Research on the inverter based on improved repetitive control combined with dual loop PI control

In order to solve the problems such as output voltage waveform distortion and power quality decline owing to inverter input DC voltage fluctuation,the bridge arm control deadtime and nonlinear loads etc,a mathematical model of PWM inverter was established,and a new inverter control scheme based on improved repetitive control method combined with dual-loop PI control method was presented.The dual-loop PI control method was used to improve the dynamic characteristics of the inverter and the improved repetitive control method was adapted to increase the steady state accuracy.The experiments related to the control scheme were done in the base of inverter unit of UPS power device controlled by STM32F103VB,the expermental results show that the inverter is of good characteristics,such as high steady accuracy and fast response and so on.