POWER CONVERSION DEVICE AND DRIVE DEVICE

• Main Authors: SHIGETA SATORU, NAKANO HIROSHI, KATSU YASUO, KANEKAWA NOBUYASU, INADA RYOICHI
• Format: Patent
• Language: English; Japanese
• Published: 27.03.2024
• 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 OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROL OR REGULATION THEREOF; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

To realize a power conversion device and a drive device that can accurately detect AC current sensor failure under any motor operating conditions without installing the AC current sensors on all three phases.SOLUTION: An AC current sensor diagnostic unit 108 in a power conversion device 10 includes a first diagnostic unit 1081 that determines an abnormality in an AC current sensor 150 on the basis of a two-phase voltage command value obtained by converting a voltage command value into a value in a two-phase orthogonal coordinate system with one of the output phases as a reference, and a second diagnostic unit 1082 that determines an abnormality in the AC current sensor 150 on the basis of a two-phase current detection value obtained by converting the detection value of the AC current sensor 150 into a value in a two-phase orthogonal coordinate system. The AC current sensor diagnostic unit 108 switches between determining an abnormality by the first diagnostic unit 1081 and determining an abnormality by the second diagnostic unit 1082, depending on the operating conditions of the power conversion device 10.SELECTED DRAWING: Figure 2 【課題】３相全てに交流電流センサを設置することなく、任意のモータ動作条件において交流電流センサの故障を精度よく検知可能な電力変換装置および駆動装置を実現する。【解決手段】電力変換装置１０における交流電流センサ診断部１０８は、電圧指令値をいずれかの出力相を基準とした二相の直交座標系の値に変換した二相電圧指令値に基づいて交流電流センサ１５０の異常を判定する第１診断部１０８１と、交流電流センサ１５０の検出値を二相の直交座標系の値に変換した二相電流検出値に基づいて交流電流センサ１５０の異常を判定する第２診断部１０８２とを有する。交流電流センサ診断部１０８は、電力変換装置１０の動作条件に応じて、第１診断部１０８１による異常の判定と、第２診断部１０８２による異常の判定とを切り替える。【選択図】図２