基于电流谐波优化的混合脉宽调制策略

doi:10.19595/j.cnki.1000-6753.tces.160284

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Abstract In traction driving system, asynchronous modulation and single pulse modulation are often used in low and high frequency regions, while in medium region, in order to improve the quality of the output waveform, optimal synchronous modulation is necessary. Current harmonic minimum PWM (CHMPWM) is one of the optimal synchronous modulation methods. Because of its excellent harmonic performance of output current, CHMPWM is considered in special. In this paper, a hybrid pulse width modulation strategy on the basis of current harmonic optimization is proposed, by considering the solution of CHMPWM angles and the influence of different angle distributions on its performance. A comparison between CHMPWM and SHEPWM is carried out by considering current harmonics and torque pulsation. By use of FPGA design, the hybrid PWM modulation strategy is implemented. As a result, a smooth transition between different modulation methods is achieved, and the harmonics features of motor current in medium and high frequency regions are improved. Simulation and experimental results confirm the effectiveness and validity of the proposed scheme.

Key words： Current harmonic minimum PWM low switching frequency digital implementation smooth transition

Received: 07 March 2016 Published: 30 October 2017

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TM46

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Cite this article:

Dong Kan. Hybrid Pulse Width Modulation Strategy Based on Current Harmonic Minimum Technique[J]. Transactions of China Electrotechnical Society, 2017, 32(20): 179-188.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.160284 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I20/179

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