JP2006074904A - Protective device for alternating current-alternating current direct converter - Google Patents

Protective device for alternating current-alternating current direct converter Download PDF

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JP2006074904A
JP2006074904A JP2004255103A JP2004255103A JP2006074904A JP 2006074904 A JP2006074904 A JP 2006074904A JP 2004255103 A JP2004255103 A JP 2004255103A JP 2004255103 A JP2004255103 A JP 2004255103A JP 2006074904 A JP2006074904 A JP 2006074904A
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power supply
direct converter
voltage
supply voltage
alternating current
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JP4609634B2 (en
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Hideki Oguchi
英樹 大口
Ikuya Sato
以久也 佐藤
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Fuji Electric Co Ltd
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Fuji Electric Holdings Ltd
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<P>PROBLEM TO BE SOLVED: To provide a protective device for an alternating current-alternating current direct converter that is capable of detecting a power failure such as service interruption without the use of a supply voltage drop detector circuit and performing protecting operation without fail even if a service interruption occurs while regenerative operation is performed. <P>SOLUTION: The alternating current-alternating current direct converter converts a polyphase alternating-current voltage into a polyphase alternating-current voltage of an arbitrary magnitude and frequency. The alternating current-alternating current direct converter includes: a supply voltage detecting means 200 that detects an instantaneous value of a supply voltage; a computing means 201 that computes the magnitude of a supply voltage vector from its output; a power failure detecting means 202 that compares the computed magnitude of a supply voltage vector with a reference value of a voltage drop and a reference value of a voltage rise to detect a power failure; and a means for stopping the operation of the alternating current-alternating current direct converter 3 according to a failure detection signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、多相交流電圧を任意の大きさ及び周波数を有する多相交流電圧に変換する交流−交流直接変換器の保護装置に関し、特に電源電圧の異常を検出して前記直接変換器の半導体スイッチング素子等を保護するための保護装置に関する。   The present invention relates to a protection device for an AC-AC direct converter that converts a polyphase AC voltage into a polyphase AC voltage having an arbitrary magnitude and frequency, and in particular, detects an abnormality in a power supply voltage to detect a semiconductor of the direct converter. The present invention relates to a protection device for protecting switching elements and the like.

図３は、交流−交流直接変換器及びその制御装置を、保護装置と共に示した構成図であり、多相交流として一般的な三相の場合を表している。
図３において、１は交流電源、４はリアクトル４１及びコンデンサ４２からなる入力フィルタ、３はマトリクスコンバータ等の交流−交流直接変換器、２は交流電動機等の負荷、１００は直接変換器３の半導体スイッチング素子に対するＰＷＭ信号（駆動パルス）を作成するＰＷＭ信号作成手段、１０２は電圧指令等の制御信号を作成する制御信号作成手段、１０１は電源電圧の低下や停電を検出してＰＷＭ信号作成手段１００に異常検出信号を送出する電源異常検出手段である。 FIG. 3 is a configuration diagram showing an AC-AC direct converter and its control device together with a protection device, and shows a general three-phase case as a multi-phase AC.
In FIG. 3, 1 is an AC power source, 4 is an input filter composed of a reactor 41 and a capacitor 42, 3 is an AC-AC direct converter such as a matrix converter, 2 is a load such as an AC motor, and 100 is a semiconductor of the direct converter 3. PWM signal generating means for generating a PWM signal (driving pulse) for the switching element, 102 is a control signal generating means for generating a control signal such as a voltage command, and 101 is a PWM signal generating means 100 by detecting a drop in power supply voltage or a power failure. Power supply abnormality detection means for sending an abnormality detection signal to the power supply.

また、交流−交流直接変換器３を保護する保護装置は、直接変換器３の入出力側相互間に接続される保護回路１０と、電圧検出手段１２及びゲート信号作成手段１３から構成されている。
保護回路１０は、ダイオードブリッジ２０ａ，２０ｂと、直流中間回路に接続されたコンデンサ１４と、その両端に接続された抵抗１５及び半導体スイッチング素子１６の直列回路とからなっており、前記コンデンサ１４の電圧は電圧検出手段１２に入力され、ゲート信号作成手段１３から出力されるゲート信号によってスイッチング素子１６を駆動するように構成されている。 The protection device for protecting the AC / AC direct converter 3 includes a protection circuit 10 connected between the input and output sides of the direct converter 3, a voltage detection unit 12, and a gate signal creation unit 13. .
The protection circuit 10 includes diode bridges 20a and 20b, a capacitor 14 connected to a direct current intermediate circuit, a series circuit of a resistor 15 and a semiconductor switching element 16 connected to both ends thereof, and the voltage of the capacitor 14 Is input to the voltage detection means 12 and is configured to drive the switching element 16 by the gate signal output from the gate signal creation means 13.

次に、この従来技術の動作を説明する。
交流電源１が正常時の通常動作では、交流−交流直接変換器３の各半導体スイッチング素子はＰＷＭ信号作成手段１００によってそのオン・オフが制御され、三相交流電圧を任意の大きさ及び周波数の三相交流電圧に変換して電源１から負荷２に電力を供給し、あるいは、負荷２から電源１へ電力を回生する。 Next, the operation of this prior art will be described.
In the normal operation when the AC power supply 1 is normal, each semiconductor switching element of the AC-AC direct converter 3 is controlled to be turned on / off by the PWM signal generating means 100, and the three-phase AC voltage is converted to an arbitrary magnitude and frequency. The power is supplied from the power source 1 to the load 2 after being converted into a three-phase AC voltage, or the power is regenerated from the load 2 to the power source 1.

交流電源１の異常時における保護動作は以下の通りである。
電源異常検出手段１０１が電源電圧の低下を検出すると、ＰＷＭ信号作成手段１００に異常検出信号が送出される。ＰＷＭ信号作成手段１００からは、電源１と負荷２とを電気的に切り離すためにオフ信号が出力され、交流−交流直接変換器３の半導体スイッチング素子は全てオフ（以下、全ゲート遮断という）する。 The protection operation when the AC power supply 1 is abnormal is as follows.
When the power supply abnormality detection means 101 detects a drop in the power supply voltage, an abnormality detection signal is sent to the PWM signal creation means 100. The PWM signal generation means 100 outputs an off signal to electrically disconnect the power source 1 and the load 2 and all the semiconductor switching elements of the AC-AC direct converter 3 are turned off (hereinafter referred to as all gate cutoff). .

その際、入力フィルタ４のリアクトル４１や負荷２の内部のインダクタンス等に蓄積されたエネルギーは、交流−交流直接変換器３の入出力側に接続されたダイオードブリッジ２０ａや２０ｂを介してコンデンサ１４へ放出されるため、コンデンサ１４の電圧が上昇する。
電圧検出手段１２は、コンデンサ１４の電圧がある一定値にまで上昇したことを検出してゲート信号作成手段１３へ異常電圧発生信号を出力し、ゲート信号作成手段１３から出力されるゲート信号によりスイッチング素子１６は導通状態となる。
スイッチング素子１６が導通すると、コンデンサ１４に蓄積されたエネルギーは抵抗１５により消費されるため、前述したインダクタンス等の蓄積エネルギーによる異常電圧が交流−交流直接変換器３のスイッチング素子に印加されるのを防ぎ、これらの破損を防止する。 At that time, the energy accumulated in the reactor 41 of the input filter 4 and the inductance inside the load 2 is transferred to the capacitor 14 via the diode bridges 20a and 20b connected to the input / output side of the AC-AC direct converter 3. Since it is discharged, the voltage of the capacitor 14 increases.
The voltage detection means 12 detects that the voltage of the capacitor 14 has increased to a certain value, outputs an abnormal voltage generation signal to the gate signal creation means 13, and performs switching according to the gate signal output from the gate signal creation means 13. The element 16 becomes conductive.
When the switching element 16 is turned on, the energy stored in the capacitor 14 is consumed by the resistor 15, so that the abnormal voltage due to the stored energy such as the inductance is applied to the switching element of the AC-AC direct converter 3. Prevent and prevent these breakage.

また、交流電源１の停電時における動作も上記と同様であり、停電を検出した電源異常検出手段１０１からの異常検出信号がＰＷＭ信号作成手段１００へ出力され、全ゲート遮断を行うと共に、上述した保護回路１０による保護動作が実行される。   The operation at the time of power failure of the AC power supply 1 is also the same as described above, and the abnormality detection signal from the power failure detection means 101 that detected the power failure is output to the PWM signal creation means 100, and all the gates are cut off. The protection operation by the protection circuit 10 is executed.

ここで、下記の特許文献１には、瞬時停電により電源電圧が低下した場合のＰＷＭサイクロコンバータの保護装置及び保護方法が開示されている。
すなわち、この従来技術では、電源電圧を監視して瞬時停電を検出すると、電源電圧の大小関係等に応じてフィルタのエネルギーを負荷へ供給したり、負荷のエネルギーをフィルタへ回生する。その後、負荷電流がゼロになると、全ゲート遮断を行ってサイクロコンバータの動作を停止している。 Here, Patent Document 1 below discloses a protection device and a protection method for a PWM cycloconverter when a power supply voltage is reduced due to an instantaneous power failure.
That is, in this prior art, when an instantaneous power failure is detected by monitoring the power supply voltage, the energy of the filter is supplied to the load or the energy of the load is regenerated to the filter according to the magnitude relationship of the power supply voltage. After that, when the load current becomes zero, all the gates are cut off and the operation of the cycloconverter is stopped.

図４は、特許文献１の図２に記載されているものと実質的に同一の電源電圧低下検出回路である。図４において、３３は三相の電源電圧を全波整流する全波整流回路、３０はその直流出力側に接続された平滑用のコンデンサ、３１，３２は分圧用の抵抗、３００は抵抗３１，３２による分圧値と停電検出基準電圧とを比較する電圧比較手段である。
この電源電圧低下検出回路では、電源電圧を整流平滑してから分圧し、その分圧値が停電検出基準電圧より低下したことを電圧検出手段３００により検出して停電検出信号を出力する。
前述した図３の電源異常検出手段１０１は、図４に示したような電源電圧低下検出回路により構成することができる。 FIG. 4 shows a power supply voltage drop detection circuit that is substantially the same as that described in FIG. In FIG. 4, 33 is a full-wave rectifier circuit for full-wave rectification of a three-phase power supply voltage, 30 is a smoothing capacitor connected to the DC output side, 31 and 32 are voltage dividing resistors, 300 is a resistor 31, 32 is a voltage comparison means for comparing the divided voltage value by 32 with the power failure detection reference voltage.
In this power supply voltage drop detection circuit, the power supply voltage is rectified and smoothed and then divided, and the voltage detection means 300 detects that the divided value has dropped below the power failure detection reference voltage and outputs a power failure detection signal.
3 described above can be configured by a power supply voltage drop detection circuit as shown in FIG.

特開２００１−８６７５１号公報（段落［０００７］〜［００１５］、図１、図２、図６、図７等）JP 2001-86751 A (paragraphs [0007] to [0015], FIG. 1, FIG. 2, FIG. 6, FIG. 7, etc.)

しかしながら、停電検出のために図４に示したような電源電圧低下検出回路を別個設けることは、コスト高の原因になる。
また、図４において、全波整流回路３３により整流された電圧はコンデンサ３０により平滑されるが、電源電圧が低下してからコンデンサ３０の電圧が低下するまでにある程度の時間がかかる。このため、交流−交流直接変換器のように主回路に大きなエネルギーバッファを持たない回路では、実際に停電が発生してからこれを検出するまでに時間を要するという問題があった。 However, separately providing a power supply voltage drop detection circuit as shown in FIG. 4 for power failure detection causes a high cost.
In FIG. 4, the voltage rectified by the full-wave rectifier circuit 33 is smoothed by the capacitor 30, but it takes a certain amount of time until the voltage of the capacitor 30 decreases after the power supply voltage decreases. For this reason, a circuit that does not have a large energy buffer in the main circuit, such as an AC-AC direct converter, has a problem that it takes time to detect this after a power failure actually occurs.

更に、負荷２から電源１に電力が回生される過程で停電が発生すると、電源１側には電圧が発生しているため、電源電圧の低下によって停電を検出する方法では異常検出を行うことができない。従って、図４の電源電圧低下検出回路を図３の電源異常検出手段１０１に用いた場合には、ＰＷＭ信号作成手段１００が通常動作を行って交流−交流直接変換器３は回生動作を継続する。
これに伴い、停電中の電源１に回生できないエネルギーは入力フィルタ４内のコンデンサ４２や保護回路１０内のコンデンサ１４に蓄積され、電圧検出手段１２及びゲート信号作成手段１００の動作によってスイッチング素子１６が導通することにより、コンデンサ１４の蓄積エネルギーは抵抗１５により消費される。 Furthermore, when a power failure occurs in the process of regenerating power from the load 2 to the power source 1, a voltage is generated on the power source 1 side. Can not. Therefore, when the power supply voltage drop detection circuit of FIG. 4 is used for the power supply abnormality detection means 101 of FIG. 3, the PWM signal creation means 100 performs a normal operation, and the AC-AC direct converter 3 continues the regenerative operation. .
Accordingly, energy that cannot be regenerated in the power supply 1 during a power failure is accumulated in the capacitor 42 in the input filter 4 and the capacitor 14 in the protection circuit 10, and the switching element 16 is activated by the operation of the voltage detection means 12 and the gate signal creation means 100. By conducting, the energy stored in the capacitor 14 is consumed by the resistor 15.

この場合、コンデンサ１４に蓄積されて放出される負荷２からの回生エネルギーは、前述した全ゲート遮断時に放出されるリアクトル４１や負荷２からのエネルギーに比べて極めて大きいため、その全エネルギーを抵抗１５により消費しようとすると抵抗１５は破損する。抵抗１５の破損により、コンデンサ１４の電圧は上昇し続け、結果的にダイオードブリッジ２０ａ，２０ｂや交流−交流直接変換器３内の半導体スイッチング素子の破損を招くという問題があった。   In this case, since the regenerative energy from the load 2 accumulated and discharged in the capacitor 14 is extremely larger than the energy from the reactor 41 and the load 2 released when all the gates are cut off, the total energy is reduced by the resistor 15. Therefore, the resistor 15 is broken when it is consumed. Due to the breakage of the resistor 15, the voltage of the capacitor 14 continues to rise, resulting in the damage of the diode bridges 20 a and 20 b and the semiconductor switching elements in the AC-AC direct converter 3.

そこで本発明の解決課題は、図４に示したような電源電圧低下検出回路を用いることなく停電等の電源異常を検出でき、しかも回生動作中に停電が発生した場合にも保護動作を確実に実行可能とした交流−交流直接変換器の保護装置を提供することにある。   Therefore, the problem to be solved by the present invention is that it is possible to detect a power failure such as a power failure without using a power supply voltage drop detection circuit as shown in FIG. 4, and to ensure a protective operation even when a power failure occurs during a regenerative operation. An object of the present invention is to provide a protection device for an AC-AC direct converter which can be executed.

上記課題を解決するため、請求項１に記載した発明は、多相交流電圧を任意の大きさ及び周波数を有する多相交流電圧に変換する交流−交流直接変換器において、
電源電圧の瞬時値を検出する電源電圧検出手段と、この電源電圧検出手段の出力から電源電圧ベクトルの大きさを演算する演算手段と、この演算手段により演算した電源電圧ベクトルの大きさに基づいて電源の異常を検出する電源異常検出手段と、この電源異常検出手段から出力される異常検出信号に従って交流−交流直接変換器の動作を停止させる手段と、を備えたものである。 In order to solve the above-mentioned problem, the invention described in claim 1 is an AC-AC direct converter that converts a polyphase AC voltage into a polyphase AC voltage having an arbitrary magnitude and frequency.
Based on the power supply voltage detection means for detecting the instantaneous value of the power supply voltage, the calculation means for calculating the magnitude of the power supply voltage vector from the output of the power supply voltage detection means, and the magnitude of the power supply voltage vector calculated by the calculation means Power supply abnormality detection means for detecting an abnormality in the power supply, and means for stopping the operation of the AC-AC direct converter according to the abnormality detection signal output from the power supply abnormality detection means.

請求項２に記載した発明は、請求項１に記載した交流−交流直接変換器の保護装置において、交流−交流直接変換器による負荷の駆動運転または制動運転を判別する駆動／制動判別手段を備え、電源異常検出手段は、電源電圧ベクトルの大きさと前記駆動／制動判別手段による判別結果とに基づいて電源の異常を検出するものである。   According to a second aspect of the present invention, there is provided the AC / AC direct converter protective device according to the first aspect, further comprising drive / brake discriminating means for discriminating a driving operation or a braking operation of a load by the AC / AC direct converter. The power supply abnormality detection means detects a power supply abnormality based on the magnitude of the power supply voltage vector and the determination result by the driving / braking determination means.

請求項３に記載した発明は、請求項１または２に記載した交流−交流直接変換器の保護装置において、電源異常検出手段は、電源電圧ベクトルの大きさが電圧低下基準値より減少した時に交流不足電圧を検出し、電圧上昇基準値より増加したときに交流過電圧を検出するものである。   According to a third aspect of the present invention, in the protection device for an AC-AC direct converter according to the first or second aspect, the power supply abnormality detecting means is configured to supply alternating current when the magnitude of the power supply voltage vector decreases from a voltage drop reference value. An undervoltage is detected, and an AC overvoltage is detected when the voltage rises above the reference voltage increase value.

本発明によれば、電源電圧低下検出回路を用いずに電源電圧ベクトルの大きさに基づいて電源異常を検出するので、電圧低下や上昇の何れの場合においても交流−交流直接変換器の動作を停止させることができる。また、電源電圧の過電圧を検出した場合には、交流−交流直接変換器を再始動するか否かを選択することも可能である。
従って、電源異常時における交流−交流直接変換器の半導体スイッチング素子の破壊を防止でき、再始動時の運転方法を選択可能な保護装置を実現することができる。 According to the present invention, since the power supply abnormality is detected based on the magnitude of the power supply voltage vector without using the power supply voltage drop detection circuit, the operation of the AC-AC direct converter can be performed in both cases of voltage drop and rise. Can be stopped. In addition, when an overvoltage of the power supply voltage is detected, it is possible to select whether or not to restart the AC-AC direct converter.
Therefore, it is possible to prevent the semiconductor switching element of the AC / AC direct converter from being damaged when the power supply is abnormal, and to realize a protection device that can select an operation method at the time of restart.

以下、図に沿って本発明の実施形態を説明する。
まず、図１は請求項１及び請求項３に相当する本発明の第１実施形態の構成図であり、図３と同一の構成要素には同一の参照符号を付して説明を省略し、以下では異なる部分を中心に説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1 is a block diagram of a first embodiment of the present invention corresponding to claim 1 and claim 3, wherein the same components as those in FIG. Below, it demonstrates focusing on a different part.

図１において、２００は三相交流電源１の各相電圧ｖＲ，ｖＳ，ｖＴの瞬時値を検出する電源電圧検出手段である。この手段２００により検出された電圧ｖＲ，ｖＳ，ｖＴは電源電圧のベクトル大きさ演算手段２０１に入力されている。
演算手段２０１は、電源電圧検出値に基づいて三相電圧を二相量に変換し、電源電圧ベクトルの大きさＶｉを演算する。電源異常検出手段２０２は、Ｖｉを予め設定された電圧低下基準値、電圧上昇基準値と比較して電源異常を検出し、その検出信号をＰＷＭ信号作成手段１００に出力する。
なお、図１における放電手段１１は、図３に示した電圧検出手段１２、ゲート信号作成手段１３、コンデンサ１４、抵抗１５及びスイッチング素子１６を纏めて示したものである。 In FIG. 1, reference numeral 200 denotes power supply voltage detection means for detecting instantaneous values of the phase voltages v R , v S , and v T of the three-phase AC power supply 1. The voltages v R , v S , and v T detected by the means 200 are input to the power supply voltage vector magnitude calculation means 201.
The calculating means 201 converts the three-phase voltage into a two-phase quantity based on the detected power supply voltage value, and calculates the power supply voltage vector magnitude V i . The power supply abnormality detection unit 202 detects a power supply abnormality by comparing V i with a preset voltage decrease reference value and voltage increase reference value, and outputs the detection signal to the PWM signal generation unit 100.
The discharge means 11 in FIG. 1 collectively shows the voltage detection means 12, the gate signal creation means 13, the capacitor 14, the resistor 15, and the switching element 16 shown in FIG.

電源電圧のベクトル大きさ演算手段２０１が実行する三相／二相変換の演算、及び、演算される電源電圧ベクトルの大きさＶｉは、それぞれ数式１，２によって表すことができる。 The calculation of the three-phase / two-phase conversion executed by the power supply voltage vector magnitude calculation unit 201 and the calculated power supply voltage vector magnitude V i can be expressed by Equations 1 and 2, respectively.

Figure 2006074904
Figure 2006074904

Figure 2006074904
Figure 2006074904

電源１から負荷２へ電力を供給している場合、すなわち駆動時に停電が発生すると、電源電圧の低下に伴って電源電圧ベクトルの大きさＶｉも減少する。電源電圧ベクトルの大きさＶｉが電圧低下基準値を下回ると、電源異常検出手段２０２は停電と判断し、ＰＷＭ信号作成手段１００へ異常検出信号を出力してＰＷＭ信号作成手段１００を介し全ゲート遮断を行う。 When power is supplied from the power source 1 to the load 2, that is, when a power failure occurs during driving, the power source voltage vector magnitude V i also decreases as the power source voltage decreases. When the magnitude V i of the power supply voltage vector falls below the voltage drop reference value, the power supply abnormality detection unit 202 determines that a power failure has occurred, and outputs an abnormality detection signal to the PWM signal generation unit 100 to output all the gates via the PWM signal generation unit 100. Shut off.

一方、負荷２から電源１へ電力を回生している場合、すなわち制動時に停電が発生すると、前述したように回生エネルギーによって入力フィルタ４のコンデンサ４２の電圧や保護回路１０内の直流電圧を上昇させる。
これと同時に、演算手段２０１によって検出される電源電圧ベクトルの大きさＶｉも増加し、その大きさが電源異常検出手段２０２における電圧上昇基準値を上回ると、電源異常検出手段２０２は交流過電圧と判断し、ＰＷＭ信号作成手段１００へ異常検出信号を出力する。
これにより、ＰＷＭ信号作成手段１００では駆動時と同様に全ゲート遮断を行って交流−交流直接変換器３が回生動作を停止するので、保護回路１０内の直流電圧の上昇が抑制され、ダイオードブリッジ２０ａ，２０ｂや直接変換器３内のスイッチング素子が保護される。 On the other hand, when power is regenerated from the load 2 to the power source 1, that is, when a power failure occurs during braking, the voltage of the capacitor 42 of the input filter 4 and the DC voltage in the protection circuit 10 are increased by regenerative energy as described above. .
At the same time, the magnitude V i of the power supply voltage vector detected by the computing means 201 also increases, and when the magnitude exceeds the voltage rise reference value in the power supply abnormality detection means 202, the power supply abnormality detection means 202 becomes an AC overvoltage. Judgment is made and an abnormality detection signal is output to the PWM signal generating means 100.
As a result, the PWM signal generating means 100 performs all gate shut-off in the same way as during driving, and the AC-AC direct converter 3 stops the regenerative operation, so that an increase in the DC voltage in the protection circuit 10 is suppressed, and the diode bridge The switching elements 20a and 20b and the direct converter 3 are protected.

なお、駆動運転中に電源系統の異常等により交流過電圧が発生した場合にも、電源異常検出手段２０２は異常検出信号を出力可能であり、全ゲート遮断を行って直接変換器３を保護することができる。   Even when an AC overvoltage occurs due to an abnormality in the power supply system during driving operation, the power supply abnormality detection means 202 can output an abnormality detection signal, and all the gates are shut off to protect the converter 3 directly. Can do.

本実施形態においては、電源異常検出後、電源電圧ベクトルの大きさＶｉが電圧低下基準値以上かつ電圧上昇基準値以下になったことで電源異常に起因する全ゲート遮断を解除し、交流−交流直接変換器３を再始動することも可能である。
なお、図１における電源電圧検出手段２００は、入力フィルタ４の二次側に接続してもよい。 In the present embodiment, to release after the power failure detection, the size V i is more brownout reference value and it becomes less voltage rise reference value total gate shutdown due to power failure in the power supply voltage vector, AC - It is also possible to restart the AC direct converter 3.
1 may be connected to the secondary side of the input filter 4.

次に、図２は請求項１及び請求項３に相当する本発明の第２実施形態の構成図である。
図２において、駆動／制動判別手段１０３は、制御信号作成手段１０２の出力に基づき、電源１から負荷２へ電力が供給されている状態、または、負荷２から電源１へ電力が回生されている状態を判別して駆動運転、制動運転を判別する。これは、負荷２が例えば電動機の場合、トルク指令やトルク軸電圧指令に基づいて判別することができる。
駆動／制動判別手段１０３からの判別信号は電源異常検出手段２０２に入力されている。
この実施形態において、停電等による電源電圧低下時の保護動作については、第１実施形態と同様であるため説明を省略する。 Next, FIG. 2 is a block diagram of a second embodiment of the present invention corresponding to claims 1 and 3.
In FIG. 2, the driving / braking determination unit 103 is in a state where power is supplied from the power source 1 to the load 2 based on the output of the control signal generation unit 102, or power is regenerated from the load 2 to the power source 1. The state is discriminated to determine the driving operation and the braking operation. This can be determined based on a torque command or torque shaft voltage command when the load 2 is, for example, an electric motor.
A determination signal from the driving / braking determination unit 103 is input to the power supply abnormality detection unit 202.
In this embodiment, the protection operation when the power supply voltage is lowered due to a power failure or the like is the same as that in the first embodiment, and thus the description thereof is omitted.

駆動／制動判別手段１０３が制動運転（すなわち回生運転）であることを判別した場合には、その判別信号を電源異常検出手段２０２へ出力すると共に、停電等により、電源電圧ベクトルの大きさ演算手段２０１によって演算された大きさＶｉが電圧上昇基準値を上回ると、電源異常検出手段２０２は制動中の交流過電圧による異常を検出する。これにより、電源異常検出手段２０２から異常検出信号がＰＷＭ信号作成手段１００へ出力され、全ゲート遮断を行って交流−交流直接変換器３の制動運転を停止する。
このため、保護回路１０内の直流電圧の上昇を抑制することができ、ダイオードブリッジ２０ａ，２０ｂや直接変換器３内のスイッチング素子を保護することができる。 When it is determined that the driving / braking determination means 103 is a braking operation (that is, a regenerative operation), the determination signal is output to the power supply abnormality detection means 202, and the power voltage vector magnitude calculation means is caused by a power failure or the like. When the magnitude V i calculated by 201 exceeds the voltage rise reference value, the power source abnormality detecting means 202 detects an abnormality due to the AC overvoltage during braking. As a result, an abnormality detection signal is output from the power supply abnormality detection means 202 to the PWM signal creation means 100, and all the gates are cut off to stop the braking operation of the AC-AC direct converter 3.
For this reason, an increase in the DC voltage in the protection circuit 10 can be suppressed, and the diode bridges 20a and 20b and the switching elements in the direct converter 3 can be protected.

また、駆動時に交流過電圧が発生した場合にも、これらの状態を電源異常検出手段２０２が検出可能であるから、電源系統に異常が発生したことを判別して制動時と同様に全ゲート遮断を行う。   In addition, even when an AC overvoltage occurs during driving, the power supply abnormality detecting means 202 can detect these states, so that it is determined that an abnormality has occurred in the power supply system, and all gates are shut off in the same way as during braking. Do.

本実施形態によれば、電源異常検出手段２０２が電源電圧ベクトルの大きさＶｉと駆動／制動とを判別して全ゲート遮断を行うか否かを決定できるため、例えば、電源電圧の低下または制動中の交流過電圧では再始動するが、駆動中の交流過電圧、すなわち電源系統の異常の場合は再始動しないといった運転方法をとることが可能である。
なお、この実施形態においても、電源電圧検出手段２００を入力フィルタ４の二次側に接続してもよい。 According to the present embodiment, the power supply abnormality detection means 202 can determine whether to shut off all the gates by determining the magnitude V i of the power supply voltage vector and driving / braking. It is possible to take an operation method that restarts when the AC overvoltage is being braked but does not restart if the AC overvoltage is being driven, that is, if the power supply system is abnormal.
In this embodiment as well, the power supply voltage detection means 200 may be connected to the secondary side of the input filter 4.

本発明の第１実施形態の構成図である。It is a block diagram of 1st Embodiment of this invention. 本発明の第２実施形態の構成図である。It is a block diagram of 2nd Embodiment of this invention. 従来の交流−交流直接変換器及びその制御装置を保護装置と共に示した構成図である。It is the block diagram which showed the conventional AC-AC direct converter and its control apparatus with the protective device. 従来の電源電圧低下検出回路の構成図である。It is a block diagram of the conventional power supply voltage fall detection circuit.

符号の説明Explanation of symbols

１：交流電源
２：負荷
３：交流−交流直接変換器
４：入力フィルタ
４１：リアクトル
４２：コンデンサ
１０：保護回路
１１：放電手段
１２：電圧検出手段
１３：ゲート信号作成手段
１４：コンデンサ
１５：抵抗
１６：半導体スイッチング素子
２０ａ，２０ｂ：ダイオードブリッジ
１００：ＰＷＭ信号作成手段
１０２：制御信号作成手段
１０３：駆動／制動判別手段
２００：電源電圧検出手段
２０１：電源電圧ベクトルの大きさ演算手段
２０２：電源異常検出手段 1: AC power supply 2: Load 3: AC-AC direct converter 4: Input filter 41: Reactor 42: Capacitor 10: Protection circuit 11: Discharge means 12: Voltage detection means 13: Gate signal preparation means 14: Capacitor 15: Resistance 16: Semiconductor switching element 20a, 20b: Diode bridge 100: PWM signal creation means 102: Control signal creation means 103: Driving / braking determination means 200: Power supply voltage detection means 201: Power supply voltage vector magnitude calculation means 202: Power supply abnormality Detection means

Claims (3)

多相交流電圧を任意の大きさ及び周波数を有する多相交流電圧に変換する交流−交流直接変換器において、
電源電圧の瞬時値を検出する電源電圧検出手段と、
この電源電圧検出手段の出力から電源電圧ベクトルの大きさを演算する演算手段と、
この演算手段により演算した電源電圧ベクトルの大きさに基づいて電源の異常を検出する電源異常検出手段と、
この電源異常検出手段から出力される異常検出信号に従って交流−交流直接変換器の動作を停止させる手段と、
を備えたことを特徴とする交流−交流直接変換器の保護装置。 In an AC-AC direct converter for converting a polyphase AC voltage into a polyphase AC voltage having an arbitrary magnitude and frequency,
Power supply voltage detection means for detecting an instantaneous value of the power supply voltage;
Arithmetic means for calculating the magnitude of the power supply voltage vector from the output of the power supply voltage detection means;
A power supply abnormality detection means for detecting a power supply abnormality based on the magnitude of the power supply voltage vector calculated by the calculation means;
Means for stopping the operation of the AC-AC direct converter according to the abnormality detection signal output from the power supply abnormality detection means;
A protective device for an AC-AC direct converter characterized by comprising: 請求項１に記載した交流−交流直接変換器の保護装置において、
交流−交流直接変換器による負荷の駆動運転または制動運転を判別する駆動／制動判別手段を備え、
電源異常検出手段は、電源電圧ベクトルの大きさと前記駆動／制動判別手段による判別結果とに基づいて電源の異常を検出することを特徴とする交流−交流直接変換器の保護装置。 The protection device for an AC-AC direct converter according to claim 1,
A drive / brake discriminating means for discriminating a driving operation or a braking operation of a load by an AC-AC direct converter;
The AC / AC direct converter protection device, wherein the power supply abnormality detecting means detects a power supply abnormality based on a magnitude of a power supply voltage vector and a determination result by the driving / braking determination means. 請求項１または２に記載した交流−交流直接変換器の保護装置において、
電源異常検出手段は、電源電圧ベクトルの大きさが電圧低下基準値より減少した時に交流不足電圧を検出し、電圧上昇基準値より増加したときに交流過電圧を検出することを特徴とする交流−交流直接変換器の保護装置。 In the protection device for an AC-AC direct converter according to claim 1 or 2,
The power supply abnormality detecting means detects an AC undervoltage when the magnitude of the power supply voltage vector decreases from a voltage drop reference value, and detects an AC overvoltage when it increases from a voltage rise reference value. Direct converter protection device.
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JP2011004554A (en) * 2009-06-19 2011-01-06 Osaka Gas Co Ltd Snubber circuit for power conversion circuit, and power conversion circuit including the same
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JP2006254624A (en) * 2005-03-11 2006-09-21 Fuji Electric Holdings Co Ltd Controller of ac-ac converter
JP2007025740A (en) * 2005-07-12 2007-02-01 Fuji Electric Holdings Co Ltd Power supply abnormality detector
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JP2011004554A (en) * 2009-06-19 2011-01-06 Osaka Gas Co Ltd Snubber circuit for power conversion circuit, and power conversion circuit including the same
JP6477979B1 (en) * 2018-02-14 2019-03-06 株式会社安川電機 Power conversion system, lifting system, and power conversion method
WO2019159264A1 (en) * 2018-02-14 2019-08-22 株式会社安川電機 Power conversion system, hoist system, and power conversion method

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