Progressively converging deadbeat control for UPS inverter

Abstract

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.