A Novel Dual Random PWM Scheme and Its Simulation Analysis

doi:10.16182/j.issn1004731x.joss.201809028

Abstract

Abstract: In the consideration that random pulse position pulse width modulation (PWM) still contains discrete spectral components, a novel strategy of dual randomized modulation is presented. The proposed method is based on dual zero vector random pulse position PWM, in which zero vector is selected as V(1 1 1) when M≥0.7 and as V(0 0 0) when M<0.7, and the random variation of the pulse position and the switch frequencyis realized by increasing the switch frequency randomization. To insure better random variation degree of dual random PWM,WELL algorithm is introduced to generate random number. Simulation results show that the proposed scheme can reduce the dominant harmonic clusters of the output line voltages and the phase currents effectively, and has well-distributed spectrum in the whole frequency interval.

Key words: random PWM, switch frequency, WELL algorithm, harmonic suppression

CLC Number:

TM464

Wu Haopeng, Pan Tinglong, Wu Dinghui, Ji Zhicheng. A Novel Dual Random PWM Scheme and Its Simulation Analysis[J]. Journal of System Simulation, 2018, 30(9): 3451-3456.

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