电流型PWM整流器叠流时间对网侧电流影响及其抑制方法

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Abstract To avoid large overvoltage when the current of the dc-link inductor is interrupted, overlap time is added to the drive signals in current source converters, which will bring the extra harmonics in grid current. Waveforms of AC side current before and after the added overlap time are achieved from the analysis of the current commutation process. The expression of overlap current is given. Moreover, according to the pulse equivalent principle, the quantitative relationship between the extra harmonic of AC side current and overlap time is also illustrated on the basis of Fourier analysis. In addition, a method of restraining the overlap current is proposed. Finally, simulation and experimental results demonstrate the effectiveness of the proposed analysis and restraining method.

Key words： Current source PWM rectifier overlap time grid current overlap current harmonics restraining method

Received: 14 December 2015 Published: 12 July 2016

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TM461

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I12/142

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