新谐波分析法和CSI最优PWM模式研究及实现

New Method of Harmonic Analysis and Study on Optimal PWM Pattern for CSI and It' s Experimental Implementation

本文推导出电流源逆变器(CSI)脉宽调制(PWM)谐波电流幅值表达式,脉动转矩目标函数。根据此目标函数最小在IBM—PC机上进行脱线寻优、分谐波调制寻优;将脱线寻优结果与分谐波调制PWM优化法进行比较;也将脉动转矩最小PWM与效率最优PWM、谐波平均转矩最小PWM进行比较。采用硬件和软件相结合实现了脉动转矩最小的PWM发生器实验。它是一种简单、可靠、易于实现、价格低廉、性能良好的最优PWM发生器。

A formula of harmonic current amplitude for CSI PWM is derived in this paper. An objective function of pulsating torque is also derived. We proceed with off line optimized and subharmonic PWM optimized based on this objective function using IBM-PC microcomputer.The results of offline optimization are made to compare with subharmonic PWMoptimization, and the pulsating torque minimization PWM is also made to compare with efficiency optimization PWM and harmonic average torque minimization PWM.We made use of hardware in combination with software to realize the experiment of pulsating torque minimizat ion PWM generator.It is a simple, reliable, easier realization, lower price, and better characteristic PWM generator.