UPS逆变器的渐近收敛无差拍控制

传统无差拍控制应用于UPS逆变器,存在对系统参数变化的鲁棒性问题.本文提出了一种新的控制方案-渐近收敛无差拍控制.该方案与传统无差拍控制的区别是,不是将正弦信号作为参考电压,而是采用当前的输出电压和正弦信号的加权平均作为下一控制周期的目标量.基于DSP搭建了1kVA/700W的实验样机.理论分析和实验结果表明,渐近收敛无差拍控制有良好的稳态性能和快速的动态响应,对系统参数的变化有较好的鲁棒性.

Progressively converging deadbeat control for UPS inverter

The traditional deadbeat control for UPS inverters has a robustness problem.The parameter imprecision greatly harms the stability of the system.A novel deadbeat control method-the progressively converging deadbeat control-is proposed in this paper to deal with the problem.In the traditional deadbeat control method the sinusoidal signal serves as the voltage reference,while in the novel control method the weighted average of the sinusoidal reference signal and the current output voltage signal is chosen as the target value of the next sampling instant.The weighing value can be adjusted according to the systematic performance.A 1kVA prototype was built based on DSP.Theoretical analysis and experimental results show that the progressively converging deadbeat control has small static error and fast dynamic response.Further analysis proves that the robustness for parameter variation is better than the traditional deadbeat control.This method is an improvement of the traditional deadbeat control.