低开关频率下SHEPWM和SVPWM同步调制策略比较研究

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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.

Key words： High-power traction drive system SVPWM SHEPWM synchronized modulation low switching frequency

Received: 10 September 2014 Published: 08 September 2015

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TM464

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	Articles by authors
	Wang Kun
	You Xiaojie
	Wang Chenchen
	Zhou Minglei

Cite this article:

Wang Kun,You Xiaojie,Wang Chenchen等. Research on the Comparison of Synchronized Modulation of SHEPWM and SVPWM Under Low Switching Frequency[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 333-341.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I14/333

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