单相逆变器的滑模自适应控制器设计

Sliding Model Adaptive Controller Design of Single-phase Inverter

针对负载频繁变化造成逆变器波形输出严重失真的问题,基于滑模自适应控制策略,设计了单相逆变器的滑模自适应控制器。首先,建立带负载参数的逆变器数学模型,利用逆变器输出与参考信号的偏差量设计滑模面;然后将负载看作时变的参数,这样负载就成为系统的不确定部分。通过设计滑模自适应控制律,逼近不确定部分的上界,对不确定部分实现完全补偿。仿真结果表明,滑模自适应控制器在负载变化时,能够很好地跟踪系统的正弦输入,使系统有很强的鲁棒性。最后设计了实验样机,证明了控制策略的可实现性。

The sliding model adaptive controller was designed to solve the problems which the load changing frequently caused output waveform distortion. Firstly, mathematical model of inverter was built with load parameter. The sliding model surface was designed based on errors between inverter outputs and reference singal.Then the load was seen as time-varying parameters, so the parameter of load would be the uncertainties of system. In order to compensate the uncertainties completely caused by load changing frequently and estimate boundary accurately, sliding model adaptive control law was designed. The simulation experiments show that, when load changing, the controller will track sine input of system accurately, which improves the robustness of inverter system significantly. Finally, an experimental prototype is designed to show realization of the sliding model control method.