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| Current Harmonics and Torque Ripple Suppression of Six-Phase Open-Winding Permanent Magnet Synchronous Motor Based on Complex Vector Set Preference |
| Peng Yuhang1,2, Sun Chen1,2, Yuan Wenhui1,2, Gong Jinwu1,2, Huang Meng1,2, Zha Xiaoming1,2 |
1. Hubei Key Laboratory of Power Equipment &System Security for Integrated Energy Wuhan 430072 China;
2. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China |
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Abstract Multi-phase open-winding permanent magnet synchronous motors (OEW-PMSMs) have many advantages, such as small power-sharing per phase, high voltage utilization, and high fault-tolerance performance. However, the multiphase OEW-PMSM requires comprehensive suppression of multi-harmonic plane components and ZSC suppression. Conventional methods using harmonic current loops or harmonics are challenging to realize effective control when facing multiphase OEW-PMSM. This paper proposes a space vector pulse width modulation (SVPWM) method based on complex vector set preference for a six-phase open-winding permanent magnet synchronous motor (SOEW-PMSM) drive system, which avoids the generation of the third harmonic at the output and suppresses the fifth harmonic.
Firstly, the method considers the 3rd and 5th harmonics in the transformation matrix to achieve high- accuracy modeling of SOEW-PMSM. The plane decomposition is performed based on the vector space decomposition method. The space voltage vectors generated by different switching combinations of the 6-phase H-bridge inverter are analyzed. The spatial voltage vectors are projected to each harmonic plane. The spatial voltage vectors with zero projected components in the 3rd harmonic plane are filtered out as the alternative vectors for SVPWM. Secondly, the proportionality relationship between the alternative vectors in the 5th harmonic plane projection is analyzed, and the action time of each vector is assigned through the proportionality relationship. High-precision suppression of the 3rd and 5th harmonic currents is realized. After finding the action time of each vector, the appropriate bridge arm PWM waveforms for each sector are plotted, and the left and right switching tubes are controlled using two sets of PWM waves, avoiding multiple jumps of the switching tubes in one cycle. Finally, a 50 kW-class SOEW-PMSM pair-tow experimental platform was constructed to compare the proposed control method with the traditional vector control and harmonic current loop methods.
The experimental results indicate that the method selects switching tube combinations and voltage vectors with zero synthesized components in the 3rd harmonic plane for the space voltage vector selection. It can better suppress the 3rd harmonic while suppressing the 5th harmonic by calculating the action time of each vector. The 3rd harmonic content of the phase current can be reduced to 0.05%, and the 5th harmonic content can be reduced to 7.13%. In addition, the proposed method’s optimization effect on the torque pulsation is good. The torque ripple is reduced to about ±11 N·m, and the torque pulsation is reduced to about 0.63% in the case of the rated load torque of 1 600 N·m. (2) A bilateral modulation pulse generation method for open-winding systems is proposed, which is easy to implement digitally and can be used for online multi-vector synthesis. (3) Compared with the suppression method based on the harmonic current loop, the proposed method avoids the 3rd harmonic in terms of the inverter outputs and the selection of the voltage vectors. The method is more straightforward and does not require complex parameter tuning work for the PI or PIR controllers.
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Received: 24 November 2024
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2025, Vol. 40 
