MATRIX CONVERTER

• Main Authors: EBISU JOJI, IWAHASHI KOJI, KINOMURA HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 23.04.2015
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To switch commutation control while preventing precision of an output voltage from being reduced by a commutation failure, even after the commutation control is started.SOLUTION: A matrix converter includes a power conversion part, a command generation part and a commutation control part. The power conversion part includes a plurality of bidirectional switches between a plurality of input terminals connected to phases of an AC power source and a plurality of output terminals connected to phases of a load. The commutation control part performs the commutation control by controlling the plurality of switching elements in accordance with a commutation pattern including a plurality of steps in the case where a control command is changed. Further, in the case where the control command is changed during the execution of the commutation control, the commutation control part executes a takeover step of turning on one switching element that forms the bidirectional switch, to be a switching destination of the next commutation control, and then starts executing the next commutation control from a step in the middle. 【課題】転流制御を開始した後であっても転流失敗による出力電圧の精度低下を抑制しつつ転流制御の切り替えを行うこと。【解決手段】実施形態に係るマトリクスコンバータは、電力変換部と、指令生成部と、転流制御部と、を備える。電力変換部は、交流電源の各相に接続される複数の入力端子と負荷の各相に接続される複数の出力端子との間に複数の双方向スイッチを有する。転流制御部は、制御指令が変化した場合に複数のステップを有する転流パターンで複数のスイッチング素子を制御して転流制御を行う。さらに、転流制御部は、転流制御を実行中に制御指令が変化した場合、次の転流制御の切り替え先となる双方向スイッチを構成する一つのスイッチング素子をオンにする引継ステップを実行した後、途中のステップから次の転流制御を実行する。【選択図】図３