摘要
针对LCL滤波的并联型有源电力滤波器(APF)与并联电容器联合补偿时存在谐振的问题,首先讨论了补偿电流检测点的选择问题,证明了负载电流不包含容性电流成分时系统稳定性较好,但在工程实际中负载电流必然包括容性成分。采用了一种虚拟阻尼控制策略,通过对滤波器电容电压的谐振分量进行反馈控制,在补偿谐波的同时抑制谐振。仿真与实验结果证明了该方法的有效性。
A hybrid system with shunt capacitor and LCL filter shunt active power filter（APF） compensating harmon- ics is presence of resonance problem.Firstly,the choice of two common methods to detect the load current and the compensation current is analyzed（with or without capacitive load current）.The result shows the hybrid system is stable when the capacitor current is not included in the detected load current.However,in the actual project almost unlikely to detect load current independently without capacitive current.Then based on capacitor voltage feedback the virtual resistor paralleled capacitor control strategy is proposed.The strategy could compensate the harmonics and suppress the resonance.The simulation and experimental results prove the reliability of the method.
出处
《电力电子技术》
CSCD
北大核心
2014年第3期42-44,共3页
Power Electronics
关键词
滤波器
虚拟阻尼
电容电压反馈
filter
virtual resistor
capacitor voltage feedback
