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| Fault Tolerant Strategy of Four-Leg for Permanent Magnet Synchronous Motor in Case of Open Circuit Fault |
| Meng Yunping1, 2, Zhou Xinxiu1, 2, Li Hong1, 2, Cui Yebing3 |
1. Science and Technology on Inertial Laboratory Beihang University Beijing 100191 China;
2. Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory Beihang University Beijing 100191 China;
3.Shanghai Aerospace Control Technology Research Institute Shanghai 201109 China |
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Abstract This paper proposes a fault tolerant strategy based on four-leg voltage source inverter for the permanent magnet synchronous motor (PMSM) drives system to ensure safe and reliable operation in case of single-phase open circuit. Firstly, due to the relationship of the current and voltage of non-fault phase, the mathematical model of the three-phase four-leg topology is established, and the compensation current of non-fault phase is derived. Then, using the equivalent relationship between the phase compensation current and the zero-axis current, the zero-axis current reference control amount is calculated. Furthermore, in order to overcome the shortcomings of the traditional zero-axis voltage compensation strategy and improve the zero-axis current tracking performance, the design of the zero-axis current closed-loop internal model controller (IMC) based on the desired dynamic and static characteristics, so as to achieve high-precision zero-axis current tracking control. Finally, the simulation and experimental results show that compared with the traditional feedforward zero-axis voltage compensation strategy, the proposed fault tolerant strategy based on four-leg topology has better steady-state characteristics.
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Received: 26 April 2018
Published: 13 August 2019
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2019, Vol. 34 
