volume | PIER Journals

Abstract

To address the issues of decreased electromagnetic torque, poor robustness, and failure of demagnetization fault detection caused by permanent magnet demagnetization and inductance mismatch in interior permanent magnet synchronous motor (IPMSM), a robust deadbeat fault-tolerant predictive current control (RDFTPCC) strategy based on cascade flux linkage observer (CFO) is proposed. The proposed CFO is constructed by combining a discrete model reference adaptive system (MRAS) with an improved non-singular fast terminal sliding mode observer (INFTSMO). MRAS and INFTSMO perform d-q axis inductance estimation and demagnetization fault detection, respectively. A better current prediction can be obtained via the parameter state information from CFO. Moreover, the RDFTPCC is constructed by the state information obtained from CFO, which can compensate for the torque deficit due to permanent magnet demagnetization and the control performance degradation due to parameter mismatch, hence realizing fault-tolerant control. The experimental results indicate that the proposed method exhibits stronger fault-tolerance and robustness than the conventional method when the IPMSM suffers from demagnetization fault and inductance mismatch.

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Dr. Dingdou Wen

Dr. Xiaorui Wei

Dr. Xincheng Zhu

Dr. Chuandong Shi

Dr. Wenting Zhang

Dr. Zhun Cheng