JP4309789B2 - Uninterruptible power supply system - Google Patents

Uninterruptible power supply system Download PDF

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JP4309789B2
JP4309789B2 JP2004074800A JP2004074800A JP4309789B2 JP 4309789 B2 JP4309789 B2 JP 4309789B2 JP 2004074800 A JP2004074800 A JP 2004074800A JP 2004074800 A JP2004074800 A JP 2004074800A JP 4309789 B2 JP4309789 B2 JP 4309789B2
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power supply
bypass
inverter
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uninterruptible power
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川 公 也 小
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Toshiba Corp
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Description

本発明は、直流を交流に変換するインバータ電源と商用電源等のバイパス電源とを切り換えて電力を供給する複数の無停電電源系統を、さらに切り換えて電力を供給する無停電電源システムに関する。   The present invention relates to an uninterruptible power supply system that further switches a plurality of uninterruptible power supply systems that supply power by switching between an inverter power supply that converts direct current to alternating current and a bypass power supply such as a commercial power supply.

商用電源等のバイパス電源と、少なくとも直流を交流に変換するインバータ電源とが正常な同期がとれていない非同期の状態でも負荷電圧に変動を与えることなく両電源間の切換を可能にする電力変換装置が提案されている（例えば、特許文献１参照。）。また、同期制御されるインバータの周波数が大きく変化する場合に生ずる直流分を減少させ、出力トランスの飽和を防止するインバータの同期制御回路も提案されている（例えば、特許文献２参照。）。   A power converter capable of switching between both power sources without fluctuations in the load voltage even when the bypass power source such as a commercial power source and at least the inverter power source that converts direct current to alternating current are not normally synchronized asynchronously Has been proposed (see, for example, Patent Document 1). There has also been proposed an inverter synchronous control circuit that reduces the DC component that occurs when the frequency of an inverter that is synchronously controlled changes greatly and prevents saturation of the output transformer (see, for example, Patent Document 2).

図４はこれらの技術を適用しているか、又は、適用することが可能な複数組の無停電電源系統を備えた従来の無停電電源システムの概略構成を示す系統図である。同図において、一般にＵＰＳと称される無停電電源系統１，２…はそれぞれバイパス電源とインバータ電源とを含んで構成され、このうち、無停電電源系統１の出力が開閉器３１〜３ｎを介して負荷（図示せず）に供給され、無停電電源系統２の出力が開閉器４１〜４ｎを介して負荷に供給される。   FIG. 4 is a system diagram showing a schematic configuration of a conventional uninterruptible power supply system including a plurality of uninterruptible power supply systems to which these techniques are applied or can be applied. In the figure, uninterruptible power supply systems 1, 2 and so on generally referred to as UPS are configured to include a bypass power supply and an inverter power supply, respectively. Among these, the output of the uninterruptible power supply system 1 passes through switches 31 to 3n. Is supplied to a load (not shown), and the output of the uninterruptible power supply system 2 is supplied to the load via the switches 41 to 4n.

無停電電源系統１はバイパス電源１０とインバータ電源１１〜１４とを相互に切換可能な第１の切換装置としての切換盤１５を備え、同様に、無停電電源系統２はバイパス電源２０とインバータ電源２１〜２４とを相互に切換可能な第１の切換装置としての切換盤２５を備えている。インバータ電源１１〜１４，２１〜２４はそれぞれ商用電源又は自家発電源の電圧を降圧する変圧器、この変圧器の出力を直流に変換するコンバータ、このコンバータの出力または図示を省略した直流電源の出力を交流に変換するインバータ及びその出力波形を整形する機能を備える変圧器を含んで構成されている。   The uninterruptible power supply system 1 includes a switching board 15 as a first switching device that can switch between the bypass power supply 10 and the inverter power supplies 11 to 14, and similarly, the uninterruptible power supply system 2 includes a bypass power supply 20 and an inverter power supply. A switching board 25 is provided as a first switching device capable of switching between 21-24. The inverter power supplies 11 to 14 and 21 to 24 are respectively a transformer for stepping down the voltage of the commercial power source or the self-generated power source, a converter for converting the output of the transformer into direct current, the output of the converter or the output of the direct current power source not shown. Is configured to include an inverter that converts AC into AC and a transformer having a function of shaping its output waveform.

切換盤１５はインバータ電源１１〜１４から負荷の大きさに適した容量を持つものを１つ又は複数選択して負荷に供給し、必要に応じてバイパス電源１０に切り換える。また、切換盤２５はインバータ電源２１〜２４から負荷の大きさに適した容量を持つものを１つ又は複数選択して負荷に供給する。   The switching board 15 selects one or a plurality of inverter power supplies 11 to 14 having a capacity suitable for the size of the load, supplies the load, and switches to the bypass power supply 10 as necessary. Further, the switching board 25 selects one or a plurality of inverter power supplies 21 to 24 having a capacity suitable for the size of the load, and supplies the selected load to the load.

双方向瞬時切換装置５１は第２切換装置として設けられ、１つの負荷に対して、無停電電源系統１と無停電電源系統２とを切り換えて、連続的に電力を供給しようとするもので、開閉器３１を介して無停電電源系統１に接続されると共に、開閉器４１を介して無停電電源系統２に接続されている。   The bidirectional instantaneous switching device 51 is provided as a second switching device, and switches between the uninterruptible power supply system 1 and the uninterruptible power supply system 2 for one load to continuously supply power. The switch is connected to the uninterruptible power supply system 1 through the switch 31 and is connected to the uninterruptible power supply system 2 through the switch 41.

また、無停電電源系統（以下、Ａ系ともいう）１はインバータ電源１１〜１４の出力をバイパス電源１０に同期させる同期制御装置を備え、同じく無停電電源系統（以下、Ｂ系ともいう）２はインバータ電源２１〜２４の出力をバイパス電源２０に同期させる同期制御装置を備えている。図５はその概略構成を示した図で、無停電電源系統１は、バイパス電源１０とインバータ電源１１とを、切換スイッチ１５ａ及び半導体スイッチ１５ｂを介して相互に切り換える場合に、電源変動や故障を防止するための同期制御装置３０を備え、さらに、無停電電源系統２は、バイパス電源２０とインバータ電源２１とを、切換スイッチ２５ａ及び半導体スイッチ２５ｂを介して相互に切り換える場合に、電源変動や故障を防止するための同期制御装置４０を備えている。   The uninterruptible power supply system (hereinafter also referred to as “A system”) 1 includes a synchronous control device that synchronizes the outputs of the inverter power supplies 11 to 14 with the bypass power supply 10, and the uninterruptible power supply system (hereinafter also referred to as “B system”) 2. Includes a synchronous control device that synchronizes the outputs of the inverter power supplies 21 to 24 with the bypass power supply 20. FIG. 5 shows a schematic configuration of the uninterruptible power supply system 1. When the uninterruptible power supply system 10 and the inverter power supply 11 are switched to each other via the changeover switch 15a and the semiconductor switch 15b, power supply fluctuations and failures are detected. In addition, the uninterruptible power supply system 2 includes a power supply fluctuation and failure when the bypass power supply 20 and the inverter power supply 21 are switched to each other via the changeover switch 25a and the semiconductor switch 25b. A synchronization control device 40 is provided.

図６はＡ系の同期制御装置３０の制御動作と、Ｂ系の同期制御装置４０の各種の制御動作を説明するための図表である。ここで、Ａ系のバイパス電源１０及びＢ系のバイパス電源２０の両方が健全であれば、Ａ系においてはバイパス電源１０に同期するようにインバータ電源１１〜１４の位相を制御し、Ｂ系においてはバイパス電源２０に同期するようにインバータ電源２１〜２４の位相を制御する。次に、Ａ系のバイパス電源が喪失し、Ｂ系のバイパス電源が健全である場合、Ａ系においては自走モードの出力電圧基準に同期するようにインバータ電源１１〜１４の位相を制御し、Ｂ系においてはバイパス電源２０に同期するようにインバータ電源２１〜２４の位相を制御する。次に、Ａ系のバイパス電源１０が健全で、Ｂ系のバイパス電源が喪失した場合、Ａ系においてはバイパス電源１０に同期するようにインバータ電源１１〜１４の位相を制御し、Ｂ系においては自走モードの出力電圧基準に同期するようにインバータ電源２１〜２４の位相を制御する。最後に、Ａ系のバイパス電源１０及びＢ系のバイパス電源２０の両方が喪失した場合、Ａ系もＢ系もそれぞれ自走モードの電圧基準に同期するようにインバータ電源１１〜１４やインバータ電源２１〜２４の位相を制御する。
特開２０００−１４０４１号公報 実開平６−５７０９７号公報 FIG. 6 is a chart for explaining the control operation of the A-system synchronization control device 30 and various control operations of the B-system synchronization control device 40. Here, if both the A-system bypass power supply 10 and the B-system bypass power supply 20 are healthy, the phase of the inverter power supplies 11 to 14 is controlled so as to be synchronized with the bypass power supply 10 in the A system. Controls the phases of the inverter power supplies 21 to 24 so as to be synchronized with the bypass power supply 20. Next, when the A-system bypass power supply is lost and the B-system bypass power supply is healthy, in the A system, the phases of the inverter power supplies 11 to 14 are controlled so as to be synchronized with the output voltage reference in the self-running mode, In the B system, the phases of the inverter power supplies 21 to 24 are controlled so as to be synchronized with the bypass power supply 20. Next, when the A-system bypass power supply 10 is healthy and the B-system bypass power supply is lost, the phase of the inverter power supplies 11 to 14 is controlled to be synchronized with the bypass power supply 10 in the A-system, The phases of the inverter power supplies 21 to 24 are controlled so as to be synchronized with the output voltage reference in the free-running mode. Finally, when both the A-system bypass power supply 10 and the B-system bypass power supply 20 are lost, the inverter power supplies 11 to 14 and the inverter power supply 21 are synchronized so that both the A system and the B system are synchronized with the voltage reference in the free-running mode. Control the phase of ~ 24.
JP 2000-14041 A Japanese Utility Model Publication No. 6-57097

上述した従来の無停電電源システムにおいては、無停電電源系統１がバイパス電源１０又は自走モードの出力電圧基準に同期するようにインバータ電源１１〜１４の位相を制御し、無停電電源系統２がバイパス電源２０又は自走モードの出力電圧基準に同期するようにインバータ電源２１〜２４の位相を制御していることから、無停電電源系統１の出力と無停電電源系統２の出力とが非同期になることがあり得る。従って、双方向瞬時切換装置５１を介して、無停電電源系統１と無停電電源系統２とで負荷に対する給電切換を行った場合、横流によってインバータ電源が故障したり、負荷に対して電源変動を生じたりするため全体のシステムの信頼性が低下してしまうという問題があった。   In the conventional uninterruptible power supply system described above, the phase of the inverter power supplies 11 to 14 is controlled so that the uninterruptible power supply system 1 is synchronized with the bypass power supply 10 or the output voltage reference in the self-running mode. Since the phases of the inverter power supplies 21 to 24 are controlled to be synchronized with the bypass power supply 20 or the output voltage reference in the self-running mode, the output of the uninterruptible power supply system 1 and the output of the uninterruptible power supply system 2 are asynchronous. Can be. Accordingly, when the uninterruptible power supply system 1 and the uninterruptible power supply system 2 perform power supply switching to the load via the bidirectional instantaneous switching device 51, the inverter power supply breaks down due to the cross current or the power supply fluctuations to the load. As a result, the reliability of the entire system is lowered.

本発明は、上記の問題点を解決するためになされたもので、その目的はインバータ電源の故障を未然に防止すると共に、負荷に対する電源変動を防止することにより、システムの信頼性を高めることのできる無停電電源システムを提供することにある。   The present invention has been made to solve the above-mentioned problems, and its purpose is to prevent failure of the inverter power supply and to improve system reliability by preventing power supply fluctuations with respect to the load. The object is to provide an uninterruptible power supply system.

上記の目的を達成するために、請求項１に係る発明は、直流を交流に変換するインバータ電源と商用電源等のバイパス電源とをそれぞれ第１の切換装置によって切り換えて電力を出力するＡ系及びＢ系の２つの無停電電源系統を有し、これらＡ系及びＢ系の無停電電源系統からの出力を第２の切換装置によって切り換えて負荷に電力を供給する無停電電源システムにおいて、前記Ａ系及びＢ系の各無停電電源系統は、自系及び他系のバイパス電源並びに他系出力端子にそれぞれ接続された同期制御装置を備えており、各同期制御装置は、両系のバイパス電源が健全な場合には、Ａ系のバイパス電源に同期するように、自系のインバータ電源の位相を制御し、Ａ系のバイパス電源が喪失した場合には、Ｂ系のバイパス電源に同期するように、自系のインバータ電源の位相を制御し、Ｂ系のバイパス電源が喪失した場合には、Ａ系のバイパス電源に同期するように、自系のインバータ電源の位相を制御を行うものであり、更に、両系のバイパス電源が喪失した場合、Ａ系の同期制御装置は、自走モードの電圧基準に同期するように、自系のインバータ電源の位相を制御し、Ｂ系の同期制御装置は、Ａ系のインバータ電源に同期するように、自系のインバータ電源の位相を制御するものである、ことを特徴とする。   In order to achieve the above object, the invention according to claim 1 is directed to an A system that outputs power by switching between an inverter power source that converts direct current to alternating current and a bypass power source such as a commercial power source by a first switching device. In the uninterruptible power supply system, which has two uninterruptible power supply systems of the B system, and supplies power to the load by switching the outputs from the A and B uninterruptible power supply systems by a second switching device. Each uninterruptible power supply system of system B and system B is provided with a synchronous control device connected to its own system and other system bypass power sources and other system output terminals, respectively. In the case of soundness, the phase of the inverter power supply of the own system is controlled so as to synchronize with the A system bypass power supply, and when the A system bypass power supply is lost, it is synchronized with the B system bypass power supply. The The phase of the inverter power supply is controlled, and when the B system bypass power supply is lost, the phase of the inverter power supply of the own system is controlled so as to synchronize with the A system bypass power supply. When the system bypass power supply is lost, the A system synchronous control device controls the phase of the inverter power supply of the own system so as to synchronize with the voltage reference of the self-running mode, and the B system synchronous control device The phase of the inverter power supply of the own system is controlled so as to be synchronized with the inverter power supply of the system.

本発明は上記のように構成したことにより、インバータ電源の故障を未然に防止すると共に、負荷に対する電源変動を防止することにより、システムの信頼性を高めることのできる無停電電源システムが提供される。   The present invention is configured as described above, thereby providing an uninterruptible power supply system that can prevent failure of the inverter power supply and also can prevent the fluctuation of the power supply with respect to the load, thereby improving the reliability of the system. .

以下、本発明を図面に示す好適な実施例に基づいて詳細に説明する。   Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the drawings.

図１は本発明に係る無停電電源システムの第１実施例の概略構成を示す系統図であり、図中、従来の無停電電源システムを示す図４と同一の要素には同一の符号を付してその説明を省略する。本実施例は、例えば、無停電電源系統１のバイパス電源１０及び無停電電源系統２のバイパス電源２０の両方が共に健全であるとき、無停電電源系統１のインバータ電源１１〜１４をバイパス電源１０に同期させると共に、無停電電源系統２においてインバータ電源２１〜２４から電力を給電したとすれば、これらのインバータ電源２１〜２４をバイパス電源１０に同期させるように制御する。ここで、無停電電源系統２がバイパス電源２０から給電していたとすれば、インバータ電源２１〜２４をバイパス電源２０に同期させると共に、無停電電源系統１においてもインバータ電源１１〜１４をバイパス電源２０に同期させるように制御する。これによって、双方向瞬時切換装置５１によって無停電電源系統１及び無停電電源系統２の相互間で給電切換を行ったとしても、インバータ電源の故障や負荷に対する電源変動を防止することができる。   FIG. 1 is a system diagram showing a schematic configuration of a first embodiment of an uninterruptible power supply system according to the present invention, in which the same elements as those in FIG. 4 showing a conventional uninterruptible power supply system are denoted by the same reference numerals. Therefore, the description is omitted. In the present embodiment, for example, when both the bypass power supply 10 of the uninterruptible power supply system 1 and the bypass power supply 20 of the uninterruptible power supply system 2 are healthy, the inverter power supplies 11 to 14 of the uninterruptible power supply system 1 are connected to the bypass power supply 10. If the power is supplied from the inverter power sources 21 to 24 in the uninterruptible power supply system 2, the inverter power sources 21 to 24 are controlled to be synchronized with the bypass power source 10. Here, if the uninterruptible power supply system 2 is fed from the bypass power supply 20, the inverter power supplies 21 to 24 are synchronized with the bypass power supply 20, and the inverter power supplies 11 to 14 are also connected to the bypass power supply 20 in the uninterruptible power supply system 1. Control to synchronize with. As a result, even if power supply switching is performed between the uninterruptible power supply system 1 and the uninterruptible power supply system 2 by the bidirectional instantaneous switching device 51, it is possible to prevent a failure of the inverter power supply or a power supply fluctuation with respect to the load.

なお、無停電電源系統１のインバータ電源１１〜１４及び無停電電源系統２のインバータ電源２１〜２４の全てをバイパス電源１０に同期させている状態で、バイパス電源１０を停電させる必要性が発生した場合、インバータ電源１１〜１４及び２１〜２４の全てをバイパス電源２０に同期させる制御を実行した後、インバータ電源１１〜１４及びバイパス電源１０の相互切換や、インバータ電源２１〜２４及びバイパス電源２０の相互切換を実行する。   In addition, in the state where all of the inverter power supplies 11 to 14 of the uninterruptible power supply system 1 and the inverter power supplies 21 to 24 of the uninterruptible power supply system 2 are synchronized with the bypass power supply 10, it is necessary to cause a power failure of the bypass power supply 10. In this case, after executing the control to synchronize all of the inverter power supplies 11 to 14 and 21 to 24 with the bypass power supply 20, the inverter power supplies 11 to 14 and the bypass power supply 10 are mutually switched, and the inverter power supplies 21 to 24 and the bypass power supply 20 are switched. Perform mutual switching.

図２はこれらの同期制御を実施する制御系統の概略構成図であり、図中、従来装置を示す図５と同一の要素には同一の符号を付してその説明を省略する。ここでは図５中の同期制御装置３０，４０に代えて同期制御装置３０Ａ，４０Ａを備えている。このうち、無停電電源系統１（Ａ系）の同期制御装置３０Ａはバイパス電源１０、２０及び無停電電源系統２（Ｂ系）の出力端子にそれぞれ接続され、無停電電源系統２（Ｂ系）の同期制御装置４０Ａはバイパス電源２０、１０及び無停電電源系統１（Ａ系）の出力端子にそれぞれ接続されている。   FIG. 2 is a schematic configuration diagram of a control system for performing these synchronous controls. In FIG. 2, the same elements as those in FIG. Here, synchronous control devices 30A and 40A are provided instead of the synchronous control devices 30 and 40 in FIG. Among these, the synchronous control device 30A of the uninterruptible power supply system 1 (A system) is connected to the output terminals of the bypass power supplies 10 and 20 and the uninterruptible power supply system 2 (B system), respectively, and the uninterruptible power supply system 2 (B system). Are connected to the output terminals of the bypass power supplies 20 and 10 and the uninterruptible power supply system 1 (A system).

上記のように構成された同期制御装置３０Ａ及び４０Ａの動作について、図３の図表をも参照して以下に説明する。先ず、Ａ系のバイパス電源１０及びＢ系のバイパス電源２０の両方が健全であれば、Ａ系においてはバイパス電源１０に同期するようにインバータ電源１１〜１４の位相を制御し、Ｂ系においてもバイパス電源１０に同期するようにインバータ電源２１〜２４の位相を制御する。次に、Ａ系のバイパス電源が喪失し、Ｂ系のバイパス電源が健全である場合、Ａ系においてはＢ系のバイパス電源２０に同期するようにインバータ電源１１〜１４の位相を制御し、Ｂ系においてはバイパス電源２０に同期するようにインバータ電源２１〜２４の位相を制御する。次に、Ａ系のバイパス電源１０が健全で、Ｂ系のバイパス電源が喪失した場合、Ａ系においてはバイパス電源１０に同期するようにインバータ電源１１〜１４の位相を制御し、Ｂ系においてもバイパス電源１０に同期するようにインバータ電源２１〜２４の位相を制御する。最後に、Ａ系のバイパス電源１０及びＢ系のバイパス電源２０の両方が喪失した場合、例えばＡ系を自走モードの電圧基準に同期するようにインバータ電源１１〜１４を制御し、Ｂ系においてはＡ系のインバータ電源１１〜１４に同期するようにインバータ電源２１〜２４の位相を制御する。   The operation of the synchronization control devices 30A and 40A configured as described above will be described below with reference to the chart of FIG. First, if both the A-system bypass power supply 10 and the B-system bypass power supply 20 are healthy, the phase of the inverter power supplies 11 to 14 is controlled so as to be synchronized with the bypass power supply 10 in the A-system. The phases of the inverter power supplies 21 to 24 are controlled so as to be synchronized with the bypass power supply 10. Next, when the A-system bypass power supply is lost and the B-system bypass power supply is healthy, the phase of the inverter power supplies 11 to 14 is controlled to synchronize with the B-system bypass power supply 20 in the A-system. In the system, the phases of the inverter power supplies 21 to 24 are controlled so as to be synchronized with the bypass power supply 20. Next, when the A-system bypass power supply 10 is healthy and the B-system bypass power supply is lost, the phase of the inverter power supplies 11 to 14 is controlled to synchronize with the bypass power supply 10 in the A-system. The phases of the inverter power supplies 21 to 24 are controlled so as to be synchronized with the bypass power supply 10. Finally, when both the A-system bypass power supply 10 and the B-system bypass power supply 20 are lost, for example, the inverter power supplies 11 to 14 are controlled to synchronize the A system with the voltage reference in the free-running mode. Controls the phases of the inverter power supplies 21 to 24 so as to be synchronized with the A-system inverter power supplies 11 to 14.

かくして、第１実施例によれば、双方向瞬時切換装置５１によって無停電電源系統１及び無停電電源系統２の相互間で給電切換を行ったとしても、インバータ電源の故障や負荷に対する電源変動を防止することができる。   Thus, according to the first embodiment, even if the power supply switching is performed between the uninterruptible power supply system 1 and the uninterruptible power supply system 2 by the bidirectional instantaneous switching device 51, the inverter power supply failure or the power supply fluctuation with respect to the load is prevented. Can be prevented.

上述した第１実施例によれば、バイパス電源１０及び２０の両方が健全である場合、あるいは、両方が喪失した場合にそれぞれＡ系を基準にしてＢ系のインバータ電源の位相を制御したが、この代わりにＢ系を基準してＡ系のインバータ電源の位相を制御するように、すなわち、マスタ側とスレーブ側とを逆にしても上述したと同様な効果が得られる。   According to the first embodiment described above, when both bypass power supplies 10 and 20 are healthy, or when both are lost, the phase of the B-system inverter power supply is controlled based on the A-system. Instead, the same effect as described above can be obtained by controlling the phase of the A-system inverter power supply with reference to the B-system, that is, by reversing the master side and the slave side.

本発明に係る無停電電源システムの第１実施例の概略構成を示す系統図。The systematic diagram which shows schematic structure of 1st Example of the uninterruptible power supply system which concerns on this invention. 第１実施例の制御系統の概略構成図。The schematic block diagram of the control system of 1st Example. 第１実施例を構成する同期制御装置の各種の制御動作を説明するための図表。The figure for demonstrating the various control operation | movement of the synchronous control apparatus which comprises 1st Example. 従来の無停電電源システムの概略構成を示す系統図。The system diagram which shows schematic structure of the conventional uninterruptible power supply system. 従来の無停電電源システムの制御系統の概略構成図。The schematic block diagram of the control system of the conventional uninterruptible power supply system. 従来の無停電電源システムを構成する同期制御装置の各種の制御動作を説明するための図表。The figure for demonstrating the various control operation | movement of the synchronous control apparatus which comprises the conventional uninterruptible power supply system.

符号の説明Explanation of symbols

１，２ 無停電電源系統
１０，２０ バイパス電源
１１〜１４，２１〜２４ インバータ電源
１５，２５ 切換盤
３０Ａ，４０Ｂ 同期制御装置
５１ 双方向瞬時切換装置 1, 2 Uninterruptible power supply system 10, 20 Bypass power supply 11-14, 21-24 Inverter power supply 15, 25 Switching panel 30A, 40B Synchronous control device 51 Bidirectional instantaneous switching device

Claims (1)

直流を交流に変換するインバータ電源と商用電源等のバイパス電源とをそれぞれ第１の切換装置によって切り換えて電力を出力するＡ系及びＢ系の２つの無停電電源系統を有し、これらＡ系及びＢ系の無停電電源系統からの出力を第２の切換装置によって切り換えて負荷に電力を供給する無停電電源システムにおいて、
前記Ａ系及びＢ系の各無停電電源系統は、自系及び他系のバイパス電源並びに他系出力端子にそれぞれ接続された同期制御装置を備えており、
各同期制御装置は、
両系のバイパス電源が健全な場合には、Ａ系のバイパス電源に同期するように、自系のインバータ電源の位相を制御し、
Ａ系のバイパス電源が喪失した場合には、Ｂ系のバイパス電源に同期するように、自系のインバータ電源の位相を制御し、
Ｂ系のバイパス電源が喪失した場合には、Ａ系のバイパス電源に同期するように、自系のインバータ電源の位相を制御を行うものであり、
更に、両系のバイパス電源が喪失した場合、Ａ系の同期制御装置は、自走モードの電圧基準に同期するように、自系のインバータ電源の位相を制御し、Ｂ系の同期制御装置は、Ａ系のインバータ電源に同期するように、自系のインバータ電源の位相を制御するものである、
ことを特徴とする無停電電源システム。 There are two uninterruptible power systems A and B that output power by switching between an inverter power source that converts direct current to alternating current and a bypass power source such as a commercial power source by a first switching device. In the uninterruptible power supply system that supplies power to the load by switching the output from the uninterruptible power supply system of the B system by the second switching device,
Each uninterruptible power supply system of the A system and the B system includes a synchronous control device connected to the own system and the bypass power supply of the other system and the other system output terminal,
Each synchronous control device
When the bypass power supply of both systems is healthy, the phase of the inverter power supply of the own system is controlled so as to be synchronized with the bypass power supply of the A system,
When the A system bypass power supply is lost, the phase of the inverter power supply of the own system is controlled so as to synchronize with the B system bypass power supply.
When the B system bypass power supply is lost, the phase of the inverter power supply of the own system is controlled so as to be synchronized with the A system bypass power supply.
Furthermore, when the bypass power supplies of both systems are lost, the A system synchronous control device controls the phase of the own system inverter power supply so as to synchronize with the voltage reference of the self-running mode, and the B system synchronous control device The phase of the inverter power supply of the own system is controlled so as to synchronize with the inverter power supply of the A system.
An uninterruptible power supply system.
JP2004074800A 2004-03-16 2004-03-16 Uninterruptible power supply system Expired - Fee Related JP4309789B2 (en)

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