JP3248111B2 - Uninterruptible power supply system - Google Patents
Uninterruptible power supply systemInfo
- Publication number
- JP3248111B2 JP3248111B2 JP28640391A JP28640391A JP3248111B2 JP 3248111 B2 JP3248111 B2 JP 3248111B2 JP 28640391 A JP28640391 A JP 28640391A JP 28640391 A JP28640391 A JP 28640391A JP 3248111 B2 JP3248111 B2 JP 3248111B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- group
- uninterruptible power
- output
- parallel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Voltage And Current In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、無停電電源システムに
かかり、具体的には複数の無停電電源装置を並列接続し
て一群を構成し（以下、無停電電源装置群又は単に群と
称する）、その無停電電源装置群を複数の独立した負荷
系に対応させて複数設けてなる無停電電源システムに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply system, and more specifically, a plurality of uninterruptible power supplies are connected in parallel to form a group (hereinafter referred to as an uninterruptible power supply group or simply a group). The present invention relates to an uninterruptible power supply system including a plurality of uninterruptible power supply groups corresponding to a plurality of independent load systems.
【０００２】[0002]
【従来の技術】従来の無停電電源システムは、電気学会
技術報告（II）第３７２号、第１３頁の３．３表に記載
のように負荷容量が大きい場合、負荷容量に合わせて複
数台の無停電電源装置を並列運転するようにしている。
また、故障等に対する信頼性を確保するため、上記複数
台の無停電電源装置に対し１台以上の冗長予備機を選択
的に並列運転可能なシステム構成が採用されている。さ
らに大容量負荷の場合や、電源又は負荷の系統的な独立
性が要求される場合は、上記システムを複数設けるシス
テム構成がとられている。2. Description of the Related Art As described in Table 3.3 on page 13 of IEEJ Technical Report (II) No. 372, page 13 of the related art uninterruptible power supply system, when the load capacity is large, a plurality of uninterruptible power supply systems are required according to the load capacity. Are operated in parallel.
Further, in order to ensure reliability against a failure or the like, a system configuration is adopted in which one or more redundant spare units can be selectively operated in parallel with respect to the plurality of uninterruptible power supplies. Further, in the case of a large capacity load, or when systematic independence of a power supply or a load is required, a system configuration in which a plurality of the above systems are provided is adopted.
【０００３】また、東芝レビュ−1991,Vol.46,No.6の４
６６頁から４６７頁に記載された無停電電源システムに
よれば、各負荷に対応させて無停電電源装置を分散して
設け、その無停電電源装置に対してそれぞれ商用バイパ
スを設け、これに対してさらに共通予備機の無停電電源
装置を設けるシステムが提案されている。[0003] Toshiba Review 1991, Vol. 46, No. 6, 4
According to the uninterruptible power supply system described on pages 66 to 467, uninterruptible power supplies are provided in a distributed manner corresponding to each load, and a commercial bypass is provided for each uninterruptible power supply. In addition, a system has been proposed in which an uninterruptible power supply as a common standby unit is further provided.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来技術
によれば、複数の無停電電源装置を並列接続してなる一
群に対して１台の冗長予備機を設け、この群を更に複数
設けるシステム構成になるから、各群が１台以上の冗長
予備機を持つことになり、その分だけ無停電電源装置の
台数が多くなる。したがって、据付けスペ−スおよび設
備コストが増大するという問題点があった。However, according to the above-mentioned prior art, one redundant spare unit is provided for a group of a plurality of uninterruptible power supply units connected in parallel, and a plurality of such groups are further provided. Because of the configuration, each group has one or more redundant spare units, and the number of uninterruptible power supplies increases accordingly. Therefore, there is a problem that the installation space and the equipment cost increase.
【０００５】この点、上記の東芝レビュ−に記載された
従来技術のように、複数の無停電電源装置に対して一台
の共通予備機を設ける考え方によれば、省スペースの効
果はある。しかし、この方式によれば、共通予備機と各
無停電電源装置は通常時に並列運転していないことか
ら、共通予備機をいざ並列運転しようとするとき、一旦
商用バイパスにて運転し、その後共通予備機を並列投入
する手順になるものと解される。したがって、商用電源
バイパスを具備したシステムにしか適用できない。ま
た、共通予備機を並列運転に切り換えるには、一般に共
通予備機の位相を他の無停電電源装置の位相に一致させ
る必要がある。この点、本従来技術では同一位相の商用
電源バイパス方式であるから問題ないが、商用電源パイ
パスを具備していないシステムの場合は並入時の同期制
御などを含む並列運転移行が円滑に行かないという問題
が考えられる。また、商用電源バイパス方式のシステム
に限られるとなると、例えば商用電源と無停電電源装置
の周波数が異なる場合に使用できないという問題点もあ
る。[0005] In this respect, according to the concept of providing one common standby device for a plurality of uninterruptible power supplies as in the prior art described in the above-mentioned Toshiba review, there is an effect of saving space. However, according to this method, since the common standby unit and each uninterruptible power supply do not operate in parallel at normal times, when the common standby unit is to be operated in parallel, the common standby unit is once operated by the commercial bypass and then It is understood that this is the procedure for putting the spare machines in parallel. Therefore, it can be applied only to a system having a commercial power supply bypass. Further, in order to switch the common standby unit to the parallel operation, it is generally necessary to match the phase of the common standby unit with the phase of another uninterruptible power supply. In this regard, in the prior art, there is no problem because the commercial power supply bypass system has the same phase, but in the case of a system that does not have the commercial power supply bypass, the transition to parallel operation including synchronization control at the time of parallel insertion does not go smoothly. The problem is considered. In addition, if the system is limited to the commercial power supply bypass system, for example, there is also a problem that the commercial power supply and the uninterruptible power supply cannot be used when their frequencies are different.
【０００６】本発明の目的は、上記問題点を解決するこ
とにあり、複数の無停電電源装置群に対して一台の予備
機を設けた無停電電源システムにおいて、商用電源バイ
パス系の有無に拘らず各群に対する予備機並列投入を円
滑に行うことができ、かつ各群の独立性を保持できる無
停電電源システムを提供する。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. In an uninterruptible power supply system in which one standby unit is provided for a plurality of uninterruptible power supply groups, the presence or absence of a commercial power supply bypass system is determined. Regardless, an uninterruptible power supply system that can smoothly perform parallel input of spare machines to each group and maintain the independence of each group is provided.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、無停電電源装置をそれぞれ出力スイッチ
を介して複数並列接続して一群の無停電電源装置群（以
下、単に群と称する）を構成し、前記各無停電電源装置
は所定の並列運転条件に従って自動制御するものとし、
前記群を複数の独立した負荷系に対応させて複数設けて
なる無停電電源システムにおいて、前記複数の群に対し
て無停電電源装置の予備機を一台設け、この予備機の出
力を切換スイッチを介して前記各群に並列接続し、この
切換スイッチをいずれか一の群に常時接続して並列運転
するものとし、前記各群は相互に出力電圧を入力して電
圧位相を同期制御する構成としたことを特徴とする。In order to achieve the above object, the present invention provides a group of uninterruptible power supply units (hereinafter simply referred to as a group) by connecting a plurality of uninterruptible power supply units in parallel via output switches. ), And each of the uninterruptible power supplies is automatically controlled according to predetermined parallel operation conditions,
In an uninterruptible power supply system in which a plurality of the groups are provided corresponding to a plurality of independent load systems, one standby unit of the uninterruptible power supply is provided for the plurality of groups, and an output of the standby unit is changed over by a switch. Are connected in parallel to the respective groups, and the changeover switches are always connected to any one of the groups to operate in parallel, and the respective groups mutually input an output voltage and synchronously control a voltage phase. It is characterized by having.
【０００８】また、上記構成のシステムの各群に対して
同一位相の商用電源をそれぞれ設け、この各商用電源と
各群の出力をそれぞれ負荷に対して無瞬断で切り換える
切換スイッチを設け、前記各群は各商用電源の電圧信号
を入力して電圧位相を同期制御する構成とすることがで
きる。In addition, a commercial power supply having the same phase is provided for each group of the system having the above-mentioned configuration, and a changeover switch for switching the output of each commercial power supply and each group to the load without interruption is provided. Each group can be configured to input voltage signals of the respective commercial power supplies and control the voltage phase synchronously.
【０００９】その場合、いずれかの群の商用電源の電源
が喪失したとき、当該商用電源が属する群の電圧位相を
健全な群の電圧位相に同期制御すべく、健全群のインバ
ータ出力電圧信号を当該群の並列制御手段に切換入力す
ることが好ましい。In this case, when the power of any one of the groups of commercial power supplies is lost, the inverter output voltage signal of the healthy group is controlled so that the voltage phase of the group to which the commercial power supply belongs is synchronized with the voltage phase of the healthy group. It is preferable that the input is switched to the parallel control means of the group.
【００１０】[0010]
【作用】このように構成したことから、本発明によれ
ば、冗長予備機は常時ある群に接続され並列運転し、か
つ他群に接続する群切換スイッチは切り離されているか
ら、各群の独立性が保持される。With this construction, according to the present invention, the redundant spare units are always connected to one group and operate in parallel, and the group changeover switch connected to the other group is disconnected. Independence is maintained.
【００１１】また、各群相互は出力電圧を相互に入力し
て電圧位相を同期制御していることから、他群の無停電
電源装置が故障等により解列した場合、予備機を解列し
た群に直ちに並列接続しても円滑かつ速やかに並列運転
に移行することになる。Further, since the output voltage is mutually input to each group and the voltage phase is synchronously controlled, the standby unit is disconnected when the uninterruptible power supply of another group is disconnected due to a failure or the like. Even if it is connected in parallel to the group immediately, the operation will be smoothly and promptly shifted to the parallel operation.
【００１２】その結果、複数の群に対して共通予備機を
一台設ける構成とすることができるので、信頼性を確保
しつつ、据付けスペース及び設備コストを低減できるこ
とになる。As a result, it is possible to provide a configuration in which one common spare unit is provided for a plurality of groups, so that it is possible to reduce installation space and equipment costs while ensuring reliability.
【００１３】また、商用電源系を介さずに他群に並列接
続できることから、商用電源の有無に拘束されずに、自
由にシステムを構成できることになる。Further, since it can be connected in parallel to another group without using a commercial power supply system, the system can be freely configured without being restricted by the presence or absence of the commercial power supply.
【００１４】[0014]
【実施例】以下、本発明を図示実施例に基づいて説明す
る。図１に本発明の一実施例の全体構成図を示す。図に
示すように本実施例の無停電電源システムは、２つの無
停電電源装置群１Ａ（以下、Ａ群という）と１Ｂ（以
下、Ｂ群という）に対し一台の予備機１Ｃが設けられて
構成されている。各群はそれぞれ２台の無停電電源装置
１Ａ−１，２と１Ｂ−１，２を有して構成されている。
各無停電電源装置１Ａ−１，２と１Ｂ−１，２１Ａ−
１，２と１Ｂ−１，２には、それぞれ整流機などの直流
電源２Ａ−１，２と２Ｂ−１，２が対応させて設けら
れ、直流電力が供給されている。各無停電電源装置１Ａ
−１，２と１Ｂ−１，２の出力は、出力スイッチ３Ａ−
１，２と３Ｂ−１，２を介して負荷４Ａと４Ｂに接続さ
れている。また、各無停電電源装置１Ａ−１，２，１Ｂ
−１，２，１Ｃはそれぞれ直流を交流電力に変換するイ
ンバータ１１と、その出力を平滑するフィルタ１２と、
インバータ１１のスイッチング素子を制御して並列運転
制御する並列制御手段１３とを含んで構成されている。
なお、図を簡単にするため、図１では無停電電源装置１
Ａ−１の内部構成のみ図示し、他の無停電電源装置につ
いては図示を省略している。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an overall configuration diagram of an embodiment of the present invention. As shown in the figure, in the uninterruptible power supply system of the present embodiment, one standby unit 1C is provided for two uninterruptible power supply groups 1A (hereinafter, referred to as A group) and 1B (hereinafter, referred to as B group). It is configured. Each group includes two uninterruptible power supplies 1A-1 and 1A-1 and 1B-1 and 2 respectively.
Each uninterruptible power supply 1A-1,2 and 1B-1,21A-
DC power supplies 2A-1 and 2B-1 and 2B-1 and 2 such as rectifiers are provided in correspondence with 1, 2 and 1B-1 and 1B, respectively, and are supplied with DC power. Each uninterruptible power supply 1A
The outputs of -1 and -2 and 1B-1 and 2 are output switches 3A-
They are connected to loads 4A and 4B via 1, 2, and 3B-1 and 2, respectively. Further, each uninterruptible power supply 1A-1, 2, 1B
-1, 2, and 1C each include an inverter 11 for converting DC to AC power, a filter 12 for smoothing the output,
And a parallel control means 13 for controlling a switching element of the inverter 11 to perform parallel operation control.
For simplicity, FIG. 1 shows an uninterruptible power supply 1
Only the internal configuration of A-1 is shown, and other uninterruptible power supply devices are not shown.
【００１５】各無停電電源装置の出力に電流変成器５Ａ
−１，２と５Ｂ−１，２と５Ｃとが設けられている。各
電流変成器には抵抗Ｒが並列接続され、その端子電圧が
出力電流信号として各並列制御手段１３に入力されてい
る。また、この出力電流信号は信号切換スイッチ７Ａ−
１，２，７Ｂ１，２を介してそれぞれ相互に並列制御手
段１３に入力されている。なお、図では単線で模式的に
記載しているが、各抵抗は並列運転される範囲でループ
状に接続し、その範囲内の全ての無停電電源装置の出力
電流に相当する電流をループに流し、これによりベクト
ル合成して各無停電電源装置の出力電流を検出して、並
列運転制御手段１３により電流バランスをとるように制
御している。この方法及び並列運転制御手段は、特開昭
５３−６８８２５又は特開昭５３−９３３３０に示され
ている公知のものであるから詳細説明は省略する。[0015] A current transformer 5A is connected to the output of each uninterruptible power supply.
-1, -2 and 5B-1, -2 and 5C are provided. A resistor R is connected in parallel to each current transformer, and the terminal voltage is input to each parallel control means 13 as an output current signal. The output current signal is supplied to the signal changeover switch 7A-
The signals are mutually input to the parallel control means 13 via 1, 2, 7B1 and 2, respectively. In the figure, each resistor is schematically illustrated by a single line.However, each resistor is connected in a loop in a range where parallel operation is performed, and a current corresponding to the output current of all the uninterruptible power supplies in the range is formed in a loop. Then, the output current of each uninterruptible power supply device is detected by vector synthesis using this, and the parallel operation control means 13 controls the current balance. This method and the parallel operation control means are publicly known ones disclosed in JP-A-53-68825 or JP-A-53-93330, and will not be described in detail.
【００１６】また、各無停電電源装置のインバータ１２
の出力電圧信号が自己の並列運転制御手段１３に入力さ
れるとともに、信号切換スイッチ７Ａ−１，２，７Ｂ−
１，２を介して各群内の他の並列運転制御手段１３に入
力されている。In addition, the inverter 12 of each uninterruptible power supply
Is output to its own parallel operation control means 13 and the signal changeover switches 7A-1, 2, 7B-
The signals are input to other parallel operation control means 13 in each group via 1 and 2.
【００１７】次に、予備機１ＣとＡ群、Ｂ群との関連構
成について説明する。予備機１Ｃの出力は群切換スイッ
チ２０Ａ，２０Ｂを介して各群の負荷４Ａ，４Ｂに接続
されている。また、並列運転制御手段に信号切換スイッ
チ２１Ａ，Ｂを介して各群の出力電流信号が、信号切換
スイッチ２２Ａ，Ｂを介して各群のインバータ出力電圧
信号が入力されるようになっている。なお、これらの信
号は更にスイッチ６Ｃ，７Ｃを介して並列運転手段に取
り込まれている。出力電流信号の信号切換スイッチ２２
Ａ，Ｂはそれぞれ群切換スイッチ２０Ａ，Ｂと連動させ
て、図示していない予備機切換手段により開閉制御され
るようになっている。また、図１における各種スイッチ
の開閉状態は通常状態を示しており、各スイッチは図示
していない予備機切換手段等により開閉制御される。Next, a description will be given of a configuration related to the spare machine 1C and the groups A and B. The output of the standby unit 1C is connected to loads 4A and 4B of each group via group changeover switches 20A and 20B. Further, output current signals of each group are input to the parallel operation control means via the signal changeover switches 21A, B, and inverter output voltage signals of each group are input via the signal changeover switches 22A, B. These signals are further taken into the parallel operating means via the switches 6C and 7C. Output current signal signal switch 22
A and B are linked with the group changeover switches 20A and 20B, respectively, and are controlled to be opened and closed by standby unit switching means (not shown). The open / closed state of various switches in FIG. 1 indicates a normal state, and each switch is controlled to open / close by a spare machine switching means (not shown).
【００１８】ここで、図２に示した予備機切換手段の機
能構成を参照しながら、上記実施例システムの動作につ
いて説明する。予備機１Ｃは予め定められた一方の群、
図示例ではＡ群に、常時並列接続される。すなわち、ス
イッチ２０Ａをオン，２０Ｂをオフし、無停電電源装置
１Ａ−１，１Ａ−２からなるＡ群と並列運転して、負荷
４Ａへ電力を供給している。このとき、出力スイッチ３
Ａ−１，３Ａ−２はオンしており、また、スイッチ６Ａ
−１，６Ａ−２，６Ｃ，７Ａ−１，７Ａ−２，７Ｃ，２
１Ａ，および２２Ａがオンされている。また、無停電電
源装置１Ｂ−１，１Ｂ−２からなるＢ群は並列運転して
負荷４Ｂへ電力を供給している。このとき、出力スイッ
チ３Ｂ−１，３Ｂ−２はオンしており、群切換スイッチ
２０Ｂ，信号切換スイッチ２２Ｂはオフされ、Ａ群と独
立に運転されている。但し、信号切換スイッチ２１Ｂは
オンされ、Ａ群と電圧位相が同期制御されている。Here, the operation of the system of the above embodiment will be described with reference to the functional configuration of the spare machine switching means shown in FIG. The spare machine 1C is one of a predetermined group,
In the illustrated example, it is always connected to the group A in parallel. That is, the switch 20A is turned on, the switch 20B is turned off, and the power is supplied to the load 4A by operating in parallel with the group A including the uninterruptible power supply devices 1A-1 and 1A-2. At this time, the output switch 3
A-1 and 3A-2 are on, and the switch 6A
-1,6A-2,6C, 7A-1,7A-2,7C, 2
1A and 22A are turned on. A group B composed of the uninterruptible power supply devices 1B-1 and 1B-2 operates in parallel to supply power to the load 4B. At this time, the output switches 3B-1 and 3B-2 are on, the group changeover switch 20B and the signal changeover switch 22B are off, and the operation is performed independently of the group A. However, the signal changeover switch 21B is turned on, and the group A and the voltage phase are synchronously controlled.
【００１９】予備機切換手段は、図２のように、予備機
を含む各無停電電源装置の故障信号を取り込み、この信
号によりまず故障の無停電電源装置を系統から切り離す
ため対応するスイッチをオフする。これと同時に、Ａ群
と予備機の故障信号を反転器３１で反転した後アンドゲ
ート３２で処理して論理積をとる。一方、Ｂ群の故障信
号をオアゲート３４で処理して論理和をとり、アンドゲ
ート３３にてアンドゲート３２の出力との論理積をと
り、この信号により群切換スイッチ２０Ａ，Ｂと信号切
換スイッチ２２Ａ，Ｂを切り換える。The standby unit switching means fetches a failure signal of each uninterruptible power supply unit including the standby unit as shown in FIG. 2, and turns off a corresponding switch to disconnect the failed uninterruptible power supply unit from the system by this signal. I do. At the same time, the fault signal of the group A and the spare machine is inverted by the inverter 31 and then processed by the AND gate 32 to obtain the logical product. On the other hand, a failure signal of the group B is processed by an OR gate 34 to obtain a logical sum, and an AND gate 33 obtains a logical product of an output of the AND gate 32, and this signal is used to perform a group changeover switch 20A, B and a signal changeover switch 22A. , B are switched.
【００２０】いま、１台の無停電電源装置が故障等によ
り解列した場合を例にとって各スイッチの動作を説明す
る。例えば、無停電電源装置１Ａ−１が故障した場合
は、出力スイッチ３Ａ−１をオフして故障機を切り離
す。このとき、予備機１Ｃは予めＡ群に接続され並列運
転しているから、電流バランスが変化するだけで円滑に
無停電により負荷４Ａへの給電が継続される。また、他
のスイッチの状態は変化しない。一方、無停電電源装置
１Ｂ−１が故障した場合は、出力スイッチ３Ｂ−１をオ
フして故障機を切り離し、同時に群切換スイッチ２０Ａ
をオフ、群切換スイッチ２０Ｂを無瞬断でオンし、予備
機１ＣをＢ群に接続して並列運転することにより負荷４
Ｂへの電力供給を確保する。このとき、スイッチ６Ｂ−
１，７Ｂ−１もオフされ並列運転制御からも切り離され
る。これにより、予備機１Ｃの無停電電源装置はＡ群か
らＢ群へ切換わり、無停電電源装置１Ｂ−２と並列運転
をおこなう。上記各スイッチの動作タイムチャートを図
３に示す。なお、各並列運転制御手段は、インバータ出
力電圧信号及び出力電流信号をベクトル制御し、インバ
−タ間の位相および出力電圧を制御するものであれば、
前述した特開昭５３−６８８２５および特開昭５３−９
３３３０に記載の制御装置でなくてもかまわない。Now, the operation of each switch will be described with an example in which one uninterruptible power supply is disconnected due to a failure or the like. For example, when the uninterruptible power supply 1A-1 fails, the output switch 3A-1 is turned off to disconnect the failed unit. At this time, since the standby unit 1C is connected to the group A in advance and is operating in parallel, the power supply to the load 4A is continued smoothly due to the uninterruptible power only by changing the current balance. Further, the states of the other switches do not change. On the other hand, when the uninterruptible power supply 1B-1 fails, the output switch 3B-1 is turned off to disconnect the failed unit, and at the same time, the group changeover switch 20A
Is turned off, the group changeover switch 20B is turned on without any instantaneous interruption, and the standby unit 1C is connected to the group B to operate in parallel, so that the load 4 is reduced.
Secure power supply to B. At this time, the switch 6B-
1,7B-1 is also turned off and disconnected from the parallel operation control. As a result, the uninterruptible power supply of the standby unit 1C is switched from the group A to the group B, and performs a parallel operation with the uninterruptible power supply 1B-2. FIG. 3 shows an operation time chart of each switch. In addition, if each parallel operation control means performs vector control of the inverter output voltage signal and the output current signal, and controls the phase and the output voltage between the inverters,
JP-A-53-68825 and JP-A-53-9 mentioned above.
The controller may not be the one described in 3330.
【００２１】以上説明したように、本実施例によれば、
冗長予備機１Ｃは常時Ａ群に接続され並列運転し、かつ
Ｂ群に接続する群切換スイッチ２０Ｂは切り離されてい
るから、Ａ群とＢ群の独立性が保持される。As described above, according to this embodiment,
Since the redundant spare unit 1C is always connected to the group A and operates in parallel, and the group changeover switch 20B connected to the group B is disconnected, the independence of the group A and the group B is maintained.
【００２２】また、Ａ群とＢ群相互は、インバータ出力
電圧を相互に入力して電圧位相を同期制御していること
から、他群の無停電電源装置が故障等により解列した場
合、予備機１Ｃを解列した群に直ちに並列接続しても円
滑かつ速やかに並列運転に移行することができる。この
結果、複数の群に対して共通予備機を一台設ける構成と
することができるので、信頼性を確保しつつ、据付けス
ペース及び設備コストを低減できることになる。また、
商用電源系を介さずに他群に並列接続できることから、
商用電源の有無に拘束されずに、自由にシステムを構成
できることになる。Further, since the group A and the group B mutually control the voltage phase by mutually inputting the inverter output voltages, when the uninterruptible power supply of another group is disconnected due to a failure or the like, the standby state is set. Even if the machine 1C is immediately connected in parallel to the group in which the machine 1C is disconnected, the operation can be smoothly and promptly shifted to the parallel operation. As a result, it is possible to provide a configuration in which one common spare machine is provided for a plurality of groups, so that it is possible to reduce installation space and equipment costs while ensuring reliability. Also,
Because it can be connected in parallel to other groups without going through the commercial power system,
The system can be freely configured without being restricted by the presence or absence of the commercial power supply.
【００２３】図４に、本発明の電源システムの他の実施
例の構成図を示す。本実施例は、各群Ａ，Ｂに対して、
それぞれ商用電源バイパス系を設けた場合のシステムで
ある。図において、３０Ａ，３０Ｂは同一位相の商用バ
イパス電源であり、変圧器３１Ａ，３１Ｂは商用バイパ
ス電源の電圧を、無停電電源装置群１Ａ，１Ｂの出力電
圧と合わせるためにある。変圧器３１Ａ，３１Ｂの出力
は、出力切換スイッチ３３Ａまたは３３Ｂを介し負荷４
Ａまたは４Ｂに接続され、各無停電電源装置群１Ａ，１
Ｂは、出力切換スイッチ３４Ａまたは３４Ｂを介し負荷
４Ａまたは４Ｂに接続される。その他の構成は図１と同
様である。FIG. 4 shows a configuration diagram of another embodiment of the power supply system of the present invention. In this embodiment, for each of the groups A and B,
These are systems in which a commercial power supply bypass system is provided. In the figure, 30A and 30B are commercial bypass power supplies of the same phase, and transformers 31A and 31B are for adjusting the voltage of the commercial bypass power supply to the output voltage of the uninterruptible power supply groups 1A and 1B. The outputs of the transformers 31A and 31B are supplied to the load 4 via the output switch 33A or 33B.
A or 4B, and each uninterruptible power supply group 1A, 1
B is connected to the load 4A or 4B via the output changeover switch 34A or 34B. Other configurations are the same as those in FIG.
【００２４】このように構成される実施例の動作を説明
する。まず、出力スイッチ３Ａ−１，２，３Ｂ−１，２
および予備機１Ｃの動作は図１と同様であるから説明は
省略する。基本的には、各群１Ａ，Ｂの無停電電源装置
は、商用電源と同期運転しており、過負荷または無停電
電源装置の２台以上の故障などの原因により、Ａ群また
はＢ群の無停電電源装置から負荷に電力を供給できない
場合に、無停電電源装置側の出力切換スイッチ３４Ａま
たは３４Ｂをオフし、３３Ａまたは３３Ｂオンして、無
瞬断で商用電源に切り換える構成となっている。The operation of the embodiment configured as described above will be described. First, the output switches 3A-1, 2, 3B-1,
The operation of the spare machine 1C is the same as that of FIG. Basically, the uninterruptible power supplies in each of the groups 1A and 1B operate synchronously with the commercial power supply, and the uninterruptible power supply of the group A or the B group due to overload or failure of two or more uninterruptible power supplies. When electric power cannot be supplied from the uninterruptible power supply to the load, the output changeover switch 34A or 34B on the uninterruptible power supply side is turned off, 33A or 33B is turned on, and the power supply is switched to the commercial power supply without interruption. .
【００２５】スイッチ３５Ａ，３５Ｂ，３６Ａ，３６Ｂ
は、商用バイパス電源と無停電電源装置群の位相を同期
させるために取り込む、電圧信号の入り切りをするため
のスイッチである。スイッチ３５Ａ，３５Ｂは通常時オ
ン、予備機１ＣがＡ群１Ａと並列運転時は３６Ａオン、
３６Ｂオフ、またＢ群１Ｂと並列運転時は３６Ｂオン、
３６Ａオフとする。スイッチ２２Ａ，２２Ｂについては
図１実施例と同様に動作させる。まず商用バイパス電源
３０Ａ，３０Ｂの電圧が確立している場合、予備機１Ｃ
がＡ群と並列運転している時はスイッチ３６Ａ，７Ａを
オン、３６Ｂ，７Ｂをオフする。ここで、無停電電源装
置１Ｂ−１が故障解列した場合は、２０Ａに連動させ２
１Ａ，２２Ａ，３６Ａをオフし、また２０Ｂに連動させ
て２１Ｂ，２２Ｂ，３６Ｂをオンする。このとき、各群
の無停電電源装置は同一位相の商用バイパス電源に同期
して運転されており、群間の同期がとれているから群切
換スイッチ２０Ａ，２０Ｂを無瞬断で切換えることが可
能である。つぎに、商用バイパス電源３０Ａ，３０Ｂの
両方または、一方が停電している場合スイッチ２１Ａ，
２１Ｂを両方オンとし、各群相互の無停電電源装置の同
期をとることにより、図１実施例の場合と同様の運用を
する。Switches 35A, 35B, 36A, 36B
Is a switch for turning on and off a voltage signal which is taken in for synchronizing the phases of the commercial bypass power supply and the uninterruptible power supply group. The switches 35A and 35B are normally turned on, and when the spare unit 1C is operated in parallel with the A group 1A, 36A is turned on.
36B off, 36B on in parallel operation with group B 1B,
36A off. The switches 22A and 22B are operated in the same manner as in the first embodiment. First, when the voltages of the commercial bypass power supplies 30A and 30B are established, the standby unit 1C
Are operating in parallel with the group A, the switches 36A and 7A are turned on, and the switches 36B and 7B are turned off. Here, when the uninterruptible power supply 1B-1 breaks down, it is linked to 20A and
1A, 22A and 36A are turned off, and 21B, 22B and 36B are turned on in conjunction with 20B. At this time, the uninterruptible power supplies in each group are operated in synchronization with the commercial bypass power supply having the same phase, and the groups are synchronized with each other. It is. Next, when both or one of the commercial bypass power supplies 30A and 30B is out of power, the switch 21A,
By turning both 21B on and synchronizing the uninterruptible power supply units of each group, the same operation as in the embodiment of FIG. 1 is performed.
【００２６】[0026]
【発明の効果】本発明によれば、冗長予備機は常時ある
群に接続され並列運転し、かつ他群に接続する群切換ス
イッチは切り離されているから、各群の独立性が保持さ
れる。According to the present invention, the redundant spare units are always connected to one group and operate in parallel, and the group changeover switch connected to another group is disconnected, so that the independence of each group is maintained. .
【００２７】また、各群相互は出力電圧を相互に入力し
て電圧位相を同期制御していることから、他群の無停電
電源装置が故障等により解列した場合、予備機を解列し
た群に直ちに並列接続しても円滑かつ速やかに並列運転
に移行することになる。Further, since the output voltage is mutually input to each group and the voltage phase is synchronously controlled, the standby unit is disconnected when the uninterruptible power supply of another group is disconnected due to a failure or the like. Even if it is connected in parallel to the group immediately, the operation will be smoothly and promptly shifted to the parallel operation.
【００２８】その結果、群に対して共通予備機を一台設
ける構成とすることができるので、信頼性を確保しつ
つ、据付けスペース及び設備コストを低減できることに
なる。As a result, it is possible to provide a configuration in which one common spare unit is provided for each group, so that it is possible to reduce installation space and equipment costs while ensuring reliability.
【００２９】また、商用電源系を介さずに他群に並列接
続できることから、商用電源の有無に拘束されずに、自
由にシステムを構成できることになる。Further, since it can be connected in parallel to another group without passing through the commercial power supply system, the system can be freely configured without being restricted by the presence or absence of the commercial power supply.
【００３０】同一位相の商用バイパス電源を各群に具備
するシステムにおいては、商用バイパス電源電圧と位相
を同期させれば、各群間のインバ−タ電圧を相互にやり
取りすることなく、自ずと各群間の無停電電源装置は同
期するのでさらに群の独立性を高めることができる。In a system in which each group is provided with a commercial bypass power supply having the same phase, if the phases are synchronized with the commercial bypass power supply voltage, the inverter voltages between the groups are not exchanged with each other, and each group is automatically connected. Since the uninterruptible power supply units are synchronized, the independence of the group can be further increased.
【図１】本発明の一実施例の無停電電源システムの全体
構成図である。FIG. 1 is an overall configuration diagram of an uninterruptible power supply system according to an embodiment of the present invention.
【図２】図１実施例の予備機切換手段の機能構成を示す
図である。FIG. 2 is a diagram showing a functional configuration of a standby unit switching unit of the embodiment in FIG. 1;
【図３】図１実施例の主要スイッチの動作を示すタイム
チャートである。FIG. 3 is a time chart showing the operation of the main switch of the embodiment in FIG. 1;
【図４】商用バイパス電源系を具備した本発明の他の実
施例の無停電電源システムの全体構成図である。FIG. 4 is an overall configuration diagram of an uninterruptible power supply system according to another embodiment of the present invention including a commercial bypass power supply system.
１Ａ，１Ｂ 無停電電源装置群 １Ａ−１，２，１Ｂ−１，２ 無停電電源装置 １Ｃ 予備機 ２Ａ−１，２，２Ｂ−１，２，２Ｃ 直流電源 ３Ａ−１，２，３Ｂ−１，２ 出力スイッチ ４Ａ，Ｂ 負荷 ５Ａ−１，２，５Ｂ−１，２，５Ｃ 電流変成器 Ｒ 抵抗器 ６Ａ−１，２，６Ｂ−１，２６Ｃ （出力電流信号の）
スイッチ ７Ａ−１，２，７Ｂ−１，２，７Ｃ （インバータ出力
電圧信号の）スイッチ ２０Ａ，Ｂ 群切換スイッチ ２１Ａ，Ｂ （インバータ出力電圧信号の）信号切換ス
イッチ ２２Ａ，Ｂ （出力電流信号の）信号切換スイッチ ３０Ａ，３０Ｂ 商用バイパス電源 ３１Ａ，３１Ｂ 変圧器 ３３Ａ，Ｂ，３４Ａ，Ｂ 出力切換スイッチ ３５Ａ，Ｂ，３６Ａ，Ｂ （商用電源電圧信号の）スイ
ッチ1A, 1B Uninterruptible power supply group 1A-1,2,1B-1,2 Uninterruptible power supply 1C Spare unit 2A-1,2,2B-1,2,2C DC power supply 3A-1,2,3B-1 , 2 output switch 4A, B load 5A-1,2,5B-1,2,5C current transformer R resistor 6A-1,2,6B-1,26C (of output current signal)
Switch 7A-1,2,7B-1,2,7C (Inverter output voltage signal) switch 20A, B group changeover switch 21A, B (Inverter output voltage signal) signal changeover switch 22A, B (Output current signal) Signal changeover switch 30A, 30B Commercial bypass power supply 31A, 31B Transformer 33A, B, 34A, B Output changeover switch 35A, B, 36A, B (for commercial power supply voltage signal) switch
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−316670（ＪＰ，Ａ) 特開 昭52−65837（ＪＰ，Ａ) 特開 平２−262869（ＪＰ，Ａ) 特開 昭53−68825（ＪＰ，Ａ) 特開 昭53−93330（ＪＰ，Ａ) 実開 昭64−40242（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02J 9/06 504 H02J 3/38 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-316670 (JP, A) JP-A-52-65837 (JP, A) JP-A-2-262869 (JP, A) JP-A 53-31667 68825 (JP, A) JP-A-53-93330 (JP, A) JP-A-64-40242 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H02J 9/06 504 H02J 3/38
Claims (7)
を介して複数並列接続して一群の無停電電源装置群（以
下、単に群と称する）を構成し、前記各無停電電源装置
は所定の並列運転条件に従って自動制御するものとし、
前記群を複数の独立した負荷系に対応させて複数設けて
なる無停電電源システムにおいて、前記複数の群に対し
て無停電電源装置の予備機を一台設け、この予備機の出
力を切換スイッチを介して前記各群に並列接続し、この
切換スイッチをいずれか一の群に常時接続して並列運転
するものとし、前記各群は相互に出力電圧を入力して電
圧位相を同期制御する構成としたことを特徴とする無停
電電源システム。A plurality of uninterruptible power supplies are connected in parallel via output switches to form a group of uninterruptible power supplies (hereinafter simply referred to as a group). It shall be automatically controlled according to the operating conditions,
In an uninterruptible power supply system in which a plurality of the groups are provided corresponding to a plurality of independent load systems, one standby unit of the uninterruptible power supply is provided for the plurality of groups, and an output of the standby unit is changed over by a switch. Are connected in parallel to the respective groups, and the changeover switches are always connected to any one of the groups to operate in parallel, and the respective groups mutually input an output voltage and synchronously control a voltage phase. An uninterruptible power supply system.
ータと該インバータの出力を平滑するフィルタと並列運
転制御手段とを含んでなる無停電電源装置を、それぞれ
出力スイッチを介して複数並列接続して一群の無停電電
源装置群（以下、単に群と称する）を構成し、前記並列
運転制御手段は自己の無停電電源装置の出力電流信号と
インバータ出力電圧信号及び他の無停電電源装置の出力
電流信号とインバータ出力電圧信号を入力し、所定の並
列運転条件に従って自己のインバータを自動制御するも
のとし、前記群を複数の独立した負荷系に対応させて複
数設けてなる無停電電源システムにおいて、前記複数の
群に対して無停電電源装置の予備機を一台設け、この予
備機の出力を群切換スイッチを介して前記各群に並列接
続し、この予備機の並列運転制御手段は、自己の出力電
流信号とインバータ出力電圧信号と、前記各群に属する
無停電電源装置のインバータ出力電圧信号と、前記各群
に属する無停電電源装置の出力電流信号を信号切換スイ
ッチを介して入力し、所定の並列運転条件に従って自己
のインバータを自動制御する構成としたことを特徴とす
る無停電電源システム。2. An uninterruptible power supply including an inverter for converting input DC to AC, a filter for smoothing the output of the inverter, and parallel operation control means, each of which is connected in parallel via an output switch. A group of uninterruptible power supply units (hereinafter simply referred to as a group), and the parallel operation control means includes an output current signal of its own uninterruptible power supply, an inverter output voltage signal, and an output of another uninterruptible power supply. A current signal and an inverter output voltage signal are input, and the inverter itself is automatically controlled according to a predetermined parallel operation condition.In an uninterruptible power supply system provided with a plurality of the groups corresponding to a plurality of independent load systems, One standby unit of an uninterruptible power supply is provided for the plurality of groups, and the output of the standby unit is connected in parallel to each group via a group changeover switch. The parallel operation control means switches between its own output current signal and inverter output voltage signal, the inverter output voltage signal of the uninterruptible power supply belonging to each group, and the output current signal of the uninterruptible power supply belonging to each group. An uninterruptible power supply system characterized in that it is configured to input via a switch and automatically control its own inverter according to predetermined parallel operation conditions.
け、この予備機切換手段は前記予備機の群切換スイッチ
と前記信号切換スイッチを予め定めた群に保持し、他の
群に属する無停電電源装置の故障信号が入力されたと
き、当該故障の無停電電源装置の前記出力スイッチをオ
フし、前記群切換スイッチと信号切換スイッチを当該故
障の無停電電源装置が属する群に切り換えるものとした
ことを特徴とする無停電電源システム。3. A spare machine switching means according to claim 2, wherein said spare machine switching means holds said spare machine group changeover switch and said signal changeover switch in a predetermined group and does not belong to another group. When a failure signal of the uninterruptible power supply is input, the output switch of the uninterruptible power supply having the failure is turned off, and the group changeover switch and the signal changeover switch are switched to a group to which the uninterruptible power supply of the failure belongs. Uninterruptible power supply system.
を介して複数並列接続して一群の無停電電源装置群（以
下、単に群と称する）を構成し、前記各無停電電源装置
は所定の並列運転条件に従って自動制御するものとし、
前記群を複数の独立した負荷系に対応させて複数設け、
この各群に対して同一位相の商用電源をそれぞれ設け、
この各商用電源と各群の出力をそれぞれ負荷に対して無
瞬断で切り換える切換スイッチを設けてなる無停電電源
システムにおいて、前記複数の群に対して無停電電源装
置の予備機を一台設け、この予備機の出力を群切換スイ
ッチを介して前記各群に並列接続し、この群切換スイッ
チをいずれか一の群に常時接続して並列運転するものと
し、前記各群は各商用電源の電圧信号を入力して電圧位
相を同期制御する構成としたことを特徴とする無停電電
源システム。4. A plurality of uninterruptible power supply devices are connected in parallel via output switches to form a group of uninterruptible power supply devices (hereinafter simply referred to as a group), and each uninterruptible power supply device has a predetermined parallel connection. It shall be automatically controlled according to the operating conditions,
A plurality of the groups are provided corresponding to a plurality of independent load systems,
Provide the same phase commercial power supply for each group,
In an uninterruptible power supply system provided with a changeover switch for switching the output of each commercial power supply and each group to a load without an instantaneous interruption, one backup unit of an uninterruptible power supply is provided for the plurality of groups. The output of the standby unit is connected in parallel to each of the groups via a group changeover switch, and this group changeover switch is always connected to any one of the groups to operate in parallel. An uninterruptible power supply system, characterized in that a voltage signal is inputted and a voltage phase is synchronously controlled.
ータと該インバータの出力を平滑するフィルタと並列運
転制御手段とを含んでなる無停電電源装置を、それぞれ
出力スイッチを介して複数並列接続して一群の無停電電
源装置群（以下、単に群と称する）を構成し、前記並列
運転制御手段は自己の無停電電源装置の出力電流信号と
インバータ出力電圧信号及び他の無停電電源装置の出力
電流信号とインバータ出力電圧信号を入力し、所定の並
列運転条件に従って自己のインバータを自動制御するも
のとし、前記群を複数の独立した負荷系に対応させて複
数設け、この各群に対して同一位相の商用電源をそれぞ
れ設け、この各商用電源と各群の出力をそれぞれ負荷に
対して無瞬断で切り換える切換スイッチを設けてなる無
停電電源システムにおいて、前記各並列制御手段は自己
の群に設けられた商用電源と電圧位相を同期制御するも
のとし、前記複数の群に対して無停電電源装置の予備機
を一台設け、この予備機の出力を群切換スイッチを介し
て前記各群に並列接続し、この予備機の並列運転制御手
段は、自己の出力電流信号とインバータ出力電圧信号
と、予備機が接続された群に属する無停電電源装置の出
力電流信号と商用電源の電圧信号とをそれぞれ信号切換
スイッチを介して入力し、所定の並列運転条件に従って
自己のインバータを自動制御するものとしたことを特徴
とする無停電電源システム。5. An uninterruptible power supply including an inverter for converting input DC to AC, a filter for smoothing the output of the inverter, and parallel operation control means, each of which is connected in parallel via an output switch. A group of uninterruptible power supply units (hereinafter simply referred to as a group), and the parallel operation control means includes an output current signal of its own uninterruptible power supply, an inverter output voltage signal, and an output of another uninterruptible power supply. A current signal and an inverter output voltage signal are input, and the inverter is automatically controlled according to a predetermined parallel operation condition.A plurality of groups are provided corresponding to a plurality of independent load systems, and the same group is provided for each group. An uninterruptible power supply system that is provided with a commercial power supply for each phase, and a changeover switch that switches the output of each commercial power supply and each group to the load without instantaneous interruption. Each of the parallel control means controls the voltage phase synchronously with the commercial power supply provided in its own group, and one standby unit of an uninterruptible power supply is provided for the plurality of groups. Are connected in parallel to the respective groups via a group changeover switch, and the parallel operation control means of the standby unit includes its own output current signal, inverter output voltage signal, and uninterruptible power supply belonging to the group to which the standby unit is connected. An uninterruptible power supply system characterized in that an output current signal of a power supply device and a voltage signal of a commercial power supply are inputted via signal changeover switches, respectively, and their own inverters are automatically controlled according to predetermined parallel operation conditions.
け、この予備機切換手段は前記予備機の群切換スイッチ
と前記信号切換スイッチを予め定めた群に保持し、他の
群に属する無停電電源装置の故障信号が入力されたと
き、当該故障の無停電電源装置の前記出力スイッチをオ
フし、前記群切換スイッチと信号切換スイッチを当該故
障の無停電電源装置が属する群に切り換えるものとした
ことを特徴とする無停電電源システム。6. A spare machine switching means according to claim 5, wherein said spare machine switching means holds said spare machine group changeover switch and said signal changeover switch in a predetermined group and does not belong to another group. When a failure signal of the uninterruptible power supply is input, the output switch of the uninterruptible power supply having the failure is turned off, and the group changeover switch and the signal changeover switch are switched to a group to which the uninterruptible power supply of the failure belongs. Uninterruptible power supply system.
は、前記いずれかの商用電源の電源が喪失したとき、当
該商用電源が属する群の電圧位相を健全な群の電圧位相
に同期制御すべく、健全群のインバータ出力電圧信号を
当該群の並列制御手段に切換入力することを特徴とする
無停電電源システム。7. The spare unit switching means according to claim 6, wherein when the power of any one of the commercial power sources is lost, the standby unit switching means synchronously controls a voltage phase of a group to which the commercial power source belongs to a voltage phase of a sound group. An uninterruptible power supply system, wherein the inverter output voltage signal of a healthy group is switched and input to the parallel control means of the group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28640391A JP3248111B2 (en) | 1991-10-31 | 1991-10-31 | Uninterruptible power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28640391A JP3248111B2 (en) | 1991-10-31 | 1991-10-31 | Uninterruptible power supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05130740A JPH05130740A (en) | 1993-05-25 |
| JP3248111B2 true JP3248111B2 (en) | 2002-01-21 |
Family
ID=17703952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28640391A Expired - Fee Related JP3248111B2 (en) | 1991-10-31 | 1991-10-31 | Uninterruptible power supply system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3248111B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4778625B2 (en) * | 2001-03-06 | 2011-09-21 | 株式会社Ｎｔｔファシリティーズ | Uninterruptible power supply system |
| KR100665950B1 (en) * | 2004-12-10 | 2007-01-10 | 주식회사 맥스컴 | A dual anger circuit configuration way of the heartlessness whole power supply |
| JP2008154403A (en) * | 2006-12-19 | 2008-07-03 | Toshiba Mitsubishi-Electric Industrial System Corp | Operation control unit for uninterruptible power supply system |
| JP5639752B2 (en) * | 2009-10-27 | 2014-12-10 | 東芝三菱電機産業システム株式会社 | Uninterruptible power supply system |
| JP5858034B2 (en) * | 2013-12-26 | 2016-02-10 | 千住金属工業株式会社 | Uninterruptible power system |
| JP5768165B2 (en) * | 2014-05-19 | 2015-08-26 | 東芝三菱電機産業システム株式会社 | Uninterruptible power supply system |
| JP6435715B2 (en) * | 2014-08-28 | 2018-12-12 | サンケン電気株式会社 | Uninterruptible power system |
| JP6418109B2 (en) * | 2015-08-31 | 2018-11-07 | 東芝三菱電機産業システム株式会社 | Uninterruptible power supply system |
| KR101668036B1 (en) * | 2016-06-28 | 2016-10-20 | (주)아세아이엔티 | Parallel ups synchronization method without communication line |
| KR102342101B1 (en) * | 2017-06-28 | 2021-12-22 | 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 | uninterruptible power system |
| KR102105090B1 (en) * | 2019-10-21 | 2020-04-27 | (주)서울전원시스템 | An apparatus for output phase feedback of inverter synchronizing in parallel operation of UPS and a method thereof |
-
1991
- 1991-10-31 JP JP28640391A patent/JP3248111B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05130740A (en) | 1993-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7129599B2 (en) | Dual feed power supply systems with enhanced power quality | |
| US7265458B2 (en) | Apparatus and methods for coordinated static switch operations for load transfers in uninterruptible power supply systems | |
| US5386147A (en) | Aerospace power control system for monitoring and reliably transferring power buses | |
| JP3248111B2 (en) | Uninterruptible power supply system | |
| US11031806B2 (en) | Uninterruptible power supply systems and methods using interconnected power routing units | |
| CA2568502A1 (en) | Apparatus for synchronizing uninterruptible power supplies | |
| JPH06311751A (en) | Ac/ dc converter | |
| JP3712068B2 (en) | Uninterruptible power system | |
| JP2009303419A (en) | Uninterruptible power supply | |
| JP6371254B2 (en) | Power converter | |
| JPH0667139B2 (en) | Uninterruptible power system | |
| JPS63157630A (en) | Non-interrupting switching of non-interrupted electric source | |
| JPH06113489A (en) | Bypass circuit maintenance of uninterruptible power supply | |
| EP4052350B1 (en) | Uninterruptible power supply system having stranded power recovery | |
| CN115843410B (en) | Redundant power supply device, system, uninterruptible power supply equipment, switch and control method | |
| JP2843364B2 (en) | Switching method for low-voltage side of distribution transformer | |
| JPS5814139B2 (en) | Denriyokukiyoukiyuuhoshiki | |
| JPS63209438A (en) | Waiting redundance type non-interrupted electric source | |
| JP2023109047A (en) | Uninterruptible power supply system | |
| JPS6331475A (en) | Self-excited inverter device | |
| JPH0879986A (en) | Static uninterruptible power source | |
| JPS61207138A (en) | Power failure-free constant voltage/constant frequency powersource unit | |
| JPH04133632A (en) | Power unit for controlling measurement | |
| JPH0629349U (en) | Parallel synchronous signal switching circuit for uninterruptible power supply | |
| JPS6070933A (en) | No-break power source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |