JP2004350407A

JP2004350407A - Load feeder circuit for uninterruptible power system

Info

Publication number: JP2004350407A
Application number: JP2003144528A
Authority: JP
Inventors: Riichi Makino; 理一牧野; Satoshi Ichiki; 敏一木
Original assignee: Hokuriku Electric Power Co; Fuji Electric Holdings Ltd
Current assignee: Fuji Electric Co Ltd; Hokuriku Electric Power Co
Priority date: 2003-05-22
Filing date: 2003-05-22
Publication date: 2004-12-09
Anticipated expiration: 2023-05-22
Also published as: JP4100620B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load feeder circuit for an uninterruptible power supply system, which can prevent instantaneous power failure, when it is feeding load with power and can turn an apparatus into a no-voltage state, at maintenance inspection work of components. <P>SOLUTION: This load feeder circuit puts the apparatus in no-load state while continuing the feed to any of first load 31 to fourth load 34 at inspection maintenance work, by constituting a first group uninterruptible power supply system 10, a second group uninterruptible power supply system 20, first bus switch SW1 to sixth bus switch SW6, eleventh load switch SW11 to fourteenth load switch SW14, twenty-first load switch SW21 to twenty-fourth load switch SW24 each as shown in the figure, and operating each. Since this can make feeding to load uninterruptive and can put the apparatus in no-load state, when performing replacement and operating inspection of the apparatus, additional fastening of connections, etc., while continuing feeding to load to improve the reliability on this feeding operation, safety of work is secured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、４台以上の無停電電源本体それぞれを互いに並列運転しつつ、複数の負荷に給電する無停電電源システムの負荷給電回路に関する。
【０００２】
【従来の技術】
負荷に給電する際に、この給電を冗長化するために複数の電力供給源から受電できる機能を有する負荷給電回路を備えたものが多く使用されている（例えば、特許文献１参照）。
【０００３】
図３は、この種の負荷給電回路の従来例として、上記特許文献１に記載されている回路構成図である。
【０００４】
すなわち図３において、４０は商用電源などの第１電力系統、５０は第１電力系統４０とは別系統の第２電力系統、ＳＷ３１は第１電力系統４０と図示の第１負荷母線との間に設置される母線開閉器、ＳＷ３２は第２電力系統５０と図示の第２負荷母線との間に設置される母線開閉器、ＳＷ３３は第１負荷母線と第２負荷母線との間に設置される母線開閉器、ＳＷ４１は第１負荷母線と第１負荷３１との間に設置される負荷開閉器、ＳＷ４２は第１負荷母線と第２負荷３２との間に設置される負荷開閉器、ＳＷ４３は第２負荷母線と第３負荷３３との間に設置される負荷開閉器、ＳＷ４４は第２負荷母線と第４負荷３４との間に設置される負荷開閉器である。
【０００５】
図３に示した回路構成において、第１負荷母線と第２負荷母線とが同時に第１電力系統４０および第２電力系統５０から充電される混電を防止するために、母線開閉器ＳＷ３３が設けられている。すなわち、母線開閉器ＳＷ３１および母線開閉器ＳＷ３２が共に閉路しているときには必ず母線開閉器ＳＷ３３を開路させており、また、母線開閉器ＳＷ３１または母線開閉器ＳＷ３２のいずれか一方のみが閉路しているときには母線開閉器ＳＷ３３も閉路させるようにしている。
【０００６】
従って、通常は母線開閉器ＳＷ３３を開路した状態では、第１電力系統４０から第１負荷３１と第２負荷３２とに給電し、第２電力系統５０から第３負荷３３と第４負荷３４とに給電し、また、第１電力系統４０または第２電力系統５０のいずれか一方に不具合が生じた場合には、これ検知して当該母線開閉器、すなわち、ＳＷ３１またはＳＷ３２のいずれかを開路すると共に、母線開閉器ＳＷ３３を閉路することにより、第１負荷３１〜第４負荷３４それぞれへの給電が行われることにより、これらの負荷への給電が冗長化されている。
【０００７】
【特許文献１】
特開平１１−４１７１８号公報（第４−５頁、第１図）
【０００８】
【発明が解決しようとする課題】
図３に示した従来の回路構成においては、第１負荷３１〜第４負荷３４それぞれへの給電が冗長化されているが、この給電動作の信頼性をより向上させるために、母線開閉器ＳＷ３１〜ＳＷ３３などの機器の交換および動作点検、接続部の増し締めなどの作業を定期的に行うことが必要であり、この作業時の安全を確保するためには当該機器に電圧が充電されていない状態（以下、単に無電圧の状態と称する）になっていることが望まれる。
【０００９】
しかしながら、図３に示した回路構成では第１負荷３１〜第４負荷３４の内、少なくとも任意の一つの負荷に対しての給電を継続しつつ、上述の作業を行う当該機器を無電圧の状態にすることが困難であるという問題点があった。
【００１０】
また、第１負荷３１〜第４負荷３４の内、少なくともいずれか一つの負荷が瞬時停電も許容できない負荷であるときには、第１電力系統４０または第２電力系統５０のいずれか一方に不具合が生じた場合に、これ検知して当該母線開閉器（ＳＷ３１またはＳＷ３２）を開路すると共に母線開閉器ＳＷ３３を閉路する際に、対応する負荷、すなわち、第１負荷３１および第２負荷３２または第３負荷３３および第４負荷３４の内、少なくとも何れか一つの負荷には瞬時停電が生じるという問題点もあった。
【００１１】
この発明の目的は、上記問題点を解消するために瞬時停電が防止でき、且つ、前記作業対象機器を無電圧の状態にできる無停電電源システムの負荷給電回路を提供することにある。
【００１２】
【課題を解決するための手段】
この発明は４台以上の無停電電源本体それぞれを互いに並列運転しつつ、これらの無停電電源本体を２分割してなる第１群無停電電源装置および第２群無停電電源装置から複数（ｎ）の負荷に給電する無停電電源システムにおいて、
前記第１群無停電電源装置を構成する無停電電源本体それぞれの出力の並列接続点と第１負荷母線との間に設置される第１母線開閉器と、前記第２群無停電電源装置を構成する無停電電源本体それぞれの出力の並列接続点と第２負荷母線との間に設置される第２母線開閉器と、前記第１群無停電電源装置の並列接続点と前記第２群無停電電源装置の並列接続点との間に挿設される第３母線開閉器と第４母線開閉器の直列接続回路と、前記第１負荷母線と第２負荷母線との間に挿設される第５母線開閉器と第６母線開閉器の直列接続回路と、前記第１負荷母線と前記負荷それぞれとの間に設置される第１ｋ（ｋ＝１、２、・・ｎ）負荷開閉器と、前記第２負荷母線と前記負荷それぞれとの間に設置される第２ｋ（ｋ＝１、２、・・ｎ）負荷開閉器とを備えたことを特徴とした無停電電源システムの負荷給電回路にする。
【００１３】
この発明によれば、後述の如く、第１群無停電電源装置および第２群無停電電源装置は共に冗長性を備えた電力供給源の機能を有するために、少なくとも任意の一つの負荷に対して、瞬時停電を発生させることなく給電を継続することが可能であり、また、第１群無停電電源装置，第２群無停電電源装置，第１母線開閉器〜第６母線開閉器それぞれは無電圧の状態にすることが可能である。
【００１４】
【発明の実施の形態】
図１は、この発明の実施の形態を示す無停電電源システムの負荷給電回路の回路構成図であり、なお、この図においては無停電電源をＵＰＳと略記している。
【００１５】
すなわち図１では、それぞれが例えば、図示しない商用電源などの交流電圧が入力される交流／直流変換器とこの変換された直流電圧を所望の交流電圧に変換して出力するインバータと前記交流／直流変換器の直流側に接続される蓄電池とからなり、周知の制御技術による並列運転機能を有する４台の無停電電源本体としての第１無停電電源本体１０ａ，第２無停電電源本体１０ｂ，第３無停電電源本体２０ａ，第４無停電電源本体２０ｂそれぞれを、通常動作時には互いに並列運転しつつ、これらの無停電電源本体を２分割してなる第１群無停電電源装置１０および第２群無停電電源装置２０から４台（前記ｎ＝４）の負荷としての第１負荷３１〜第４負荷３４に、瞬時停電を発生させることなく給電する無停電電源システムの回路構成例を示している。
【００１６】
また、図１の回路構成では第１群無停電電源装置１０を構成する無停電電源本体１０ａ，１０ｂそれぞれの出力の並列接続点と図示の第１負荷母線との間には第１母線開閉器ＳＷ１を、第２群無停電電源装置２０を構成する無停電電源本体２０ａ，２０ｂそれぞれの出力の並列接続点と図示の第２負荷母線との間には第２母線開閉器ＳＷ２を、第１群無停電電源装置１０の前記並列接続点と第２群無停電電源装置２０の前記並列接続点との間には第３母線開閉器ＳＷ３と第４母線開閉器ＳＷ４の直列接続回路を、前記第１負荷母線と第２負荷母線との間には第５母線開閉器ＳＷ５と第６母線開閉器ＳＷ６の直列接続回路を、前記第１負荷母線と第１負荷３１との間には第１１負荷開閉器ＳＷ１１を、該第１負荷母線と第２負荷３２との間には第１２負荷開閉器ＳＷ１２を、該第１負荷母線と第３負荷３３との間には第１３負荷開閉器ＳＷ１３を、該第１負荷母線と第４負荷３４との間には第１４負荷開閉器ＳＷ１４を、前記第２負荷母線と第１負荷３１との間には第２１負荷開閉器ＳＷ２１を、該第２負荷母線と第２負荷３２との間には第２２負荷開閉器ＳＷ２２を、該第２負荷母線と第３負荷３３との間には第２３負荷開閉器ＳＷ２３を、該第１負荷母線と第４負荷３４との間には第２４負荷開閉器ＳＷ２４をそれぞれ設けている。
【００１７】
この無停電電源システムとその負荷給電回路において、通常の運転状態では、第１群無停電電源装置１０，第２群無停電電源装置２０それぞれは運転状態にあり、また、第１母線開閉器ＳＷ１〜第６母線開閉器ＳＷ６それぞれはＯＮ（＝閉路）状態にあり、さらに、第１１負荷開閉器ＳＷ１１〜第１４負荷開閉器ＳＷ１４，第２１負荷開閉器ＳＷ２１〜第２４負荷開閉器ＳＷ２４それぞれもＯＮ状態にあるものとする。従って、第１負荷３１〜第４負荷３４の合計容量を並列運転している第１無停電電源本体１０ａ，第２無停電電源本体１０ｂ，第３無停電電源本体２０ａ，第４無停電電源本体２０ｂそれぞれの出力容量が分担している状態にある。
【００１８】
図１に示した回路構成において、第１群無停電電源装置１０，第２群無停電電源装置２０，第１母線開閉器ＳＷ１〜第６母線開閉器ＳＷ６それぞれ機器の交換および動作点検、接続部の増し締めなどの作業を行うときに、当該機器を無電圧の状態にするための操作を、図２に示す説明図を参照しつつ、以下に説明する。なお、図２においては無停電電源をＵＰＳと略記している。
【００１９】
先ず、第１群無停電電源装置１０を無電圧の状態にするためには、第１母線開閉器ＳＷ１と第３母線開閉器ＳＷ３とをＯＦＦ（＝開路）すればよい。なお、このときには第２群無停電電源装置２０から第１負荷３１〜第４負荷３４に給電することになるため、第２群無停電電源装置２０が出力できる容量に対応して、前以って、第１負荷３１〜第４負荷３４のいずれかへの給電を停止することも必要である。例えば、第２負荷３２への給電を停止する場合には、第１２負荷開閉器ＳＷ１２と第２２負荷開閉器ＳＷ２２とをＯＦＦすればよい。
【００２０】
次に、第２群無停電電源装置２０を無電圧の状態にするためには、第２母線開閉器ＳＷ２と第４母線開閉器ＳＷ４とをＯＦＦ（＝開路）すればよい。なお、このときには第１群無停電電源装置１０から第１負荷３１〜第４負荷３４に給電することになるため、第１群無停電電源装置１０が出力できる容量に対応して、前以って、第１負荷３１〜第４負荷３４のいずれかへの給電を停止することも必要である。例えば、第３負荷３３への給電を停止する場合には、第１３負荷開閉器ＳＷ１３と第２３負荷開閉器ＳＷ２３とをＯＦＦすればよい。
【００２１】
次に、第１負荷開閉器ＳＷ１を無電圧の状態にするためには、第１群無停電電源装置１０を停止させるとともに、第３母線開閉器ＳＷ３と第５母線開閉器ＳＷ５と第１１負荷開閉器ＳＷ１１〜第１４負荷開閉器ＳＷ１４とをＯＦＦ（＝開路）すればよい。なお、このときには第２群無停電電源装置２０から第１負荷３１〜第４負荷３４に給電することになるため、第２群無停電電源装置２０が出力できる容量に対応して、前以って、第１負荷３１〜第４負荷３４のいずれかへの給電を停止することも必要である。例えば、第２負荷３２への給電を停止する場合には、第２２負荷開閉器ＳＷ２２もＯＦＦすればよい。
【００２２】
次に、第２負荷開閉器ＳＷ２を無電圧の状態にするためには、第２群無停電電源装置２０を停止させるとともに、第４母線開閉器ＳＷ４と第６母線開閉器ＳＷ６と第２１負荷開閉器ＳＷ２１〜第２４負荷開閉器ＳＷ２４とをＯＦＦ（＝開路）すればよい。なお、このときには第１群無停電電源装置１０から第１負荷３１〜第４負荷３４に給電することになるため、第１群無停電電源装置１０が出力できる容量に対応して、前以って、第１負荷３１〜第４負荷３４のいずれかへの給電を停止することも必要である。例えば、第３負荷３３への給電を停止する場合には、第１３負荷開閉器ＳＷ１３もＯＦＦすればよい。
【００２３】
次に、第３負荷開閉器ＳＷ１を無電圧の状態にするためには、第１群無停電電源装置１０を停止させるとともに、第１母線開閉器ＳＷ１と第４母線開閉器ＳＷ４とをＯＦＦ（＝開路）すればよい。なお、このときには第２群無停電電源装置２０から第１負荷３１〜第４負荷３４に給電することになるため、第２群無停電電源装置２０が出力できる容量に対応して、前以って、第１負荷３１〜第４負荷３４のいずれかへの給電を停止することも必要である。例えば、第２負荷３２への給電を停止する場合には、第２２負荷開閉器ＳＷ２２もＯＦＦすればよい。
【００２４】
次に、第４負荷開閉器ＳＷ４を無電圧の状態にするためには、第２群無停電電源装置２０を停止させるとともに、第２母線開閉器ＳＷ２と第３母線開閉器ＳＷ３とをＯＦＦ（＝開路）すればよい。なお、このときには第１群無停電電源装置１０から第１負荷３１〜第４負荷３４に給電することになるため、第１群無停電電源装置１０が出力できる容量に対応して、前以って、第１負荷３１〜第４負荷３４のいずれかへの給電を停止することも必要である。例えば、第３負荷３３への給電を停止する場合には、第１３負荷開閉器ＳＷ１３もＯＦＦすればよい。
【００２５】
次に、第５母線開閉器ＳＷ５を無電圧の状態にするためには、第１母線開閉器ＳＷ１と第６母線開閉器ＳＷ６と第１１負荷開閉器ＳＷ１１〜第１４負荷開閉器ＳＷ１４とをＯＦＦ（＝開路）すればよい。
【００２６】
最後に、第６母線開閉器ＳＷ６を無電圧の状態にするためには、第２母線開閉器ＳＷ２と第５母線開閉器ＳＷ５と第２１負荷開閉器ＳＷ２１〜第２４負荷開閉器ＳＷ４４とをＯＦＦ（＝開路）すればよい。
【００２７】
【発明の効果】
この発明の無停電電源システムの負荷給電回路によれば、負荷への給電が無停電化することができ、この給電動作の信頼性をより向上させるために、前記負荷への給電を継続しつつ、当該機器の交換および動作点検、接続部の増し締めなどの作業を定期的に行う際には、該機器を無電圧の状態にすることができるので、前記作業の安全性が確保される。
【図面の簡単な説明】
【図１】この発明の実施の形態を示す回路構成図
【図２】図１の動作の説明図
【図３】従来例を示す回路構成図
【符号の説明】
１０…第１群無停電電源装置、１０ａ…第１無停電電源本体、１０ｂ…第２無停電電源本体、２０…第２群無停電電源装置、２０ａ…第３無停電電源本体、２０ｂ…第４無停電電源本体、３１〜３４…第１負荷〜第４負荷、４０…第１電力系統、５０…第２電力系統、ＳＷ１〜ＳＷ６…第１母線開閉器〜第６母線開閉器、ＳＷ１１〜ＳＷ１４…第１１負荷開閉器〜第１４負荷開閉器、ＳＷ２１〜ＳＷ２４…第２１負荷開閉器〜第２４負荷開閉器、ＳＷ３１〜ＳＷ３３…母線開閉器、ＳＷ４１〜ＳＷ４４…負荷開閉器。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a load power supply circuit of an uninterruptible power supply system that supplies power to a plurality of loads while operating four or more uninterruptible power supply bodies in parallel with each other.
[0002]
[Prior art]
When power is supplied to a load, a device having a load power supply circuit having a function of receiving power from a plurality of power supply sources is often used to make the power supply redundant (for example, see Patent Document 1).
[0003]
FIG. 3 is a circuit configuration diagram described in Patent Document 1 as a conventional example of this type of load power supply circuit.
[0004]
That is, in FIG. 3, 40 is a first power system such as a commercial power supply, 50 is a second power system different from the first power system 40, and SW31 is between the first power system 40 and the illustrated first load bus. , SW32 is a bus switch installed between the second power system 50 and the illustrated second load bus, and SW33 is installed between the first load bus and the second load bus. SW41 is a load switch installed between the first load bus and the first load 31, SW42 is a load switch installed between the first load bus and the second load 32, and SW43. Is a load switch installed between the second load bus and the third load 33, and SW44 is a load switch installed between the second load bus and the fourth load.
[0005]
In the circuit configuration shown in FIG. 3, a bus switch SW33 is provided to prevent the first load bus and the second load bus from being charged simultaneously from the first power system 40 and the second power system 50. Have been. That is, when both the bus switch SW31 and the bus switch SW32 are closed, the bus switch SW33 is always opened, and only one of the bus switch SW31 or the bus switch SW32 is closed. Sometimes, the bus switch SW33 is also closed.
[0006]
Therefore, normally, when the bus switch SW33 is open, power is supplied from the first power system 40 to the first load 31 and the second load 32, and the third load 33 and the fourth load 34 are supplied from the second power system 50. And when a failure occurs in either the first power system 40 or the second power system 50, this is detected and the bus switch, that is, either SW31 or SW32 is opened. At the same time, by closing the bus switch SW33, power is supplied to each of the first load 31 to the fourth load 34, and power supply to these loads is made redundant.
[0007]
[Patent Document 1]
JP-A-11-41718 (page 4-5, FIG. 1)
[0008]
[Problems to be solved by the invention]
In the conventional circuit configuration shown in FIG. 3, the power supply to each of the first load 31 to the fourth load 34 is made redundant. However, in order to further improve the reliability of this power supply operation, the bus switch SW31 ~ It is necessary to periodically perform operations such as replacement of devices such as SW33, operation check, retightening of connection parts, etc. In order to ensure safety during this operation, the devices are not charged with voltage It is desired to be in a state (hereinafter, simply referred to as a no-voltage state).
[0009]
However, in the circuit configuration shown in FIG. 3, while the power supply to at least any one of the first to fourth loads 31 to 34 is continued, the device performing the above-described operation is brought into a non-voltage state. There was a problem that it was difficult to make.
[0010]
Further, when at least one of the first load 31 to the fourth load 34 is a load in which an instantaneous power failure cannot be tolerated, a failure occurs in one of the first power system 40 and the second power system 50. In this case, when this is detected and the bus switch (SW31 or SW32) is opened and the bus switch SW33 is closed, the corresponding load, that is, the first load 31, the second load 32, or the third load is used. There is also a problem that an instantaneous power failure occurs in at least one of the load 33 and the fourth load 34.
[0011]
An object of the present invention is to provide a load power supply circuit of an uninterruptible power supply system capable of preventing an instantaneous power failure and eliminating the voltage of the work target device in order to solve the above problem.
[0012]
[Means for Solving the Problems]
According to the present invention, a plurality (n) of a first group uninterruptible power supply and a second group uninterruptible power supply obtained by dividing the uninterruptible power supply into two while operating four or more uninterruptible power supplies in parallel with each other. ) In an uninterruptible power supply system
A first bus switch installed between a parallel connection point of outputs of each of the uninterruptible power supply main units constituting the first group uninterruptible power supply and a first load bus, and the second group uninterruptible power supply. A second busbar switch installed between a parallel connection point of the output of each of the uninterruptible power supply bodies to be configured and a second load bus, a parallel connection point of the first group uninterruptible power supply and the second group A series connection circuit of a third bus switch and a fourth bus switch inserted between the parallel connection point of the power failure power supply device and the first load bus and the second load bus. A series connection circuit of a fifth bus switch and a sixth bus switch, and a first k (k = 1, 2,... N) load switch installed between the first load bus and each of the loads. , A second k (k = 1, 2,... N) load switch installed between the second load bus and each of the loads Preparative to the load feeder circuit of an uninterruptible power supply system, comprising the.
[0013]
According to the present invention, as described later, both the first group uninterruptible power supply and the second group uninterruptible power supply have a function of a power supply source with redundancy, so that at least any one load Therefore, it is possible to continue power supply without causing an instantaneous power failure, and the first group uninterruptible power supply, the second group uninterruptible power supply, the first bus switch to the sixth bus switch, It is possible to make a state of no voltage.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a circuit diagram of a load power supply circuit of an uninterruptible power supply system according to an embodiment of the present invention. In this figure, the uninterruptible power supply is abbreviated as UPS.
[0015]
That is, in FIG. 1, for example, an AC / DC converter to which an AC voltage such as a commercial power supply (not shown) is input, an inverter that converts the converted DC voltage into a desired AC voltage and outputs the same, and the AC / DC converter A first uninterruptible power supply unit 10a, a second uninterruptible power supply unit 10b, and four uninterruptible power supply units each having a storage battery connected to the DC side of the converter and having a parallel operation function using a well-known control technique. The first uninterruptible power supply unit 10 and the second group, which are obtained by dividing the uninterruptible power supply main body into two while operating the 3 uninterruptible power supply main body 20a and the fourth uninterruptible power supply main body 20b in parallel during normal operation. Circuit configuration example of the uninterruptible power supply system that supplies power from the uninterruptible power supply 20 to the first to fourth loads 31 to 34 as the four loads (the n = 4) without causing an instantaneous power outage Shows.
[0016]
In the circuit configuration of FIG. 1, a first bus switch is provided between a parallel connection point of the outputs of the uninterruptible power supply bodies 10 a and 10 b constituting the first group uninterruptible power supply 10 and the illustrated first load bus. SW1 and a second bus switch SW2 between the parallel connection point of the respective outputs of the uninterruptible power supply units 20a and 20b constituting the second group uninterruptible power supply 20 and the illustrated second load bus. A series connection circuit of a third bus switch SW3 and a fourth bus switch SW4 is provided between the parallel connection point of the group uninterruptible power supply 10 and the parallel connection point of the second group uninterruptible power supply 20, A series connection circuit of a fifth bus switch SW5 and a sixth bus switch SW6 is provided between the first load bus and the second load bus, and an eleventh switch is provided between the first load bus and the first load 31. A load switch SW11 is provided between the first load bus and the second load 32. A 12 load switch SW12, a 13th load switch SW13 between the first load bus and the third load 33, and a 14th load switch SW between the first load bus and the fourth load 34. SW14, a 21st load switch SW21 between the second load bus and the first load 31, a 22nd load switch SW22 between the second load bus and the second load 32, A twenty-third load switch SW23 is provided between the second load bus and the third load 33, and a twenty-fourth load switch SW24 is provided between the first load bus and the fourth load.
[0017]
In the uninterruptible power supply system and its load power supply circuit, in a normal operation state, each of the first group uninterruptible power supply 10 and the second group uninterruptible power supply 20 is in the operation state, and the first bus switch SW1 To the sixth bus switch SW6 are ON (= closed), and the eleventh load switch SW11 to the fourteenth load switch SW14, the twenty-first load switch SW21 to the twenty-fourth load switch SW24 are also ON. State. Therefore, the first uninterruptible power supply main body 10a, the second uninterruptible power supply main body 10b, the third uninterruptible power supply main body 20a, and the fourth uninterruptible power supply main body that are operating in parallel with the total capacity of the first load 31 to the fourth load 34 The output capacity of each of the output capacitors 20b is in a shared state.
[0018]
In the circuit configuration shown in FIG. 1, the first group uninterruptible power supply 10, the second group uninterruptible power supply 20, the first bus switch SW1 to the sixth bus switch SW6, respectively, exchange of equipment, operation check, and connection unit. An operation for bringing the device into a non-voltage state when performing an operation such as retightening of the device will be described below with reference to an explanatory diagram shown in FIG. In FIG. 2, the uninterruptible power supply is abbreviated as UPS.
[0019]
First, in order to bring the first group uninterruptible power supply 10 into a no-voltage state, the first bus switch SW1 and the third bus switch SW3 may be turned off (= open). At this time, power is supplied from the second group uninterruptible power supply 20 to the first load 31 to the fourth load 34, so that the second group uninterruptible power supply 20 has a capacity that can be output in advance. Therefore, it is necessary to stop supplying power to any of the first load 31 to the fourth load 34. For example, when the power supply to the second load 32 is stopped, the twelfth load switch SW12 and the twenty-second load switch SW22 may be turned off.
[0020]
Next, in order to bring the second group uninterruptible power supply device 20 into a no-voltage state, the second bus switch SW2 and the fourth bus switch SW4 may be turned off (= open). At this time, power is supplied from the first group uninterruptible power supply 10 to the first load 31 to the fourth load 34, and therefore, the first group uninterruptible power supply 10 has a capacity corresponding to the output capacity. Therefore, it is necessary to stop supplying power to any of the first load 31 to the fourth load 34. For example, when stopping the power supply to the third load 33, the thirteenth load switch SW13 and the twenty-third load switch SW23 may be turned off.
[0021]
Next, in order to bring the first load switch SW1 into a no-voltage state, the first group uninterruptible power supply 10 is stopped, and the third bus switch SW3, the fifth bus switch SW5, and the eleventh load are switched. The switches SW11 to SW14 may be turned off (= open circuit). At this time, power is supplied from the second group uninterruptible power supply 20 to the first load 31 to the fourth load 34, so that the second group uninterruptible power supply 20 has a capacity that can be output in advance. Therefore, it is necessary to stop supplying power to any of the first load 31 to the fourth load 34. For example, when stopping the power supply to the second load 32, the 22nd load switch SW22 may be turned off.
[0022]
Next, in order to bring the second load switch SW2 into a no-voltage state, the second group uninterruptible power supply 20 is stopped, and the fourth bus switch SW4, the sixth bus switch SW6, and the twenty-first load are switched. The switches SW21 to SW24 may be turned off (= open circuit). At this time, power is supplied from the first group uninterruptible power supply 10 to the first load 31 to the fourth load 34, and therefore, the first group uninterruptible power supply 10 has a capacity corresponding to the output capacity. Therefore, it is necessary to stop supplying power to any of the first load 31 to the fourth load 34. For example, when the power supply to the third load 33 is stopped, the thirteenth load switch SW13 may be turned off.
[0023]
Next, in order to bring the third load switch SW1 into a no-voltage state, the first group uninterruptible power supply 10 is stopped, and the first bus switch SW1 and the fourth bus switch SW4 are turned off ( = Open circuit). At this time, power is supplied from the second group uninterruptible power supply 20 to the first load 31 to the fourth load 34, so that the second group uninterruptible power supply 20 has a capacity that can be output in advance. Therefore, it is necessary to stop supplying power to any of the first load 31 to the fourth load 34. For example, when stopping the power supply to the second load 32, the 22nd load switch SW22 may be turned off.
[0024]
Next, in order to set the fourth load switch SW4 to a no-voltage state, the second group uninterruptible power supply device 20 is stopped, and the second bus switch SW2 and the third bus switch SW3 are turned off ( = Open circuit). At this time, power is supplied from the first group uninterruptible power supply 10 to the first load 31 to the fourth load 34, and therefore, the first group uninterruptible power supply 10 has a capacity corresponding to the output capacity. Therefore, it is necessary to stop supplying power to any of the first load 31 to the fourth load 34. For example, when the power supply to the third load 33 is stopped, the thirteenth load switch SW13 may be turned off.
[0025]
Next, in order to set the fifth bus switch SW5 to a no-voltage state, the first bus switch SW1, the sixth bus switch SW6, the eleventh load switch SW11 to the fourteenth load switch SW14 are turned off. (= Open circuit).
[0026]
Finally, in order to set the sixth bus switch SW6 to a no-voltage state, the second bus switch SW2, the fifth bus switch SW5, the 21st load switch SW21 to the 24th load switch SW44 are turned off. (= Open circuit).
[0027]
【The invention's effect】
According to the load power supply circuit of the uninterruptible power supply system of the present invention, the power supply to the load can be uninterrupted, and in order to further improve the reliability of the power supply operation, the power supply to the load is continued. When the work such as the replacement of the device and the operation check and the retightening of the connection portion are periodically performed, the device can be brought into a state of no voltage, so that the safety of the work is ensured.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of the present invention. FIG. 2 is an explanatory diagram of the operation of FIG. 1. FIG. 3 is a circuit diagram showing a conventional example.
DESCRIPTION OF SYMBOLS 10 ... 1st group uninterruptible power supply unit, 10a ... 1st uninterruptible power supply main unit, 10b ... 2nd uninterruptible power supply unit, 20 ... 2nd group uninterruptible power supply unit, 20a ... 3rd uninterruptible power supply unit, 20b ... No. 4 uninterruptible power supply main body, 31 to 34: first load to fourth load, 40: first power system, 50: second power system, SW1 to SW6: first bus switch to sixth bus switch, SW11 to SW11 SW14: 11th load switch to 14th load switch, SW21 to SW24: 21st load switch to 24th load switch, SW31 to SW33: bus switch, SW41 to SW44: load switch.

Claims

４台以上の無停電電源本体それぞれを互いに並列運転しつつ、これらの無停電電源本体を２分割してなる第１群無停電電源装置および第２群無停電電源装置から複数（ｎ）の負荷に給電する無停電電源システムにおいて、
前記第１群無停電電源装置を構成する無停電電源本体それぞれの出力の並列接続点と第１負荷母線との間に設置される第１母線開閉器と、
前記第２群無停電電源装置を構成する無停電電源本体それぞれの出力の並列接続点と第２負荷母線との間に設置される第２母線開閉器と、
前記第１群無停電電源装置の並列接続点と前記第２群無停電電源装置の並列接続点との間に挿設される第３母線開閉器と第４母線開閉器の直列接続回路と、
前記第１負荷母線と第２負荷母線との間に挿設される第５母線開閉器と第６母線開閉器の直列接続回路と、
前記第１負荷母線と前記負荷それぞれとの間に設置される第１ｋ（ｋ＝１、２、・・ｎ）負荷開閉器と、
前記第２負荷母線と前記負荷それぞれとの間に設置される第２ｋ（ｋ＝１、２、・・ｎ）負荷開閉器と、
を備えたことを特徴とする無停電電源システムの負荷給電回路。While the four or more uninterruptible power supply units are operated in parallel with each other, a plurality (n) of loads from the first group uninterruptible power supply unit and the second group uninterruptible power supply unit obtained by dividing these uninterruptible power supply units into two parts Uninterruptible power supply system
A first busbar switch installed between a parallel connection point of outputs of each of the uninterruptible power supply main units constituting the first group uninterruptible power supply device and a first load busbar;
A second busbar switch installed between a parallel connection point of outputs of each uninterruptible power supply main body constituting the second group uninterruptible power supply device and a second load busbar;
A series connection circuit of a third bus switch and a fourth bus switch inserted between a parallel connection point of the first group uninterruptible power supply and a parallel connection point of the second group uninterruptible power supply;
A series connection circuit of a fifth bus switch and a sixth bus switch inserted between the first load bus and the second load bus;
A first k (k = 1, 2,... N) load switch installed between the first load bus and each of the loads;
A second k (k = 1, 2,... N) load switch installed between the second load bus and each of the loads;
A load power supply circuit for an uninterruptible power supply system, comprising: