双Buck逆变器的双环滑模控制策略

Double-loop sliding mode control of dual-Buck inverter

针对传统电压电流双环控制下双Buck逆变器电压调整率和动态性能的问题,提出一种基于滑模控制的双环控制策略,其中电感电流参考量是输出电压误差经PI调节后得到的。选取电感电流误差、输出电压误差及其动态误差作为3个状态变量,以此建立滑模面函数,并对滑模控制器进行了设计。仿真和实验结果表明采用双环滑模控制的双Buck逆变器稳态精度高、谐波畸变率小、带负载能力强,相较于传统的双环控制,双环滑模控制具有更好的鲁棒性和动态性能。

Aiming at the problem of traditional double-loop voltage and current control tor dual-Nuck inverter in voltage regulation and dynamic performance,a strategy of double-loop sliding mode control is proposed. The reference of inductive current is the PI-regulated error of output voltage. The inductive current error,the output voltage error and its dynamic error are used as three state variables to establish the sliding mode surface function and the corresponding controller is designed. Simulative and experimental results show that,the dual-Buck inverter under the double-loop sliding mode control has higher precision, lower harmonic distortion and better load ability. Compared with the traditional double-loop control,the double-loop sliding mode control has better robustness and dynamic performance.