有源电力滤波器重复控制方法的改进研究

Study on the improvement of repeated control strategy for active power filter

变频器、整流器等各种非线性电力电子器在煤矿供电系统中广泛使用,导致电网谐波问题日益突出。在电力系统中安装有源电力滤波器等装置可以地抑制谐波进而改善电网电压电流畸变情况。由于煤矿系统电网有其自身独特的复杂情况,对有源电力滤波器的稳态性能和动态性能有很高的要求。为了兼顾有源电力滤波器的动态性和稳态性,针对有源电力滤波器控制部分采用改进重复控制和PI控制并联的方式增强补偿效果。在传统重复控制器中引入无差拍控制,利用无差拍控制的超前计算误差的特性提高重复控制器的响应精度,仿真结果验证了该方法的可行性。

The widespread use of converters,inverters and other nonlinear elements in mine power supply system leads to power harmonic problems becoming increasingly prominent. Active power filter can compensate various frequency harmonics effectively,also make grid electricity quality better.The specialty in power supply system asks high demand of the stability and dynamics of active power filter. To the above-mentioned question,this paper presented a method that uses improved repetitive control in parallel with PI control to enhance control effect.The accuracy of repetitive controller is implemented by introducing deadbeat control,which has specialty of advanced calculation.The simulation results verified the feasibility of this control strategy.