基于改进重复控制和双闭环PI控制的逆变器研究

摘要

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.%针对逆变器由于输入直流电压波动、桥臂控制死区和带非线性负载引起输出电压波形畸变,供电品质下降等问题,建立了PWM逆变器的数学模型,提出了一种基于改进重复控制和双闭环PI控制相结合的逆变器新型控制方案,采用改进重复控制方法提高逆变器的稳态精度,利用双闭环PI控制方法改善逆变器的动态特性。该方案在一套基于STM32F103VB控制系统的UPS电源装置逆变单元进行了相关实验,实验结果表明,设计的逆变器稳态精度高,动态响应快。