中压模块化多电平换流器降低开关频率的锯齿载波最近电平-脉宽调制方法

doi:10.19595/j.cnki.1000-6753.tces.190182

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Abstract The nearest level pulse width modulation (NL-PWM) is suitable for the medium voltage modular multilevel converters (MMCs), which can greatly reduce the current distortion compared with the nearest level modulation (NLM). The NL-PWM achieves bridge-arm sub-module voltage balancing by the sorting algorithm. The implementation of the voltage-balancing rotating at each edge of the stair wave can reduce extra switching, but it also limits the balancing frequency and consequently affects the balancing effect. Since the switching frequency of PWM is relatively high, conducting the voltage-balancing rotating at the edges of PWM wave can greatly increase the balancing frequency. The state-of-the-art NL-PWM is based on triangle carrier, and its switching point varies with the reference voltage, which is not convenient for the implementation of the voltage-balancing control. In this paper, a non-frequency-doubling and a frequency-doubling NL-PWM methods based on sawtooth-carrier are proposed. The sawtooth wave has fixed edges to facilitate the voltage-balancing control. The hormonic characteristics of the proposed modulations are analyzed. It is shown that the frequency-doubling sawtooth-carrier based NL-PWM method can ensure both good voltage-balancing effect and output power quality while reducing the switching frequency. Besides, the proposed modulation can also avoid narrow pulse of power switches. Simulation and experiments verify the correctness of the theoretical analysis.

Key words： Medium voltage modular multilevel converter nearest level pulse width modulation (NL-PWM) sawtooth carrier switching frequency narrow pulse

Received: 23 February 2019 Published: 24 April 2020

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	Zhang Xueyin
	Xu Yonghai
	Li Weiguo
	Xiao Xiangning

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Zhang Xueyin,Xu Yonghai,Li Weiguo等. A Reduced-Switching Frequency NL-PWM Method Based on Sawtooth Carrier for Medium Voltage Modular Multilevel Converter[J]. Transactions of China Electrotechnical Society, 2020, 35(8): 1716-1727.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190182 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I8/1716

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