JP2010187431A - Uninterruptible power supply - Google Patents

Uninterruptible power supply Download PDF

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JP2010187431A
JP2010187431A JP2009028399A JP2009028399A JP2010187431A JP 2010187431 A JP2010187431 A JP 2010187431A JP 2009028399 A JP2009028399 A JP 2009028399A JP 2009028399 A JP2009028399 A JP 2009028399A JP 2010187431 A JP2010187431 A JP 2010187431A
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power supply
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uninterruptible power
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JP5223711B2 (en
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Hisashi Kobayashi
久詩 幸林
Toshinari Yamada
歳也 山田
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Fuji Electric Co Ltd
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Fuji Electric Systems Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply which is suitable as an uninterruptible power supply that generates a three-phase AC voltage of three-phase/four-line system so as to supply a three-phase/four-line load with electricity while operating a plurality of units mutually concurrently. <P>SOLUTION: An inverter control circuit 33 with an uninterruptible power supply 20 or an uninterruptible power supply 35 includes a command computer 71 which serves as a three-phase batch cross current suppressing means, adding computers 72-74, a three-phase power computer 75, a setter 76, an average computer 77, an adding computer 78, a voltage regulator 79, a three-phase sine wave generator 80, PWM computers 81-83, a gate driving circuit 84, single-phase power computers 85, 89 and 93 which serve as phase-specific individual cross current suppressing means, adding computers 86, 90 and 94, gain circuits 87, 91 and 95, adding computers 88, 92 and 96, and a three-phase power average computer 97. Owing to this, it is possible to sufficiently suppress even cross currents which are different in magnitude for each phase via a neutral phase. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、複数台を互いに並列運転させつつ三相４線負荷に給電するために三相４線式の三相交流電圧を発生するそれぞれの無停電電源装置に関する。   The present invention relates to respective uninterruptible power supply devices that generate a three-phase four-wire three-phase AC voltage to supply power to a three-phase four-wire load while operating a plurality of units in parallel.

図２は、この種の無停電電源装置を複数（ｋ）台並列運転してなる無停電電源システムの回路構成図である。   FIG. 2 is a circuit configuration diagram of an uninterruptible power supply system in which a plurality (k) of uninterruptible power supply devices of this type are operated in parallel.

図２において、１０は商用電源などの交流電源、２０，３５，４０，４２，６０，６２は三相４線式出力の無停電電源装置、２１，４１，６１は連結リアクトル、１１はこの無停電電源システムから三相４線負荷１２への各相電流を検出する電流検出器である。   In FIG. 2, 10 is an AC power source such as a commercial power source, 20, 35, 40, 42, 60, 62 are three-phase four-wire output uninterruptible power supply units, 21, 41, 61 are connected reactors, and 11 is this unit. It is a current detector that detects each phase current from the power failure power supply system to the three-phase four-wire load 12.

この連結リアクトル２１，４１，６１それぞれは、図示のように複数（ｋ）台の無停電電源装置を並列運転する際に、それぞれの無停電電源装置における出力間の相互干渉を軽減するために設置されている。なお、これらの連結リアクトルそれぞれのパーセントインピーダンス（％Ｚ）は数％程度に設定される。   Each of the connected reactors 21, 41, 61 is installed to reduce mutual interference between outputs in each uninterruptible power supply when multiple (k) uninterruptible power supplies are operated in parallel as shown in the figure. Has been. The percentage impedance (% Z) of each of these connected reactors is set to about several percent.

図３は、その回路構成が同一である図２の無停電電源装置２０，４０，６０のうち、無停電電源装置２０の詳細回路構成図であり、下記特許文献１の図１に開示されている構成と同等である。   3 is a detailed circuit configuration diagram of the uninterruptible power supply device 20 among the uninterruptible power supply devices 20, 40, and 60 of FIG. 2 having the same circuit configuration, and is disclosed in FIG. It is equivalent to the configuration.

この無停電電源装置２０には、交流電源１０の電圧を整流電圧に変換するダイオード整流回路などからなるコンバータ２２と、この整流電圧を平滑する電解コンデンサなどからなるコンデンサ２３とを備えている。また、コンデンサ２３の両端に接続されるＩＧＢＴ（絶縁ゲートバイポーラトランジスタ）とダイオードの逆並列回路などからなる２組の半導体スイッチ回路による中性相出力アーム２４と、コンデンサ２３の両端電圧を三相交流電圧に変換するＩＧＢＴとダイオードの逆並列回路などからなる６組の半導体スイッチ回路によるインバータ２５とを備えている。また、インバータ２５が出力する三相交流電圧の高調波成分を除去するフィルタリアクトル２６及びフィルタコンデンサ２７と、中性点出力リアクトル２８とを備えている。さらに、無停電電源装置２０の各相の出力電流を検出する電流検出器２９と、該無停電電源装置２０の各相の出力電圧を検出する電圧検出器３０とを備えている。そして、中性相出力アーム２４の両半導体スイッチ回路を交互に１対１の時間比率でオン・オフ動作させる中性相駆動回路２１と、インバータ２５から所望の周波数・振幅の三相交流電圧を出力するための制御を行うインバータ制御回路３２またはインバータ制御回路３３とを備えている。   The uninterruptible power supply 20 includes a converter 22 including a diode rectifier circuit that converts the voltage of the AC power supply 10 into a rectified voltage, and a capacitor 23 including an electrolytic capacitor that smoothes the rectified voltage. Further, a neutral phase output arm 24 by two sets of semiconductor switch circuits including an IGBT (insulated gate bipolar transistor) connected to both ends of the capacitor 23 and a diode, and a voltage at both ends of the capacitor 23 are converted into a three-phase alternating current. The inverter 25 is composed of six sets of semiconductor switch circuits including an IGBT for converting to a voltage and an antiparallel circuit of a diode. Moreover, the filter reactor 26 and the filter capacitor 27 which remove the harmonic component of the three-phase alternating current voltage which the inverter 25 outputs are provided, and the neutral point output reactor 28 is provided. Furthermore, a current detector 29 that detects an output current of each phase of the uninterruptible power supply 20 and a voltage detector 30 that detects an output voltage of each phase of the uninterruptible power supply 20 are provided. A neutral phase drive circuit 21 that alternately turns on and off the semiconductor switch circuits of the neutral phase output arm 24 at a time ratio of 1: 1, and a three-phase AC voltage having a desired frequency and amplitude from the inverter 25. An inverter control circuit 32 or an inverter control circuit 33 that performs control for output is provided.

なお、この無停電電源装置２０において、交流電源１０が何らかの要因で喪失したときにも図２に示した三相４線負荷１２への給電を継続するために、図示しないバッテリ回路がコンデンサ２３の両端に接続されている。   In this uninterruptible power supply 20, in order to continue power supply to the three-phase four-wire load 12 shown in FIG. Connected to both ends.

図４は、その回路構成が同一である図２の無停電電源装置３５，４２，６２のうち、無停電電源装置３５の詳細回路構成図であり、下記特許文献１の図３に開示されている構成と同等である。   4 is a detailed circuit configuration diagram of the uninterruptible power supply device 35 among the uninterruptible power supply devices 35, 42, and 62 of FIG. 2 having the same circuit configuration, and is disclosed in FIG. It is equivalent to the configuration.

この無停電電源装置３５が図３に示した無停電電源装置２０と異なる点は、コンデンサ２３に代えて、等容量の電解コンデンサなどからなるコンデンサ３６とコンデンサ３７とを直列接続したものになっている。さらに、コンデンサ３６とコンデンサ３７の中間接続点が三相４線式出力の中性点に接続されている。   The uninterruptible power supply 35 is different from the uninterruptible power supply 20 shown in FIG. 3 in that a capacitor 36 made of an electrolytic capacitor of equal capacity and a capacitor 37 are connected in series instead of the capacitor 23. Yes. Further, an intermediate connection point between the capacitor 36 and the capacitor 37 is connected to the neutral point of the three-phase four-wire output.

このように、コンデンサ３６とコンデンサ３７を直列接続した構成にすることにより、無停電電源装置３５の出力電圧が４００Ｖ程度のときにもコンデンサ３６およびコンデンサ３７の定格電圧をより低く設定できる特典を有するが、この無停電電源装置３５の動作原理は無停電電源装置２０と同じである。   As described above, the configuration in which the capacitor 36 and the capacitor 37 are connected in series has the advantage that the rated voltage of the capacitor 36 and the capacitor 37 can be set lower even when the output voltage of the uninterruptible power supply 35 is about 400V. However, the operation principle of the uninterruptible power supply 35 is the same as that of the uninterruptible power supply 20.

なお、この無停電電源装置３５において、交流電源１０が何らかの要因で喪失したときにも図２に示した三相４線負荷１２への給電を継続するために、図示しないバッテリ回路がコンデンサ３６とコンデンサ３７の直列回路の両端、またはコンデンサ３７の両端に接続されている。   In this uninterruptible power supply 35, in order to continue power supply to the three-phase four-wire load 12 shown in FIG. The capacitor 37 is connected to both ends of the series circuit or to both ends of the capacitor 37.

図５は、この発明の従来例としての回路構成を示し、無停電電源装置２０または無停電電源装置３５に備えるインバータ制御回路３２の詳細回路構成図である。   FIG. 5 shows a circuit configuration as a conventional example of the present invention, and is a detailed circuit configuration diagram of the inverter control circuit 32 provided in the uninterruptible power supply 20 or the uninterruptible power supply 35.

このインバータ制御回路３２には、指令値演算器７１と、加算演算器７２〜７４と、三相電力演算器７５と、設定器７６と、平均値演算器７７と、加算演算器７８と、電圧調節器７９と、三相正弦波発生器８０と、ＰＷＭ（パルス幅変調）演算器８１〜８３と、ゲート駆動回路８４とを備えている。   The inverter control circuit 32 includes a command value calculator 71, addition calculators 72 to 74, a three-phase power calculator 75, a setter 76, an average value calculator 77, an addition calculator 78, a voltage The controller 79 includes a three-phase sine wave generator 80, PWM (pulse width modulation) calculators 81 to 83, and a gate drive circuit 84.

図５に示したインバータ制御回路３２の動作を、図２〜４に示した回路構成図を参照しつつ、以下に説明する。   The operation of the inverter control circuit 32 shown in FIG. 5 will be described below with reference to the circuit configuration diagrams shown in FIGS.

先ず、指令値演算器７１では、三相４線負荷１２への各相電流を検出する電流検出器１１からの負荷電流検出値それぞれを図２に示す並列台数（ｋ）で除算演算した各相の電流指令値を生成している。これらの電流指令値から、図３または図４に示した電流検出器２９から得られる各相の出力電流検出値を加算演算器７２〜７４により減算演算してなる各相の電流偏差Δｉｕ，Δｉｖ，Δｉｗを求めている。   First, in the command value calculator 71, each phase obtained by dividing each load current detection value from the current detector 11 for detecting each phase current to the three-phase four-wire load 12 by the number of parallel units (k) shown in FIG. The current command value is generated. Current deviations Δiu, Δiv of each phase obtained by subtracting the output current detection values of the respective phases obtained from the current detector 29 shown in FIG. 3 or FIG. 4 by the addition calculators 72 to 74 from these current command values. , Δiw.

また、三相電力演算器７５では、前記各相の電流流偏差Δｉｕ，Δｉｖ，Δｉｗに基づいた三相平均電力演算を行い、この演算結果の有効電力成分を有効電力成分偏差Δｐとして出力し、該演算結果の無効電力成分を無効電力成分偏差Δｑとして出力している。   The three-phase power calculator 75 performs a three-phase average power calculation based on the current flow deviations Δiu, Δiv, Δiw of the respective phases, and outputs the active power component of the calculation result as an active power component deviation Δp. The reactive power component of the calculation result is output as a reactive power component deviation Δq.

この有効電力成分偏差Δｐは並列運転する際の出力電圧の位相差に起因する値であり、また、無効電力成分偏差Δｑは並列運転する際の出力電圧の振幅差に起因する値であることが知られている。   The active power component deviation Δp is a value resulting from the phase difference of the output voltage during parallel operation, and the reactive power component deviation Δq is a value resulting from the amplitude difference of the output voltage during parallel operation. Are known.

設定器７６では無停電電源装置２０または無停電電源装置３５の出力の電圧設定値を設定している。また、電圧検出器３０から得られる前記無停電電源装置の各相の出力電圧検出値に平均値演算器７７を介することにより三相電圧平均値Ｖａｖを得ている。   In the setting device 76, the voltage setting value of the output of the uninterruptible power supply 20 or the uninterruptible power supply 35 is set. The three-phase voltage average value Vav is obtained by passing the average voltage calculator 77 to the output voltage detection value of each phase of the uninterruptible power supply obtained from the voltage detector 30.

従って、加算演算器７８では、前記無効電力成分偏差Δｑと電圧設定値と三相電圧平均値Ｖａｖとに対して図示の極性での加減算を行い、これを電圧偏差として電圧調節器７９に入力している。   Therefore, the addition calculator 78 performs addition / subtraction with the polarity shown in the figure on the reactive power component deviation Δq, the voltage setting value, and the three-phase voltage average value Vav, and inputs this to the voltage regulator 79 as a voltage deviation. ing.

電圧調節器７９では前記電圧偏差を零にするために、該偏差の比例―積分演算などの調節演算を行い、この演算結果は三相電圧指令値Ｖｓとして出力している。   In order to make the voltage deviation zero, the voltage regulator 79 performs adjustment calculation such as proportional-integral calculation of the deviation, and the calculation result is output as a three-phase voltage command value Vs.

すなわち三相正弦波発生器８０では、周知の技術を用いて、基準の三相正弦波に対して前記有効電力成分偏差Δｐに基づく位相補正を行いつつ、各相の電圧振幅値Ｖｕ，Ｖｖ，Ｖｗそれぞれを前記三相電圧指令値Ｖｓに基づいた値に設定した各相の正弦波状の電圧指令値ｖｕ，ｖｖ，ｖｗを出力している。   That is, in the three-phase sine wave generator 80, the phase amplitude based on the active power component deviation Δp is corrected with respect to the reference three-phase sine wave using a known technique, while the voltage amplitude values Vu, Vv, The voltage command values vu, vv, and vw of sinusoidal waveforms for each phase, in which Vw is set to a value based on the three-phase voltage command value Vs, are output.

ＰＷＭ演算器８１〜８３それぞれは、前記電圧指令値ｖｕ，ｖｖ，ｖｗと、例えば三角波状のキャリア信号とに基づく各相毎のパルス幅変調演算を行い、これらの演算結果に基づいて、ゲート駆動回路８４では、インバータ２５を構成する各相（各アーム）のＩＢＧＴへの駆動信号を生成している。   Each of the PWM calculators 81 to 83 performs a pulse width modulation calculation for each phase based on the voltage command values vu, vv, vw and, for example, a triangular wave carrier signal, and based on these calculation results, gate drive The circuit 84 generates a drive signal to the IBGT of each phase (each arm) constituting the inverter 25.

特開２０００−２２４８６２号公報JP 2000-224862 A 特開２００７−１５１２１３号公報JP 2007-151213 A

図５に示した従来のインバータ制御回路３２を用いた無停電電源装置２０または無停電電源装置３５と、これらと同一構成の無停電電源装置４０，６０または無停電電源装置４２，６２とを並列運転しつつ、三相電源を使用する三相電源機器と、各相の相電圧を利用した単相電源機器とが混在する三相４線負荷１２に給電することが行われる。   The uninterruptible power supply 20 or the uninterruptible power supply 35 using the conventional inverter control circuit 32 shown in FIG. 5 and the uninterruptible power supply 40 or 60 or the uninterruptible power supply 42 or 62 having the same configuration as these are paralleled. While driving, power is supplied to a three-phase four-wire load 12 in which a three-phase power supply device using a three-phase power supply and a single-phase power supply device using a phase voltage of each phase are mixed.

このような給電状態では、中性相（Ｎ相）を介して各相毎にその大きさが異なる横流が生じることがあるが、従来のインバータ制御回路３２では、三相一括して横流を抑制する三相平均値での横流抑制手段のみを用いているために、各相毎の横流を十分に抑制できないという問題点があった。   In such a power supply state, cross currents having different sizes may be generated for each phase via the neutral phase (N phase). However, in the conventional inverter control circuit 32, the cross current is suppressed in a batch of three phases. Since only the cross current suppression means with the three-phase average value is used, there is a problem that the cross current for each phase cannot be sufficiently suppressed.

例えば、上記特許文献２の図１に開示されている構成では、三相一括して横流を抑制しつつ、無停電電源装置と負荷との間のケーブルに起因した電圧降下も補償しているが、各相毎にその大きさが異なる横流が生じるときには、その抑制対策が考慮されていない。   For example, in the configuration disclosed in FIG. 1 of Patent Document 2, the voltage drop caused by the cable between the uninterruptible power supply and the load is compensated while suppressing the cross current in three phases. When a cross current having a different size is generated for each phase, the suppression measure is not considered.

この発明の目的は、上記問題点を解消した無停電電源装置を提供することにある。   An object of the present invention is to provide an uninterruptible power supply that solves the above problems.

上記問題点を解消するためのこの第１の発明は、三相４線式の三相交流電圧を出力する無停電電源装置を複数（ｋ）台並列運転させる際に、
それぞれの前記無停電電源装置では、各相の負荷電流それぞれをｋ分の１した値と、それぞれの無停電電源装置の各相の出力電流との偏差それぞれから三相有効電力成分偏差と三相無効電力成分偏差とを導出する。そして、これらの導出した成分偏差に基づき前記無停電電源装置では、三相一括して横流を抑制する三相一括横流抑制手段を動作させる。この三相一括横流抑制手段の動作と同時に、前記各相の出力電流との偏差それぞれから導出される単相有効電力成分偏差それぞれに基づき該無停電電源装置における各相毎にその横流を抑制する各相個別横流抑制手段も動作させることを特徴とする。 This first invention for solving the above problem is that when operating a plurality of (k) uninterruptible power supply devices that output a three-phase four-wire three-phase AC voltage in parallel,
In each of the uninterruptible power supplies, the three-phase active power component deviation and the three-phase are calculated from the deviation between the value obtained by dividing the load current of each phase by k and the output current of each phase of each uninterruptible power supply. The reactive power component deviation is derived. Then, based on these derived component deviations, the uninterruptible power supply operates the three-phase collective cross current suppressing means that suppresses the cross current in three phases. Simultaneously with the operation of the three-phase collective cross current suppressing means, the cross current is suppressed for each phase in the uninterruptible power supply based on the single-phase active power component deviation derived from the deviation from the output current of each phase. The individual cross current suppressing means for each phase is also operated.

また、第２の発明は前記第１の発明の無停電電源装置において、
前記三相一括横流抑制手段から得られた前記インバータが出力する３相交流電圧の三相一括した電圧振幅指令値に、前記各相個別横流抑制手段から得られた該インバータが出力する各相交流電圧それぞれの電圧補正値を加算し、これらの加算した値を各相交流電圧の電圧振幅指令値としたことを特徴とする。 Moreover, 2nd invention is the uninterruptible power supply of the said 1st invention,
Each phase alternating current output by the inverter obtained from the individual phase cross current suppressing means is added to the three-phase voltage reference value of the three phase alternating voltage output from the inverter obtained from the three phase collective current suppressing means. The voltage correction value of each voltage is added, and the added value is used as the voltage amplitude command value of each phase AC voltage.

この発明では、三相４線式の三相交流電圧を出力する無停電電源装置それぞれに、三相一括横流抑制手段と各相個別横流抑制手段の双方を備えることにより、中性相を介した各相毎のその大きさが異なる横流に対しても、その横流を十分に抑制することができる。   In this invention, each uninterruptible power supply device that outputs a three-phase four-wire three-phase AC voltage includes both a three-phase collective cross current suppressing means and an individual phase individual cross current suppressing means, so that a neutral phase is interposed. The cross current can be sufficiently suppressed even for a cross current having a different size for each phase.

この発明の実施例を示す無停電電源装置のインバータ制御回路の回路構成図The circuit block diagram of the inverter control circuit of the uninterruptible power supply which shows the Example of this invention 無停電電源システムの回路構成図Circuit diagram of uninterruptible power supply system 図２の部分詳細回路構成としての無停電電源装置の回路構成図Circuit configuration diagram of the uninterruptible power supply as a partial detailed circuit configuration of FIG. 図２の部分詳細回路構成としての図３とは別の無停電電源装置の回路構成図Circuit configuration diagram of the uninterruptible power supply different from FIG. 3 as the partial detailed circuit configuration of FIG. 従来例を示す無停電電源装置のインバータ制御回路の回路構成図Circuit diagram of inverter control circuit of uninterruptible power supply device showing conventional example

図１は、この発明の実施例としての回路構成を示し、無停電電源装置２０または無停電電源装置３５に備えるインバータ制御回路３３の詳細回路構成図である。   FIG. 1 shows a circuit configuration as an embodiment of the present invention, and is a detailed circuit configuration diagram of an inverter control circuit 33 provided in the uninterruptible power supply 20 or the uninterruptible power supply 35.

このインバータ制御回路３３には、先述のインバータ制御回路３２と同様に、三相一括横流抑制手段としての指令値演算器７１，加算演算器７２〜７４，三相電力演算器７５，設定器７６，平均値演算器７７，加算演算器７８，電圧調節器７９と、三相正弦波発生器８０と、ＰＷＭ演算器８１〜８３と、ゲート駆動回路８４とを備えている。また、これらの他に、各相個別横流抑制手段としての単相電力演算器８５，８９，９３と、加算演算器８６，９０，９４と、ゲイン回路８７，９１，９５と、加算演算器８８，９２，９６と、三相電力平均演算器９７とが追加装備されている。   Similarly to the inverter control circuit 32 described above, the inverter control circuit 33 includes a command value computing unit 71, an addition computing units 72 to 74, a three-phase power computing unit 75, a setting unit 76, An average value calculator 77, an addition calculator 78, a voltage regulator 79, a three-phase sine wave generator 80, PWM calculators 81 to 83, and a gate drive circuit 84 are provided. In addition to these, single-phase power calculators 85, 89, and 93, addition calculators 86, 90, and 94, gain circuits 87, 91, and 95, and addition calculator 88 as individual cross current suppression means for each phase. , 92, 96 and a three-phase power average calculator 97 are additionally provided.

図１に示したインバータ制御回路３３の動作を、上述の追加装備された構成要素の動作を中心に、図２〜４に示した回路構成図を参照しつつ、以下に説明する。   The operation of the inverter control circuit 33 shown in FIG. 1 will be described below with reference to the circuit configuration diagrams shown in FIGS.

先ず、加算演算器７２〜７４により得られた各相の電流偏差Δｉｕ，Δｉｖ，Δｉｗのうち、単相電力演算器８５では、Δｉｕに基づく単相電力演算を行い、その有効電力成分を有効電力成分偏差として出力する。加算演算器８６では後述の各相の有効電力成分偏差の平均値と前記有効電力成分偏差との差を求め、得られた差を零にするためのゲインＫｕが設定されたゲイン回路８７を介することにより、Ｕ相の電圧補正値ΔＶｕを得ている。   First, out of the current deviations Δiu, Δiv, Δiw of the respective phases obtained by the addition calculators 72 to 74, the single-phase power calculator 85 performs a single-phase power calculation based on Δiu and converts the active power component into the active power. Output as component deviation. The addition calculator 86 obtains the difference between the average value of the active power component deviation of each phase, which will be described later, and the active power component deviation, and passes through the gain circuit 87 in which the gain Ku for setting the obtained difference to zero is set. Thus, the U-phase voltage correction value ΔVu is obtained.

同様に、単相電力演算器８９では、前記Δｉｖに基づく単相電力演算を行い、その有効電力成分を有効電力成分偏差として出力する。加算演算器９０では後述の各相の有効電力成分偏差の平均値と前記有効電力成分偏差との差を求め、得られた差を零にするためのゲインＫｖが設定されたゲイン回路９１を介することにより、V相の電圧補正値ΔＶｖを得ている。   Similarly, the single-phase power calculator 89 performs single-phase power calculation based on the Δiv and outputs the active power component as an active power component deviation. The addition calculator 90 obtains the difference between the average value of the active power component deviation of each phase, which will be described later, and the active power component deviation, and passes through the gain circuit 91 in which the gain Kv for setting the obtained difference to zero is set. Thus, a V-phase voltage correction value ΔVv is obtained.

同様に、単相電力演算器９３では、前記Δｉｗに基づく単相電力演算を行い、その無効電力成分を有効電力成分偏差として出力する。加算演算器９４では後述の各相の有効電力成分偏差の平均値と前記有効電力成分偏差との差を求め、得られた差を零にするためのゲインＫｗが設定されたゲイン回路９５を介することにより、W相の電圧補正値ΔＶｗを得ている。   Similarly, the single phase power calculator 93 performs a single phase power calculation based on the Δiw and outputs the reactive power component as an active power component deviation. The addition calculator 94 obtains the difference between the average value of the active power component deviation of each phase, which will be described later, and the active power component deviation, and passes through the gain circuit 95 in which the gain Kw for setting the obtained difference to zero is set. As a result, a W-phase voltage correction value ΔVw is obtained.

これらの電圧補正値ΔＶｕ，ΔＶｖ，ΔＶｗそれぞれは、加算演算器８８，９２，９６により電圧調節器７９の出力である三相電圧指令値Ｖｓと加算され、この加算値それぞれは三相正弦波発生器８０における電圧振幅値Ｖｕ，Ｖｖ，Ｖｗそれぞれとしている。   These voltage correction values ΔVu, ΔVv, and ΔVw are added to the three-phase voltage command value Vs that is the output of the voltage regulator 79 by the addition calculators 88, 92, and 96, and each of these addition values generates a three-phase sine wave. The voltage amplitude values Vu, Vv, Vw in the device 80 are respectively set.

なお、三相電力平均演算器９７は、単相電力演算器８５，８９，９３それぞれから得られた各相の有効電力成分偏差の平均値を求めるために設置されている。   The three-phase power average calculator 97 is installed to obtain the average value of the active power component deviations of the respective phases obtained from the single-phase power calculators 85, 89, and 93, respectively.

その結果、このインバータ制御回路３３を用いた無停電電源装置２０または無停電電源装置３５と、これらと同一構成の無停電電源装置４０，６０または無停電電源装置４２，６２とを並列運転しつつ、中性相を介した各相毎のその大きさが異なる横流に対しても、その横流を十分に抑制することができる。また、追加装備された上述の各相個別横流抑制手段を動作させるためには、新たな検出器などを設ける必要性が無い。   As a result, the uninterruptible power supply 20 or the uninterruptible power supply 35 using the inverter control circuit 33 and the uninterruptible power supply 40 or 60 or the uninterruptible power supply 42 or 62 having the same configuration as these are operated in parallel. The cross current can be sufficiently suppressed even with respect to the cross current having different sizes for each phase via the neutral phase. Further, there is no need to provide a new detector or the like in order to operate the above-mentioned individual phase individual cross current suppressing means additionally provided.

１０…交流電源、１１…電流検出器、１２…三相４線負荷、２０，３５，４０，４２，６０，６２…無停電電源装置、２１，４１，６１…連結リアクトル、２２…コンバータ、２３…コンデンサ、２４…中性相出力アーム、２５…インバータ、２６…フィルタリアクトル、２７…フィルタコンデンサ、２８…中性点出力リアクトル、２９…電流検出器、３０…電圧検出器、３１…中性相駆動回路、３２，３３…インバータ制御回路、７１…指令値演算器、７２〜７４…加算演算器、７５…三相電力演算器、７６…設定器、７７…平均値演算器、７８…加算演算器、７９…電圧調節器、８０…三相正弦波発生器、８１〜８３…ＰＷＭ演算器、８４…ゲート駆動回路、８５，８９，９３…単相電力演算器、８６，８８，９０，９２，９４，９６…加算演算器、８７，９１，９５…ゲイン回路、９７…三相電力平均演算器。   DESCRIPTION OF SYMBOLS 10 ... AC power source, 11 ... Current detector, 12 ... Three-phase four-wire load, 20, 35, 40, 42, 60, 62 ... Uninterruptible power supply device, 21, 41, 61 ... Connection reactor, 22 ... Converter, 23 DESCRIPTION OF SYMBOLS ... Capacitor 24 ... Neutral phase output arm 25 ... Inverter 26 ... Filter reactor 27 ... Filter capacitor 28 ... Neutral point output reactor 29 ... Current detector 30 ... Voltage detector 31 ... Neutral phase Drive circuit, 32, 33 ... inverter control circuit, 71 ... command value calculator, 72-74 ... addition calculator, 75 ... three-phase power calculator, 76 ... setter, 77 ... average value calculator, 78 ... addition calculation 79 ... Voltage regulator, 80 ... Three-phase sine wave generator, 81-83 ... PWM calculator, 84 ... Gate drive circuit, 85, 89, 93 ... Single-phase power calculator, 86, 88, 90, 92 , 94, 96 ... Calculation calculator, 87,91,95 ... gain circuit, 97 ... three-phase power average calculator.

Claims (2)

交流電源の電圧を整流電圧に変換するコンバータと、この整流電圧を平滑するコンデンサと、このコンデンサの両端に接続される２組の半導体スイッチ回路からなる中性相出力アームと、前記コンデンサの両端電圧を三相交流電圧に変換して出力するインバータと、この三相交流電圧の高調波成分を除去するフィルタリアクトルおよびフィルタコンデンサと、中性点出力リアクトルと、前記中性相出力アームの両半導体スイッチ回路を交互にオン・オフ動作させる中性相駆動回路と、前記インバータから所望の周波数・振幅の三相交流電圧を出力するための制御を行うインバータ制御回路とを備え、
前記中性相出力アームの中間接続点と前記中性点出力リアクトルの一端とを接続し、該中性点出力リアクトルの他端を中性点にして三相４線式の三相交流電圧を出力する無停電電源装置において、
前記無停電電源装置を複数（ｋ）台並列運転させつつ三相４線負荷に給電するときの
それぞれの前記無停電電源装置のインバータ制御回路には、
前記三相４線負荷に流れる各相の負荷電流それぞれを前記ｋ分の１した値と、それぞれの無停電電源装置の各相の出力電流との偏差それぞれから導出される三相有効電力成分偏差と三相無効電力成分偏差とに基づき該無停電電源装置における三相一括した横流を抑制する三相一括横流抑制手段と、
前記各相の出力電流との偏差それぞれから導出される単相有効電力成分偏差それぞれに基づき前記無停電電源装置における各相毎にその横流を抑制する各相個別横流抑制手段とを備えたことを特徴とする無停電電源装置。 A converter for converting the voltage of the AC power source into a rectified voltage, a capacitor for smoothing the rectified voltage, a neutral phase output arm composed of two sets of semiconductor switch circuits connected to both ends of the capacitor, and a voltage across the capacitor An inverter that converts a three-phase AC voltage into an output, a filter reactor and a filter capacitor that remove harmonic components of the three-phase AC voltage, a neutral point output reactor, and both semiconductor switches of the neutral phase output arm A neutral phase drive circuit that alternately turns on and off the circuit, and an inverter control circuit that performs control to output a three-phase AC voltage having a desired frequency and amplitude from the inverter,
An intermediate connection point of the neutral phase output arm is connected to one end of the neutral point output reactor, and a three-phase four-wire three-phase AC voltage is generated with the other end of the neutral point output reactor as a neutral point. In the uninterruptible power supply that outputs,
In the inverter control circuit of each uninterruptible power supply when supplying power to a three-phase four-wire load while operating the uninterruptible power supply in parallel with a plurality (k) units,
Three-phase active power component deviation derived from the difference between the value obtained by dividing the load current of each phase flowing through the three-phase four-wire load by k and the output current of each phase of each uninterruptible power supply And three-phase collective cross current suppressing means for suppressing three-phase collective cross current in the uninterruptible power supply based on the three-phase reactive power component deviation,
Each phase individual cross current suppression means for suppressing the cross current for each phase in the uninterruptible power supply based on each single phase active power component deviation derived from each deviation from the output current of each phase Uninterruptible power supply. 請求項１に記載の無停電電源装置において、
前記三相一括横流抑制手段から得られた前記インバータが出力する３相交流電圧の三相一括した電圧振幅指令値に、前記各相個別横流抑制手段から得られた該インバータが出力する各相交流電圧それぞれの電圧補正値を加算し、これらの加算した値を各相交流電圧の電圧振幅指令値としたことを特徴とする無停電電源装置。 In the uninterruptible power supply according to claim 1,
Each phase alternating current output by the inverter obtained from the individual phase cross current suppressing means is added to the three-phase voltage reference value of the three phase alternating voltage output from the inverter obtained from the three phase collective current suppressing means. An uninterruptible power supply characterized in that voltage correction values for each voltage are added and the added value is used as a voltage amplitude command value for each phase AC voltage.
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