滑模PI控制在APF直流侧电压控制中的应用

Sliding Mode PI Control of DC-link Voltage Control for APF

直流侧电压的控制性能会直接影响并联有源电力滤波器(APF)的补偿特性,对直流侧的电压控制成为研究APF的关键技术之一。采用传统比例积分(PI)控制系统难以保证并联APF在负载突变和参考电压跳变时对直流侧电压快速精准控制,针对上述问题,提出了电压外环滑模PI复合控制算法。通过对直流侧电压在PI控制算法和滑模PI复合控制方法下的仿真和实验对比分析,结果表明,滑模PI复合控制器提高了直流侧电压的稳态性能和响应速度,同时有效减小电压波动,基于该控制算法的并联APF控制系统具有良好的鲁棒性能和动态性能。

The performances of the shunt active power fiher（APF） are mainly affected by the DC-link voltage control, and the research of the DE-link voltage control becomes one of the key technologies in the APF system.Due to the bad performance of the output DE-link voltage based on the traditional proportional integral （PI） controller, especially, under the load step-change and the reference voltage jump change, an effective voltage loop sliding mode control based PI hybrid control method to solve the above problems is presented.The output performances of the PI control algorithm and the sliding mode control based on PI control method are analyzed, the simulation and experimental results show that the sliding mode control based on PI scheme can improve the steady-state performance and transient response, and the shunt APF based on this scheme has better robust and dynamic performance.