JP5375130B2 - Uninterruptible power system - Google Patents

Uninterruptible power system Download PDF

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JP5375130B2
JP5375130B2 JP2009013977A JP2009013977A JP5375130B2 JP 5375130 B2 JP5375130 B2 JP 5375130B2 JP 2009013977 A JP2009013977 A JP 2009013977A JP 2009013977 A JP2009013977 A JP 2009013977A JP 5375130 B2 JP5375130 B2 JP 5375130B2
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uninterruptible power
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義彦 山方
幹介 藤井
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Fuji Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply apparatus which is suitable for supplying power to a load while operating uninterruptible power supply units comprising a converter, a storage battery circuit and an inverter in parallel. <P>SOLUTION: The uninterruptible power supply apparatus includes a first uninterruptible power supply unit 12, a second uninterruptible power supply unit 13, a k-th uninterruptible power supply unit 14 and a common operating control unit 17 for collectively controlling the respective operating states of the converter constituting these uninterruptible power supply units. The common operating control unit 17 comprises a setting unit 41, an average computer 42, an adder 43, a voltage regulator 44, a reference sine wave generator 45, a multiplying amplifier 46, an adder 47, a current adjuster 48, a PWM controller 49 and an average computer 50. The input current waveform from an AC power supply 1 is controlled to be a sine wave, and a power factor of a fundamental wave as seen from the AC power supply 1 is controlled to nearly one, thereby attaining standardization of each component of the uninterruptible power supply apparatus and cost reduction in the uninterruptible power supply apparatus on the whole, even in a structure wherein the number of uninterruptible power supply units in parallel operation is different. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

この発明は、交流電源の電圧を直流電圧に変換して出力するコンバータと、このコンバータの出力端に接続される蓄電池回路と、前記直流電圧を所望の周波数・振幅の交流電圧に変換して出力するインバータとからなる無停電電源ユニットを複数組並列運転しつつ負荷に給電する無停電電源装置に関する。   The present invention relates to a converter for converting the voltage of an AC power source into a DC voltage and outputting it, a storage battery circuit connected to the output terminal of the converter, and converting the DC voltage into an AC voltage having a desired frequency and amplitude for output. The present invention relates to an uninterruptible power supply that feeds power to a load while operating in parallel a plurality of uninterruptible power supply units including inverters.

図４は、この種の無停電電源装置の従来例を示すブロック構成図である。   FIG. 4 is a block diagram showing a conventional example of this type of uninterruptible power supply.

この図において、１は商用電源などの交流電源、２〜４は複数（ｋ）組の無停電電源ユニットとしての第１無停電電源ユニット，第２無停電電源ユニット・・第ｋ無停電電源ユニット、５は並列運転している前記無停電電源ユニットそれぞれから給電される負荷である。また、６は交流電源１から前記無停電電源ユニットそれぞれへの電流を検出する電流検出器である。さらに、７は前記無停電電源ユニットを構成するコンバータそれぞれの動作状態を一括して制御する共通駆動制御部である。   In this figure, 1 is an AC power supply such as a commercial power supply, 2 to 4 are a first (1) uninterruptible power supply unit, a second uninterruptible power supply unit as a plurality (k) uninterruptible power supply units, and a kth uninterruptible power supply unit Reference numeral 5 denotes a load fed from each of the uninterruptible power supply units operating in parallel. Reference numeral 6 denotes a current detector that detects a current from the AC power supply 1 to each of the uninterruptible power supply units. Further, 7 is a common drive control unit that collectively controls the operation states of the converters constituting the uninterruptible power supply unit.

図５は、図４に示し互いにその構成が同じである第１無停電電源ユニット２，第２無停電電源ユニット３・・第ｋ無停電電源ユニット４のうち、第１無停電電源ユニット２の回路構成図である。   FIG. 5 shows the first uninterruptible power supply unit 2 among the first uninterruptible power supply unit 2, the second uninterruptible power supply unit 3 and the kth uninterruptible power supply unit 4 shown in FIG. It is a circuit block diagram.

図５において、２１は入力リアクトルおよびスイッチング素子としての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をブリッジ接続した構成の電力変換回路からなるコンバータ、２２はコンバータ２１の出力端に接続され、交流電源１の電圧が喪失したときに備える蓄電池回路、２３はスイッチング素子としてのＩＧＢＴとダイオードの逆並列回路をブリッジ接続した構成の電力変換回路からなるインバータである。また、２４はインバータ２３が出力する交流電圧をＰＷＭ（パルス幅変調）制御により所望の周波数・振幅に制御するインバータ制御回路である。さらに、２５は交流電源１からコンバータ２１への入力電流を検出する電流検出器、２６は電流検出器２５で検出されたコンバータ２１への入力電流が、何らかの要因により、過大になったことを検知したときに論理１信号を出力する過電流保護回路である。   In FIG. 5, reference numeral 21 denotes a converter composed of a power conversion circuit having a bridge connection of an anti-parallel circuit of an input reactor and IGBT (insulated gate bipolar transistor) as a switching element and a diode, and 22 is connected to the output terminal of the converter 21. A storage battery circuit 23 provided when the voltage of the AC power supply 1 is lost is an inverter composed of a power conversion circuit having a configuration in which an anti-parallel circuit of an IGBT as a switching element and a diode is bridge-connected. Reference numeral 24 denotes an inverter control circuit that controls the AC voltage output from the inverter 23 to a desired frequency and amplitude by PWM (pulse width modulation) control. Furthermore, 25 is a current detector that detects an input current from the AC power source 1 to the converter 21, and 26 is a detection that the input current to the converter 21 detected by the current detector 25 has become excessive for some reason. This is an overcurrent protection circuit that outputs a logic 1 signal.

この電流検出器２５と過電流保護回路２６とは、第１無停電電源ユニット２，第２無停電電源ユニット３・・第ｋ無停電電源ユニット４のうち、何れかの無停電電源ユニットにも、単独でその入力電流が過電流状態に陥る恐れがあることに考慮し、さらに、この過電流状態に起因した当該無停電電源ユニット内部の損傷を防止するために、各無停電電源ユニット毎に備えるようにしている。   The current detector 25 and the overcurrent protection circuit 26 are provided in any of the first uninterruptible power supply unit 2, the second uninterruptible power supply unit 3, the kth uninterruptible power supply unit 4. In consideration of the fact that the input current may fall into an overcurrent state alone, and to prevent damage to the uninterruptible power supply unit due to this overcurrent state, I have to prepare.

また、２７は後述の共通駆動制御部７からのＰＷＭ信号に対して、過電流保護回路２６から論理１信号が出力しているときに、前記ＰＷＭ信号に基づいてコンバータ２１を構成するＩＧＢＴへのゲート信号を生成するゲート駆動回路２８への該ＰＷＭ信号の伝達を阻止するアンド素子である。さらに、２９は蓄電池回路２２の端子電圧、すなわち、コンバータ２１の出力電圧を検出する電圧検出器、３０は電圧検出器２９により得られた電圧検出値を前記共通駆動制御部７へ送出する際の信号送出抵抗としての抵抗素子である。   In addition, when a logic 1 signal is output from the overcurrent protection circuit 26 with respect to a PWM signal from the common drive control unit 7 to be described later, reference numeral 27 denotes an IGBT that constitutes the converter 21 based on the PWM signal. It is an AND element that blocks transmission of the PWM signal to the gate drive circuit 28 that generates the gate signal. Further, 29 is a voltage detector that detects the terminal voltage of the storage battery circuit 22, that is, the output voltage of the converter 21, and 30 is a voltage detector when the voltage detection value obtained by the voltage detector 29 is sent to the common drive controller 7. It is a resistance element as a signal transmission resistor.

図６は、図４に示した共通駆動制御部７の回路構成図であり、この図において、４１は各無停電電源ユニットに備えるコンバータの出力電圧指令値を設定する設定器である。   FIG. 6 is a circuit configuration diagram of the common drive control unit 7 shown in FIG.

また、４２は各無停電電源ユニットに備える電圧検出器と信号送出抵抗としての抵抗素子とを介して得られる第１無停電電源ユニット２，第２無停電電源ユニット３・・第ｋ無停電電源ユニット４それぞれを構成するコンバータの出力の電圧検出値の平均値に対応した値を、後述の図７に示す動作原理により、導出する平均値演算器である。   Reference numeral 42 denotes a first uninterruptible power supply unit 2, a second uninterruptible power supply unit 3, and a kth uninterruptible power supply obtained through a voltage detector provided in each uninterruptible power supply unit and a resistance element as a signal transmission resistor. This is an average value calculator for deriving a value corresponding to the average value of the voltage detection value of the output of the converter constituting each unit 4 according to the operating principle shown in FIG.

図７は平均値演算器４２などの動作を説明する回路図であり、この構成において、各無停電電源ユニットに備える信号送出抵抗として、同一抵抗値に設定された抵抗素子Ｒ１，Ｒ２・・Ｒｋ（例えば、それぞれ１０キロオームに設定）とし、各無停電電源ユニットに備える電圧検出器からの検出値をＶ１，Ｖ２・・Ｖｋとすると、終端抵抗Ｒｏ（例えば、１００キロオームに設定）の両端電圧Ｖｏは、前記Ｖ１，Ｖ２・・Ｖｋの平均値に基づく値になることは周知である。   FIG. 7 is a circuit diagram for explaining the operation of the average value calculator 42 and the like. In this configuration, the resistance elements R1, R2,... Rk set to the same resistance value as signal transmission resistors provided in the uninterruptible power supply units. (For example, set to 10 kilohms), and the detected values from the voltage detectors provided in each uninterruptible power supply unit are V1, V2,... Vk, the voltage Vo across the terminal resistance Ro (for example, set to 100 kilohms) Is well known to be a value based on the average value of V1, V2,.

また、図６に示す電圧調節器４４は、加算演算器４３により得られる前記出力電圧指令値と前記電圧検出値の平均値との偏差を零にするための調節演算を、例えば、比例―積分回路を用いて行っている。   Further, the voltage regulator 44 shown in FIG. 6 performs an adjustment calculation for making the deviation between the output voltage command value obtained by the addition calculator 43 and the average value of the detected voltage value zero, for example, proportional-integral This is done using a circuit.

以下にその動作を説明する図６に示した基準正弦波発生器４５，乗算演算器４６，加算演算器４７，電流調節器４８，ＰＷＭ制御器４９それぞれは、図５に示したコンバータ２１が三相ブリッジ構成であれば３組必要であるが、図６ではその１相分を記載している。   A reference sine wave generator 45, a multiplication calculator 46, an addition calculator 47, a current regulator 48, and a PWM controller 49 shown in FIG. In the case of a phase bridge configuration, three sets are required, but FIG. 6 shows one phase.

先ず、基準正弦波発生器４５は交流電源１の電圧検出値に基づきつつ、周知の技術を用いて、交流電源１の相電圧に位相同期した振幅一定の正弦波を発生させるものである。また、乗算演算器４６は前記正弦波に電流調節器４８の出力値、すなわち、前記出力電圧指令値と前記電圧検出値の平均値との偏差を零にする調節演算値を乗算演算し、この乗算演算値を正弦波状の電流指令値として出力するものである。   First, the reference sine wave generator 45 generates a sine wave having a constant amplitude that is phase-synchronized with the phase voltage of the AC power supply 1 using a known technique, based on the voltage detection value of the AC power supply 1. The multiplication calculator 46 multiplies the sine wave by an adjustment calculation value that makes the deviation between the output value of the current regulator 48, that is, the average value of the output voltage command value and the voltage detection value, zero. The multiplication operation value is output as a sinusoidal current command value.

電流調節器４８では、加算演算器４７により得られる前記電流指令値と、図４に示した電流検出器６の検出値、すなわち、交流電源１から前記無停電電源ユニットそれぞれへの電流の検出値との偏差を零にするための調節演算を、例えば、比例回路を用いて高速に行うようにしている。   In the current regulator 48, the current command value obtained by the addition calculator 47 and the detected value of the current detector 6 shown in FIG. 4, that is, the detected value of the current from the AC power supply 1 to each of the uninterruptible power supply units. The adjustment calculation for setting the deviation from zero to zero is performed at high speed using, for example, a proportional circuit.

また、ＰＷＭ制御器４９では、電流調節器４８の出力である正弦波状の調節演算値と、例えば、三角波状のキャリア信号とのＰＷＭ演算を行い、この演算結果をＰＷＭ信号として各無停電電源ユニットに備える前記アンド素子に送信している。   Further, the PWM controller 49 performs a PWM calculation of a sinusoidal adjustment calculation value that is the output of the current regulator 48 and, for example, a triangular wave carrier signal, and uses the calculation result as a PWM signal for each uninterruptible power supply unit. To the AND element.

すなわち、図４に示した従来の無停電電源装置では、交流電源１からの入力電流波形を正弦波状の波形になるように制御できるとともに、交流電源１から見た基本波力率をほぼ１になるように制御している。さらに、この無停電電源装置では、各無停電電源ユニットに備える前記インバータとインバータ制御回路とにより、周知の技術を用いて、各無停電電源ユニット間の横流を抑制しつつ互いに並列運転して、負荷５に給電している。   That is, in the conventional uninterruptible power supply shown in FIG. 4, the input current waveform from the AC power supply 1 can be controlled to be a sinusoidal waveform, and the fundamental wave power factor viewed from the AC power supply 1 is set to about 1. It is controlled to become. Furthermore, in this uninterruptible power supply device, the inverter and inverter control circuit provided in each uninterruptible power supply unit are operated in parallel with each other while suppressing the cross current between the uninterruptible power supply units using a known technique, Power is supplied to the load 5.

特開平８−１２６３２９号公報JP-A-8-126329

図４〜６に示した従来の無停電電源装置では、上述の無停電電源ユニットの並列運転数（ｋ）が負荷５の消費電力に基づいて設定される毎に、電流検出器６の製作仕様が異なることとなり、その結果、無停電電源装置全体をユニット構成で対応することの目論みに反するという問題点があった。また、前記特許文献１に開示されている構成においても、上記問題点は解消されていない。   In the conventional uninterruptible power supply shown in FIGS. 4 to 6, each time the parallel operation number (k) of the uninterruptible power supply unit is set based on the power consumption of the load 5, the production specifications of the current detector 6 As a result, there is a problem that it is contrary to the idea of dealing with the entire uninterruptible power supply in a unit configuration. In the configuration disclosed in Patent Document 1, the above problem is not solved.

この発明の目的は、上記問題点を解消できる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 capable of solving the above problems.

上述の問題点を解消するために、この第１の発明は、交流電源の電圧をＰＷＭ（パルス幅変調）制御により所望の直流電圧に変換して出力するコンバータと、このコンバータの出力端に接続される蓄電池回路と、前記直流電圧をＰＷＭ制御により所望の周波数・振幅の交流電圧に変換して出力するインバータとからなる無停電電源ユニットを複数組並列運転しつつ負荷に給電する無停電電源装置において、
前記コンバータそれぞれの入力側には、前記交流電源からの入力電流を検出する電流検出器と、この検出した電流信号を電圧信号に変換する信号変換器と、この信号変換器の出力に一端が接続される信号送出抵抗とを備えると共に、前記コンバータそれぞれの動作状態を一括して制御する共通駆動制御部を備え、
前記共通駆動制御部には、前記信号送出抵抗それぞれの他端の相互接続点に接続される終端抵抗と、この終端抵抗の両端電圧に基づいて前記交流電源からの入力電流とその波形を制御する電流制御手段とを備えたことを特徴とする。
In order to solve the above-mentioned problems, the first aspect of the present invention is a converter that converts the voltage of an AC power source into a desired DC voltage by PWM (pulse width modulation) control and outputs the converter, and is connected to the output terminal of the converter. Uninterruptible power supply for supplying power to a load while operating in parallel a plurality of uninterruptible power supply units comprising a storage battery circuit to be operated and an inverter that converts the DC voltage into an AC voltage of desired frequency and amplitude by PWM control In
A current detector that detects an input current from the AC power source, a signal converter that converts the detected current signal into a voltage signal, and one end connected to the output of the signal converter are connected to the input side of each converter. is the a signaling resistance Rutotomoni, a common drive control unit which collectively controls the operating state of the converter, respectively,
The common drive control unit controls a terminal resistor connected to an interconnection point at the other end of each of the signal transmission resistors, and an input current from the AC power source and a waveform thereof based on a voltage across the terminal resistor. And a current control means.

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、前記共通駆動制御部の電流制御手段では、前記交流電源からの入力電流波形を正弦波状の波形に制御するとともに、該交流電源から見た基本波力率をほぼ１に制御することを特徴とする。   According to a second aspect of the present invention, in the uninterruptible power supply according to the first aspect of the invention, the current control means of the common drive control unit controls the input current waveform from the AC power source to a sinusoidal waveform, and the AC The fundamental wave power factor as viewed from the power source is controlled to be approximately unity.

この発明は、前記交流電源から前記無停電電源ユニットを構成するコンバータへの入力電流を検出する電流検出器を備えることが一般的に行われていることに着目し、さらに、この電流検出器により得られた電流検出値を電圧信号に変換することにより、前記共通駆動制御部では、前記各無停電電源ユニットでの検出値の平均値に対応した値を簡単な回路構成で容易に得られることに着目してなされたものである。   The present invention pays attention to the fact that a current detector for detecting an input current from the AC power supply to the converter constituting the uninterruptible power supply unit is generally provided. By converting the obtained current detection value into a voltage signal, the common drive control unit can easily obtain a value corresponding to the average value of the detection values in each uninterruptible power supply unit with a simple circuit configuration. It was made paying attention to.

この発明の実施の形態を示す無停電電源装置のブロック構成図Block diagram of an uninterruptible power supply showing an embodiment of the present invention 図１に示した無停電電源ユニットの回路構成図Circuit configuration diagram of the uninterruptible power supply unit shown in FIG. 図１に示した共通駆動制御部の回路構成図Circuit diagram of the common drive control unit shown in FIG. 従来例を示す無停電電源装置のブロック構成図Block diagram of an uninterruptible power supply showing a conventional example 図４に示した無停電電源ユニットの回路構成図Circuit configuration diagram of the uninterruptible power supply unit shown in FIG. 図４に示した共通駆動制御部の回路構成図Circuit configuration diagram of the common drive control section shown in FIG. 図６の動作を説明する回路図Circuit diagram for explaining the operation of FIG.

図１は、この発明の実施の形態を示す無停電電源装置のブロック構成図である。   FIG. 1 is a block diagram of an uninterruptible power supply apparatus showing an embodiment of the present invention.

この図において、１は交流電源、１２〜１４は複数（ｋ）組の無停電電源ユニットとしての第１無停電電源ユニット，第２無停電電源ユニット・・第ｋ無停電電源ユニット、５は並列運転している前記無停電電源ユニットそれぞれから給電される負荷である。また、１７は前記無停電電源ユニットを構成するコンバータそれぞれの動作状態を一括して制御する共通駆動制御部である。   In this figure, 1 is an AC power source, 12 to 14 are a plurality of (k) uninterruptible power supply units, a first uninterruptible power supply unit, a second uninterruptible power supply unit, a kth uninterruptible power supply unit, and 5 are parallel. It is a load fed from each of the uninterruptible power supply units in operation. Reference numeral 17 denotes a common drive control unit that collectively controls the operation states of the converters constituting the uninterruptible power supply unit.

すなわち、図１に示した無停電電源装置が、図４に示した従来の無停電電源装置と大きく異なる点は、電流検出器６が削除されていることである。   In other words, the uninterruptible power supply shown in FIG. 1 is greatly different from the conventional uninterruptible power supply shown in FIG. 4 in that the current detector 6 is deleted.

図２は、図１に示し互いにその構成が同じである第１無停電電源ユニット１２，第２無停電電源ユニット１３・・第ｋ無停電電源ユニット１４のうち、第１無停電電源ユニット１２の回路構成図であり、この図において、図５に示した従来例構成と同一機能を有するものには同一符号を付している。   FIG. 2 shows the first uninterruptible power supply unit 12 among the first uninterruptible power supply unit 12, the second uninterruptible power supply unit 13 and the kth uninterruptible power supply unit 14 shown in FIG. FIG. 6 is a circuit configuration diagram, in which the same reference numerals are assigned to components having the same functions as those of the conventional configuration shown in FIG.

すなわち、この無停電電源ユニット１２にはコンバータ２１，蓄電池回路２２，インバータ２３，インバータ制御回路２４，電流検出器２５，アンド素子２７，ゲート駆動回路２８，電圧検出器２９，抵抗素子３０の他に、過電流保護回路２６ａと信号変換器３１と抵抗素子３２とを備えている。   That is, the uninterruptible power supply unit 12 includes a converter 21, a storage battery circuit 22, an inverter 23, an inverter control circuit 24, a current detector 25, an AND element 27, a gate drive circuit 28, a voltage detector 29, and a resistance element 30. The overcurrent protection circuit 26a, the signal converter 31, and the resistance element 32 are provided.

この信号変換器３１は、演算増幅素子などから形成され、交流電源１からの入力電流を検出する電流検出器２５が検出した電流信号に対応した電圧信号に変換するものであり、抵抗素子３２は信号変換器３０の出力に一端が接続される信号送出抵抗である。   The signal converter 31 is formed of an operational amplification element or the like, and converts it into a voltage signal corresponding to the current signal detected by the current detector 25 that detects the input current from the AC power source 1. A signal transmission resistor having one end connected to the output of the signal converter 30.

従って、過電流保護回路２６ａは、従来の過電流保護回路２６と同様に、電流検出器２５で検出されたコンバータ２１への入力電流の検出値に対応する電圧値が、何らかの要因により、過大になったことを検知したときに論理１信号を出力する機能を有する。   Therefore, as in the conventional overcurrent protection circuit 26, the overcurrent protection circuit 26a causes the voltage value corresponding to the detected value of the input current to the converter 21 detected by the current detector 25 to be excessive due to some factor. It has a function of outputting a logic 1 signal when it is detected.

図３は、図１に示した共通駆動制御部１７の回路構成図であり、この図において、図６に示した従来例構成と同一機能を有するものには同一符号を付している。   FIG. 3 is a circuit configuration diagram of the common drive control unit 17 shown in FIG. 1. In this figure, components having the same functions as those in the configuration of the conventional example shown in FIG.

すなわち、この共通駆動制御部１７には設定器４１，平均値演算器４２，加算演算器４３，電圧調節器４４，基準正弦波発生器４５，乗算演算器４６，加算演算器４７，電流調節器４８，ＰＷＭ制御器４９の他に、平均値演算器５０を備えている。   That is, the common drive control unit 17 includes a setter 41, an average value calculator 42, an addition calculator 43, a voltage regulator 44, a reference sine wave generator 45, a multiplication calculator 46, an addition calculator 47, and a current regulator. In addition to the 48 and PWM controller 49, an average value calculator 50 is provided.

以下にその動作を説明する平均値演算器５０および先述の基準正弦波発生器４５，乗算演算器４６，加算演算器４７，電流調節器４８，ＰＷＭ制御器４９それぞれは、図２に示したコンバータ２１が三相ブリッジ構成であれば３組必要であるが、図３ではその１相分を記載している。   The average value calculator 50 and the reference sine wave generator 45, the multiplier calculator 46, the adder calculator 47, the current controller 48, and the PWM controller 49, whose operations are described below, are the converters shown in FIG. If 21 is a three-phase bridge configuration, three sets are required, but FIG. 3 shows one phase.

平均値演算器５０は、各無停電電源ユニットに備える電流検出器と信号変換器と信号送出抵抗とを介して得られる第１無停電電源ユニット１２，第２無停電電源ユニット１３・・第ｋ無停電電源ユニット１４それぞれを構成するコンバータの入力電流の検出値の平均値に対応した値を、先述の図７に示す動作原理により、導出している。   The average value calculator 50 includes a first uninterruptible power supply unit 12, a second uninterruptible power supply unit 13, kth obtained through a current detector, a signal converter, and a signal transmission resistor included in each uninterruptible power supply unit. A value corresponding to the average value of the detected values of the input currents of the converters constituting each of the uninterruptible power supply units 14 is derived based on the operation principle shown in FIG.

従って、電流調節器４８では、加算演算器４７により得られる乗算演算器４６からの正弦波状の電流指令値と、平均値演算器５０からの平均値、すなわち、交流電源１から前記無停電電源ユニットそれぞれへの入力電流の検出値の平均値との偏差を零にするための調節演算を、例えば、比例回路を用いて高速に行うようにしている。   Therefore, in the current regulator 48, the sinusoidal current command value obtained from the multiplication computing unit 46 obtained by the addition computing unit 47 and the average value from the average value computing unit 50, that is, from the AC power source 1 to the uninterruptible power supply unit. The adjustment calculation for making the deviation from the average value of the detected values of the input current to each of them zero is performed at high speed using, for example, a proportional circuit.

すなわち、図１に示したこの発明の無停電電源装置においても、交流電源１からの入力電流波形を正弦波状の波形になるように制御できるとともに、交流電源１から見た基本波力率をほぼ１になるように制御することができる。   That is, in the uninterruptible power supply device of the present invention shown in FIG. 1, the input current waveform from the AC power source 1 can be controlled to be a sine waveform, and the fundamental wave power factor viewed from the AC power source 1 is substantially It can be controlled to be 1.

その結果、図１〜３に示したこの発明の無停電電源装置では、無停電電源ユニットの並列運転数が異なった構成でも、これらの無停電電源装置の各構成要素の標準化と、無停電電源装置全体としてのコストダウンとが図れる。   As a result, in the uninterruptible power supply of the present invention shown in FIGS. 1 to 3, even if the number of parallel operations of the uninterruptible power supply units is different, the standardization of each component of the uninterruptible power supply and the uninterruptible power supply The cost of the entire apparatus can be reduced.

１…交流電源、２〜４…無停電電源ユニット、５…負荷、６…電流検出器、７…共通駆動制御部、１２〜１４…無停電電源ユニット、１７…共通駆動制御部、２１…コンバータ、２２…蓄電池回路、２３…インバータ、２４…インバータ制御回路、２５…電流検出器、２６，２６ａ…過電流保護回路、２７…アンド素子、２８…ゲート駆動回路、２９…電圧検出器、３０…抵抗素子、３１…信号変換器、３２…抵抗素子、４１…設定器、４２…平均値演算器、４３…加算演算器、４４…電圧調節器、４５…基準正弦波発生器、４６…乗算演算器、４７…加算演算器、４８…電流調節器、４９…ＰＷＭ制御器、５０…平均値演算器。   DESCRIPTION OF SYMBOLS 1 ... AC power supply, 2-4 ... Uninterruptible power supply unit, 5 ... Load, 6 ... Current detector, 7 ... Common drive control part, 12-14 ... Uninterruptible power supply unit, 17 ... Common drive control part, 21 ... Converter , 22 ... storage battery circuit, 23 ... inverter, 24 ... inverter control circuit, 25 ... current detector, 26, 26a ... overcurrent protection circuit, 27 ... AND element, 28 ... gate drive circuit, 29 ... voltage detector, 30 ... Resistance element 31 ... Signal converter 32 ... resistance element 41 ... setter 42 ... average value calculator 43 ... addition calculator 44 ... voltage regulator 45 ... reference sine wave generator 46 ... multiplication calculation , 47 ... addition calculator, 48 ... current regulator, 49 ... PWM controller, 50 ... average value calculator.

Claims (2)

交流電源の電圧をＰＷＭ（パルス幅変調）制御により所望の直流電圧に変換して出力するコンバータと、このコンバータの出力端に接続される蓄電池回路と、前記直流電圧をＰＷＭ制御により所望の周波数・振幅の交流電圧に変換して出力するインバータとからなる無停電電源ユニットを複数組並列運転しつつ負荷に給電する無停電電源装置において、
前記コンバータそれぞれの入力側には、前記交流電源からの入力電流を検出する電流検出器と、この検出した電流信号を電圧信号に変換する信号変換器と、この信号変換器の出力に一端が接続される信号送出抵抗とを備えると共に、前記コンバータそれぞれの動作状態を一括して制御する共通駆動制御部を備え、
前記共通駆動制御部には、前記信号送出抵抗それぞれの他端の相互接続点に接続される終端抵抗と、この終端抵抗の両端電圧に基づいて前記交流電源からの入力電流とその波形を制御する電流制御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 desired DC voltage by PWM (pulse width modulation) control and outputting, a storage battery circuit connected to the output terminal of the converter, and the DC voltage with a desired frequency In the uninterruptible power supply that feeds the load while operating multiple sets of uninterruptible power supply units consisting of an inverter that converts to an alternating voltage of amplitude and outputs it,
A current detector that detects an input current from the AC power source, a signal converter that converts the detected current signal into a voltage signal, and one end connected to the output of the signal converter are connected to the input side of each converter. is the a signaling resistance Rutotomoni, a common drive control unit which collectively controls the operating state of the converter, respectively,
The common drive control unit controls a terminal resistor connected to an interconnection point at the other end of each of the signal transmission resistors, and an input current from the AC power source and a waveform thereof based on a voltage across the terminal resistor. An uninterruptible power supply comprising a current control means. 請求項１に記載の無停電電源装置において、
前記共通駆動制御部の電流制御手段では、前記交流電源からの入力電流波形を正弦波状の波形に制御するとともに、該交流電源から見た基本波力率をほぼ１に制御することを特徴とする無停電電源装置。 In the uninterruptible power supply according to claim 1,
The current control means of the common drive control unit controls the input current waveform from the AC power source to a sinusoidal waveform, and controls the fundamental wave power factor viewed from the AC power source to approximately 1. Uninterruptible power system.
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