JP2010178540A - Power converter - Google Patents

Power converter Download PDF

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JP2010178540A
JP2010178540A JP2009019885A JP2009019885A JP2010178540A JP 2010178540 A JP2010178540 A JP 2010178540A JP 2009019885 A JP2009019885 A JP 2009019885A JP 2009019885 A JP2009019885 A JP 2009019885A JP 2010178540 A JP2010178540 A JP 2010178540A
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switch
converter
capacitor
resistor
turned
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JP5386185B2 (en
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Katsuhiko Fukuma
勝彦 福間
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Toshiba Mitsubishi Electric Industrial Systems Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power converter having an overvoltage protection function of preventing impact on a power device that constitutes an AC-DC converter, even if a cause for overvoltage of a DC capacitor is continued. <P>SOLUTION: The power converter is constituted of an AC-DC converter 3 for converting power between AC and DC; a DC capacitor 4 provided in a DC link unit; a first resistor 5B, provided to discharge electric charges accumulated in the DC capacitor 4 and connected via a first switch 5A; a second resistor 6B, having a resistance value lower than that of the first resistor 5A and so connected as to discharge electric charges accumulated in the DC capacitor 4 via a second switch 6A; and a protection sequence circuit 10 for controlling the on/off of the first switch 5A and the second switch 6A. When the protection sequence circuit 10 is provided with a trigger signal for overvoltage protection of the DC capacitor 4, the first switch 5A is turned on. Then, when a predetermined period of time has passed, after the first switch 5A has been turned on, the protection sequence circuit turns on the second switch 6A. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は電力変換装置に係り、過電圧保護機能を有する電力変換装置に関する。   The present invention relates to a power converter, and more particularly to a power converter having an overvoltage protection function.

直流リンク部に平滑用の直流コンデンサを有する所謂電圧形の交直変換器を用いた電力変換装置においては、交流側に過電圧が発生すると直流コンデンサが過充電され、場合によっては直流コンデンサが破損する等の問題が生じる場合があった。また、特に交直変換器が多レベル変換器の場合、変換器を構成するスイッチング素子やダイオードが破損して短絡状態になったとき、この影響で直流コンデンサが交流側の線間電圧のピーク値で充電されて過電圧となる場合もあった。   In a power converter using a so-called voltage-type AC / DC converter having a smoothing DC capacitor in the DC link part, the DC capacitor is overcharged when an overvoltage occurs on the AC side, and the DC capacitor may be damaged in some cases. There were cases where problems occurred. In particular, when the AC / DC converter is a multi-level converter, when the switching elements and diodes that make up the converter are damaged and become short-circuited, the DC capacitor becomes the peak value of the line voltage on the AC side due to this effect. In some cases, the battery was overcharged.

上記のような直流コンデンサの過電圧異常を保護する手法として従来から用いられているのは、直流コンデンサと並列にスイッチを介した放電用抵抗器を設け、過電圧が生じたときこのスイッチを投入して直流コンデンサの電荷を放電用抵抗器に吸収させる手法である。（例えば特許文献１参照。）。   As a method for protecting the overvoltage abnormality of the DC capacitor as described above, a discharging resistor through a switch is provided in parallel with the DC capacitor, and this switch is turned on when an overvoltage occurs. This is a technique in which the charge of the DC capacitor is absorbed by the discharging resistor. (For example, refer to Patent Document 1).

特開２０００−３５８３８４号公報（全体）JP 2000-358384 A (Overall)

特許文献１に示された手法は、例えば交流電源の過電圧が短時間のサージ電圧のような一過性のものである場合には有効であるが、交流電源の過電圧がある程度継続する場合、また交直変換器を構成するスイッチング素子やダイオードが破損して短絡状態となっている場合には、放電用抵抗器への充電電流が直流コンデンサからのみではなく交流電源からダイオード或いはスイッチング素子を介して流入するため、交直変換器を構成するダイオードなどのパワーデバイスが過電流となって破損する恐れがあった。   The technique disclosed in Patent Document 1 is effective, for example, when the overvoltage of the AC power supply is transient such as a short-time surge voltage, but when the overvoltage of the AC power supply continues to some extent, When the switching element or diode constituting the AC / DC converter is damaged and short-circuited, the charging current to the discharging resistor flows not only from the DC capacitor but also from the AC power supply via the diode or switching element. Therefore, a power device such as a diode constituting the AC / DC converter may be damaged due to overcurrent.

本発明は上記に鑑みて為されたもので、直流コンデンサが過電圧となる要因がある程度継続しても、交直変換器を構成するパワーデバイスに影響を与えることない過電圧保護機能を備えた電力変換装置を提供することを目的とする。   The present invention has been made in view of the above, and a power conversion device having an overvoltage protection function that does not affect the power device constituting the AC / DC converter even if a factor causing the overvoltage of the DC capacitor continues to some extent The purpose is to provide.

上記目的を達成するために、本発明の電力変換装置は、交流と直流間の電力変換を行なう交直変換器と、前記交直変換器の直流リンク部に設けられた平滑用の直流コンデンサと、
前記直流コンデンサに蓄えられた電荷を放電するために設けられ、第１のスイッチを介して接続された第１の抵抗器と、前記第１の抵抗器より抵抗値が低く、第２のスイッチを介して前記直流コンデンサに蓄えられた電荷を放電するように接続された第２の抵抗器と、
前記第１のスイッチ及び前記第２のスイッチのオンオフを制御するための保護シーケンス回路とを具備し、前記保護シーケンス回路は、前記直流コンデンサの過電圧保護用のトリガ信号が与えられたとき、前記第１のスイッチをオンし、前記第１のスイッチがオンして所定時間経過後前記第２のスイッチをオンするようにしたことを特徴としている。 In order to achieve the above object, the power conversion device of the present invention includes an AC / DC converter that performs power conversion between AC and DC, a smoothing DC capacitor provided in a DC link portion of the AC / DC converter,
A first resistor provided to discharge the electric charge stored in the DC capacitor and connected via a first switch; a resistance value lower than that of the first resistor; A second resistor connected to discharge the charge stored in the DC capacitor via
A protection sequence circuit for controlling on / off of the first switch and the second switch, and the protection sequence circuit receives the trigger signal for overvoltage protection of the DC capacitor. The first switch is turned on, and the second switch is turned on after a lapse of a predetermined time after the first switch is turned on.

本発明によれば、直流コンデンサが過電圧となる要因がある程度継続しても、交直変換器を構成するパワーデバイスに影響を与えることない過電圧保護機能を備えた電力変換装置を提供することが可能となる。   According to the present invention, it is possible to provide a power conversion device having an overvoltage protection function that does not affect the power devices constituting the AC / DC converter even if a factor that causes the DC capacitor to become overvoltage continues to some extent. Become.

本発明の第１の実施例に係る電力変換装置の回路構成図。The circuit block diagram of the power converter device which concerns on 1st Example of this invention. 本発明の第２の実施例に係る電力変換装置の回路構成図。The circuit block diagram of the power converter device which concerns on 2nd Example of this invention. 本発明の第３の実施例に係る電力変換装置の回路構成図。The circuit block diagram of the power converter device which concerns on the 3rd Example of this invention. 本発明の第４の実施例に係る電力変換装置の回路構成図。The circuit block diagram of the power converter device which concerns on the 4th Example of this invention.

以下、図面を参照して本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は本発明の実施例１に係る電力変換装置の回路構成図である。交流電源から入力用の遮断器１及び入力用の変圧器２を介して交直変換器３に交流電力が給電されている。交直変換器３はパワーデバイスをブリッジ接続して構成されている。図１においては自己消弧型のスイッチング素子及びこれと逆並列に接続されたダイオードによってパワーデバイスが構成されている。従って図１の交直変換器３の場合、回生動作が可能となる。   FIG. 1 is a circuit configuration diagram of a power conversion apparatus according to Embodiment 1 of the present invention. AC power is supplied to the AC / DC converter 3 from the AC power source through the input circuit breaker 1 and the input transformer 2. The AC / DC converter 3 is configured by bridge-connecting power devices. In FIG. 1, a power device is constituted by a self-extinguishing type switching element and a diode connected in reverse parallel thereto. Therefore, in the case of the AC / DC converter 3 of FIG. 1, a regenerative operation is possible.

交直変換器３の直流リンク部には電圧平滑用の直流コンデンサ４が接続されている。また、直流コンデンサ４に印加される電圧を電圧検出器７で検出している。そして、直流コンデンサ４の電荷を放電するためにスイッチ５Ａを介して放電用の抵抗器５Ｂが、またスイッチ６Ａを介して放電用の抵抗器６Ｂが接続されている。ここで抵抗器６Ｂの抵抗値は抵抗器６Ａの抵抗値より低く選定している。   A DC capacitor 4 for voltage smoothing is connected to the DC link portion of the AC / DC converter 3. The voltage applied to the DC capacitor 4 is detected by a voltage detector 7. In order to discharge the electric charge of the DC capacitor 4, a discharging resistor 5B is connected via a switch 5A, and a discharging resistor 6B is connected via a switch 6A. Here, the resistance value of the resistor 6B is selected to be lower than the resistance value of the resistor 6A.

電圧検出器７で検出された電圧は保護シーケンス回路１０の内部の過電圧検出回路１１に与えられる。過電圧検出回路１１はこの検出電圧が所定の閾値以上であったとき直流コンデンサ４の過電圧保護用のトリガ信号を発し、このトリガ信号によってスイッチ５Ａを投入すると同時に遮断器１を開放する信号を出力する。そして保護シーケンス回路１０は遮断器１が開放されたことを開放検出回路１２によって検出した後、スイッチ６Ａを投入する。   The voltage detected by the voltage detector 7 is given to the overvoltage detection circuit 11 inside the protection sequence circuit 10. The overvoltage detection circuit 11 generates a trigger signal for overvoltage protection of the DC capacitor 4 when the detected voltage is equal to or higher than a predetermined threshold, and outputs a signal for opening the circuit breaker 1 simultaneously with turning on the switch 5A by this trigger signal. . The protection sequence circuit 10 detects that the circuit breaker 1 has been opened by the open detection circuit 12, and then turns on the switch 6A.

以上の構成における動作について以下説明する。   The operation in the above configuration will be described below.

過電圧検出回路１１が過電圧を検出すると、瞬時にスイッチ５Ａを投入する。スイッチ５Ａを所謂半導体スイッチとしておけば投入遅れは実質的にゼロである。ところが、遮断器１は通常機械式の遮断器であるのでその投入には数１０ｍｓ以上の時間を要する。そして抵抗器５Ｂの抵抗値を、遮断器１が開放されるまでの期間の交流電源側からの突入電流がパワーデバイスを破損しないように且つ直流コンデンサ４の過電圧が大きく上昇しないように選定しておく。そして遮断器１が開放されたことを検出した後、スイッチ６Ａを投入すれば、コンデンサ４の電荷は低抵抗の抵抗器６Ｂによって急速に放電されるので、保守作業などに対してもすぐに安全状態とすることができる。   When the overvoltage detection circuit 11 detects an overvoltage, the switch 5A is turned on instantaneously. If the switch 5A is a so-called semiconductor switch, the insertion delay is substantially zero. However, since the circuit breaker 1 is usually a mechanical circuit breaker, it takes a time of several tens of ms or more to be charged. Then, select the resistance value of the resistor 5B so that the inrush current from the AC power source side during the period until the circuit breaker 1 is opened does not damage the power device and the overvoltage of the DC capacitor 4 does not increase greatly. deep. If the switch 6A is turned on after detecting that the circuit breaker 1 has been opened, the charge of the capacitor 4 is rapidly discharged by the low-resistance resistor 6B. State.

尚、上記においてスイッチ６Ａが投入されたあと、スイッチ５Ａを開放するようにしても良い。また、スイッチ６Ａの正極をスイッチ５Ａの負極に接続する構成としても良い。この場合はスイッチ５Ａが投入されている条件でスイッチ６Ａの投入によって抵抗器６Ｂに放電電流が流れることになる。   In the above, the switch 5A may be opened after the switch 6A is turned on. Further, the positive electrode of the switch 6A may be connected to the negative electrode of the switch 5A. In this case, a discharge current flows through the resistor 6B when the switch 6A is turned on under the condition that the switch 5A is turned on.

また、電圧検出器７は直流リンクの電圧を検出するようにしたが、交流側の電圧を検出して過電圧検出回路に与えるようにしても良い。この場合、３相のうち何れかの線間電圧を検出する手法の他、検出遅れを防止するため３相全ての電圧を検出する手法などが考えられる。   Further, although the voltage detector 7 detects the voltage of the DC link, the voltage detector 7 may detect the voltage on the AC side and give it to the overvoltage detection circuit. In this case, in addition to the method of detecting any line voltage among the three phases, a method of detecting the voltages of all three phases in order to prevent detection delay may be considered.

図２は本発明の実施例２に係る電力変換装置の回路構成図である。   FIG. 2 is a circuit configuration diagram of the power conversion apparatus according to the second embodiment of the present invention.

この実施例２の各部について、図１の本発明の実施例１に係る電力変換装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例２が実施例１と異なる点は、交直変換器３Ａを３レベル変換器とした点、これに伴い直流コンデンサを正側の直流コンデンサ４Ａと負側の直流コンデンサ４Ｂとに分割し、両者を直列接続してその中点にゼロ電位母線を接続するようにした点、正側の直流コンデンサ４Ａの電荷を放電するためにスイッチ５Ａを介して放電用の抵抗器５Ｂを、またスイッチ６Ａを介して放電用の抵抗器６Ｂを接続したことに加え、負側の直流コンデンサ４Ｂの電荷を放電するためにスイッチ５Ｃを介して放電用の抵抗器５Ｄを、またスイッチ６Ｃを介して放電用の抵抗器６Ｄを接続した点である。ここで抵抗器５Ｄは基本的に抵抗器５Ｂと同一の定格とし、抵抗器６Ｄは基本的に抵抗器６Ｂと同一の定格とする。   In the second embodiment, the same parts as those in the circuit configuration diagram of the power conversion apparatus according to the first embodiment of the present invention shown in FIG. The second embodiment is different from the first embodiment in that the AC / DC converter 3A is a three-level converter, and accordingly, the DC capacitor is divided into a positive DC capacitor 4A and a negative DC capacitor 4B. A point in which both are connected in series and a zero potential bus is connected to the middle point thereof, a discharging resistor 5B is connected via a switch 5A to discharge the charge of the positive DC capacitor 4A, and a switch 6A In addition to connecting the discharging resistor 6B via the switch, the discharging resistor 5D is connected via the switch 5C to discharge the negative DC capacitor 4B, and the discharging resistor is connected via the switch 6C. This is the point where the resistor 6D is connected. Here, the resistor 5D has basically the same rating as the resistor 5B, and the resistor 6D has basically the same rating as the resistor 6B.

このように交直変換器がＮレベル（Ｎは３以上の自然数）の構成となっても、Ｎレベルの直流電位を得るために（Ｎ−１）個の直流コンデンサを直列接続し、その各々の直流コンデンサに対して第１のスイッチ及び第１の抵抗器による放電回路並びに第２のスイッチ及び第１の抵抗器より抵抗値の低い第２の抵抗器による放電回路を設け、実施例１で説明したような過電圧保護を各々の直流コンデンサに対して行えば、実施例１と同様の保護機能を達成することが可能となる。   Thus, even if the AC / DC converter has an N level configuration (N is a natural number of 3 or more), in order to obtain an N level DC potential, (N−1) DC capacitors are connected in series, A first capacitor and a discharge circuit using a first resistor, and a second switch and a discharge circuit using a second resistor having a lower resistance value than the first resistor are provided for the DC capacitor. If such overvoltage protection is performed on each DC capacitor, the same protection function as in the first embodiment can be achieved.

尚、図２において電圧検出器７は３レベルの最大の電位差を検出するよう図示してあるが、これを正側及び負側検出用の２台に分割し、その各々の過電圧検出に従って対応する
第１のスイッチ及び第１の抵抗器による放電回路並びに第２のスイッチ及び第２の抵抗器による放電回路を動作させる構成としても良い。 In FIG. 2, the voltage detector 7 is illustrated so as to detect a maximum potential difference of three levels. However, this is divided into two units for detecting the positive side and the negative side, and corresponding to each overvoltage detection. It is good also as a structure which operates the discharge circuit by a 1st switch and a 1st resistor, and the discharge circuit by a 2nd switch and a 2nd resistor.

図３は本発明の実施例３に係る電力変換装置の回路構成図である。   FIG. 3 is a circuit configuration diagram of the power conversion apparatus according to the third embodiment of the present invention.

この実施例３の各部について、図２の本発明の実施例２に係る電力変換装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例３が実施例２と異なる点は、交直変換器３Ａ内に図示しない素子異常検出回路を設け、素子故障検出回路１３によって交直変換器３Ａを構成するパワーデバイスのうち少なくとも１個のパワーデバイスが短絡故障したことを検出し、この出力信号と過電圧検出回路１１の出力信号をＯＲ回路１４に与え、このＯＲ回路１４の出力を直流コンデンサ４Ａ、４Ｂの過電圧保護用のトリガ信号とした点である。   In the third embodiment, the same parts as those in the circuit configuration diagram of the power conversion apparatus according to the second embodiment of the present invention shown in FIG. The third embodiment is different from the second embodiment in that an element abnormality detection circuit (not shown) is provided in the AC / DC converter 3A, and at least one of the power devices constituting the AC / DC converter 3A by the element failure detection circuit 13 is used. It is detected that the device has a short circuit failure, this output signal and the output signal of the overvoltage detection circuit 11 are supplied to the OR circuit 14, and the output of the OR circuit 14 is used as a trigger signal for overvoltage protection of the DC capacitors 4A and 4B. It is.

前述したように、交直変換器３Ａを構成するパワーデバイスのうち少なくとも１個のパワーデバイスが短絡故障すると、全てのスイッチング素子をゲートブロックしても交流電源から直流コンデンサを充電する電流ルートが形成され、正、負何れかの直流コンデンサが交流入力の線間電圧のピーク値で充電される恐れがある。   As described above, when at least one of the power devices constituting the AC / DC converter 3A is short-circuited, a current route for charging the DC capacitor from the AC power source is formed even if all the switching elements are gate-blocked. The positive or negative DC capacitor may be charged with the peak value of the line voltage of the AC input.

このような場合、上記のパワーデバイスの短絡故障信号を用いれば、電圧検出器７による直流電圧の過電圧検出より素早い応答で直流コンデンサの過電圧保護動作を行なうことが可能となる。   In such a case, if the short-circuit fault signal of the power device is used, the overvoltage protection operation of the DC capacitor can be performed with a quicker response than the detection of the overvoltage of the DC voltage by the voltage detector 7.

図４は本発明の実施例４に係る電力変換装置の回路構成図である。   FIG. 4 is a circuit configuration diagram of the power conversion device according to the fourth embodiment of the present invention.

この実施例４の各部について、図３の本発明の実施例３に係る電力変換装置の回路構成図の各部と同一部分は同一符号で示し、その説明は省略する。この実施例４が実施例３と異なる点は、交直変換器３Ｂを３レベルのインバータとし、その交流出力で交流電動機８を駆動する構成とした点、開放検出回路１２に代えてタイマ１５を設け、ＯＲ回路１４の出力をタイマ１５に与え、タイマ１５の出力で第２のスイッチ６Ａ、６Ｂを投入する構成とした点である。尚、図４においては直流電圧を与えるための電源7の図示を省略している。   In each part of the fourth embodiment, the same parts as those in the circuit configuration diagram of the power conversion apparatus according to the third embodiment of the present invention shown in FIG. The fourth embodiment is different from the third embodiment in that the AC / DC converter 3B is a three-level inverter and the AC motor 8 is driven by the AC output, and a timer 15 is provided instead of the open detection circuit 12. The output of the OR circuit 14 is given to the timer 15, and the second switches 6A and 6B are turned on by the output of the timer 15. In FIG. 4, the illustration of the power source 7 for applying a DC voltage is omitted.

交直変換器３Ｂによって交流電動機８を駆動する場合、出力側に開閉器を設けないのが通常である。従って、図４の場合、第２のスイッチ６Ａ、６Ｃを投入するタイミングが問題となる。交直変換器３Ｂ内のパワーデバイスの故障を素子故障検出回路１３が検出して第１のスイッチ５Ａ、５Ｃが投入されたあとの回路動作を予めシミュレーション等によって解析しておけば、第１のスイッチ５Ａ、５Ｃが投入されてから所定の時間後第２のスイッチ６Ａ、６Ｃを投入しても過電流による素子ダメージが生じないことを予め推定することが可能であるので、この時間をタイマ１５の設定値とする。   When the AC motor 8 is driven by the AC / DC converter 3B, it is normal that no switch is provided on the output side. Therefore, in the case of FIG. 4, the timing of turning on the second switches 6A and 6C becomes a problem. If the failure of the power device in the AC / DC converter 3B is detected by the element failure detection circuit 13 and the circuit operation after the first switches 5A and 5C are turned on is analyzed in advance by simulation or the like, the first switch Since it is possible to estimate in advance that element damage due to overcurrent will not occur even if the second switches 6A and 6C are turned on after a predetermined time has passed since turning on 5A and 5C, Set value.

また、タイマ１５を使用せずに、電圧検出器７の検出電圧が所定の値以下になったことを過電圧検出回路１１によって検出し、このタイミングで第２のスイッチ６Ａ、６Ｃを投入するようにしても良い。   Further, the overvoltage detection circuit 11 detects that the detection voltage of the voltage detector 7 has become a predetermined value or less without using the timer 15, and the second switches 6A and 6C are turned on at this timing. May be.

１ 遮断器
２ 変圧器
３、３Ａ、３Ｂ 交直変換器
４、４Ａ、４Ｂ 直流コンデンサ
５Ａ、５Ｃ スイッチ
５Ｂ、５Ｄ 抵抗器
６Ａ、６Ｃ スイッチ
６Ｂ、６Ｄ 抵抗器
７ 電圧検出器
８ 交流電動機
１０ 保護シーケンス回路
１１ 過電圧検出器
１２ 開放検出器
１３ 素子故障検出回路
１４ ＯＲ回路 DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Transformer 3, 3A, 3B AC / DC converter 4, 4A, 4B DC capacitor 5A, 5C Switch 5B, 5D Resistor 6A, 6C Switch 6B, 6D Resistor 7 Voltage detector 8 AC motor 10 Protection sequence circuit 11 Overvoltage detector 12 Open detector 13 Element failure detection circuit 14 OR circuit

Claims (5)

交流と直流間の電力変換を行なう交直変換器と、
前記交直変換器の直流リンク部に設けられた平滑用の直流コンデンサと、
前記直流コンデンサに蓄えられた電荷を放電するために設けられ、第１のスイッチを介して接続された第１の抵抗器と、
前記第１の抵抗器より抵抗値が低く、第２のスイッチを介して前記直流コンデンサに蓄えられた電荷を放電するように接続された第２の抵抗器と、
前記第１のスイッチ及び前記第２のスイッチのオンオフを制御するための保護シーケンス回路と
を具備し、
前記保護シーケンス回路は、
前記直流コンデンサの過電圧保護用のトリガ信号が与えられたとき、前記第１のスイッチをオンし、
前記第１のスイッチがオンして所定時間経過後前記第２のスイッチをオンするようにしたことを特徴とする電力変換装置。 An AC / DC converter that performs power conversion between AC and DC;
DC capacitor for smoothing provided in the DC link part of the AC / DC converter,
A first resistor provided for discharging the charge stored in the DC capacitor and connected via a first switch;
A second resistor having a resistance value lower than that of the first resistor and connected to discharge the electric charge stored in the DC capacitor via a second switch;
A protection sequence circuit for controlling on / off of the first switch and the second switch,
The protection sequence circuit includes:
When a trigger signal for overvoltage protection of the DC capacitor is given, the first switch is turned on,
A power conversion apparatus, wherein the second switch is turned on after a predetermined time has elapsed since the first switch was turned on. 前記交直変換器はN（Nは３以上の自然数）レベル変換器であり、
前記直流コンデンサはNレベルの直流電位を得るために（Ｎ−１）個が直列接続され、
その各々の前記直流コンデンサに対して前記第１のスイッチ及び前記第１の抵抗器並びに前記第２のスイッチ及び前記第２の抵抗器が設けられていることを特徴とする請求項１に記載の電力変換装置。 The AC / DC converter is an N (N is a natural number of 3 or more) level converter,
(N-1) DC capacitors are connected in series to obtain an N level DC potential.
The first switch and the first resistor, and the second switch and the second resistor are provided for each of the DC capacitors. Power conversion device. 交流電源と前記交直変換器の間に設けられた遮断器を備え、
前記保護シーケンス回路は、
前記トリガ信号が与えられたとき、前記遮断器にオフ指令を出力し、
前記遮断器がオフした後、前記第２のスイッチをオンするようにしたことを特徴とする請求項１または請求項２に記載の電力変換装置。 A circuit breaker provided between an AC power supply and the AC / DC converter,
The protection sequence circuit includes:
When the trigger signal is given, an off command is output to the circuit breaker,
The power converter according to claim 1 or 2, wherein the second switch is turned on after the circuit breaker is turned off. 前記トリガ信号は、
少なくとも直流電圧及び交流電圧の何れか一方が所定の閾値以上になったとき発するようにしたことを特徴とする請求項１乃至請求項３の何れか１項に記載の電力変換装置。 The trigger signal is
The power converter according to any one of claims 1 to 3, wherein the power converter is configured to emit when at least one of a DC voltage and an AC voltage becomes a predetermined threshold value or more. 前記交直変換器を構成するスイッチング素子の短絡故障を検出する故障検出手段を有し、
前記トリガ信号は、
前記故障検出手段が故障を検出したとき発するようにしたことを特徴とする請求項１乃至請求項４の何れか１項に記載の電力変換装置。 A fault detecting means for detecting a short-circuit fault of a switching element constituting the AC / DC converter;
The trigger signal is
The power conversion device according to claim 1, wherein the power conversion device emits when the failure detection unit detects a failure.
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