as the synchronous voltage transmission circuit of the slave UPS 200a, and has an effect that standardization can be achieved.
[0013]
Embodiment 4 FIG.
Embodiment 4 will be described with reference to FIG.
The main components in the first sub uninterruptible power supply system 800e and the second sub uninterruptible power supply system 800f that constitute the uninterruptible power supply system 810b of the fourth embodiment are the same as those of the second embodiment described below. Is the same except for
That is, as shown in FIG. 4, the first slave synchronous switching device 300c included in the first sub uninterruptible power supply system 800e is provided with the bypass voltage receiving circuit 34. The output of the bypass voltage receiving circuit 34 is connected to a first switching determination circuit 21 in the first master UPS 100a and a second switching determination circuit 21a in the first slave UPS 200a. The output of the bypass voltage abnormality receiving circuit 35 provided in the second master synchronous switching device 300d of the uninterruptible power supply system 800f is input. The bypass voltage abnormality receiving circuit 35 inputs an abnormal bypass voltage state of the second master UPS 100b and the second slave UPS 200b. As described above, since the bypass voltage abnormality receiving circuit 35 and the bypass voltage receiving circuit 34 are provided, the occurrence of the third or fourth bypass voltage abnormality in the second sub uninterruptible power supply system 800f is determined by the first master UPS 100a. Data can be transmitted to the first slave UPS 200a at the same time, and the switching conditions of the first master UPS 100a and the first slave UPS 200a do not become inconsistent.
When the bypass voltage receiving circuit 34 operates, the circuit of the first three-contact relay 20 in the first master UPS 100a and the second three-contact relay 20a in the first slave 200a selects the contact B side. Then, the reference voltage from the first slave synchronization switching device 300c is made valid, and the reference voltages of the first master UPS 100a and the first slave UPS 200a can be selected as the voltage from the first slave synchronization switching device 300c. effective.
[0014]
Embodiment 5 FIG.
Embodiment 5 will be described with reference to FIG.
The main components in the first sub-uninterruptible power supply system 800g and the second sub-uninterruptible power supply system 800f that constitute the uninterruptible power supply system 810c of the fifth embodiment are the same as those of the above-described fourth embodiment. Is the same except for
That is, as shown in FIG. 5, the first slave synchronization switching device 300e is provided with a reference voltage switching signal reception relay circuit 36. The relay circuit 36 includes first and second switching determination circuits 21 and 21a of the first master UPS 100a and the first slave UPS 200a and reference voltage switching relays 28 and 28a of the first master UPS 100a and the second slave UPS 200a. It is connected to the.
Since the reference voltage switching signal receiving relay circuit 36 is provided in this manner, if either one of the first switching determination circuit 21 and the determination circuit of the second switching determination circuit 21a becomes valid, the first master UPS 100a The reference voltage switching relay 28 and the reference voltage switching relay 28a for the first slave UPS 200a simultaneously select the B side, and the first master UPS 100a and the first slave UPS 200a have the same second reference voltage. The output voltage 31 of the power failure power supply system 800f can be selected, the reference voltage does not become inconsistent, and an uninterruptible power supply system having a more reliable synchronous switching method is provided.
[0015]
Embodiment 6 FIG.
Embodiment 6 will be described with reference to FIG.
The main components in the first sub-uninterruptible power supply system 800h and the second sub-uninterruptible power supply system 800i that constitute the uninterruptible power supply system 810d according to the sixth embodiment are the same as those of the fifth embodiment described below. Is the same except for
That is, as shown in FIG. 6, the first slave synchronization switching device 300f is provided with a slave selection determining circuit 37. The slave selection determination circuit 37 is connected to the first master UPS 100a, the first and second switching determination circuits 21 and 21a of the first slave UPS 200a, and the reference voltage switching reception relay circuit 36, and performs first slave synchronous switching. The device 300f outputs a signal 38 that is enabled by slave selection, or the second master synchronization switching device 300g outputs a signal 39 that is enabled by slave selection.
By thus providing the slave selection determination circuit 37 and operating it manually or automatically, the functions of the first slave synchronization switching device 300f and the second master synchronization switching device 300g can be arbitrarily changed. When an abnormality occurs in the first and second bypass circuits 12, 12a, the reference voltage of the first and second bypass circuits 12, 12a is changed to the reference voltage of the third and fourth inverter circuits 11b, 11c. In order to synchronize or when an abnormality occurs in the third and fourth bypass circuits 12b and 12c, the reference voltages of the third and fourth bypass circuits 12b and 12c are changed to those of the first and second inverter circuits 11 and 11a. A flexible uninterruptible power supply system can be operated so as to be synchronized with the reference voltage, and the circuit of the sub uninterruptible power supply system can be standardized.
[0016]
【The invention's effect】
Since the present invention is the uninterruptible power supply system having the configuration described above, the following effects are provided.
That is, a first uninterruptible power supply and a second uninterruptible power supply are provided, and the first uninterruptible power supply is provided with a first inverter circuit and a first bypass circuit parallel to the first inverter circuit. The second uninterruptible power supply is provided with a second inverter circuit and a second bypass circuit in parallel with the second inverter circuit. During normal operation, the first and second inverter circuits are respectively connected to the first and second inverter circuits. A circuit is selected to use the bypass circuit voltage as a reference voltage, and when an abnormality occurs in the first or second bypass circuit, the reference voltage of the second inverter circuit is synchronized with the reference voltage of the first inverter circuit. Since the uninterruptible power supply system has a configuration in which a circuit is selected by a relay provided in the second uninterruptible power supply, the reference voltage of one of the first and second uninterruptible power supplies is abnormal. Even if other It can be switched to the reference voltage of the square, an excellent effect that a more reliable uninterruptible power supply system.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an uninterruptible power supply system according to Embodiment 1 of the present invention.
FIG. 2 is a circuit diagram showing an uninterruptible power supply system according to Embodiment 2 of the present invention.
FIG. 3 is a circuit diagram showing an uninterruptible power supply system according to Embodiment 3 of the present invention.
FIG. 4 is a circuit diagram showing an uninterruptible power supply system according to Embodiment 4 of the present invention.
FIG. 5 is a circuit diagram showing an uninterruptible power supply system according to Embodiment 5 of the present invention.
FIG. 6 is a circuit diagram showing an uninterruptible power supply system according to Embodiment 6 of the present invention.
[Explanation of symbols]
11 first inverter circuit, 11a second inverter circuit,
11b third inverter circuit, 11c fourth inverter circuit,
12 first bypass circuit, 12a second bypass circuit,
12b third bypass circuit, 12c fourth bypass circuit,
13 bypass state detection relay, 19, 19a voltage sensor relay,
20a second three-contact relay, 100 first UPS,
100a first master UPS, 100b second master UPS,
200 second UPS, 200a first slave UPS,
200b second slave UPS,
300, 300b, 300c, 300e, 300f first slave synchronization switching device,
300a, 300d, 300g second master synchronization switching device,
800, 810, 810a, 810b, 810c, 810d uninterruptible power supply system,
800a, 800c, 800e, 800h first sub uninterruptible power supply system,
800b, 800d, 800f, 800i A second sub uninterruptible power supply system.

Claims (5)

第１の無停電電源装置と、第２の無停電電源装置とを備えた無停電電源システムであって、前記第１の無停電電源装置には第１のインバータ回路とこれに並列の第１のバイパス回路が設けられ、前記第２の無停電電源装置には第２のインバータ回路とこれに並列の第２のバイパス回路が設けられており、通常運転時には前記第１、第２のインバータ回路は、それぞれ前記第１、第２のバイパス回路電圧を基準電圧とするよう回路が選択されており、前記第１または第２のバイパス回路に異常が発生したとき、前記第２のインバータ回路の基準電圧を前記第１のインバータ回路の基準電圧と同期するよう、前記第２の無停電電源装置に設けられたリレーによって回路が選択されることを特徴とする無停電電源システム。An uninterruptible power supply system including a first uninterruptible power supply and a second uninterruptible power supply, wherein the first uninterruptible power supply has a first inverter circuit and a first inverter circuit parallel to the first inverter circuit. The second uninterruptible power supply device is provided with a second inverter circuit and a second bypass circuit in parallel with the second inverter circuit. During normal operation, the first and second inverter circuits are provided. Are respectively selected such that the first and second bypass circuit voltages are used as reference voltages, and when an abnormality occurs in the first or second bypass circuit, the reference voltage of the second inverter circuit is determined. An uninterruptible power supply system, wherein a circuit is selected by a relay provided in the second uninterruptible power supply so as to synchronize a voltage with a reference voltage of the first inverter circuit. 第１の無停電電源装置と、第２の無停電電源装置とを備えた無停電電源システムであって、前記第１の無停電電源装置に設けられた第１のインバータ回路と並列の第１のバイパス回路の発する第１のバイパス電圧出力信号とバイパス状態検知リレーの信号とが前記第２の無停電電源装置に出力されており、前記第２の無停電電源装置に設けられた第２のインバータ回路と並列の第２のバイパス回路の発する第２のバイパス電圧出力信号が電圧センサリレーに出力されるとともに、前記電圧センサリレーは３接点リレーおよび前記第１の無停電電源装置に設けられた前記バイパス状態検知リレーに接続されており、前記３接点リレーは前記第１、第２のバイパス電圧と、前記第２の無停電電源装置の第２のインバータ回路の点弧パルス基準位相を発するメインボードにつながっており、前記第１の無停電電源装置の前記第１のバイパス回路が異常となったとき、前記バイパス状態検知リレー、電圧センサリレーを介して、あるいは前記第２の無停電電源装置の第２のバイパス回路が異常となったとき、前記電圧センサリレーを介して、前記第２のインバータ回路の基準電圧を前記第１のインバータ回路の基準電圧と同期するよう、前記３接点リレーによって回路が選択されることを特徴とする無停電電源システム。An uninterruptible power supply system comprising a first uninterruptible power supply and a second uninterruptible power supply, wherein a first uninterruptible power supply is provided in parallel with a first inverter circuit provided in the first uninterruptible power supply. A first bypass voltage output signal and a bypass state detection relay signal generated by the bypass circuit are output to the second uninterruptible power supply, and the second bypass uninterruptible power supply provided in the second uninterruptible power supply is provided. A second bypass voltage output signal generated by a second bypass circuit in parallel with the inverter circuit is output to a voltage sensor relay, and the voltage sensor relay is provided in the three-contact relay and the first uninterruptible power supply. The three-contact relay is connected to the first and second bypass voltages and a firing pulse reference phase of a second inverter circuit of the second uninterruptible power supply. The first uninterruptible power supply unit, when the first bypass circuit of the first uninterruptible power supply becomes abnormal, via the bypass state detection relay, the voltage sensor relay, or the second uninterruptible power supply When the second bypass circuit of the power supply device becomes abnormal, the three contacts are connected via the voltage sensor relay so that the reference voltage of the second inverter circuit is synchronized with the reference voltage of the first inverter circuit. An uninterruptible power supply system, wherein a circuit is selected by a relay. 第１のサブ無停電電源システムと第２のサブ無停電電源システムとを具備した無停電電源システムであって、前記第１のサブ無停電電源システムには並列に設けられた第１のマスタ無停電電源装置と第１のスレーブ無停電電源装置とにつながる第１のスレーブ同期切替え装置とが備えられており、前記第２のサブ無停電電源システムには並列に設けられた第２のマスタ無停電電源装置と第２のスレーブ無停電電源装置とにつながる第２のマスタ同期切替え装置とが備えられており、前記第１のマスタ無停電電源装置には、第１のインバータ回路とこれに並列に第１のバイパス回路とが設けられており、前記第１のスレーブ無停電電源装置には、第２のインバータ回路とこれに並列の第２のバイパス回路とが設けられており、前記無停電電源システムの通常運転時には前記第１、第２のインバータ回路は、それぞれ前記第１、第２のバイパス回路の電圧が基準電圧となるよう前記第１のマスタおよび第１のスレーブ無停電電源装置内に設けられた回路が選択されており、前記第１または第２のバイパス回路のいずれかに異常が発生したとき、前記第１、第２のインバータ回路の基準電圧を前記第２のサブ無停電電源システムの前記第２のマスタ同期切替え装置の出力する電圧と同期するよう、前記第１のサブ無停電電源システムの前記第１のスレーブ同期切替え装置内に設けられた回路が選択されることを特徴とする無停電電源システム。An uninterruptible power supply system comprising a first sub uninterruptible power supply system and a second sub uninterruptible power supply system, wherein the first sub uninterruptible power supply system has a first master uninterruptible power supply provided in parallel. A second slave uninterruptible power supply system connected to the second sub uninterruptible power supply system and a first slave synchronous switching device connected to the uninterruptible power supply and the first slave uninterruptible power supply; A second master synchronization switching device that is connected to the power failure power supply device and the second slave uninterruptible power supply device, wherein the first master uninterruptible power supply device has a first inverter circuit and a parallel connection therewith. A first bypass circuit, and the first slave uninterruptible power supply is provided with a second inverter circuit and a second bypass circuit in parallel with the second inverter circuit. Power supply During normal operation of the system, the first and second inverter circuits are installed in the first master and the first slave uninterruptible power supply such that the voltages of the first and second bypass circuits become reference voltages, respectively. The circuit provided is selected, and when an abnormality occurs in one of the first and second bypass circuits, the reference voltage of the first and second inverter circuits is changed to the second sub uninterruptible power supply. A circuit provided in the first slave synchronous switching device of the first sub uninterruptible power supply system is selected so as to synchronize with a voltage output by the second master synchronous switching device of the system. And uninterruptible power supply system. 第１のサブ無停電電源システムと第２のサブ無停電電源システムとを具備した無停電電源システムであって、前記第１のサブ無停電電源システムには並列に設けられた第１のマスタ無停電電源装置と第１のスレーブ無停電電源装置とにつながる第１のスレーブ同期切替え装置とが備えられており、前記第２のサブ無停電電源システムには、並列に設けられた第２のマスタ無停電電源装置と第２のスレーブ無停電電源装置とにつながる第２のマスタ同期切替え装置とが備えられており、前記第１のマスタ無停電電源装置には、第１のインバータ回路とこれに並列に第１のバイパス回路とが設けられており、前記第１のスレーブ無停電電源装置には、第２のインバータ回路とこれに並列に第２のバイパス回路とが設けられており、前記第２のマスタ無停電電源装置には第３のインバータ回路とこれに並列に第３のバイパス回路とが設けられており、前記第２のスレーブ無停電電源装置には、第４のインバータ回路とこれに並列に第４のバイパス回路とが設けられており、通常運転時には前記第１〜第４のインバータ回路はそれぞれ第１〜第４のバイパス回路の電圧が基準電圧となるよう前記第１、第２のマスタおよび第１、第２のスレーブ無停電電源装置内に設けられた回路が選択されており、前記第２のサブ無停電電源システムの第３または第４のバイパス回路のいずれかに異常が発生したとき、前記第３、第４のインバータ回路の基準電圧を、前記第１のサブ無停電電源システムの第１および第２のインバータ回路の基準電圧と同期するよう、前記第１のサブ無停電電源システムの前記第１のスレーブ同期切替え装置内に設けられた回路が選択されることを特徴とする無停電電源システム。An uninterruptible power supply system comprising a first sub uninterruptible power supply system and a second sub uninterruptible power supply system, wherein the first sub uninterruptible power supply system has a first master uninterruptible power supply provided in parallel. A second slave uninterruptible power supply system including a first slave synchronous switching device connected to the uninterruptible power supply and the first slave uninterruptible power supply; A second master synchronization switching device connected to the uninterruptible power supply and the second slave uninterruptible power supply; and the first master uninterruptible power supply includes a first inverter circuit and a first inverter circuit. A first bypass circuit is provided in parallel, and the first slave uninterruptible power supply is provided with a second inverter circuit and a second bypass circuit in parallel with the second inverter circuit. 2 trout The uninterruptible power supply is provided with a third inverter circuit and a third bypass circuit in parallel with the third inverter circuit. The second slave uninterruptible power supply is provided with a fourth inverter circuit and a third inverter circuit in parallel with the third inverter circuit. A fourth bypass circuit is provided, and the first and fourth inverter circuits are arranged such that the voltages of the first and fourth bypass circuits become the reference voltages during normal operation. And a circuit provided in the first and second slave uninterruptible power supplies is selected, and an abnormality has occurred in one of the third and fourth bypass circuits of the second sub uninterruptible power supply system At this time, the first sub-uninterruptible power supply is synchronized so that the reference voltages of the third and fourth inverter circuits are synchronized with the reference voltages of the first and second inverter circuits of the first sub-uninterruptible power supply system. system's Uninterruptible power supply system, characterized in that serial first slave synchronization switching circuit provided in the apparatus is selected. 第１のサブ無停電電源システムと第２のサブ無停電電源システムとを具備した無停電電源システムであって、前記第１のサブ無停電電源システムには、並列に設けられた第１のマスタ無停電電源装置と第１のスレーブ無停電電源装置とにつながる第１のスレーブ同期切替え装置とが備えられており、前記第２のサブ無停電電源システムには、並列に設けられた第２のマスタ無停電電源装置と第２のスレーブ無停電電源装置とにつながる第２のマスタ同期切替え装置とが備えられており、前記第１のマスタ無停電電源装置には、第１のインバータ回路とこれに並列に第１のバイパス回路とが設けられており、前記第１のスレーブ無停電電源装置には、第２のインバータ回路とこれに並列に第２のバイパス回路とが設けられており、前記第２のマスタ無停電電源装置には第３のインバータ回路とこれに並列に第３のバイパス回路とが設けられており、前記第２のスレーブ無停電電源装置には、第４のインバータ回路とこれに並列に第４のバイパス回路とが設けられており、前記無停電電源システムの通常運転時には前記第１〜第４のインバータ回路はそれぞれ第１〜第４のバイパス回路の電圧が基準電圧となるよう、前記第１、第２のマスタおよび第１、第２のスレーブ無停電電源装置内に設けられた回路が選択されているとともに、前記第１のスレーブ同期切替え装置にはスレーブ選択判定回路が設けられており、前記スレーブ選択判定回路の選択により、前記第１のスレーブ同期切替え装置と第２のマスタ同期切替え装置の機能を交代させるとともに、前記第１、第２のバイパス回路に異常が発生したとき、前記第１、第２のバイパス回路の基準電圧を前記第３、第４のインバータ回路の基準電圧を同期するよう、または第３、第４のバイパス回路に異常が発生したとき、前記第３、第４のバイパス回路の基準電圧を前記第１、第２のインバータ回路の基準電圧と同期するよう、前記第１のサブ無停電電源システムの前記第１のスレーブ同期切替え装置内に設けられた回路が選択されることを特徴とする無停電電源システム。An uninterruptible power supply system including a first sub uninterruptible power supply system and a second sub uninterruptible power supply system, wherein the first sub uninterruptible power supply system has a first master provided in parallel. A second slave uninterruptible power supply system is provided with a first slave synchronization switching device connected to the uninterruptible power supply and the first slave uninterruptible power supply. A second master synchronous switching device connected to the master uninterruptible power supply and the second slave uninterruptible power supply, wherein the first master uninterruptible power supply has a first inverter circuit and a first inverter circuit; A first bypass circuit is provided in parallel with the second inverter circuit, and the first slave uninterruptible power supply device is provided with a second inverter circuit and a second bypass circuit in parallel with the second inverter circuit. Second ma The uninterruptible power supply is provided with a third inverter circuit and a third bypass circuit in parallel with the third inverter circuit. The second slave uninterruptible power supply is provided with a fourth inverter circuit and a third inverter circuit in parallel with the third inverter circuit. And a fourth bypass circuit is provided, and during normal operation of the uninterruptible power supply system, the first to fourth inverter circuits are configured such that the voltages of the first to fourth bypass circuits become reference voltages, respectively. Circuits provided in the first and second masters and the first and second slave uninterruptible power supplies are selected, and the first slave synchronization switching device is provided with a slave selection determining circuit. The function of the first slave synchronization switching device and the function of the second master synchronization switching device are alternated by the selection of the slave selection determination circuit, and the first and second bypass circuits are switched. When an abnormality occurs, the reference voltage of the first and second bypass circuits is synchronized with the reference voltage of the third and fourth inverter circuits, or an abnormality occurs in the third and fourth bypass circuits. The first slave uninterruptible power supply system first slave synchronous switching so that the reference voltages of the third and fourth bypass circuits are synchronized with the reference voltages of the first and second inverter circuits. An uninterruptible power supply system, wherein a circuit provided in the device is selected.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8018746B2 (en) 2008-01-21 2011-09-13 Sanyo Denki Co., Ltd. Parallel inverter system
CN104503523A (en) * 2014-10-31 2015-04-08 广东易事特电源股份有限公司 UPS (uninterrupted power supply) parallel output system, master and slave units of UPS parallel output system and UPS parallel output voltage control method and device
CN109245280A (en) * 2018-09-29 2019-01-18 中广核研究院有限公司 A kind of nuclear safe level uninterruptible power system and its bypass voltage monitor warning circuit
JP7439979B1 (en) 2023-06-13 2024-02-28 富士電機株式会社 Uninterruptible power supply system and power supply method using the uninterruptible power supply system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8018746B2 (en) 2008-01-21 2011-09-13 Sanyo Denki Co., Ltd. Parallel inverter system
CN104503523A (en) * 2014-10-31 2015-04-08 广东易事特电源股份有限公司 UPS (uninterrupted power supply) parallel output system, master and slave units of UPS parallel output system and UPS parallel output voltage control method and device
CN104503523B (en) * 2014-10-31 2016-06-15 广东易事特电源股份有限公司 UPS Parallel opertation system and main frame therein and from machine, UPS Parallel opertation voltage control method and device
CN109245280A (en) * 2018-09-29 2019-01-18 中广核研究院有限公司 A kind of nuclear safe level uninterruptible power system and its bypass voltage monitor warning circuit
JP7439979B1 (en) 2023-06-13 2024-02-28 富士電機株式会社 Uninterruptible power supply system and power supply method using the uninterruptible power supply system

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