并联型有源电力滤波器新型谐波检测方法研究

Study on New Harmonic Detection of Shunt Active Filter

由于分布式电网中的非线性、不平衡负载和无功负载的增加,造成了谐波电流、负载不平衡电流、中性线电流和低功率因数等影响电能质量的问题,通常使用并联型有源电力滤波器来实现谐波消除、无功补偿、负载不平衡电流和中性线电流消除。在有源电力滤波器的谐波检测方面,分析了传统基于瞬时无功功率理论方法的不足,提出了新的谐波检测方法,采用滑动平均滤波器(moving average filter,MAF)代替低通滤波器(low pass filter,LPF)进行直流分量的提取,克服了低通滤波器导致的传统检测方法实时性和动态性不强的缺陷,同时简化了模型结构。搭建了仿真与实验平台,仿真与实验结果表明新的谐波检测方法具有良好的检测效果和优越性。

Such issues affecting power quality as harmonic current, load unbalance current, neutral current and low power factor etc are caused due to the increase of non-linear,unbalance load and reactive load in the distribution power grid,the shunt active power filter is normally used to achieve elimination of harmonic, reactive power compensation load unbalance current and neutral current. In the field of harmonic detection of active power filter,the shortcoming of the traditional theoretical method based on transient reactive power is analyzed,new harmonic detection method is proposed and the moving average filter（MAF） is used to replace low pass filter（LPF）for the extraction of DC component,which overcomes such defects as weak real time and dynamic of traditional detection method due to the low pass filter and,at the same time,simplifies model structure. The simulation and experimental platform is set up. It is shown by the simulation and experimental result that the new detection method has perfect detection result and superiority.