SPWM逆变电源数字重复控制的改进方案

Improvement of Digital SPWM Inverter Based on Repetitive Control

提出了一种改进的重复控制单相逆变器的控制方案,即在电压内环的前向通道中将无差拍控制器串联于重复控制器之后,并在DSP平台上采用数字控制算法实现该控制方案.系统处于稳定运行状态时,重复控制可增强系统抗周期性干扰能力,改善系统稳态特性;负载出现大的扰动时,无差拍控制器可感受到输入误差的突变并立即产生调节作用,保证系统有较快的响应速度.实验结果表明该控制方案能获得良好的动、稳态性能.

An improved repetitive control scheme in single-phase inverter is adopted, namely connecting the deadbeat controller after repetitive controller in the forward channel of the inner voltage ring, and using digital control algorithm in the DSP platform to achieve the control scheme. When the system is in stable operation condition, repetitive control is used to resist periodic disturbance and thus improve the steady-state performance. Contrarily, the deadbeat controller can feel mutation of input error and produce accommodation immediately to ensure the system＇ s fast response speed. Experiment results prove that the proposed scheme can achieve good dynamic and steady-state performance.