JPH053208B2 - - Google Patents
Info
- Publication number
- JPH053208B2 JPH053208B2 JP63082242A JP8224288A JPH053208B2 JP H053208 B2 JPH053208 B2 JP H053208B2 JP 63082242 A JP63082242 A JP 63082242A JP 8224288 A JP8224288 A JP 8224288A JP H053208 B2 JPH053208 B2 JP H053208B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- overcurrent
- circuit
- stabilized power
- load
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 claims 2
- 239000003381 stabilizer Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
Landscapes
- Stand-By Power Supply Arrangements (AREA)
- Protection Of Static Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Description
【発明の詳細な説明】
本発明は交流安定化電源を複数台用いた無停電
電源に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an uninterruptible power supply using a plurality of AC stabilized power supplies.
第１図に従来の無停電電源装置の一例を示す。 FIG. 1 shows an example of a conventional uninterruptible power supply.
第１図にて、１，２は交流又は直流電源、３，
４は電圧、周波数、位相、を制御できる交流安定
化電源、５，６は交流安定化電源故障時に負荷を
切り離す高速度しや断器、７，８は過電流検出回
路、９は負荷、１０，１１は過電流垂下制御回
路、１２，１３は交流安定化電源の故障検出回路
である。常時は交流または直流電源１，２を交流
安定化電源３，４により安定した交流電源に変換
し、高速度しや断器５，６を介して負荷９へ電力
を供給する。 In Figure 1, 1 and 2 are AC or DC power supplies, 3,
4 is a stabilized AC power supply that can control the voltage, frequency, and phase; 5 and 6 are high-speed disconnectors that disconnect the load when the stabilized AC power supply fails; 7 and 8 are overcurrent detection circuits; 9 is a load; 10 , 11 are overcurrent droop control circuits, and 12 and 13 are failure detection circuits for the AC stabilized power supply. Normally, the AC or DC power supplies 1 and 2 are converted into stable AC power by the AC stabilized power supplies 3 and 4, and the power is supplied to the load 9 via the high speed disconnectors 5 and 6.
また、負荷９が事故（例えば短絡事故）を起こ
した場合には、負荷短絡電流を過電流検出回路
７，８にて瞬時に検出し、過電流検出回路７，８
は過電流垂下制御回路１０，１１へ検出信号を送
出する。過電流垂下制御回路１０，１１は交流安
定化電源３，４へ垂下制御指令を送出する。垂下
制御指令を受けた交流安定化電源３，４は出力電
圧を0V附近まで瞬時に低下させ交流安定化電源
３，４の出力電流を急速に限流し、負荷９の事故
による交流安定化電源３，４の過電流故障を防止
する。 In addition, when the load 9 causes an accident (for example, a short circuit accident), the load short circuit current is instantly detected by the overcurrent detection circuits 7 and 8, and the overcurrent detection circuits 7 and 8
sends a detection signal to the overcurrent droop control circuits 10 and 11. Overcurrent droop control circuits 10 and 11 send droop control commands to AC stabilized power supplies 3 and 4. The AC stabilized power supplies 3 and 4 that received the droop control command instantaneously lower their output voltages to around 0V, and rapidly limit the output current of the AC stabilized power supplies 3 and 4. , 4 to prevent overcurrent failures.
負荷９の事故が回復した場合には交流安定化電
源３，４の出力電圧を正規の出力電圧まで除々に
回復させ負荷９へ電力を供給する。 When the load 9 recovers from the accident, the output voltages of the AC stabilized power supplies 3 and 4 are gradually restored to the normal output voltage and power is supplied to the load 9.
そして交流安定化電源３，４が故障した場合に
は、故障検出回路１２，１３にて交流安定化電源
３，４の故障を検出し高速度しや断器５，６へし
や断指令を送出すると共に、交流安定化電源３，
４の出力を瞬時に0V附近まで低下させる。高速
度しや断器５，６は故障検出回路１２，１３より
のしや断指令で負荷９を交流安定化電源３，４よ
り高速度に切り離す様構成されている。ところが
例えば交流安定化電源４が故障してから高速度し
や断器６によつて負荷９から切り離されるまでに
約100〜200μsecの時間を必要とする。この間交流
安定化電源３は交流安定化電源４の出力電圧が
0Vとなつているため交流安定化電源４へ横流を
流し込みまた、負荷９への電力を供給するため過
電流検出回路７は交流安定化電源３よりの負荷９
への供給電流と交流安定化電源４への横流の和を
検出することになり過電流検出をしてしまうこと
がある。 When the AC stabilized power supplies 3 and 4 fail, the failure detection circuits 12 and 13 detect the failure of the AC stabilized power supplies 3 and 4 and issue a shear cutoff command to the high-speed shield disconnectors 5 and 6. Along with sending out the AC stabilized power supply 3,
Instantly lowers the output of 4 to around 0V. The high-speed shield disconnectors 5 and 6 are configured to disconnect the load 9 from the AC stabilized power supplies 3 and 4 at high speed in response to a shield disconnection command from the failure detection circuits 12 and 13. However, for example, it takes about 100 to 200 μsec from the time when the AC stabilized power supply 4 fails until it is disconnected from the load 9 by the high-speed disconnector 6. During this period, the output voltage of the AC stabilized power supply 4 is
Since the voltage is 0V, a cross current flows into the AC stabilized power supply 4, and in order to supply power to the load 9, the overcurrent detection circuit 7 detects the load 9 from the AC stabilized power supply 3.
Since the sum of the current supplied to the AC stabilized power supply 4 and the cross current to the AC stabilized power supply 4 is detected, an overcurrent may be detected.
過電流検出回路７が動作をすると過電流検出信
号が過電流垂下制御回路１４へ送出され過電流垂
下制御回路１０は交流安定化電源３へ垂下制御指
令を送出し交流安定化電源３は出力電圧を瞬時に
0Vまで低下させる。交流安定化電源３の垂下制
御は故障した交流安定化電源４が切り離されるま
で続き、交流安定化電源３の出力電圧回復は除々
に行なわれるため負荷９への安定した電力供給が
されるまでには数十〜数百msの時間を必要とし
てしまい、その間負荷９は停止せざるを得ないと
いう不具合があつた。 When the overcurrent detection circuit 7 operates, an overcurrent detection signal is sent to the overcurrent droop control circuit 14, and the overcurrent droop control circuit 10 sends a drooping control command to the AC stabilized power supply 3, and the AC stabilized power supply 3 changes the output voltage. instantly
Reduce to 0V. The droop control of the AC stabilized power supply 3 continues until the failed AC stabilized power supply 4 is disconnected, and the output voltage of the AC stabilized power supply 3 is gradually recovered, so that it takes until stable power is supplied to the load 9. The problem was that it took several tens to hundreds of milliseconds, and the load 9 had to be stopped during that time.
よつて本発明の目的は交流安定化電源を複数台
並列に接続された無停電電源装置において、１台
の交流安定化電源が故障しても前記した不具合を
解消し負荷へは連続して安定した電力を供給する
無停電電源装置を提供することにある。 Therefore, an object of the present invention is to eliminate the above-mentioned problems and provide continuous and stable supply to the load in an uninterruptible power supply system in which a plurality of AC stabilized power supplies are connected in parallel, even if one AC stabilized power supply fails. An object of the present invention is to provide an uninterruptible power supply device that supplies electric power.
第２図に本発明による無停電電源装置の一実施
例を示す。 FIG. 2 shows an embodiment of an uninterruptible power supply according to the present invention.
図において、１，２は交流又は直流電源、３，
４は交流安定化電源、５，６は高速度しや断器、
９は負荷、１０，１１は過電流垂下制御回路、１
２，１３は交流安定化電源の故障検出回路、１
４，１５は交流安定化電源の並列台数に応じた電
流検出を行うことのできる過電流検出回路であ
る。 In the figure, 1 and 2 are AC or DC power supplies, 3,
4 is an AC stabilized power supply, 5 and 6 are high-speed power switches,
9 is a load, 10 and 11 are overcurrent droop control circuits, 1
2 and 13 are failure detection circuits for AC stabilized power supply, 1
Reference numerals 4 and 15 designate overcurrent detection circuits capable of detecting current according to the number of parallel AC stabilized power supplies.
以下本発明による無停電電源装置の動作を説明
する。 The operation of the uninterruptible power supply according to the present invention will be explained below.
まず過電流検出回路１４，１５は交流安定化電
源の並列台数に応じた負荷電流（つまり２台であ
れば負荷９の負荷電流の1/2、３台であれば負荷
９の負荷電流の1/3にて）にて、過電流検出がで
きる様に高速度しや断器５，６の補助スイツチを
用いて構成されている。 First, the overcurrent detection circuits 14 and 15 detect a load current corresponding to the number of parallel AC stabilized power supplies (that is, 1/2 of the load current of load 9 if there are two power supplies, or 1/2 of the load current of load 9 if there are three power supplies). /3), it is configured using auxiliary switches of high-speed shutoff circuits 5 and 6 so that overcurrent detection can be performed.
過電流検出回路１４，１５に設けられている抵
抗器と高速度しや遮器５，６の補助スイツチとか
ら成る直列回路は、高速度しや遮器５，６の開路
条件で他方の交流安定化電源４，３の過電流検出
回路１５，１４の検出レベルを低下させ、交流安
定化電源３，４のいずれか１台が運転される場合
でも確実に過電流を検出するための回路である。 A series circuit consisting of the resistors provided in the overcurrent detection circuits 14 and 15 and the auxiliary switches of the high-speed shield circuit breakers 5 and 6 is configured such that when the high-speed shield circuit breakers 5 and 6 are open, the other AC This circuit lowers the detection level of the overcurrent detection circuits 15, 14 of the stabilized power supplies 4, 3, and reliably detects overcurrent even when either one of the stabilized AC power supplies 3, 4 is operated. be.
交流安定化電源３，４が高速度しや断器５，６
を介して並列運転し負荷に電力を供給していると
き、交流安定化電源４が故障したとすると交流安
定化電源４は故障検出回路１３により故障検出
し、故障検出回路１３のしや断指令により高速度
しや断器６をしや断する。 AC stabilized power supplies 3 and 4 are connected to high-speed circuit breakers 5 and 6
If the AC stabilized power supply 4 fails while operating in parallel to supply power to the load via the The high speed shear breaker 6 is sheared.
このとき交流安定化電源３は負荷９への負荷電
流と交流安定化電源４への横流を流すことになる
が、過電流検出回路１４は負荷９の負荷電流のみ
に応動し、交流安定化電源４への横流には全く応
動しないので負荷９の負荷電流が過電流検出レベ
ル以下ならば過電流検出回路は応動せず、交流安
定化電源３は負荷９へ連続して電力を供給するこ
とができ、負荷９へ悪影響をおよぼさず交流安定
化電源４を切り離すことができる。 At this time, the AC stabilized power supply 3 will flow a load current to the load 9 and a cross current to the AC stabilized power supply 4, but the overcurrent detection circuit 14 responds only to the load current of the load 9, and If the load current of the load 9 is below the overcurrent detection level, the overcurrent detection circuit will not respond and the AC stabilized power supply 3 will be able to continuously supply power to the load 9. Therefore, the AC stabilized power supply 4 can be disconnected without adversely affecting the load 9.
第１図は従来の無停電電源装置のブロツク図、
第２図は本発明の一実施例を示す無停電電源装置
のブロツク図である。
１，２……交流又は直流電源、３，４……交流
安定化電源、５，６……高速度しや断器、７，
８，１４，１５……過電流検出回路、９……負
荷、１０，１１……過電流垂下制御回路、１２，
１３……故障検出回路。
Figure 1 is a block diagram of a conventional uninterruptible power supply.
FIG. 2 is a block diagram of an uninterruptible power supply device showing one embodiment of the present invention. 1, 2... AC or DC power supply, 3, 4... AC stabilized power supply, 5, 6... High-speed shield breaker, 7,
8, 14, 15... Overcurrent detection circuit, 9... Load, 10, 11... Overcurrent droop control circuit, 12,
13... Failure detection circuit.
Claims (1)
周波数、位相が制御できるような交流を出力する
交流安定化電源と、過大な負荷電流に応動し前記
交流安定化電源の出力を０附近まで瞬時に低下さ
せる過電流垂下制御回路と、交流安定化電源の故
障を検出し前記交流安定化電源の出力を０附近ま
で瞬時に低下させる故障検出回路を備え、前記交
流安定化電源を少くとも２台、高速度しや断器を
介して並列接続しかつ並列接続点から引出される
共通母線を介して負荷に給電するようにした無停
電電源装置において、 前記共通母線に設けられる変流器の出力側にそ
れぞれ設けられる過電流検出回路と、この過電流
検出回路に、一方の交流安定化電源側の前記高速
度しや断器の開路条件で他方の交流安定化電源側
の前記過電流検出回路の検出レベルを低下させる
回路を設け、前記それぞれの過電流垂下制御回路
に前記それぞれの過電流検出回路の出力信号を印
加することを特徴とする無停電電源装置。[Claims] 1. An output voltage using an AC or DC power source as an input power source,
An AC stabilized power supply that outputs alternating current whose frequency and phase can be controlled, an overcurrent droop control circuit that instantly reduces the output of the AC stabilized power supply to near zero in response to excessive load current, and an AC stabilizer. A failure detection circuit is provided to detect a failure in the power supply and instantly reduce the output of the regulated AC power supply to around 0, and at least two of the regulated AC power supplies are connected in parallel via a high-speed disconnector. In an uninterruptible power supply device configured to supply power to a load via a common bus drawn out from a parallel connection point, an overcurrent detection circuit provided on the output side of a current transformer provided on the common bus, and an overcurrent detection circuit provided on the output side of a current transformer provided on the common bus; The current detection circuit is provided with a circuit that lowers the detection level of the overcurrent detection circuit on the other AC stabilized power supply side under the open circuit condition of the high speed circuit breaker on the one AC stabilized power supply side, and each of the above-mentioned An uninterruptible power supply characterized in that output signals of the respective overcurrent detection circuits are applied to an overcurrent droop control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63082242A JPS63290125A (en) | 1988-04-05 | 1988-04-05 | Uninterruptible power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63082242A JPS63290125A (en) | 1988-04-05 | 1988-04-05 | Uninterruptible power source |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2612379A Division JPS55120337A (en) | 1979-03-08 | 1979-03-08 | Nonnbreak power supply unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63290125A JPS63290125A (en) | 1988-11-28 |
| JPH053208B2 true JPH053208B2 (en) | 1993-01-14 |
Family
ID=13768947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63082242A Granted JPS63290125A (en) | 1988-04-05 | 1988-04-05 | Uninterruptible power source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63290125A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2695941B2 (en) * | 1989-09-22 | 1998-01-14 | 株式会社東芝 | Uninterruptible power system |
-
1988
- 1988-04-05 JP JP63082242A patent/JPS63290125A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63290125A (en) | 1988-11-28 |
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