一种新颖的矩阵变换器SPWM载波预调制控制策略

Novel control strategy of SPWM carrier wave premodulating for matrix converters

文章提出一种新颖的控制策略,利用输入线电压包络线对载波进行预调制,使载波在频率不变的情况下斜率随输入线电压包络线变化,进而修正SPWM的占空比,以抵消三相非对称输入及线电压包络线自身波动的影响;在此基础上建立了基于Matlab的仿真模型,仿真结果表明,该控制策略具有控制简单,动态响应快,输出电压波形THD较低等优点,并能较好地克服输入电压不对称造成的影响。

A novel control strategy for matrix converters is proposed. The envelope of the input line voltage is used to premodulate the carrier wave, making the slope of the carrier wave change as the envelope changes while the frequency is kept constant. The duty ratio of SPWM can be adjusted to compensate the influences caused by three-phase asymmetric inputs and fluctuation of the envelope itself. Matlab is utilized to build up a simulation model based on this control strategy. The simulation results indicate that the control strategy has advantages of simple control, fast dynamic response and low THD of the output voltage wave and can overcome the effects caused by asymmetric input voltage.