摘要
分析了电压空间矢量SVPWM的原理及合成任意位置电压空间矢量的算法,并在固定开关频率(载波频率)基础上提出开关频率随机变化的方法。固定频率的SVPWM脉冲信号的谐波主要集中在其开关频率附近,且幅值较大;随机开关频率SVPWM脉冲信号的谐波分布均匀,且其谐波幅值的峰值较前者有了很大下降。这有利于减小逆变器输出电压的谐波幅值,从而减小交流电机转矩脉动的大小,达到抑制噪音的目的。
The principle of the space vector pulse-width modulation （SVPWM） and the algorithm of synthesizing random space vectors are analyzed. The modulation method of random switching frequency based on stationary switching frequency is given. The harmonics of SVPWM based on stationary switching frequency are centralized nearby the switching frequency, and their amplitude is larger. The harmonics of SVPWM based on the random switching frequency distributing widely, and their amplitude are smaller. This is better to reduce the amplitude of the harmonics of the output of the converter, and then the torque ripples become smaller, the noises could be restrained.
出处
《船电技术》
2009年第3期25-28,共4页
Marine Electric & Electronic Engineering
