基波磁势自平衡谐波抵消式串联有源滤波器  

Series Active Power Filter Based on Fundamental Magnetic Potential Self-Balance and Harmonic Counteraction

作　　者：杨华云[1] 任士焱[1] 王晓蔚[1] 钟丹[1] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074

出　　处：《电工技术学报》2005年第5期45-48,57,共5页Transactions of China Electrotechnical Society

摘　　要：提出一种新型的基于基波磁势自平衡谐波抵消式串联有源电力滤波器。在变流器的二次侧接上一个LC基波串联谐振电路,便可使变流器对基波呈现低电抗,而对谐波呈现高阻抗。同时变流器检测绕组可直接检测出谐波电流波形,并通过变流器的谐波绕组反馈一个与一次侧谐波电流相位相反的电流去抵消系统中剩余的谐波电流。本文阐述了基波磁势自平衡谐波抵消式串联有源滤波器的结构和工作原理,分析了滤波器的谐波放大抑制原理,给出了滤波器的试验方法、结果及分析。试验结果表明此滤波器设计新颖、结构简单、可靠性高,并具有很好的滤波效果,电流畸变率由15.33%降为1.147%。A new type series active power filter based on fundamental magnetic potential self-balance and harmonic counteraction is proposed. It is found that if a LC fundamental series-connected resonance branch is connected in the second side of a current converter, the series current converter will present low reactance to fundamental and the high impedance to the harmonics. At the same time, the harmonic current waveform can be measured by the testing winding of the current converter. Thus if a harmonic current proportional and opposite to the phase of the harmonic current of the primary side is injected into the feedback winding, the surplus harmonic current of the power system can be counteracted. The theory of the harmonic magnification restraining is studied. Experiment results show that the design of the filter is novel and the filter possesses the simple structure and the perfect reliability. When the new type series active power filter is used, the current distortion factor in the testing power system is decreased from 15.33% to 1.147%.

关 键 词：磁势自平衡 有源滤波器 基波 有源电力滤波器 串联谐振电路 谐波电流 滤波器设计 变流器 电流波形 直接检测 谐波绕组 工作原理 抑制原理 谐波放大 试验方法 试验结果 滤波效果 二次侧 高阻抗 可靠性 畸变率 结构 电抗 

分 类 号：TM935.2[电气工程—电力电子与电力传动] TP212.1[自动化与计算机技术—检测技术与自动化装置]