适用于大功率三电平中点钳位整流器的SVPWM和DPWM策略研究

doi:10.19595/j.cnki.1000-6753.tces.191599

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Abstract The high power three-level neutral point clamped (NPC) rectifier should reduce the switching frequency as much as possible while satisfying the harmonic current limit of the grid side, the neutral-point voltage balancing of the DC side and avoiding the phase voltage two-level jump (TLJ). Based on the above requirements, this paper firstly analyzes the basic principles of space vector pulse width modulation (SVPWM) and discontinuous PWM (DPWM), and then introduces four SVPWM switching sequences and eight DPWM switching sequences and compares their respective phase voltage waveforms. Aiming at the defects of TLJ and high switching frequency of traditional SVPWM, two improved SVPWM switching sequences are designed. And to solve the TLJ of DPWM, two improved DPWM switching sequences are proposed. On this basis, this paper studies SVPWM and DPWM from the aspects of TLJ, switching frequency, neutral-point voltage self-balancing ability, total harmonic distortion (THD) and harmonic current content, and summarizes three SVPWM switching sequences suitable for high power three-level NPC rectifier. Finally, a three-level NPC converter prototype is established, and the effectiveness of the designed improved switching sequences are verified by experiments.

Key words： Three-level neutral point clamped rectifier SVPWM DPWM two-level jump reduce switching frequency

Received: 22 November 2019

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TM461

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	Articles by authors
	Gao Zhan
	Li Yaohua
	Ge Qiongxuan
	Zhao Lu
	Zhang Bo

Cite this article:

Gao Zhan,Li Yaohua,Ge Qiongxuan等. Research on SVPWM and DPWM Strategies Suitable for High Power Three-Level Neutral Point Clamped Rectifier[J]. Transactions of China Electrotechnical Society, 2020, 35(23): 4864-4876.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191599 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I23/4864

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