JP3268181B2 - Inverter parallel operation device - Google Patents
Inverter parallel operation deviceInfo
- Publication number
- JP3268181B2 JP3268181B2 JP29678195A JP29678195A JP3268181B2 JP 3268181 B2 JP3268181 B2 JP 3268181B2 JP 29678195 A JP29678195 A JP 29678195A JP 29678195 A JP29678195 A JP 29678195A JP 3268181 B2 JP3268181 B2 JP 3268181B2
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- JP
- Japan
- Prior art keywords
- power supply
- supply control
- signal
- cross current
- phase difference
- Prior art date
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- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はインバータの並列運
転装置に関するもので、さらに詳しく言えば、複数台の
インバータが並列に接続され、各インバータ間に流れる
横流と各インバータ間の位相差に基づいて異常が生じた
インバータを切り離し、正常なインバータのみで運転を
続行することができるインバータの並列運転装置に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel operation device of inverters, and more particularly, to a plurality of inverters connected in parallel, based on a cross current flowing between the inverters and a phase difference between the inverters. The present invention relates to a parallel operation device of inverters capable of disconnecting an abnormal inverter and continuing operation only with a normal inverter.
【０００２】[0002]
【従来の技術】近年、（並列台数−１）台分の容量の負
荷に電力を供給しながら１台の点検や修理を行うことが
できる並列冗長方式によるインバータの並列運転が普及
し、種々の並列運転装置が知られている。2. Description of the Related Art In recent years, parallel operation of inverters by a parallel redundant system, which can perform inspection and repair of one unit while supplying power to a load having a capacity of (number of parallel units-1) units, has become widespread. Parallel operating devices are known.
【０００３】上記した並列冗長方式によってインバータ
を並列運転する場合には、各インバータ間に横流が流れ
ないようにするため、各インバータ間の電圧差、周波数
偏差、位相差、極性の差異をなくす必要がある。When the inverters are operated in parallel according to the above-described parallel redundancy system, it is necessary to eliminate the differences in voltage, frequency deviation, phase difference, and polarity between the inverters so that a cross current does not flow between the inverters. There is.
【０００４】また、上記した並列冗長方式によって並列
運転されるインバータは、過負荷時や事故時に無瞬断で
商用電源への切り替えが行えるようにし、その信頼性を
高めるようにしている。Further, the inverters operated in parallel by the above-mentioned parallel redundancy system can be switched to a commercial power supply without an instantaneous interruption at the time of an overload or an accident, so as to enhance the reliability.
【０００５】上記したインバータの並列運転装置には、
各インバータ間を高精度に同期させて運転を行うととも
に、各インバータと同期元のバイパス電源との間を高精
度に同期させて運転を行うための機能が設けられるとと
もに、外乱によってこれらの位相制御が過渡的に変化
し、それによって位相差が生じて各インバータ間に横流
が流れた場合にインバータが破損しないように保護回路
を動作させる機能が設けられている。[0005] The above-described parallel operation device of the inverter includes:
A function is provided to synchronize each inverter with high accuracy and to operate with high accuracy between each inverter and the synchronizing source bypass power supply. A function is provided for operating the protection circuit so that the inverters will not be damaged when a cross current flows between the inverters due to a transient change due to a phase difference.
【０００６】このようなインバータの並列運転装置の従
来例としては、特開平７−４６７６６号公報に記載され
たものがある。A conventional example of such a parallel operation device of inverters is disclosed in Japanese Patent Application Laid-Open No. 7-46766.
【０００７】上記したインバータの並列運転装置は、図
２に示したようなもので、第１のインバータ１の出力電
流を出力電流検出器１０で検出し、第２のインバータ２
の出力電流を出力電流検出器２０で検出し、それぞれ
を、差分演算器３に入力して各出力電流の差分を作成す
るとともに、比較器４に入力して各出力電流の大小比較
信号を作成し、前記差分と並列異常検出基準値とを並列
異常検出器５に入力して差分が並列異常検出基準値より
大の時に並列異常信号を送出し、この並列異常信号、前
記大小比較信号および並列運転中であることを表示する
並列運転信号を給電停止判別器６に入力して出力電流が
小である方のインバータを停止させる信号を給電制御駆
動回路１１または２１に送出して給電制御スイッチ１２
または２２を遮断させるようにしたものである。The above-mentioned inverter parallel operation device is as shown in FIG. 2, in which the output current of the first inverter 1 is detected by an output current detector 10 and the second inverter 2
Are output by the output current detector 20 and input to the difference calculator 3 to generate a difference between the output currents, and are input to the comparator 4 to generate a magnitude comparison signal between the output currents. Then, the difference and the parallel abnormality detection reference value are input to the parallel abnormality detector 5, and when the difference is larger than the parallel abnormality detection reference value, a parallel abnormality signal is transmitted, and the parallel abnormality signal, the magnitude comparison signal, and the parallel abnormality signal are output. A parallel operation signal indicating that the operation is being performed is input to the power supply stop discriminator 6 and a signal for stopping the inverter having the smaller output current is transmitted to the power supply control drive circuit 11 or 21 so that the power supply control switch 12
Or 22 is cut off.
【０００８】なお、前記第１のインバータ１および第２
のインバータ２は、バイパス電源からの同期元信号に対
応した基準パルスを作成するＰＬＬ回路１３，２３、こ
の基準パルスに対応した正弦波を作成する正弦波発生回
路１４，２４およびこの正弦波に基づいてインバータの
電圧波形歪を補正する波形補正信号を作成する波形補正
回路１５，２５によって各インバータを同期させてから
並列運転を開始するようにしている。The first inverter 1 and the second inverter 1
The inverter 2 includes PLL circuits 13 and 23 for generating reference pulses corresponding to the synchronization source signal from the bypass power supply, sine wave generation circuits 14 and 24 for generating sine waves corresponding to the reference pulses, and the sine waves. The parallel operation is started after the inverters are synchronized by the waveform correction circuits 15 and 25 that generate a waveform correction signal for correcting the voltage waveform distortion of the inverter.
【０００９】[0009]
【発明が解決しようとする課題】上記した従来のインバ
ータの並列運転装置では、出力電流が小である方のイン
バータを停止させているが、前述した如く、各インバー
タ間を高精度に同期させて運転を行うとともに、各イン
バータと同期元のバイパス電源との間を高精度に同期さ
せて運転を行うための機能が設けられているため、外乱
によってこれらの位相制御が過渡的に変化し、それによ
って位相差が生じて各インバータ間に横流が流れている
のか、いずれかのインバータに異常が生じて横流が流れ
ているのかの判別ができないという問題があった。In the above-described conventional parallel operation system of inverters, the inverter having the smaller output current is stopped. However, as described above, the inverters are synchronized with high accuracy. A function is provided to perform the operation and to synchronize the inverters and the bypass power source of the synchronization source with high precision, so that these phase controls change transiently due to disturbance. Therefore, there is a problem that it is not possible to determine whether a cross current is flowing between the inverters due to a phase difference or whether a cross current is flowing due to an abnormality in one of the inverters.
【００１０】[0010]
【課題を解決するための手段】上記課題を解決するた
め、本発明は、複数台のインバータの各々が給電制御ス
イッチを介して並列接続されてなるインバータの並列運
転装置において、各インバータの出力電流を検出して出
力電流対応値を出力する出力電流検出器と、この出力電
流対応値を相互に比較して各インバータ間に流れる横流
値に対応する横流信号を送出する横流検出器と、この横
流信号と横流基準信号とを比較して横流比較信号を送出
する横流比較器とを設け、かつ各インバータの同期元信
号に対応した基準パルスを作成するＰＬＬ回路と、この
基準パルスと同期元信号とを比較して位相差信号を送出
する位相差検出器とを設け、前記基準パルスに対応した
正弦波を正弦波発生回路によって作成し、この正弦波に
基づいて各インバータの電圧波形歪を波形補正回路によ
って補正するとともに、前記横流比較信号と前記位相差
信号とを入力し、各信号の少なくとも一方が正常であれ
ば前記給電制御スイッチの導通を継続させる給電制御信
号を送出する給電制御回路を設けたことを特徴とするも
のである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an inverter parallel operation device in which a plurality of inverters are connected in parallel via a power supply control switch. An output current detector for detecting an output current corresponding value and outputting the output current corresponding value; a cross current detector for comparing the output current corresponding values with each other to transmit a cross current signal corresponding to a cross current value flowing between the inverters; A PLL circuit for comparing the signal with the cross current reference signal and transmitting a cross current comparison signal, and generating a reference pulse corresponding to the synchronization source signal of each inverter; And a phase difference detector for transmitting a phase difference signal is provided, a sine wave corresponding to the reference pulse is created by a sine wave generation circuit, and each inverter is generated based on the sine wave. While correcting the voltage waveform distortion by a waveform correction circuit, the cross current comparison signal and the phase difference signal are input, and a power supply control signal for continuing conduction of the power supply control switch if at least one of the signals is normal. A power supply control circuit for transmitting is provided.
【００１１】また、本発明は、前記インバータの並列運
転装置において、給電制御回路は、横流比較信号／位相
差信号が正常であるかどうかを判定する過程と、位相差
信号／横流比較信号が正常であるかどうかを判定する過
程とを有し、横流比較信号／位相差信号が異常であると
判定された場合に位相差信号／横流比較信号が異常であ
れば給電制御スイッチを遮断させる給電制御信号を送出
させる機能を有し、この給電制御スイッチを遮断させる
給電制御信号を送出してから一定時間経過後再び位相差
信号／横流比較信号が正常であるかどうかを判定する過
程を有し、この位相差信号が正常であれば前記給電制御
スイッチを導通させる給電制御信号を送出させる機能を
有することを特徴とするものである。Further, in the present invention, in the parallel operation device of the inverters, the power supply control circuit may determine whether the cross current comparison signal / phase difference signal is normal, and the phase difference signal / cross current comparison signal may be normal. Determining whether or not the phase difference signal / phase difference signal is abnormal. If the phase difference signal / cross current comparison signal is abnormal, the power supply control switch is turned off. A function of transmitting a signal, and a step of determining whether or not the phase difference signal / cross current comparison signal is normal again after a lapse of a predetermined time after transmitting the power supply control signal for shutting off the power supply control switch, If the phase difference signal is normal, a function of transmitting a power supply control signal for turning on the power supply control switch is provided.
【００１２】[0012]
【発明の実施の形態】以下、本発明をその実施の形態に
基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on its embodiments.
【００１３】図１は本発明の実施の形態に係るインバー
タの並列運転装置のブロック図で、図２と同じ機能を有
する部分には同じ符号を付している。FIG. 1 is a block diagram of a parallel operation device of an inverter according to an embodiment of the present invention, and portions having the same functions as those in FIG. 2 are denoted by the same reference numerals.
【００１４】本発明の特徴は、各インバータ１，２の出
力電流を検出して出力電流対応値を出力する出力電流検
出器１０，２０と、この出力電流対応値を相互に比較し
て各インバータ間に流れる横流値に対応する横流信号を
送出する横流検出器１６，２６と、この横流信号と横流
基準信号とを比較して横流比較信号を送出する横流比較
器１７，２７とを設けるとともに、前記ＰＬＬ回路１
３，２３から送出される基準パルスとバイパス電源から
の同期元信号とを比較して位相差信号を送出する位相差
検出器１８，２８を設け、前記横流比較信号と位相差信
号とを入力して各信号の少なくとも一方が正常であれば
前記給電制御スイッチ１２，２２の導通を継続させる給
電制御信号を給電制御駆動回路１１，２１に送出する給
電制御回路１９，２９を設けたことである。The present invention is characterized in that output current detectors 10 and 20 for detecting output currents of the respective inverters 1 and 2 and outputting output current corresponding values, and comparing the output current corresponding values with each other to compare the output current corresponding values with each other. Cross current detectors 16 and 26 for transmitting a cross current signal corresponding to a cross current value flowing therebetween, and cross current comparators 17 and 27 for comparing the cross current signal with the cross current reference signal and transmitting a cross current comparison signal are provided. The PLL circuit 1
Phase difference detectors 18 and 28 for comparing the reference pulse sent from the reference signals 3 and 23 with the synchronization source signal from the bypass power supply and sending a phase difference signal, and inputting the cross current comparison signal and the phase difference signal. If at least one of the signals is normal, power supply control circuits 19 and 29 are provided to supply power supply control drive circuits 11 and 21 with power supply control signals for keeping the power supply control switches 12 and 22 conductive.
【００１５】そして、本発明は、横流比較信号が正常で
あるかどうかを判定する過程と、位相差信号が正常であ
るかどうかを判定する過程とを前記給電制御回路１９，
２９に設け、横流比較信号が異常であると判定された場
合に位相差信号が異常であれば前記給電制御スイッチ１
２，２２を遮断させる給電制御信号を給電制御駆動回路
１１，２１に送出する機能を有している。According to the present invention, the step of determining whether the cross current comparison signal is normal and the step of determining whether the phase difference signal is normal are performed by the power supply control circuit 19,
29, if the phase difference signal is abnormal when it is determined that the cross current comparison signal is abnormal, the power supply control switch 1
It has a function of sending a power supply control signal for shutting off the power supply control circuits 2 and 22 to the power supply control drive circuits 11 and 21.
【００１６】さらに、本発明は、横流比較信号が異常で
あり、位相差信号が異常であると判定されて前記給電制
御スイッチ１２，２２を遮断させる給電制御信号を給電
制御駆動回路１１，２１に送出してから一定時間経過後
再び位相差信号が正常であるかどうかを判定する過程を
前記給電制御回路１９，２９に設け、この位相差信号が
正常であれば前記給電制御スイッチ１２，２２を導通さ
せる給電制御信号を給電制御駆動回路１１，２１に送出
する機能を有している。Further, according to the present invention, it is determined that the cross current comparison signal is abnormal and the phase difference signal is abnormal, and the power supply control signals for shutting off the power supply control switches 12 and 22 are supplied to the power supply control drive circuits 11 and 21. The power supply control circuits 19 and 29 are provided with a process of determining whether or not the phase difference signal is normal after a lapse of a predetermined time from the transmission, and if the phase difference signal is normal, the power supply control switches 12 and 22 are turned off. It has a function of sending a power supply control signal for conducting to the power supply control drive circuits 11 and 21.
【００１７】上記した実施の形態では、給電制御回路１
９，２９によって最初に横流比較信号が正常であるかど
うかを判定し、次に位相差信号が正常であるかどうかを
判定していたが、給電制御回路１９，２９によって最初
に位相差信号が正常であるかどうかを判定し、次に横流
比較信号が正常であるかどうかを判定し、位相差信号が
異常であると判定された場合に横流比較信号が異常であ
れば前記給電制御スイッチ１２，２２を遮断させる給電
制御信号を給電制御駆動回路１１，２１に送出する機能
を有するようにしてもよい。In the above embodiment, the power supply control circuit 1
First, whether or not the cross current comparison signal is normal is determined by 9 and 29, and then whether or not the phase difference signal is normal is determined. It is determined whether the cross current comparison signal is normal, and then whether the cross current comparison signal is normal. If the cross current comparison signal is abnormal when it is determined that the phase difference signal is abnormal, the power supply control switch 12 , 22 may be transmitted to the power supply control drive circuits 11 and 21.
【００１８】そして、この場合には、位相差信号が異常
であり、横流比較信号が異常であると判定されて前記給
電制御スイッチ１２，２２を遮断させる給電制御信号を
給電制御駆動回路１１，２１に送出してから一定時間経
過後再び横流比較信号が正常であるかどうかを判定する
過程を前記給電制御回路１９，２９に設け、この横流比
較信号が正常であれば前記給電制御スイッチ１２，２２
を導通させる給電制御信号を給電制御駆動回路１１，２
１に送出する機能になることは言うまでもない。In this case, it is determined that the phase difference signal is abnormal and the cross current comparison signal is abnormal, and the power supply control signals for shutting off the power supply control switches 12 and 22 are supplied to the power supply control drive circuits 11 and 21. The power supply control circuits 19 and 29 are provided with a step of judging whether or not the cross current comparison signal is normal after a lapse of a predetermined time from the transmission control signal is transmitted to the power supply control switches 12 and 22 if the cross current comparison signal is normal.
Power supply control drive circuits 11 and 12
Needless to say, this is a function of sending to 1.
【００１９】上記した給電制御回路１９，２９に設けら
れた各機能はハード回路であってもソフトウェアであっ
ても実現することができる。Each of the functions provided in the power supply control circuits 19 and 29 can be realized by a hardware circuit or software.
【００２０】[0020]
【発明の効果】上記したとおりであるから、本発明のイ
ンバータの並列運転装置は、インバータの位相制御が外
乱によって過渡的に変化し、それによって過渡的な横流
が流れて一旦給電制御スイッチ１２または２２を遮断し
ても、一定時間経過後再び横流比較信号が正常であるか
どうかと位相差信号が正常であるかどうかを判定して異
常がなければ遮断した給電制御スイッチ１２または２２
を導通させるようにしているから、外乱によって給電制
御スイッチ１２または２２が遮断されたかインバータの
故障等によって給電制御スイッチ１２または２２が遮断
されたかの判断ができ、その信頼性を向上させることが
できる。As described above, in the inverter parallel operation device according to the present invention, the inverter phase control changes transiently due to disturbance, whereby a transient cross current flows and the power supply control switch 12 or Even if the power supply control switch 12 or 22 is turned off, it is determined whether or not the cross current comparison signal is normal and the phase difference signal is normal after a lapse of a predetermined time.
Is made conductive, it is possible to determine whether the power supply control switch 12 or 22 has been interrupted due to a disturbance or whether the power supply control switch 12 or 22 has been interrupted due to an inverter failure or the like, and the reliability thereof can be improved.
【図１】本発明のインバータの並列運転装置のブロック
図である。FIG. 1 is a block diagram of a parallel operation device of an inverter according to the present invention.
【図２】従来のインバータの並列運転装置のブロック図
である。FIG. 2 is a block diagram of a conventional parallel operation device for inverters.
１ ，２ インバータ １０，２０ 出力電流検出器 １１，２１ 給電制御駆動回路 １２，２２ 給電制御スイッチ １３，２３ ＰＬＬ回路 １４，２４ 正弦波発生回路 １５，２５ 波形補正回路 １６，２６ 横流検出器 １７，２７ 横流比較器 １８，２８ 位相差検出器 １９，２９ 給電制御回路 1, 2 Inverter 10, 20 Output current detector 11, 21 Power supply control drive circuit 12, 22 Power supply control switch 13, 23 PLL circuit 14, 24 Sine wave generation circuit 15, 25 Waveform correction circuit 16, 26 Cross current detector 17, 27 Cross current comparator 18, 28 Phase difference detector 19, 29 Power supply control circuit
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H02M 7/42 - 7/98 Continuation of front page (58) Field surveyed (Int.Cl. 7 , DB name) H02M 7 /42-7/98
Claims (5)
イッチを介して並列接続されてなるインバータの並列運
転装置において、各インバータの出力電流を検出して出
力電流対応値を出力する出力電流検出器と、この出力電
流対応値を相互に比較して各インバータ間に流れる横流
値に対応する横流信号を送出する横流検出器と、この横
流信号と横流基準信号とを比較して横流比較信号を送出
する横流比較器とを設け、かつ各インバータの同期元信
号に対応した基準パルスを作成するＰＬＬ回路と、この
基準パルスと同期元信号とを比較して位相差信号を送出
する位相差検出器とを設け、前記基準パルスに対応した
正弦波を正弦波発生回路によって作成し、この正弦波に
基づいて各インバータの電圧波形歪を波形補正回路によ
って補正するとともに、前記横流比較信号と前記位相差
信号とを入力し、各信号の少なくとも一方が正常であれ
ば前記給電制御スイッチの導通を継続させる給電制御信
号を送出する給電制御回路を設けたことを特徴とするイ
ンバータの並列運転装置。In an inverter parallel operation device in which a plurality of inverters are connected in parallel via a power supply control switch, an output current detector for detecting an output current of each inverter and outputting an output current corresponding value. And a cross current detector for comparing the output current corresponding values with each other to transmit a cross current signal corresponding to a cross current value flowing between the inverters, and comparing the cross current signal with the cross current reference signal to transmit a cross current comparison signal. A PLL circuit for generating a reference pulse corresponding to the synchronization source signal of each inverter, and a phase difference detector for comparing the reference pulse with the synchronization source signal and transmitting a phase difference signal. A sine wave corresponding to the reference pulse is created by a sine wave generation circuit, and the voltage waveform distortion of each inverter is corrected by a waveform correction circuit based on the sine wave. A power supply control circuit for inputting the cross current comparison signal and the phase difference signal and transmitting a power supply control signal for continuing conduction of the power supply control switch if at least one of the signals is normal. Inverter parallel operation device.
置において、給電制御回路は、横流比較信号が正常であ
るかどうかを判定する過程と、位相差信号が正常である
かどうかを判定する過程とを有し、横流比較信号が異常
であると判定された場合に位相差信号が異常であれば給
電制御スイッチを遮断させる給電制御信号を送出する機
能を有することを特徴とするインバータの並列運転装
置。2. The parallel operation device for an inverter according to claim 1, wherein the power supply control circuit determines whether the cross current comparison signal is normal and determines whether the phase difference signal is normal. And a function of transmitting a power supply control signal for shutting off a power supply control switch when the phase difference signal is abnormal when it is determined that the cross current comparison signal is abnormal. apparatus.
置において、給電制御回路は、横流比較信号が異常であ
り、位相差信号が異常であると判定されて給電制御スイ
ッチを遮断させる給電制御信号を送出してから一定時間
経過後再び位相差信号が正常であるかどうかを判定する
過程を有し、この位相差信号が正常であれば前記給電制
御スイッチを導通させる給電制御信号を送出する機能を
有することを特徴とするインバータの並列運転装置。3. The power supply control circuit according to claim 2, wherein the power supply control circuit cuts off the power supply control switch when it is determined that the cross current comparison signal is abnormal and the phase difference signal is abnormal. A step of determining whether or not the phase difference signal is normal after a lapse of a predetermined time from the transmission of the power supply control signal, and transmitting a power supply control signal for turning on the power supply control switch if the phase difference signal is normal. A parallel operation device for an inverter, comprising:
置において、給電制御回路は、位相差信号が正常である
かどうかを判定する過程と、横流比較信号が正常である
かどうかを判定する過程とを有し、位相差信号が異常で
あると判定された場合に横流比較信号が異常であれば給
電制御スイッチを遮断させる給電制御信号を送出する機
能を有することを特徴とするインバータの並列運転装
置。4. The parallel operation device for an inverter according to claim 1, wherein the power supply control circuit determines whether the phase difference signal is normal and determines whether the cross current comparison signal is normal. And a function of transmitting a power supply control signal for shutting off a power supply control switch when the cross current comparison signal is abnormal when it is determined that the phase difference signal is abnormal. apparatus.
置において、給電制御回路は、位相差信号が異常であ
り、横流比較信号が異常であると判定されて給電制御ス
イッチを遮断させる給電制御信号を送出してから一定時
間経過後再び横流比較信号が正常であるかどうかを判定
する過程を有し、この横流比較信号が正常であれば前記
給電制御スイッチを導通させる給電制御信号を送出する
機能を有することを特徴とするインバータの並列運転装
置。5. The power supply control circuit according to claim 4, wherein the power supply control circuit cuts off the power supply control switch when it is determined that the phase difference signal is abnormal and the cross current comparison signal is abnormal. A step of determining whether or not the cross current comparison signal is normal after a lapse of a predetermined time from the transmission of the power supply control signal. A parallel operation device for an inverter, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29678195A JP3268181B2 (en) | 1995-11-15 | 1995-11-15 | Inverter parallel operation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29678195A JP3268181B2 (en) | 1995-11-15 | 1995-11-15 | Inverter parallel operation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09140148A JPH09140148A (en) | 1997-05-27 |
| JP3268181B2 true JP3268181B2 (en) | 2002-03-25 |
Family
ID=17838058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29678195A Expired - Fee Related JP3268181B2 (en) | 1995-11-15 | 1995-11-15 | Inverter parallel operation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3268181B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7602627B2 (en) | 2005-04-28 | 2009-10-13 | Origin Electric Company, Limited. | Electrical power source, operational method of the same, inverter and operational method of the same |
| JP4748052B2 (en) * | 2006-12-22 | 2011-08-17 | 東芝三菱電機産業システム株式会社 | AC output converter parallel operation controller |
| JP6202896B2 (en) * | 2013-06-19 | 2017-09-27 | 三菱電機株式会社 | Power converter |
| JP6690071B1 (en) * | 2019-09-13 | 2020-04-28 | 株式会社電菱 | Parallel inverter device |
-
1995
- 1995-11-15 JP JP29678195A patent/JP3268181B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09140148A (en) | 1997-05-27 |
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