Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Open-circuit fault diagnosis for OEW-PMSM drives based on finite-control-set model predictive control

  • Li, Tuhuan (School of Electric Power, South China University of Technology) ;
  • Du, Guiping (School of Electric Power, South China University of Technology) ;
  • Lei, Yanxiong (School of Electric Power, South China University of Technology) ;
  • Chen, Siqiang (School of Electric Power, South China University of Technology)
  • Received : 2021.07.25
  • Accepted : 2021.11.25
  • Published : 2022.02.20
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Abstract

An open-end winding permanent magnet synchronous motor (OEW-PMSM) fed by dual inverters has good application value in the drive system of electric vehicles due to the motor's advantages, such as high output power, wide speed range and excellent fault-tolerant ability. However, the symmetry of dual-inverter topology causes difficulty in identifying the specific faulty switch when an open-circuit fault occurs. Thus, this study proposes a switch open-circuit fault diagnosis strategy for OEW-PMSM based on finite-control-set model predictive control (FCS-MPC). With the known and unchanged switching state in each control period of FCS-MPC, the proposed strategy uses the predicted switching state to predict the phase voltage. According to the error of predicted voltage and measured voltage under switch failure, the faulty phase and faulty switch pair are identified. Finally, the relationship between switching states and error voltage is analyzed, and a diagnosis function is constructed to identify the specific faulty switch. The validity of the proposed diagnosis strategy is confirmed by the simulation and experimental results.

Keywords

Acknowledgement

This work was supported by the Guangdong Provincial Natural Science Research Team Project: New Energy Efficient Electrical Energy Conversion, 2017B030312001.

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