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| Reconstructed Voltage Vector Based Improved Direct Torque Control Strategy for Open-Winding Permanent Magnet Synchronous Motor with Common DC Bus |
| Sun Dan, Zhao Chen, Ke Weihuang, Wang Mingze, Nian Heng |
| College of Electrical Engineering Zhejiang University Hangzhou 310027 China |
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Abstract Aiming at the characteristics of open-winding permanent magnet synchronous motor (OW-PMSM) with common DC bus, such as abundant basic voltage vectors and the existence zero sequence circuit, this paper proposed an improved direct torque control strategy based on the reconstructed voltage vector for OW-PMSM with common DC bus. In order to make full use of the voltage vectors generated by OW-PMSM, 19 reconstructed voltage vectors were defined. And based on this, the zero-sequence current suppression method was improved to expand the range of candidate voltage vectors for direct torque control (DTC). According to the characteristics of reconstructed vectors, such as abundant numbers and different amplitudes, a five-bit torque hysteresis controller was introduced into DTC to suppress the torque ripple. Aiming at the problem of limited control precision of hysteresis controller, a new region division method was defined and the corresponding reconstructed voltage vector selection table was established. By locating the reference voltage vector, the reconstructed voltage vector could be selected accurately. The experimental results verify the feasibility and superiority of the proposed control strategy.
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Received: 18 September 2021
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2022, Vol. 37 
