Selective Harmonic Elimination Pulse Width Modulation for High Power Three-Level Rectifier of High-Speed Maglev Traction System
Zhao Mutian1,2, Ge Qiongxuan1, Zhang Bo1, Fan Enze1,2, Zhu Jinquan1,2
1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China 2. University of Chinese Academy of Sciences Beijing 100049 China
Abstract：The traction power supply system of high-speed maglev train adopts high power back-to-back three-level active neutral point clamped (3L-ANPC) converter. In order to reduce the harmonics of grid-side current at low switching frequency, a selective harmonic elimination pulse width modulation (SHEPWM) strategy suitable for high power 3L-rectifiers was proposed based on linear extended state observer (LESO) and proportional resonance (PR) control in the three-phase static coordinate system. The corresponding dead time compensation method was also designed. During the operation of high-speed maglev train, the load on the inverter side would change sharply due to the changeover of the stator segment, resulting in a significant change in the grid-side current. Considering the poor dynamic performance of SHEPWM, an on-line correction method for the off-line calculated switching angle sequence in the changeover stage was proposed, which could improve the dynamic regulation ability of the rectifier closed-loop control based on SHEPWM. Finally, the back-to-back 3L-ANPC experimental platform was utilized to verify the superiority of SHEPWM in improving the grid-side current quality and the effectiveness of the proposed strategy to improve the dynamic performance of SHEPWM closed-loop control.
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2022, Vol. 37 
