相较于传统的脉宽调制技术，随机脉宽调制具备有效的谐波频谱分散能力，从而实现机电负载噪声的削弱。随机脉宽调制技术包括起步的随机开关调制、后续的随机脉冲位置与随机开关频率等3个基本方法。随着电力电子技术的整体发展，随机脉宽调制已从传统的载波调制逐渐拓展到空间矢量调制之中，应用范围日趋广泛，谐波频谱分散与功率谱峰值抑制的效果不断提升。同时，新的优化方案不断被提出，对谐波频谱及功率谱的分散效果亦在不断提高。梳理了随机脉宽调制的研究历程，总结了数种典型的随机脉宽调制的基本原理，并对未来随机脉宽调制的研究方向作出展望，为随机脉宽调制技术的深入研究提供参考。

Compared with the conventional pulse width modulation (PWM) technology, random PWM (RPWM) has effective ability of harmonic spectrum dispersion, which can reduce the noise of electromechanical load. The RPWM technology includes three basic methods: initial random switch modulation, and subsequent random pulse position and random switching frequency modulation. With the overall development of power electronics technology, RPWM has been gradually expanded from conventional carrier modulation to space vector modulation, the application prospect is increasingly broad, and the effect of power spectrum peak suppression is continuously improved. At the same time, new optimization schemes are put forward constantly, and the dispersion effect of harmonic and power spectrum is also continuously improved. The research history of RPWM is reviewed, the basic principles of some typical RPWM technologies are introduced, and the future research directions of random PWM are prospected, so as to provide a reference for further research of RPWM technology.

国家自然科学基金项目(51807199，52077219，52007196)