JPS63148880A - Control device for inverter in service interruption - Google Patents

Control device for inverter in service interruption

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Publication number
JPS63148880A
JPS63148880A JP61295182A JP29518286A JPS63148880A JP S63148880 A JPS63148880 A JP S63148880A JP 61295182 A JP61295182 A JP 61295182A JP 29518286 A JP29518286 A JP 29518286A JP S63148880 A JPS63148880 A JP S63148880A
Authority
JP
Japan
Prior art keywords
power outage
power
circuit
inverter
voltage
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.)
Pending
Application number
JP61295182A
Other languages
Japanese (ja)
Inventor
Shigeyuki Sugimoto
重幸 杉本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP61295182A priority Critical patent/JPS63148880A/en
Publication of JPS63148880A publication Critical patent/JPS63148880A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To expedite the stoppage of an inverter in power outage, by taking a control power source from DC bus voltage, starting decelertion regardless of how the operating condition is at the point of service interruption, and controlling its decelerating time in accordance with the then DC bus voltage value. CONSTITUTION:An inverter device is composed of a power rectification section 1, a smoothing capacitor 2 and a power inversion section 3 and drives an induction motor 4. This control circuit is composed of (i) a power outage detecting means 18 comprising a voltage detection circuit 5, a power outage reference voltage setter 6, a comparator 7 and a hold circuit 8, (ii) an inverter control means 17 comprising an output frequency command decision circuit 10, a PWM signal makeup circuit 11 and a power inversion section drive circuit 13, to which an operational mode decision circuit 15 and an accelerating and decelerating time decision circuit 16 are added. When the second power outage signal is inputted, the mode decision circuit 15 outputs a decelerating mode signal regardless of whether the mode is. The time decision circuit 16 adjusts the decelerating time constant in comparing the present DC bus voltage value with the predetermined upper- and lower limit reference voltage values.

Description

【発明の詳細な説明】 [産業上の利用分野〕 この発明は、停電時に、負荷電動機をすみやかに停止さ
せるためのインバータの停電時制御装置に関するもので
ある。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inverter power outage control device for promptly stopping a load motor in the event of a power outage.

[従来の技術] 従来、この種のインバータの停電時制御装置としては、
第3図に示すものがあった。図において、(1)は三相
交流電圧を脈流直流電圧に変換するインバータ装置の順
変換部、(2)は前記脈流直流電圧を平滑し滑らかな直
流母線電圧にするための平滑コンデンサ、(3)はこの
直流母線電圧を可変電圧、可変周波数の交流電圧に変換
する逆変換部、(4)はインバータの負荷である誘導電
動機、(5)は上記直流母線電圧を検出し、後述の比較
器(6)の許容入力電圧に合わせた電圧レベルまで分圧
して直流母線電圧信号として出力する電圧検出回路、(
6)は停電を判断するための基準電圧信号を設定する停
電基準電圧設定器、(7)は上記の直流母線電圧信号と
基準電圧信号を比較し、直流母線電圧信号が基準電圧信
号よりも低くなった時に第1の停電信号を出力する比較
器、(8)はこの第1の停電信号が一旦入力されたらそ
のまま保持し、第2の停電信号を出力するホールド回路
、(9)は目標速度指令と出力周波数指令を比較して運
転モード(加速、定常、減速)を決定する運転モード決
定回路、(10)はこの運転モード決定回路で決定され
た運転モードに応じ次に出力する周波数指令を決定する
出力周波数指令決定回路、(11)はこの出力周波数指
令よりPWM信号を計算し出力するPWM信号作成回路
、 (12)は上記第2の停電信号が入力された時のみ
上記PWM信号を遮断するPWM信号遮断回路、(13
)はこのPWM信号遮断回路(12)からのPWM信号
により逆変換部(3)のスイッチング素子をON、 O
FFする逆変換部駆動回路、 (14)は上記第2の停
電信号が入力されたときにのみ電動! (4)に機械的
なブレーキをかける機械式ブレーキ装置である。
[Prior art] Conventionally, as a power outage control device for this type of inverter,
There was one shown in Figure 3. In the figure, (1) is a forward conversion unit of an inverter device that converts three-phase AC voltage into pulsating DC voltage, (2) is a smoothing capacitor for smoothing the pulsating DC voltage to make a smooth DC bus voltage, (3) is an inverse conversion unit that converts this DC bus voltage into a variable voltage, variable frequency AC voltage, (4) is an induction motor that is the load of the inverter, and (5) is a unit that detects the DC bus voltage and A voltage detection circuit that divides the voltage to a voltage level matching the allowable input voltage of the comparator (6) and outputs it as a DC bus voltage signal, (
6) is a power failure reference voltage setting device that sets a reference voltage signal for determining a power outage, and (7) is a power failure reference voltage setting device that compares the above DC bus voltage signal and reference voltage signal, and determines whether the DC bus voltage signal is lower than the reference voltage signal. (8) is a hold circuit that holds this first power outage signal once input and outputs a second power outage signal. (9) is a hold circuit that outputs a second power outage signal. (9) is a hold circuit that outputs a second power outage signal. An operation mode determination circuit (10) determines the operation mode (acceleration, steady state, deceleration) by comparing the command and the output frequency command, and (10) determines the frequency command to be output next according to the operation mode determined by this operation mode determination circuit. (11) is a PWM signal creation circuit that calculates and outputs a PWM signal from this output frequency command; (12) cuts off the PWM signal only when the second power failure signal is input. PWM signal cutoff circuit (13
) turns ON and O the switching elements of the inverse conversion section (3) by the PWM signal from this PWM signal cutoff circuit (12).
The FF inverse converter drive circuit (14) is electrically operated only when the second power failure signal is input! (4) This is a mechanical brake device that applies a mechanical brake.

次に動作について説明する。通常の運転状態の時には、
まず、運転モード決定回路(9)が目標速度指令fiと
現在出力されている周波数指令f。を比較し、fa(f
xの時は加速モード、f、=fiの時は定常モード、f
o>fiの時は減速モードと判定し、運転モード指令を
出力する。この運転モード指令から、出力周波数指令決
定回路(10)がその加速・減速パターンに応じて次に
出力する周波数指令を計算し出力し、この出力周波数指
令を基にしPWM信号作成回路(11)がPWM信号を
計算し出力する。
Next, the operation will be explained. During normal operating conditions,
First, the driving mode determining circuit (9) determines the target speed command fi and the currently output frequency command f. and fa(f
When x, it is acceleration mode; when f, = fi, it is steady mode, f
When o>fi, it is determined that the mode is deceleration mode, and an operation mode command is output. From this operation mode command, the output frequency command determination circuit (10) calculates and outputs the next frequency command according to the acceleration/deceleration pattern, and based on this output frequency command, the PWM signal creation circuit (11) Calculates and outputs a PWM signal.

PWM信号遮断回路(12)は通常の運転時には動作し
ないので、PWM信号がそのまま出力され、逆変換部駆
動回路(13)がこのPWM信号によって逆変換部(3
)のスイッチング素子のON、 OFFを行う。
Since the PWM signal cutoff circuit (12) does not operate during normal operation, the PWM signal is output as is, and the inverse converter drive circuit (13) uses this PWM signal to shut down the inverse converter (3).
) turns on and off the switching elements.

次に、インバータ装置の入力電源が停電した時の回路の
動作について説明する。電圧検出回路(5)が常に直流
母線電圧を検出し、適当な電圧レベルまで分圧して、直
流母線電圧信号として出力し、比較器(7)が、停電基
準電圧設定器(6)により設定された基準電圧信号(通
常動作時の直流母線電圧レベルとインバータ装置の主回
路、制御回路等が正常に動作しなくなる直流母線電圧レ
ベルの間の適当な電圧レベルに設定する)と上記電圧検
出回路(5)により検出された直流母線電圧信号を比較
し、直流母線電圧信号が基準電圧信号よりも低くなった
時点で停電と判断し、第1の停電信号をホールド回路(
8)に出力する。ホールド回路(8)はこの第1の停電
信号を入力したら状態を変化し、その状態をそのまま保
持し第2の停電信号として。
Next, the operation of the circuit when the input power supply of the inverter device is interrupted will be explained. The voltage detection circuit (5) always detects the DC bus voltage, divides it to an appropriate voltage level, and outputs it as a DC bus voltage signal, and the comparator (7) detects the DC bus voltage set by the power outage reference voltage setter (6). The reference voltage signal (set to an appropriate voltage level between the DC bus voltage level during normal operation and the DC bus voltage level at which the main circuit, control circuit, etc. of the inverter device will not operate normally) and the voltage detection circuit ( 5), and when the DC bus voltage signal becomes lower than the reference voltage signal, it is determined that a power outage has occurred, and the first power outage signal is sent to the hold circuit (
8). When the hold circuit (8) receives this first power outage signal, it changes its state and holds that state as a second power outage signal.

PWM信号遮断回路(12)及び機械式ブレーキ装置(
14)に出力する。PWM信号遮断回路(12)に第2
の停電信号(2)が入力されるとPWM信号作成回路(
11)からのPWM信号が遮断され、機械式ブレーキ装
置(14)が誘導電動機(4)にブレーキをかけてこれ
を停止させる。この時、インバータ装置の出力が遮断さ
れると、誘導電動機(4)はフリーラン状態になり、そ
れの慣性が大きい場合には停止するまでにかなりの時間
を要するので1機械式ブレーキ装置(14)によって強
制的停止させる。
PWM signal cutoff circuit (12) and mechanical brake device (
14). The second PWM signal cutoff circuit (12)
When the power outage signal (2) is input, the PWM signal generation circuit (
The PWM signal from 11) is cut off, and the mechanical brake device (14) brakes the induction motor (4) to stop it. At this time, when the output of the inverter device is cut off, the induction motor (4) will be in a free-running state, and if its inertia is large, it will take a considerable amount of time to stop. ) to force a stop.

[発明が解決しようとする問題点コ 従来のインバータの停電時制御装置は以上のように構成
されているで、特に負荷電動機の慣性が大きい場合には
、停電後、負荷電動機が停止するまでにかなりの時間を
要し、用途によっては危険を伴うことがあった。そのた
め、このような場合には、外部に機械式ブレーキ装置を
取り付け、停電時に負荷電動機にブレーキをかけるよう
なシーケンスを組む必要があり、取付はスペースが大き
くなることや価格が高くなること、高速回転時には危険
があることなどの問題点があった。
[Problems to be Solved by the Invention] The conventional inverter power outage control device is configured as described above, and especially when the inertia of the load motor is large, the time required for the load motor to stop after a power outage is It took a considerable amount of time and could be dangerous depending on the application. Therefore, in such cases, it is necessary to install an external mechanical brake device and create a sequence that applies the brakes to the load motor during a power outage. There were problems such as being dangerous when rotating.

この発明は上記のような問題点を解消するためになされ
たもので、外部的な回路や機械式ブレーキを付加しなく
とも、停電時にモータを速やかに停止させることのでき
るインバータの停電時制御装置を得ることを目的とする
This invention was made to solve the above problems, and provides an inverter power outage control device that can quickly stop the motor in the event of a power outage without adding an external circuit or mechanical brake. The purpose is to obtain.

[問題点を解決するための手段] この発明に係るインバータの停電時制御装置は、インバ
ータの制御手段の電源を直流母線より採るようにし、停
電検出検出に応じ、その時の運転状態にかかわらず、減
速モードに切換えるとともに。
[Means for Solving the Problems] The inverter power outage control device according to the present invention is configured such that power for the inverter control means is taken from a DC bus, and in response to power outage detection, regardless of the operating state at that time. Along with switching to deceleration mode.

この減速モードに切換え後の指令周波数の減少時間を、
直流母線電圧に応じて制御するよう構成したものである
The reduction time of the command frequency after switching to this deceleration mode is
It is configured to be controlled according to the DC bus voltage.

[作 用] この発明におけるインバータの停電時制御装置は、イン
バータ装置の入力電源が停電を生じた時には、インバー
タは減速モードに切換えられ、出力周波数が低下してい
き、それによって、慣性で回転を続ける負荷電動機は発
電機となり、直流母線に直流電力が回生される。この直
流電力によってインバータの制御手段の電源が供給され
るとともに、その直流母線電圧の変動が検出され、その
検出電圧値の大小に応じてインバータの指令周波数の減
少時間、すなわち周波数低下速度を加減するよう制御さ
れる。それによって負荷電動機からの回生電力はほぼ一
定に保たれるとともに、負荷電動機は回生制動により速
やかに停止する。
[Function] In the power outage control device for an inverter according to the present invention, when a power outage occurs in the input power source of the inverter device, the inverter is switched to deceleration mode and the output frequency decreases, thereby causing rotation to be caused by inertia. The continuing load motor becomes a generator, and DC power is regenerated to the DC bus. This DC power supplies power to the control means of the inverter, and fluctuations in the DC bus voltage are detected, and the reduction time of the inverter's command frequency, that is, the rate of frequency decline, is adjusted depending on the magnitude of the detected voltage value. controlled like this. As a result, the regenerated power from the load motor is kept substantially constant, and the load motor is quickly stopped by regenerative braking.

[実施例] 以下、この発明の一実施例を図について説明する。第1
図はこの発明の1実施例を示す回路構成図で、図におい
て、(1)はインバータ装置の順変換部、(2)は平滑
コンデンサ、(3)は逆変換部、(4)は誘導電動機、
(5)は電圧検出回路、(6)は停電基準電圧設定器、
(7)は比較器、(8)はホールド回路、(10)は出
力周波数指令決定回路、(11)はPWM信号作成回路
、(13)は逆変換部駆動回路で、以上は第3図で示す
従来例と同様のものである。(15)は第3図の(9)
に相当する運転モード決定回路で。
[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a circuit configuration diagram showing one embodiment of the present invention. In the figure, (1) is a forward conversion section of an inverter device, (2) is a smoothing capacitor, (3) is an inverse conversion section, and (4) is an induction motor. ,
(5) is a voltage detection circuit, (6) is a power failure reference voltage setter,
(7) is a comparator, (8) is a hold circuit, (10) is an output frequency command determination circuit, (11) is a PWM signal generation circuit, and (13) is an inverse converter drive circuit. This is similar to the conventional example shown. (15) is (9) in Figure 3
In the driving mode determination circuit corresponding to .

通常の運転状態の時には従来例と同様に目標速度指令と
出力周波数指令を比較して運転モード(加速、定常、減
速)を決定するが、ホールド回路(9)からの第2の停
電信号が入力された時には、その時の運転モードにかか
わらず減速モード信号を出力する。(16)は通常は外
部で設定された加速時間。
During normal operating conditions, the target speed command and output frequency command are compared to determine the operating mode (acceleration, steady state, deceleration) as in the conventional example, but the second power outage signal from the hold circuit (9) is input. When this occurs, a deceleration mode signal is output regardless of the operating mode at that time. (16) is normally an acceleration time set externally.

減速時間をそのまま出力周波数決定回路(10)に出力
するが、ホールド回路(9)からの第2の停電信号が入
力された時には、電圧検出回路(5)から入力される現
在の直流母線電圧値とあらかじめ設定された上限基準電
圧値及び下限基準電気値とを比較し、直流母線電圧値が
上限値より高い場合には設定減速時間を初期設定値から
除々に長くし、直流母線電圧値が下限値より低い場合に
は設定減速時間を除々に短かくするようにして、停電時
の設定減速時間を決定する加減速時間決定回路である。
The deceleration time is output as is to the output frequency determining circuit (10), but when the second power outage signal from the hold circuit (9) is input, the current DC bus voltage value input from the voltage detection circuit (5) is is compared with the preset upper limit reference voltage value and lower limit reference electrical value, and if the DC bus voltage value is higher than the upper limit value, the set deceleration time is gradually increased from the initial setting value, and the DC bus voltage value is set to the lower limit value. This acceleration/deceleration time determination circuit determines the set deceleration time at the time of a power outage by gradually shortening the set deceleration time if it is lower than the value.

なお、(17)は、出力周波数指令決定回路(10)、
PWM信号作成回路(11)、逆変換部駆動回路(13
)、運転モード決定回路(15)及び加減速時間決定回
路(16)からなるインバータ制御手段、(18)は、
電圧検出回路(5)、停電基準電圧設定器(6)、比較
器(7)及びホールド回路(8)からなる停電検出手段
、(19)は、電圧検出回路(5)及びホールド回路(
8)から減速時間決定回路(16)への入力回路と、ホ
ールド回路(8)から運転モード決定回路(15)への
入力回路からなる停電時停止手段である。
Note that (17) is the output frequency command determining circuit (10),
PWM signal generation circuit (11), inverse conversion unit drive circuit (13)
), an inverter control means (18) consisting of an operation mode determining circuit (15) and an acceleration/deceleration time determining circuit (16),
Power outage detection means (19) consists of a voltage detection circuit (5), a power outage reference voltage setter (6), a comparator (7) and a hold circuit (8);
8) to the deceleration time determining circuit (16), and an input circuit from the hold circuit (8) to the operation mode determining circuit (15).

次に、停電時における動作を説明する。まず。Next, the operation during a power outage will be explained. first.

停電の発生により、第3図と同様に動作し、比較器(7
)から第1の停電信号が出力され、その第1の停電信号
がホールド回路(8)に一旦入力されると、その状態が
そのまま保持され第2の停電信号が出力され、それが運
転モード決定回路(15)及び加減速時間決定回路(1
6)に入力される。運転モード決定回路(15)は、通
常は目標速度指令(外部にて設定)と出力周波数指令の
比較により、その時の運転モード(加速、減速、定常)
を決定し、出力しているが、上記第2の停電信号が入力
されると、その時の運転モード(加速、減速、定常)に
かかわらず、減速モード信号を出力する。一方、加減速
時間決定回路(16)は、通常は外部で設定された加速
時間、減速時間をそのまま出力周波数指令決定回路(l
O)に出力するが、上記第2の停電信号が入力されると
、上記電圧検出回路(5)からの現在の直流母線電圧信
号とあらかじめ設定された上限基準電圧値及び下限基準
電圧値とを比較し、直流母線電圧信号が上限値より高い
場合には設定減速時間を初期設定値(例えば外部で設定
された減速時間)から除々に長くシ、直流母1iA電圧
信号が下限値より低い場合には設定減速時間を除々に短
かくするようにして、停電時の設定減速時間を決定し出
力周波数指令決定回路(10)に出力する。この出力を
入力した出力周波数指令決定回路(10)は、この加減
速時間決定回!(16)から入力される設定減速時間デ
ータ(通常の運転状態の時には加速、減速時間データ)
に基づいて、次に出力すべき出力周波数指令を計算し、
PWM信号作成回路(11)に出力する。
When a power outage occurs, the comparator (7) operates in the same way as shown in Figure 3.
) outputs a first power outage signal, and once that first power outage signal is input to the hold circuit (8), that state is held as it is and a second power outage signal is output, which determines the operation mode. Circuit (15) and acceleration/deceleration time determination circuit (1
6). The operation mode determination circuit (15) usually determines the current operation mode (acceleration, deceleration, steady state) by comparing the target speed command (set externally) and the output frequency command.
However, when the second power outage signal is input, a deceleration mode signal is output regardless of the operating mode (acceleration, deceleration, steady state) at that time. On the other hand, the acceleration/deceleration time determination circuit (16) normally uses the output frequency command determination circuit (l) to maintain the acceleration time and deceleration time set externally.
However, when the second power outage signal is input, the current DC bus voltage signal from the voltage detection circuit (5) and the preset upper limit reference voltage value and lower limit reference voltage value are output to O). When the DC bus voltage signal is higher than the upper limit value, the set deceleration time is gradually increased from the initial setting value (for example, the deceleration time set externally), and when the DC bus voltage signal is lower than the lower limit value, the set deceleration time is gradually increased. determines the set deceleration time at the time of power outage by gradually shortening the set deceleration time and outputs it to the output frequency command determining circuit (10). The output frequency command determining circuit (10) that receives this output determines this acceleration/deceleration time! Set deceleration time data input from (16) (acceleration and deceleration time data in normal operating conditions)
Based on this, calculate the output frequency command to be output next,
Output to the PWM signal generation circuit (11).

第3図は、この時のインバータ装置の入力電圧、出力層
波数指令及び直流母線電圧の様子を示したタイムチャー
トである0図において、(20)はインバータ装置の入
力電圧の変化を、(21)は出力周波数指令の変化を、
(22)は直流母線電圧の変化を示す。図の(a)の時
点で停電が生じたとすると、直流母m電圧(22)は図
のように主回路の時定数に従って減少し始める。さらに
、(b)の時点で直流母線電圧(22)が基準電圧レベ
ルより低くなると、前述のように比較器(7)から第1
の停電信号が出力され、これがホールド回路(8)によ
り保持されて、第2の停電信号として出力される。この
第2の停電信号が運転モード決定回路(15)と加減速
時間決定回路(16)に入力されることによって、運転
モード決定回路(15)から減速モード信号が出力され
、出力周波数指令決定回路(10)は減速処理を始める
ため、出力周波数指令(18)は(b)の時点から低下
し始める。この時、減速することにより、誘動電動機か
らインバータ装置に対して電力が回生されるので、直流
母線電圧(22)がこれ以上低下することを防ぐことに
なる。さらに、加減速時間決定回路(16)は、上記第
2の停電信号が入力されると、電圧検出回路(5)から
の直流母線電圧信号とあらかじめ設定された上限値、下
限値と比較し、例えば第2図のc−d間のように直流母
線電圧が上限値より高い間は減速時間を除々に長くして
行き、d点で上限値より低くなった時点で定速度で減速
する。逆に、例えば第3図のe−f間のように直流母線
電圧が下限値より低い間は減速時間を除々に短かくして
行き、f点で下限値より高くなった時点で定速度で減速
するようにする。回生電力量は減速時間に関係する(減
速時間が短かくなるほど回生電力量は大きくなる)ので
、上記のような方法で、上限値と下限値を必要な直流母
線電圧値を中心に適当な幅をとって設定しておけば、回
生電力量は自動的に調整され、直流母線電圧(22)を
停電時でも第3図のようにほぼ一定に保つ(ある幅の範
囲内に保つ)ことができ、出力周波数指令(18)が零
となるまで、すなわち、負荷電動機(4)が停止するま
で減速を続けることができる。
Figure 3 is a time chart showing the input voltage, output layer wave number command, and DC bus voltage of the inverter at this time. ) is the change in output frequency command,
(22) shows the change in DC bus voltage. If a power outage occurs at point (a) in the figure, the DC bus m voltage (22) begins to decrease according to the time constant of the main circuit as shown in the figure. Furthermore, when the DC bus voltage (22) becomes lower than the reference voltage level at the point in time (b), the comparator (7)
A power outage signal is output, held by a hold circuit (8), and output as a second power outage signal. By inputting this second power outage signal to the operation mode determination circuit (15) and the acceleration/deceleration time determination circuit (16), a deceleration mode signal is output from the operation mode determination circuit (15), and the output frequency command determination circuit Since (10) starts the deceleration process, the output frequency command (18) starts to decrease from the point in time (b). At this time, by decelerating, power is regenerated from the induction motor to the inverter device, thereby preventing the DC bus voltage (22) from further decreasing. Furthermore, when the second power outage signal is input, the acceleration/deceleration time determining circuit (16) compares the DC bus voltage signal from the voltage detection circuit (5) with preset upper and lower limit values, For example, while the DC bus voltage is higher than the upper limit value, as shown between c and d in FIG. 2, the deceleration time is gradually increased, and when the voltage becomes lower than the upper limit value at point d, the speed is decelerated at a constant speed. Conversely, while the DC bus voltage is lower than the lower limit value, such as between e and f in Figure 3, the deceleration time is gradually shortened, and when it becomes higher than the lower limit value at point f, the speed is decelerated at a constant speed. do it like this. Since the amount of regenerated electric power is related to the deceleration time (the shorter the deceleration time, the greater the amount of regenerated electric power), use the method described above to set the upper and lower limits to an appropriate range around the required DC bus voltage value. If you set this, the amount of regenerated electricity will be automatically adjusted, and the DC bus voltage (22) can be kept almost constant (within a certain range) even during a power outage, as shown in Figure 3. The deceleration can be continued until the output frequency command (18) becomes zero, that is, until the load motor (4) stops.

なお、上記実施例では、停電を検出するための手段とし
て、直流母線電圧値を検出するものを示したが、インバ
ータ装置の順変換部の入力三相交流電源のうちの一相分
電圧値やインバータ装置の逆変換部の出力電圧のうちの
一相分の電圧ピーク値を検出するようにしてもよい。
In the above embodiment, a method for detecting the DC bus voltage value was shown as a means for detecting a power outage, but the voltage value of one phase of the input three-phase AC power supply of the forward conversion section of the inverter device, The voltage peak value of one phase of the output voltage of the inverse converter of the inverter device may be detected.

また、以上の実施例では、インバータ装置として順変換
部をもつ、すなわち入力電源が交流電源であるものにつ
いて述べたが、順変換部の無い、入力電源が直流電源で
あるインバータ装置についても、この発明が適用し得る
ことは明らかである。
Furthermore, in the above embodiments, the inverter device has a forward conversion section, that is, the input power source is an AC power source, but this also applies to an inverter device that does not have a forward conversion section and whose input power source is a DC power source. It is clear that the invention is applicable.

[発明の効果コ 以上のように、この発明によれば、制御電源を直流母線
電圧からとるようにし、停電を検出した時点でその時の
運転状態にかかわらず減速を始め、その減速時間を、そ
の時の直流母線電圧値に応じて制御するようにしたので
、負荷電動機からの回生電力がほぼ一定となるようにす
ることで、直流母線電圧をほぼ一定に保ち、外部的な回
路や機械式ブレーキを付加しなくとも、停電時に、負荷
電動機をすみやかに停止させることができる効果がある
[Effects of the Invention] As described above, according to the present invention, the control power source is derived from the DC bus voltage, and when a power outage is detected, deceleration is started regardless of the operating state at that time, and the deceleration time is Since the control is made according to the DC bus voltage value of the load motor, the regenerative power from the load motor is kept almost constant, so the DC bus voltage is kept almost constant, and external circuits and mechanical brakes can be controlled. Even without adding it, there is an effect that the load motor can be stopped quickly in the event of a power outage.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例を示す回路構成図、第2図
はこの実施例によるインバータ装置の入力電圧、出力周
波数及び直流母線電圧の関係を示すタイムチャート、第
3図は従来のインバータの停電時制御装置の構成を示す
回路構成図である。 図において、(1)は順変換部、(2)は平滑コンデン
サ、(3)は逆変換部、(4)は誘導電動機(負荷電動
V&)、(5)は電圧検出回路、(6)は停電基準電圧
設定器、(7)は比較器、(8)はホールド回路、(1
0)は出力周波数指令決定回路、 (11)はPWM信
号作成回路、(13)は逆変換部駆動回路、(15)は
運転モード決定回路、(16)は加減速時間決定回路、
(17)はインバータ制御手段、 (18)は停電検出
手段。 (19)は停電時停止手段である。 なお1図中同一筒号は同−或は相当部分を示す。
Fig. 1 is a circuit configuration diagram showing an embodiment of the present invention, Fig. 2 is a time chart showing the relationship among the input voltage, output frequency, and DC bus voltage of the inverter device according to this embodiment, and Fig. 3 is a diagram of a conventional inverter device. FIG. 2 is a circuit configuration diagram showing the configuration of a power outage control device. In the figure, (1) is a forward conversion section, (2) is a smoothing capacitor, (3) is an inverse conversion section, (4) is an induction motor (load motor V&), (5) is a voltage detection circuit, and (6) is a Power failure reference voltage setter, (7) is a comparator, (8) is a hold circuit, (1)
0) is an output frequency command determination circuit, (11) is a PWM signal generation circuit, (13) is an inverse conversion unit drive circuit, (15) is an operation mode determination circuit, (16) is an acceleration/deceleration time determination circuit,
(17) is an inverter control means, and (18) is a power failure detection means. (19) is means for stopping at power outage. Note that the same cylinder numbers in Figure 1 indicate the same or equivalent parts.

Claims (5)

【特許請求の範囲】[Claims] (1)直流電源電力又は交流電源電力を順変換部により
変換した直流電力を平滑用コンデンサで平滑し、逆変換
部によって可変周波数、可変電圧の交流電力に変換し、
負荷電動機を駆動するようにしたインバータ装置で、上
記負荷電動機の加速、定常、減速の運転モードに応じた
周波数指令のPWM信号で駆動するインバータ制御手段
と、上記直流電源又は交流電源の停電を検出する停電検
出手段と、そして、この停電検出手段による停電検出に
応じ上記電動機を停止するよう上記インバータ制御手段
を制御する停電時停止手段とを備えたインバータの停電
時制御装置において、上記インバータ制御手段の電源を
上記平滑コンデンサから上記逆変換部に印加される直流
母線電圧からとるようにし、上記停電時停止手段を、上
記停電検出手段による停電検出に応じ上記運転モードを
減速モードに切換えるとともに、この減速モードに切換
え後の指令周波数の減少時間を上記直流母線電圧に応じ
て制御する構成としたことを特徴とするインバータの停
電時制御装置。
(1) DC power obtained by converting DC power or AC power by a forward conversion unit is smoothed by a smoothing capacitor, and converted to variable frequency, variable voltage AC power by an inverse conversion unit,
An inverter device configured to drive a load motor, and an inverter control means driven by a PWM signal of a frequency command corresponding to an acceleration, steady state, or deceleration operation mode of the load motor, and detecting a power outage of the DC power supply or AC power supply. In the inverter power outage control device, the inverter power outage control device comprises a power outage detection means for detecting a power outage, and a power outage stopping means for controlling the inverter control means to stop the electric motor in response to a power outage detected by the power outage detection means. The power supply is taken from the DC bus voltage applied from the smoothing capacitor to the inverse converter, and the power failure stopping means switches the operation mode to a deceleration mode in response to the power failure detection by the power failure detection means. A power outage control device for an inverter, characterized in that it is configured to control the reduction time of the command frequency after switching to the deceleration mode in accordance with the DC bus voltage.
(2)上記インバータ制御手段を、目標速度指令、出力
周波数指令等に応じて加速、定常、減速の運転モードを
決定する運転モード決定回路、この運転モード決定回路
の出力に応じて出力周波数指令及びそれの時間経過に対
する変化を決定する出力周波数指令決定回路、この出力
周波数指令決定回路の出力に応じて上記逆変換部を駆動
するためのPWM信号を作成するPWM信号作成回路、
及び上記出力周波数指令決定回路の加減速時間を設定す
る加減速時間設定回路を備えた構成とし、上記停電時停
止手段を、上記停電検出手段による停電検出に応じ、上
記運転モード決定回路を、その時の運転状態の如何に関
わらず、減速モードに切換え、上記加減速時間設定回路
の減速時間を、外部設定の如何に関わらず、上記直流母
線電圧が予め定めた上限値より大なる時は所定値より長
く、予め定めた下限値より小なる時は所定値より短くす
るよう切換える構成としたことを特徴とする特許請求の
範囲第1項記載のインバータの停電時制御装置。
(2) An operation mode determination circuit that determines the operation mode of acceleration, steady state, and deceleration according to a target speed command, an output frequency command, etc., and an output frequency command and an output frequency command and an output frequency command determination circuit that determines the change over time; a PWM signal creation circuit that creates a PWM signal for driving the inverse conversion section according to the output of the output frequency command determination circuit;
and an acceleration/deceleration time setting circuit for setting the acceleration/deceleration time of the output frequency command determining circuit, and the power failure stopping means is configured to control the operation mode determining circuit in response to the power failure detection by the power failure detection means. Regardless of the operating state, the deceleration mode is switched to the deceleration mode, and the deceleration time of the acceleration/deceleration time setting circuit is set to a predetermined value when the DC bus voltage is greater than the predetermined upper limit, regardless of external settings. 2. The inverter power outage control device according to claim 1, wherein when the length is longer than a predetermined lower limit value, the inverter is switched to be shorter than a predetermined value.
(3)上記停電検出手段を、上記直流母線電圧を検出す
る電圧検出回路、この電圧検出回路の検出電圧を所定電
圧値と比較し、この検出電圧が所定電圧値以下の時第1
の停電信号を出力する比較回路、及びこの比較回路が一
旦第1の停電信号を出力するとこの状態を保持し、第2
の停電信号を出力し続けるホールド回路からなるよう構
成した特許請求の範囲第1又は第2項記載のインバータ
の停電時制御装置。
(3) The power failure detection means includes a voltage detection circuit that detects the DC bus voltage, and compares the detected voltage of this voltage detection circuit with a predetermined voltage value, and when the detected voltage is less than the predetermined voltage value, a first
a comparator circuit that outputs a power outage signal, and once this comparator circuit outputs a first power outage signal, it maintains this state and outputs a second power outage signal.
An inverter power outage control device according to claim 1 or 2, comprising a hold circuit that continues to output a power outage signal.
(4)上記停電検出手段を、上記順変換部への入力交流
電源の交流電圧を検出し、この検出電圧値が所定電圧値
以下となることにより停電信号を出力するよう構成した
特許請求の範囲第1又は第2項記載のインバータの停電
時制御装置。
(4) The power outage detection means is configured to detect the AC voltage of the input AC power supply to the forward conversion unit, and output a power outage signal when the detected voltage value becomes equal to or less than a predetermined voltage value. A power outage control device for an inverter according to item 1 or 2.
(5)上記停電検出手段を、上記逆変換部の出力交流電
圧を検出し、この検出出力電圧値のピーク値が所定電圧
値以下となることにより停電信号を出力するよう構成し
た特許請求の範囲第1又は第2項記載のインバータの停
電時制御装置。
(5) The power outage detection means is configured to detect the output AC voltage of the inverse converter and output a power outage signal when the peak value of the detected output voltage value becomes equal to or less than a predetermined voltage value. A power outage control device for an inverter according to item 1 or 2.
JP61295182A 1986-12-11 1986-12-11 Control device for inverter in service interruption Pending JPS63148880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61295182A JPS63148880A (en) 1986-12-11 1986-12-11 Control device for inverter in service interruption

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61295182A JPS63148880A (en) 1986-12-11 1986-12-11 Control device for inverter in service interruption

Publications (1)

Publication Number Publication Date
JPS63148880A true JPS63148880A (en) 1988-06-21

Family

ID=17817277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61295182A Pending JPS63148880A (en) 1986-12-11 1986-12-11 Control device for inverter in service interruption

Country Status (1)

Country Link
JP (1) JPS63148880A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007068332A (en) * 2005-08-03 2007-03-15 Yaskawa Electric Corp Control method of ac motor, and inverter device
EP2549637A3 (en) * 2011-07-20 2017-05-17 LSIS Co., Ltd. Apparatus and method for controlling medium voltage inverter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007068332A (en) * 2005-08-03 2007-03-15 Yaskawa Electric Corp Control method of ac motor, and inverter device
EP2549637A3 (en) * 2011-07-20 2017-05-17 LSIS Co., Ltd. Apparatus and method for controlling medium voltage inverter

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