期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 70, 期 4, 页码 3257-3267出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3177798
关键词
Cascaded H-bridge (CHB) inverter; cell failure; common mode voltage (CMV) reduction; fault compensation
In this article, a common mode voltage (CMV) injection method is proposed to tolerate cell failure for cascaded H-bridge (CHB) inverters. The proposed method aims to balance unequal line-to-line voltages and reduce the impact of injected CMV on load and inverter functionality. It is evaluated through simulation and experimental results obtained from an 11-level CHB converter.
In this article, a common mode voltage (CMV) injection method is proposed to tolerate cell failure for cascaded H-bridge (CHB) inverters. The main purpose of CMV injection is to balance the unequal line-to-line voltages of the inverter without overmodulation when the faulty cells are bypassed. As any injected CMV can interfere with load and inverter proper operation, the proposed fault-tolerant method aims to reduce the peak value and the fundamental harmonic of the injected CMV to minimize its impact on the load and inverter functionality. Also, the proposed method provides features such as simplicity, maximum possible line-to-line voltage, fast real-time calculations, and supporting all faulty cases. The proposed method is evaluated by simulation and experimental results obtained from an 11-level CHB converter.
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