SPWM逆变器复合控制策略研究

Research on Multiple Control Strategy for SPWM Inverter

为了解决由于直流输入电压波动,带非线性负载和死区效应引起的单相逆变电源输出电压波形畸变率大,品质下降的问题。将迭代学习控制应用到逆变器波形控制中,提出了一种基于迭代学习控制和双闭环PI控制相结合的逆变器新型复合控制策略。运用极点配置对PI控制器参数进行设计。采用双闭环PI控制提高逆变器的动态特性,利用迭代学习控制改善逆变器的稳态精度。最后借助Matlab仿真软件进行仿真验证,仿真结果表明,该策略能获得具有良好的动态和稳态特性的波形。

In order to solve the problems such as output voltage waveform distortion and power quality decline owing to nonlinear loads and deadtime etc. , the iterative learning control is applied to control inverters and a new inverter control scheme is proposed based on iterative learning control by combining with double closed-loop PI control. Closed-loop PI controller parameters is obtained with pole assignment technique. Double closed-loop PI control is a- dapted to increase the dynamic characteristics of the inverter, and the iterative learning control is used to improve inverter steady-state accuracy. The simulation results show that the control strategy can achieve high-dynamic re- sponse and perfect output voltage waveform.