Abstract：In high-power traction drive systems, owing to the limit on switching losses and cooling conditions, the maximum value of switching frequency cannot be very high. Under such circumstances, we usually adopt synchronized modulation strategies in high speed region. This paper analyzed the basic principles of synchronized modulation of SHEPWM and SVPWM under low switching frequency, presented the computational method of SHEPWM switching angles and also introduced five SVPWM synchronized modulation strategies satisfying half-wave, quarter-wave and three-phase symmetries. In order to compare overall performances of SHEPWM and SVPWM, this paper analyzed the two synchronized modulations in aspects of flux trajectories, harmonic distribution and WTHD of line voltage and digital realization based on DSP. The results show that when carrier ratio is higher than 7, the output performance of SHEPWM is better than SVPWM. However, SVPWM has more advantage in digital realization based on DSP.
王堃,游小杰,王琛琛,周明磊. 低开关频率下SHEPWM和SVPWM同步调制策略比较研究[J]. 电工技术学报, 2015, 30(14): 333-341.
Wang Kun,You Xiaojie,Wang Chenchen,Zhou Minglei. Research on the Comparison of Synchronized Modulation of SHEPWM and SVPWM Under Low Switching Frequency. Transactions of China Electrotechnical Society, 2015, 30(14): 333-341.
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2015, Vol. 30 
