一种新型并联混合型有源滤波器的研究

摘要

In order to realize the functions of harmonic compensation and power factor continuous adjustment for nonlinear loads,a transformerless shunt hybrid active filter is proposed.In this paper,the main operational principle of the active filter is discussed firstly .To make a compromise in cost and filtering performance, we choose a passive filter tuned at seventh harmonic frequency,which makes a not good filtering performance in the mose domiant fifth frequency,a feedback and a fifth harmonic frequency feedforward control scheme is proposed. In order to compensate the system ractive power further,a certain improvement is made in the original feeback control links.The simulation results verify the efficiency of the shunt hybrid active filter.%为实现对非线性负载的谐波补偿和功率因数连续调节,采用了一种无变压器并联混合型有源滤波器,阐述了其工作原理.综合考虑成本与滤波效果的情况下选择采用7次单调谐无源滤波器,针对7次单调谐无源滤波嚣对于5次谐波补偿能力较差的状况,采用了反馈加5次前馈的控制策略.为了进一步对系统的无功功率进行补偿,在原有的反馈控制环节上进行了一定的改进.仿真结果证明了该并联混合性有源滤波工作的有效性.