JP4058755B2 - PWM cycloconverter and control method thereof - Google Patents

PWM cycloconverter and control method thereof Download PDF

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JP4058755B2
JP4058755B2 JP2002113977A JP2002113977A JP4058755B2 JP 4058755 B2 JP4058755 B2 JP 4058755B2 JP 2002113977 A JP2002113977 A JP 2002113977A JP 2002113977 A JP2002113977 A JP 2002113977A JP 4058755 B2 JP4058755 B2 JP 4058755B2
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power supply
phase
supply phase
detector
abnormality
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JP2003309974A (en
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栄治 山本
英則 原
俊求 姜
英司 渡辺
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Yaskawa Electric Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、交流電源から任意の周波数へ出力変換可能な電力変換装置に関し、特にパルス幅変調（ＰＷＭ）制御方式を用いたＰＷＭサイクロコンバータとそのの制御方法に関する。
【０００２】
【従来の技術】
従来技術について説明する。ＰＷＭサイクロコンバータは入力電源と出力が直接双方向に電流が流せる双方向スイッチを介して直接接続されている。したがって、欠相、停電、電源不平衡等の入力電源の異常が発生した場合、入力電源の異常を検出し運転を停止しなければならない。入力電源の異常検出方法としては、「電源電圧異常検出方法（特開2001−258151号公報）」等が知られている。
従来のＰＷＭサイクロコンバータの回路構成図を図２に示す。図において三相電源１は入力フィルタ２を介して双方向スイッチ群３に接続される。双方向スイッチ群３は、双方向スイッチＳ１〜Ｓ９で構成される。現在、双方向に電力が流せ、逆耐圧特性を持ったパワーデバイスがないため、各双方向スイッチは、例えば図３に示すように逆並列に接続された、ダイオードＤ１、Ｄ２とＩＧＢＴ１、２から構成される。双方向スイッチＳ１〜Ｓ９の出力は負荷Ｌ１〜Ｌ３に接続される。ＰＷＭサイクロコンバータの制御コントローラ８は、電源異常検出器４、通常電源位相検出器５の入力を持ち、ゲートドライバ９へゲート信号を出力する。ゲートドライバ９は、ゲート信号に基づいて各双方向スイッチＳ１〜Ｓ９を駆動する。通常電源位相検出器５の詳細を図４に示す。通常電源位相検出器５は、三相電源１のうち２相を入力とし、電源の位相を検出する。入力電圧のうち二相分は、トランス１００を介してコンパレータ１０１に入力され、ＰＦＤ１０２、フィルタ１０３、ＶＣＯ１０４、カウンタ１０５に入力され、位相データとなる。カウンタ１０５の最上位ビット（ＭＳＢ）は、ＰＦＤ１０２にフィードバックされ、ＰＬＬ回路を構成する。もちろん、入力電圧の位相を検出する手段は、図５に示すものだけでなく、コンパレータ１０１出力の矩形波のエッジからエッジまでをタイマーによって計測する方法や，入力電圧の瞬時値をCPUにAD変換して取り込み，ソフトウェアで位相を検出してもよい。電源異常検出器４は、三相電源１に欠相、停電、不平衡といった異常が検出された場合、電源異常情報を制御コントローラ８に伝える。従来例では、電源異常が検出された場合、制御コントローラ８は、各双方向スイッチＳ１〜Ｓ９を停止させるために、ゲートドライバ９に運転停止用ゲート信号を出力する。通常、双方向スイッチＳ１〜Ｓ９を停止するためには、すべてのスイッチを”開”とする。この動作を今後ゲートブロックと呼ぶ。従来例のＰＷＭサイクロコンバータの電源異常時の運転について図５を用いて説明する。電源異常が発生した場合、即座にゲートブロックし、電源異常が解除されると通常運転に復帰する。
上述のとおり入力電源の異常を検出し、電源異常時にすみやかにＰＷＭサイクロコンバータの動作を停止させることが可能となる。
【０００３】
【発明が解決しようとする課題】
ところが、従来の構成では電源異常時、ＰＷＭサイクロコンバータの運転を停止させることは出来るが、例えば、電源が電源周波数１〜２周期の間停電した場合（以下瞬停と呼ぶ）でも、運転を継続させることができない。本発明はこの問題点に鑑みてなされたものであり、その目的はＰＷＭサイクロコンバータ運転時、電源異常、特に瞬停が発生し復電した時、すみやかに運転が継続できるようにすることにある。
【０００４】
【課題を解決するための手段】
上記問題点を解決するため本発明は、三相交流電源の各相と三相出力の電力変換器の各相とを電流が一方向だけ流せる片方向半導体スイッチを２個組み合わせた構成で、かつ各々が独立にオンオフできる構成とする双方向半導体スイッチで直接接続する電力変換器であるＰＷＭサイクロコンバータであって、入力電源の異常を検出する電源異常検出器と、入力電圧の位相を検出する通常電源位相検出器と、前記入力電圧の瞬時値の大小関係から電源位相を計算する瞬時電源位相検出器と、前記入力位相として前記通常電源位相検出器の出力と前記瞬時電源位相検出器の出力のうちどちらか一方を選択する電源位相選択器とからなり、前記電源異常検出器が異常を検出しない場合は、前記電源位相選択器は前記通常電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常を検出した場合は、前記電源位相選択器は前記瞬時電源位相検出器で求められる電源位相を入力電源位相とする手段からなるＰＷＭサイクロコンバータにおいて、
前記電源異常検出器が異常を検出した際は、即座に前記電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ１後に前記通常電源位相検出器で求められる電源位相を入力電源位相とする手段を備える。
また、請求項１において、前記電源異常検出器が異常を検出した際は、即座に前記通常電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とするとともに、前記ＰＷＭサイクロコンバータの前記双方向半導体スイッチ素子を開き、ゲートブロック状態とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ２（Ｔ１≧Ｔ２とする）後に、前記半導体スイッチ素子を通常運転し、前記設定時間Ｔ１後に前記電源位相選択器を前記電源位相検出器で求められる電源位相を入力電源位相とする手段からなる。
また、三相交流電源の各相と三相出力の電力変換器の各相とを電流が一方向だけ流せる片方向半導体スイッチを２個組み合わせた構成で、かつ各々が独立にオンオフできる構成とする双方向半導体スイッチで直接接続する電力変換器であるＰＷＭサイクロコンバータの制御方法であって、電源異常検出器で入力電源の異常を検出し、通常電源位相検出器で入力電圧の位相を検出し、瞬時電源位相検出器で前記入力電圧の瞬時値の大小関係から電源位相を計算し、電源位相選択器で前記入力位相として前記通常電源位相検出器の出力と前記瞬時電源位相検出器の出力のうちどちらか一方を選択し、前記電源異常検出器が異常を検出しない場合は、前記電源位相選択器は前記通常電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常を検出した場合は、前記電源位相選択器は前記瞬時電源位相検出器で求められる電源位相を入力電源位相とするＰＷＭサイクロコンバータの制御方法において、
前記電源異常検出器が異常を検出した際は、即座に前記電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ１後に前記通常電源位相検出器で求められる電源位相を入力電源位相とする。
また、請求項３において、前記電源異常検出器が異常を検出した際は、即座に前記通常電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とするとともに、前記ＰＷＭサイクロコンバータの前記双方向半導体スイッチ素子を開き、ゲートブロック状態とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ２（Ｔ１≧Ｔ２とする）後に、前記半導体スイッチ素子を通常運転し、前記設定時間Ｔ１後に前記電源位相選択器を前記電源位相検出器で求められる電源位相を入力電源位相とする。
上記手段により、ＰＷＭサイクロコンバータ運転時、電源異常、特に瞬停が発生し復電した時、すみやかに運転が継続できる。
【０００５】
【発明の実施の形態】
本発明の実施例を図に基づいて説明する。図１に本発明のＰＷＭサイクロコンバータの回路構成図を示す。本発明の構成（図１）が従来の構成（図２）と異なる部分は、瞬時電源位相検出器６、電源位相選択器７、タイマＴ１とタイマＴ２からなるタイマ手段の部分である。従来と同じ名称には同一符号を付け重複説明を省略する。三相電源１に接続されその異常を検出する電源異常検出器４から出される異常検出信号は、タイマＴ１、Ｔ２を通過し電源位相選択器７に入力される。タイマーＴ１、Ｔ２は電源異常状態から正常状態に戻った場合に動作する。また、タイマーＴ１、Ｔ２はＴ１≧Ｔ２となるようにあらかじめ設定する。
【０００６】
電源異常検出器４が異常を検出した場合は、タイマーＴ１、Ｔ２通過信号もそれぞれ即座に異常検出するが、電源異常検出器４が正常検出に戻った場合は、まずタイマーＴ２通過信号が正常となり、次にタイマーＴ１通過信号が正常となる。瞬時電源位相検出器６では、入力電圧の瞬時値から入力電圧の位相を計算する。計算結果は電源１周期を１２分割した区間（３０度の範囲）として計算される。計算フローを図９に示す。区間１と区間２を判別するには、まず入力電圧Ｖｒの正負を判別する。Ｖｒが０以上である場合、Ｖｓの正負を判別する。Ｖｓが０以上である場合、Ｖｒ−Ｖｓの正負を判別する。結果が０以上であれば、区間１となり、負であれば、区間２となる。同様に残りの区間もＶｒ、Ｖｓ、Ｖｔの大小関係からすべて求めることができる。
【０００７】
（ステップ１）電源異常時、図６に示すように入力位相を通常電源位相検出器５の出力θ１から、瞬時電源位相検出器６の出力θ２に切り替える。
（ステップ２）正常状態に戻る際、図７に示すようにＴ１時間経過するまで瞬時電源位相検出器６の出力θ２を用いる。この理由は、電源異常検出器４が正常と判断しても実際の入力電源電圧の値が不安定な場合があるためです。PWMサイクロコンバータの入力にはリアクトルとコンデンサから成るフィルタ回路を有しているため電源が復電した時に突入電流が流れ電圧・電流に大きなリプル成分が含まれます。そのため通常電源位相検出器５の出力θ１では、位相を誤検出する場合があるためである。
（ステップ３）異常検出すると、図８に示すように瞬時電源位相検出器６の出力θ２に切り替えるとともにベースブロックし、正常状態に戻った際、Ｔ２時間後に双方向スイッチ群３を通常運転に戻し（ベースブロック解除し）、Ｔ１時間経過後に、入力位相として瞬時電源位相検出器６の出力θ２を用いる。
【０００８】
【発明の効果】
本発明によれば、三相交流電源の各相と三相出力の電力変換器の各相とを電流が一方向だけ流せる片方向半導体スイッチを２個組み合わせた構成で、かつ各々が独立にオンオフできる構成とする双方向半導体スイッチで直接接続する電力変換器であるＰＷＭサイクロコンバータにおいて、入力電源の異常を検出する電源異常検出器と、入力電圧の位相を検出する通常電源位相検出器と、前記入力電圧の瞬時値の大小関係から電源位相を計算する瞬時電源位相検出器と、前記入力位相として前記通常電源位相検出器の出力と前記瞬時電源位相検出器の出力のうちどちらか一方を選択する電源位相選択器とからなり、前記電源異常検出器が異常を検出しない場合は、前記電源位相選択器は前記通常電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常を検出した場合は、前記電源位相選択器は前記瞬時電源位相検出器で求められる電源位相を入力電源位相とする手段を備えたので、ＰＷＭサイクロコンバータ運転時、電源異常、特に瞬停が発生し復電した時、すみやかに運転を継続できる。
【図面の簡単な説明】
【図１】本発明のＰＷＭサイクロコンバータの構成図
【図２】従来のＰＷＭサイクロコンバータの構成図
【図３】双方向半導体スイッチの構成の一例
【図４】通常電源位相検出器の詳細ブロック図
【図５】従来の電源異常時の運転動作図
【図６】本発明の電源異常時の運転動作図（請求項１）
【図７】本発明の電源異常時の運転動作図（請求項２）
【図８】本発明の電源異常時の運転動作図（請求項３）
【図９】瞬時電源位相検出器の詳細フローチャート
【符号の説明】
１ 三相電源
２ 入力フィルタ
３ 双方向スイッチ群
４ 電源異常検器
５ 通常電源位相検出器
６ 異常電源位相検出器
７ 電源位相選択器
８ 制御コントローラ
９ ゲートドライバ
Ｌ１、Ｌ２、Ｌ３ 負荷
Ｓ１〜Ｓ９ 双方向スイッチ
１００ トランス
１０１ コンパレータ
１０２ ＰＦＤ
１０３ フィルタ
１０４ ＶＣＯ
１０５ カウンタ
Ｄ１、Ｄ２ ダイオード
ＩＧＢＴ１、ＩＧＢＴ２ 絶縁ゲート型バイポーラトランジスタ（ＩＧＢＴ）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power converter that can convert an output from an AC power source to an arbitrary frequency, and more particularly to a PWM cycloconverter using a pulse width modulation (PWM) control method and a control method thereof.
[0002]
[Prior art]
Prior art will be described. In the PWM cycloconverter, the input power supply and the output are directly connected via a bidirectional switch that allows current to flow in both directions. Therefore, when an input power supply abnormality such as a phase loss, power failure, or power supply imbalance occurs, the input power supply abnormality must be detected and the operation must be stopped. As an input power supply abnormality detection method, a “power supply voltage abnormality detection method (Japanese Patent Laid-Open No. 2001-258151)” or the like is known.
A circuit configuration diagram of a conventional PWM cycloconverter is shown in FIG. In the figure, a three-phase power source 1 is connected to a bidirectional switch group 3 via an input filter 2. The bidirectional switch group 3 includes bidirectional switches S1 to S9. At present, since there is no power device that can flow power in both directions and has reverse breakdown voltage characteristics, each bidirectional switch includes, for example, diodes D1, D2 and IGBTs 1, 2 connected in antiparallel as shown in FIG. Composed. Outputs of the bidirectional switches S1 to S9 are connected to loads L1 to L3. The controller 8 of the PWM cycloconverter has inputs of the power supply abnormality detector 4 and the normal power supply phase detector 5 and outputs a gate signal to the gate driver 9. The gate driver 9 drives each bidirectional switch S1 to S9 based on the gate signal. Details of the normal power supply phase detector 5 are shown in FIG. The normal power supply phase detector 5 receives two phases of the three-phase power supply 1 and detects the phase of the power supply. Two phases of the input voltage are input to the comparator 101 via the transformer 100 and input to the PFD 102, the filter 103, the VCO 104, and the counter 105, and become phase data. The most significant bit (MSB) of the counter 105 is fed back to the PFD 102 to constitute a PLL circuit. Of course, the means for detecting the phase of the input voltage is not limited to the one shown in FIG. 5, but a method of measuring from the edge of the rectangular wave output from the comparator 101 with a timer, or the instantaneous value of the input voltage is AD converted to the CPU. And the phase may be detected by software. The power supply abnormality detector 4 transmits power supply abnormality information to the controller 8 when an abnormality such as a phase failure, power failure, or unbalance is detected in the three-phase power supply 1. In the conventional example, when a power supply abnormality is detected, the controller 8 outputs an operation stop gate signal to the gate driver 9 in order to stop the bidirectional switches S1 to S9. Normally, in order to stop the bidirectional switches S1 to S9, all the switches are opened. This operation is hereinafter referred to as a gate block. The operation of the conventional PWM cycloconverter when the power supply is abnormal will be described with reference to FIG. When a power supply abnormality occurs, the gate is immediately blocked, and when the power supply abnormality is cleared, normal operation is resumed.
As described above, it is possible to detect an abnormality of the input power supply and to quickly stop the operation of the PWM cycloconverter when the power supply is abnormal.
[0003]
[Problems to be solved by the invention]
However, in the conventional configuration, the operation of the PWM cycloconverter can be stopped when the power supply is abnormal, but the operation is continued even when the power supply is interrupted for 1 to 2 cycles of the power supply frequency (hereinafter referred to as instantaneous power failure). I can't let you. The present invention has been made in view of this problem, and an object of the present invention is to make it possible to continue the operation promptly when the PWM cycloconverter is operated, when a power supply abnormality occurs, particularly when an instantaneous power failure occurs and power is restored. .
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has a configuration in which two unidirectional semiconductor switches that allow current to flow in only one direction each phase of a three-phase AC power source and each phase of a three-phase output power converter are combined, and a PWM cycloconverter is a power converter which connects directly with the bidirectional semiconductor switches configured to each be turned on and off independently, and power failure detector for detecting an abnormality of the input power, usually to detect the phase of the input voltage A power supply phase detector, an instantaneous power supply phase detector for calculating a power supply phase from the magnitude relationship of instantaneous values of the input voltage, and an output of the normal power supply phase detector and an output of the instantaneous power supply phase detector as the input phase. A power supply phase selector that selects one of them, and when the power supply abnormality detector does not detect abnormality, the power supply phase selector is obtained by the normal power supply phase detector. The source phase as an input power supply phase, when the power failure detector has detected an abnormality, the power supply phase selector is PWM cycloconverter comprises means for the input power supply phase power phase obtained by the instantaneous power phase detector In
When the power supply abnormality detector detects an abnormality, the power supply phase selector immediately sets the power supply phase required by the instantaneous power supply phase detector as the input power supply phase, and the power supply abnormality detector switches from abnormality detection to normal detection. When switching, means for setting the power supply phase obtained by the normal power supply phase detector after the set time T1 as the input power supply phase is provided.
Further, in claim 1, when the power supply abnormality detector detects an abnormality, the normal power supply phase selector immediately sets the power supply phase obtained by the instantaneous power supply phase detector as the input power supply phase, and the PWM When the bidirectional semiconductor switch element of the cycloconverter is opened to be in a gate block state and the power supply abnormality detector is switched from abnormality detection to normal detection, after the set time T2 (T1 ≧ T2), the semiconductor switch element The power supply phase selector includes a power supply phase obtained by the power supply phase detector after the set time T1 as an input power supply phase.
In addition, it has a configuration in which two unidirectional semiconductor switches that allow current to flow only in one direction through each phase of the three-phase AC power source and each phase of the three-phase output power converter, and each can be turned on and off independently. It is a control method of a PWM cycloconverter that is a power converter that is directly connected by a bidirectional semiconductor switch, detecting an abnormality of the input power supply with a power supply abnormality detector, detecting a phase of the input voltage with a normal power supply phase detector, The power supply phase is calculated from the magnitude relationship between the instantaneous values of the input voltage by the instantaneous power supply phase detector, and the output of the normal power supply phase detector and the output of the instantaneous power supply phase detector are used as the input phase by the power supply phase selector. When either one is selected and the power supply abnormality detector does not detect an abnormality, the power supply phase selector uses the power supply phase obtained by the normal power supply phase detector as the input power supply phase, and If anomaly detector detects an abnormality, the power supply phase selector is a control method of a PWM cycloconverter which receives supply phase power phase obtained by the instantaneous power phase detector,
When the power supply abnormality detector detects an abnormality, the power supply phase selector immediately sets the power supply phase required by the instantaneous power supply phase detector as the input power supply phase, and the power supply abnormality detector switches from abnormality detection to normal detection. When switching, the power supply phase obtained by the normal power supply phase detector after the set time T1 is set as the input power supply phase.
Further, in claim 3, when the power supply abnormality detector detects an abnormality, the normal power supply phase selector immediately sets the power supply phase obtained by the instantaneous power supply phase detector as the input power supply phase, and the PWM When the bidirectional semiconductor switch element of the cycloconverter is opened to be in a gate block state and the power supply abnormality detector is switched from abnormality detection to normal detection, after the set time T2 (T1 ≧ T2), the semiconductor switch element Is normally operated, and after the set time T1, the power supply phase selector determines the power supply phase obtained by the power supply phase detector as the input power supply phase.
By the above means, when the PWM cycloconverter is operated, when the power supply abnormality occurs, particularly when an instantaneous power failure occurs and power is restored, the operation can be continued immediately.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a circuit configuration diagram of a PWM cycloconverter according to the present invention. The portion of the configuration of the present invention (FIG. 1) is different from the conventional configuration (FIG. 2) in the portion of the timer means comprising the instantaneous power phase detector 6, power phase selector 7, timer T1 and timer T2. The same reference numerals are assigned to the same names as in the prior art, and duplicate descriptions are omitted. An abnormality detection signal output from a power supply abnormality detector 4 connected to the three-phase power supply 1 and detecting the abnormality passes through the timers T1 and T2 and is input to the power supply phase selector 7. The timers T1 and T2 operate when the power supply is returned from the abnormal state to the normal state. The timers T1 and T2 are set in advance so that T1 ≧ T2.
[0006]
When the power supply abnormality detector 4 detects an abnormality, the timer T1 and T2 passage signals are also immediately detected, but when the power supply abnormality detector 4 returns to normal detection, the timer T2 passage signal first becomes normal. Next, the timer T1 passage signal becomes normal. The instantaneous power supply phase detector 6 calculates the phase of the input voltage from the instantaneous value of the input voltage. The calculation result is calculated as a section (range of 30 degrees) obtained by dividing one cycle of the power supply into twelve. The calculation flow is shown in FIG. In order to discriminate between the section 1 and the section 2, first, the sign of the input voltage Vr is discriminated. When Vr is 0 or more, the sign of Vs is determined. When Vs is 0 or more, the sign of Vr−Vs is determined. If the result is greater than or equal to 0, it becomes section 1, and if it is negative, it becomes section 2. Similarly, all the remaining sections can be obtained from the magnitude relationship among Vr, Vs, and Vt.
[0007]
(Step 1) When the power supply is abnormal, the input phase is switched from the output θ1 of the normal power supply phase detector 5 to the output θ2 of the instantaneous power supply phase detector 6 as shown in FIG.
(Step 2) When returning to the normal state, the output θ2 of the instantaneous power supply phase detector 6 is used until T1 time elapses as shown in FIG. This is because the actual input power supply voltage value may be unstable even if the power failure detector 4 is judged normal. Since the input of the PWM cycloconverter has a filter circuit consisting of a reactor and a capacitor, an inrush current flows when the power is restored and a large ripple component is included in the voltage and current. This is because the phase may be erroneously detected at the output θ1 of the normal power supply phase detector 5.
(Step 3) When an abnormality is detected, as shown in FIG. 8, the output is switched to the output θ2 of the instantaneous power supply phase detector 6 and the base block is performed. When the normal state is restored, the bidirectional switch group 3 is returned to the normal operation after T2 hours. (The base block is released), and after the elapse of T1, the output θ2 of the instantaneous power supply phase detector 6 is used as the input phase.
[0008]
【The invention's effect】
According to the present invention, two unidirectional semiconductor switches that allow current to flow in only one direction each phase of a three-phase AC power supply and each phase of a three-phase output power converter are combined, and each is turned on and off independently. In a PWM cycloconverter that is a power converter directly connected by a bidirectional semiconductor switch having a configuration that can be configured, a power supply abnormality detector that detects an abnormality of an input power supply, a normal power supply phase detector that detects a phase of an input voltage, and An instantaneous power supply phase detector that calculates the power supply phase from the magnitude relationship of the instantaneous value of the input voltage, and one of the output of the normal power supply phase detector and the output of the instantaneous power supply phase detector is selected as the input phase When the power supply abnormality detector does not detect any abnormality, the power supply phase selector inputs the power supply phase required by the normal power supply phase detector to the input power supply. And when the power supply abnormality detector detects an abnormality, the power supply phase selector has means for setting the power supply phase obtained by the instantaneous power supply phase detector as the input power supply phase. When a power failure occurs, especially when an instantaneous power failure occurs and power is restored, the operation can be continued immediately.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a PWM cycloconverter according to the present invention. FIG. 2 is a configuration diagram of a conventional PWM cycloconverter. FIG. 3 is an example of a configuration of a bidirectional semiconductor switch. FIG. 5 is a diagram showing a conventional operation when an abnormality occurs in the power supply. FIG. 6 is a diagram showing an operation when the power supply is abnormal according to the present invention.
FIG. 7 is a diagram showing the operation when the power supply is abnormal according to the present invention.
FIG. 8 is a diagram showing the operation when the power supply is abnormal according to the present invention.
FIG. 9 is a detailed flowchart of the instantaneous power supply phase detector.
DESCRIPTION OF SYMBOLS 1 Three-phase power supply 2 Input filter 3 Bidirectional switch group 4 Power supply abnormality detector 5 Normal power supply phase detector 6 Abnormal power supply phase detector 7 Power supply phase selector 8 Control controller 9 Gate drivers L1, L2, L3 Both loads S1-S9 Direction switch 100 Transformer 101 Comparator 102 PFD
103 Filter 104 VCO
105 Counter D1, D2 Diode IGBT1, IGBT2 Insulated gate bipolar transistor (IGBT)

Claims (4)

三相交流電源の各相と三相出力の電力変換器の各相とを電流が一方向だけ流せる片方向半導体スイッチを２個組み合わせた構成で、かつ各々が独立にオンオフできる構成とする双方向半導体スイッチで直接接続する電力変換器であるＰＷＭサイクロコンバータであって、入力電源の異常を検出する電源異常検出器と、入力電圧の位相を検出する通常電源位相検出器と、前記入力電圧の瞬時値の大小関係から電源位相を計算する瞬時電源位相検出器と、前記入力位相として前記通常電源位相検出器の出力と前記瞬時電源位相検出器の出力のうちどちらか一方を選択する電源位相選択器とからなり、前記電源異常検出器が異常を検出しない場合は、前記電源位相選択器は前記通常電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常を検出した場合は、前記電源位相選択器は前記瞬時電源位相検出器で求められる電源位相を入力電源位相とする手段からなるＰＷＭサイクロコンバータにおいて、
前記電源異常検出器が異常を検出した際は、即座に前記電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ１後に前記通常電源位相検出器で求められる電源位相を入力電源位相とする手段からなることを特徴とするＰＷＭサイクロコンバータ。 Bi-directional configuration that combines two one-way semiconductor switches that allow each phase of a three-phase AC power supply and each phase of a three-phase output power converter to flow in only one direction, and each can be turned on and off independently. a PWM cycloconverter is a power converter for directly connecting a semiconductor switch, a power failure detector for detecting an abnormality of the input power, and normal power supply phase detector for detecting a phase of the input voltage, the instantaneous of the input voltage Instantaneous power supply phase detector for calculating a power supply phase from the magnitude relationship of values, and a power supply phase selector for selecting either the output of the normal power supply phase detector or the output of the instantaneous power supply phase detector as the input phase When the power supply abnormality detector does not detect any abnormality, the power supply phase selector uses the power supply phase obtained by the normal power supply phase detector as the input power supply phase, and If anomaly detector detects an abnormality, the power supply phase selector in PWM cycloconverter comprises means for the input power supply phase power phase obtained by the instantaneous power phase detector,
When the power supply abnormality detector detects an abnormality, the power supply phase selector immediately sets the power supply phase required by the instantaneous power supply phase detector as the input power supply phase, and the power supply abnormality detector switches from abnormality detection to normal detection. A PWM cycloconverter comprising means for setting an input power supply phase to a power supply phase obtained by the normal power supply phase detector after a set time T1 when switching. 前記電源異常検出器が異常を検出した際は、即座に前記通常電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とするとともに、前記ＰＷＭサイクロコンバータの前記双方向半導体スイッチ素子を開き、ゲートブロック状態とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ２（Ｔ１≧Ｔ２とする）後に、前記半導体スイッチ素子を通常運転し、前記設定時間Ｔ１後に前記電源位相選択器を前記電源位相検出器で求められる電源位相を入力電源位相とする手段からなることを特徴とする請求項１記載のＰＷＭサイクロコンバータ。  When the power supply abnormality detector detects an abnormality, the normal power supply phase selector immediately uses the power supply phase required by the instantaneous power supply phase detector as an input power supply phase, and the bidirectional semiconductor of the PWM cycloconverter. When the switch element is opened to be in a gate block state and the power supply abnormality detector is switched from abnormality detection to normal detection, the semiconductor switch element is normally operated after a set time T2 (T1 ≧ T2) and the setting is performed. 2. A PWM cycloconverter according to claim 1, wherein said power supply phase selector comprises means for setting a power supply phase obtained by said power supply phase detector after said time T1 as an input power supply phase. 三相交流電源の各相と三相出力の電力変換器の各相とを電流が一方向だけ流せる片方向半導体スイッチを２個組み合わせた構成で、かつ各々が独立にオンオフできる構成とする双方向半導体スイッチで直接接続する電力変換器であるＰＷＭサイクロコンバータの制御方法であって、電源異常検出器で入力電源の異常を検出し、通常電源位相検出器で入力電圧の位相を検出し、瞬時電源位相検出器で前記入力電圧の瞬時値の大小関係から電源位相を計算し、電源位相選択器で前記入力位相として前記通常電源位相検出器の出力と前記瞬時電源位相検出器の出力のうちどちらか一方を選択し、前記電源異常検出器が異常を検出しない場合は、前記電源位相選択器は前記通常電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常を検出した場合は、前記電源位相選択器は前記瞬時電源位相検出器で求められる電源位相を入力電源位相とするＰＷＭサイクロコンバータの制御方法において、
前記電源異常検出器が異常を検出した際は、即座に前記電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ１後に前記通常電源位相検出器で求められる電源位相を入力電源位相とすることを特徴とするＰＷＭサイクロコンバータの制御方法。 Bi-directional configuration that combines two one-way semiconductor switches that allow each phase of a three-phase AC power supply and each phase of a three-phase output power converter to flow in only one direction, and each can be turned on and off independently. A PWM cycloconverter control method that is a power converter directly connected by a semiconductor switch. It detects an input power supply abnormality with a power supply abnormality detector, detects a phase of the input voltage with a normal power supply phase detector, and instantaneous power supply. The phase detector calculates the power supply phase from the magnitude relationship of the instantaneous value of the input voltage, and the power supply phase selector selects either the output of the normal power supply phase detector or the output of the instantaneous power supply phase detector as the input phase. If one is selected and the power supply abnormality detector does not detect any abnormality, the power supply phase selector uses the power supply phase obtained by the normal power supply phase detector as the input power supply phase, and the power supply abnormality If the output device detects an abnormality, the power supply phase selector is a control method of a PWM cycloconverter which receives supply phase power phase obtained by the instantaneous power phase detector,
When the power supply abnormality detector detects an abnormality, the power supply phase selector immediately sets the power supply phase required by the instantaneous power supply phase detector as the input power supply phase, and the power supply abnormality detector switches from abnormality detection to normal detection. A control method for a PWM cycloconverter, characterized in that, when switched, a power supply phase obtained by the normal power supply phase detector after a set time T1 is set as an input power supply phase. 前記電源異常検出器が異常を検出した際は、即座に前記通常電源位相選択器を前記瞬時電源位相検出器で求められる電源位相を入力電源位相とするとともに、前記ＰＷＭサイクロコンバータの前記双方向半導体スイッチ素子を開き、ゲートブロック状態とし、前記電源異常検出器が異常検出から正常検出へ切り替わった際は、設定時間Ｔ２（Ｔ１≧Ｔ２とする）後に、前記半導体スイッチ素子を通常運転し、前記設定時間Ｔ１後に前記電源位相選択器を前記電源位相検出器で求められる電源位相を入力電源位相とすることを特徴とする請求項３記載のＰＷＭサイクロコンバータの制御方法。When the power supply abnormality detector detects an abnormality, the normal power supply phase selector immediately uses the power supply phase required by the instantaneous power supply phase detector as an input power supply phase, and the bidirectional semiconductor of the PWM cycloconverter. When the switch element is opened to be in a gate block state and the power supply abnormality detector is switched from abnormality detection to normal detection, the semiconductor switch element is normally operated after a set time T2 (T1 ≧ T2) and the setting is performed. 4. The method of controlling a PWM cycloconverter according to claim 3 , wherein the power supply phase selector uses the power supply phase obtained by the power supply phase detector after time T1 as an input power supply phase.
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