一种具有低谐波阻抗的新型有源电力滤波器  

A Novel Active Power Filter with Low Harmonic Impedance

作　　者：曾伟 陈坤燚 赵国军 李沁 代灿 ZENG Wei;CHEN Kunyi;ZHAO Guojun;LI Qin;DAI Can(College of Intelligent Systems Science and Engineering,Hubei Minzu University,Enshi 445000,China)

机构地区：[1]湖北民族大学智能科学与工程学院,湖北恩施445000

出　　处：《湖北民族大学学报（自然科学版）》2022年第3期307-313,共7页Journal of Hubei Minzu University:Natural Science Edition

基　　金：湖北省教育厅科学技术研究计划指导性项目(B2019092)。

摘　　要：传统有源电力滤波器受电流检测精度影响严重,无法保证滤波效果.提出了一种具有低谐波阻抗的新型有源电力滤波器,该滤波器由并联于电网中的逆变器构成,利用逆变器接近于零谐波阻抗分流进行滤波.滤波逆变器采用跟踪公共连接点基波电压的方式进行控制,无需检测谐波电流,降低了控制难度,也不产生基波电流,节省了滤波器的设计容量.为保证滤波逆变器的稳定输出且具有低谐波阻抗,推导了等效谐波阻抗的表达式,分析了内外环控制器对等效谐波阻抗的影响,并确定了控制器参数.最后,在PSCAD/EMTDC中搭建了仿真模型.仿真结果表明,滤波后的系统侧电流总畸变率由24.14%降到了0.93%,电流波形基本为正弦波,达到了谐波抑制的国际标准.Seriously affected by the current detection accuracy,the traditional active power filter cannot guarantee the filtering effect.In this paper,a novel active power filter with low harmonic impedance is proposed.The filter is composed of inverters in parallel to the grid,and the inverter is used to filter near zero harmonic impedance shunt.The filter inverter is controlled by tracking the fundamental voltage of the common connection point and there is no need to detect the harmonic current,which reduces the control difficulty,produces no fundamental current and saves the design capacity of the filter.In order to ensure the stable output and low harmonic impedance of the filter inverter,the expression of the harmonic equivalent impedance is derived,the influence of the inner and outer loop controller on the harmonic equivalent impedance is analyzed,and the controller parameters are determined.Finally,a simulation model is built in PSCAD/EMTDC.The simulation results show that the total distortion rate of the system side current after filtering is reduced from^(2)4.14%to 0.93%,and the current waveform is basically sinusoidal,which fully meets the international standard of harmonic suppression.

关 键 词：有源电力滤波器 无谐波检测 低谐波阻抗 参数整定 

分 类 号：TM464[电气工程—电器]