JPH08223987A - Inverter control method for momentary power interruption - Google Patents
Inverter control method for momentary power interruptionInfo
- Publication number
- JPH08223987A JPH08223987A JP7023568A JP2356895A JPH08223987A JP H08223987 A JPH08223987 A JP H08223987A JP 7023568 A JP7023568 A JP 7023568A JP 2356895 A JP2356895 A JP 2356895A JP H08223987 A JPH08223987 A JP H08223987A
- Authority
- JP
- Japan
- Prior art keywords
- inverter
- level
- voltage
- power failure
- main circuit
- 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.)
- Granted
Links
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、誘導電動機駆動インバ
ータ装置の瞬停発生時における運転継続方法に係り、瞬
停時のインバータ制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous operation method for an induction motor drive inverter device when an instantaneous blackout occurs, and more particularly to an inverter control method for an instantaneous blackout.
【０００２】[0002]
【従来の技術】誘導電動機等の回転機を駆動するインバ
ータ装置において、インバータの運転中に停電が発生し
た場合は、運転を停止させて復電した後インバータを再
運転させていた。この場合インバータを再運転するため
に無駄な時間が生じ、このために設備全体としての運転
に支障を与える場合も発生しうる。2. Description of the Related Art In an inverter device for driving a rotating machine such as an induction motor, when a power failure occurs during operation of the inverter, the operation is stopped and the power is restored to restart the inverter. In this case, a waste of time is required to restart the inverter, which may hinder the operation of the entire equipment.
【０００３】[0003]
【発明が解決しようとする課題】インバータ装置で誘導
電動機を運転中に、停電を検出した場合、運転を一時停
止させて復電後に運転を再起動する方法が採られてい
る。この場合電動機の残留電圧が減衰するまで待機する
か、残留電圧と位相電圧を合わせてインバータを再起動
する必要がある。しかし、瞬時停電期間中は、インバー
タの運転は停止して電動機はフリーランの状態にあるた
め、電動機は制御されない。従ってできる限り運転が継
続されることが望まれる。When a power failure is detected while the induction motor is being operated by the inverter device, a method of temporarily stopping the operation and restarting the operation after power recovery is adopted. In this case, it is necessary to wait until the residual voltage of the motor decays or to restart the inverter by matching the residual voltage and the phase voltage. However, during the momentary power failure period, the operation of the inverter is stopped and the electric motor is in the free-run state, so the electric motor is not controlled. Therefore, it is desirable to continue the operation as much as possible.
【０００４】本発明は上記の点に鑑みてなされたもので
その目的は、瞬時停電期間中もインバータの運転を継続
し、復電時に安定して通常運転に移行することができる
瞬停時のインバータ制御方法を提供することにある。The present invention has been made in view of the above points, and an object thereof is to continue operation of an inverter even during a momentary power failure period and to stably shift to normal operation upon power restoration. It is to provide an inverter control method.
【０００５】[0005]
【課題を解決するための手段】本発明は、回転機負荷を
駆動するインバータの制御方法において、インバータの
主回路直流電圧の停止レベルよりも高く停電検出レベル
を設定し、該停電検出レベルよりも高く復電レベルを設
定し、インバータの出力周波数を一定とし、瞬時停電発
生により前記インバータの主回路直流電圧が前記停電検
出レベル以下になったときは、第１のクッション時間に
沿ってインバータの出力電圧を定格の数％程度に絞り込
み、復電時に前記インバータの主回路直流電圧が前記復
電レベル以上になったときは第２のクッション時間に沿
ってインバータの出力電圧を通常レベルに戻すように制
御することを特徴としている。According to the present invention, in a method of controlling an inverter for driving a load on a rotating machine, a power failure detection level is set higher than a stop level of a main circuit DC voltage of the inverter, and the power failure detection level is set higher than the power failure detection level. When the power recovery level is set high, the output frequency of the inverter is constant, and when the DC voltage of the main circuit of the inverter falls below the power failure detection level due to the occurrence of an instantaneous power failure, the output of the inverter is output along the first cushion time. When the main circuit DC voltage of the inverter becomes equal to or higher than the power recovery level when power is restored, the output voltage of the inverter is returned to the normal level along the second cushion time. It is characterized by controlling.
【０００６】[0006]
【作用】瞬時停電発生によりインバータの主回路直流電
圧が停電検出レベル以下になったら、インバータの出力
電圧は定格の数％程度に絞り込まれる。このためインバ
ータの主回路直流電圧の低下は最小限に抑制され、イン
バータの運転は継続される。このとき出力周波数は出力
電圧の変化とは無関係に一定であるので、電動機等の回
転機負荷の速度変化は最小限に抑えられる。またインバ
ータの出力電圧の絞り込みは第１のクッション時間に沿
って行われるので、過電流によりインバータの運転が停
止することはない。また復電時は第２のクッション時間
に沿ってインバータの出力電圧が通常レベルに戻される
ので、復電時に安定して通常運転に移行できる。When the DC voltage of the main circuit of the inverter falls below the power failure detection level due to the occurrence of an instantaneous power failure, the output voltage of the inverter is narrowed down to about several percent of the rated value. Therefore, the decrease in the DC voltage of the main circuit of the inverter is suppressed to the minimum, and the operation of the inverter is continued. At this time, the output frequency is constant irrespective of the change in the output voltage, so that the speed change of the load of the rotating machine such as the electric motor can be minimized. Further, since the output voltage of the inverter is narrowed down along the first cushion time, the operation of the inverter is not stopped by the overcurrent. Further, when the power is restored, the output voltage of the inverter is returned to the normal level along the second cushion time, so that it is possible to stably shift to the normal operation when the power is restored.
【０００７】[0007]
【実施例】以下、図面を参照しながら本発明の一実施例
を説明する。本発明は、インバータ装置の主回路直流電
圧（以下ＶDCと称する）を検出し、このＶDCを瞬時停電
時のインバータ制御に使用するものである。通常、イン
バータの運転中に、ＶDCが運転可能なレベル以下になる
と、運転を停止させ、電動機はフリーラン状態になる。
本発明では図１のタイムチャートに示すように、インバ
ータ停止レベル（ＶDC-Cという）より高いレベルに停電
検出レベル（ＶDC-Bという）を設定し、このＶDC-Bレベ
ル以下ではインバータの出力電圧制御を別途行うことに
した（瞬停時ＡＶＲという）。この瞬停時ＡＶＲによっ
て、ＶDCの低下は最小限に抑えられ、これによってイン
バータの運転継続が可能となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The present invention detects the DC voltage of the main circuit of the inverter device (hereinafter referred to as VDC ) and uses this VDC for inverter control during an instantaneous power failure. Normally, when V DC becomes lower than the operable level during the operation of the inverter, the operation is stopped and the electric motor is put into the free-run state.
As the present invention shown in the time chart of FIG. 1, to set the power failure detection level (called V DC-B) higher than the inverter stop level (called V DC-C) levels, below the V DC-B level inverter It decided to control the output voltage separately (called AVR during momentary power failure). Due to the AVR during this momentary power failure, the decrease in V DC is suppressed to a minimum, which allows the inverter to continue operating.
【０００８】瞬停時ＡＶＲの制御内容は以下のとおりで
ある。ＶDC（直流電圧）≦ＶDC-B（停電検出レベル）の
状態において、ＶDCの低下を最小に抑えるために、出力
電圧を定格の数％程度まで絞り込み、負荷側のエネルギ
ーを最小とする。このとき、出力周波数は出力電圧の変
化には無関係とし、インバータの指令値を維持して、電
動機の速度変化を最小限に抑えるよう働かせる。前記出
力電圧を絞り込む場合、クッション時間１を与えること
によって、インバータの過電流による運転停止を防ぐこ
とができる。復電時は、再びあるクッション時間２によ
って出力電圧を通常のレベルに戻すことによりインバー
タの安定な運転に移行することが可能となる。The control contents of the AVR at the momentary power failure are as follows. In the state of VDC (DC voltage) ≤ VDC-B (blackout detection level), in order to minimize the decrease of VDC , the output voltage is narrowed down to about several% of the rating to minimize the load side energy. . At this time, the output frequency is not related to the change in the output voltage, and the command value of the inverter is maintained so as to minimize the speed change of the electric motor. When the output voltage is narrowed down, by giving the cushion time 1, it is possible to prevent the operation stop due to the overcurrent of the inverter. At the time of power recovery, it is possible to shift to stable operation of the inverter by returning the output voltage to a normal level again by a certain cushion time 2.
【０００９】[0009]
【発明の効果】以上のように本発明によれば、回転機負
荷を駆動するインバータの制御方法において、インバー
タの主回路直流電圧の停止レベルよりも高く停電検出レ
ベルを設定し、該停電検出レベルよりも高く復電レベル
を設定し、インバータの出力周波数を一定とし、瞬時停
電発生により前記インバータの主回路直流電圧が前記停
電検出レベル以下になったときは、第１のクッション時
間に沿ってインバータの出力電圧を定格の数％程度に絞
り込み、復電時に前記インバータの主回路直流電圧が前
記復電レベル以上になったときは第２のクッション時間
に沿ってインバータの出力電圧を通常レベルに戻すよう
に制御するように構成したので、次のような優れた効果
が得られる。As described above, according to the present invention, in the control method of the inverter for driving the load of the rotating machine, the power failure detection level is set higher than the stop level of the DC voltage of the main circuit of the inverter, and the power failure detection level is set. When the main circuit DC voltage of the inverter falls below the power failure detection level due to the occurrence of an instantaneous power failure by setting the power recovery level higher than that of the inverter and the output frequency of the inverter is constant, the inverter is operated along the first cushion time. Output voltage is reduced to about several percent of the rated value, and when the main circuit DC voltage of the inverter becomes equal to or higher than the power recovery level during power recovery, the output voltage of the inverter is returned to the normal level along the second cushion time. Since the control is performed as described above, the following excellent effects can be obtained.
【００１０】（１）インバータ装置の主回路直流電圧Ｖ
DCの低下を最小限に抑えることができるので、瞬時停電
時間を従来よりも短くすることが可能となった。(1) DC voltage V of the main circuit of the inverter device
Since the DC drop can be minimized, it is possible to shorten the momentary power failure time than before.
【００１１】（２）瞬停時においても運転を継続し、出
力電圧の絞り込み、復帰をあるクッション時間をもって
行うため、復電時に安定に通常運転に移行することがで
きる。(2) Even during an instantaneous power failure, the operation is continued, the output voltage is narrowed down, and the recovery is performed with a certain cushion time, so that it is possible to stably shift to the normal operation when the power is restored.
【００１２】（３）瞬停時は、従来のように電動機の残
留電圧が減衰するまで待機するか、残留電圧と位相電圧
を合わせてインバータを再起動する必要はなくなる。こ
のため、瞬時停電期間中に電動機がフリーランの状態に
なることはない。(3) At the time of instantaneous power failure, it is not necessary to wait until the residual voltage of the electric motor is attenuated or to restart the inverter by matching the residual voltage and the phase voltage as in the conventional case. Therefore, the electric motor does not enter the free-run state during the momentary power failure period.
【図１】本発明の一実施例を示すタイムチャート。FIG. 1 is a time chart showing an embodiment of the present invention.
Claims (1)
方法において、 インバータの主回路直流電圧の停止レベルよりも高く停
電検出レベルを設定し、該停電検出レベルよりも高く復
電レベルを設定し、インバータの出力周波数を一定と
し、 瞬時停電発生により前記インバータの主回路直流電圧が
前記停電検出レベル以下になったときは、第１のクッシ
ョン時間に沿ってインバータの出力電圧を定格の数％程
度に絞り込み、 復電時に前記インバータの主回路直流電圧が前記復電レ
ベル以上になったときは第２のクッション時間に沿って
インバータの出力電圧を通常レベルに戻すように制御す
ることを特徴とする瞬停時のインバータ制御方法。1. A method of controlling an inverter for driving a rotating machine load, wherein a power failure detection level is set higher than a stop level of a main circuit DC voltage of the inverter, and a power recovery level is set higher than the power failure detection level. When the output frequency of the inverter is constant and the DC voltage of the main circuit of the inverter falls below the power failure detection level due to the occurrence of an instantaneous power failure, the output voltage of the inverter is reduced to about several percent of the rating along the first cushion time. When the main circuit DC voltage of the inverter is equal to or higher than the power recovery level during power recovery, the output voltage of the inverter is controlled to return to the normal level along the second cushion time. Inverter control method during stoppage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02356895A JP3435871B2 (en) | 1995-02-13 | 1995-02-13 | Inverter control method at momentary power failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02356895A JP3435871B2 (en) | 1995-02-13 | 1995-02-13 | Inverter control method at momentary power failure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08223987A true JPH08223987A (en) | 1996-08-30 |
| JP3435871B2 JP3435871B2 (en) | 2003-08-11 |
Family
ID=12114149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02356895A Expired - Lifetime JP3435871B2 (en) | 1995-02-13 | 1995-02-13 | Inverter control method at momentary power failure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3435871B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102891649A (en) * | 2011-07-20 | 2013-01-23 | Ls产电株式会社 | Apparatus and method for controlling medium voltage inverter |
-
1995
- 1995-02-13 JP JP02356895A patent/JP3435871B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102891649A (en) * | 2011-07-20 | 2013-01-23 | Ls产电株式会社 | Apparatus and method for controlling medium voltage inverter |
| JP2013027310A (en) * | 2011-07-20 | 2013-02-04 | Ls Industrial Systems Co Ltd | Apparatus for controlling high-voltage inverter |
| US9093892B2 (en) | 2011-07-20 | 2015-07-28 | Lsis Co., Ltd. | Apparatus and method for controlling medium voltage inverter |
| EP2549637A3 (en) * | 2011-07-20 | 2017-05-17 | LSIS Co., Ltd. | Apparatus and method for controlling medium voltage inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3435871B2 (en) | 2003-08-11 |
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