基于ip-iq方法的畸变电流检测及其实现  

Detection of Distorted Current Based on i_p-i_q Method and Its Physical Realization

作　　者：孟珺遐[1] 周子冠[2] 李光辉[1] 李再华[1] 白晓民[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]国网电力科学研究院,北京市昌平区102200

出　　处：《电网技术》2012年第5期125-131,共7页Power System Technology

基　　金：国家高技术研究发展计划(863计划)(2011AA05A301)~~

摘　　要：研究了基于ip-iq方法提取畸变电流的物理实现过程。设计并制作电网电压信号调理和整形电路、锁相频率合成电路,按照采样点数要求产生无相位差的同步采样信号,利用高精度的A/D转换电路完成负载电流信号的采集,保证了采样精度。ip-iq算法中数字低通滤波器的类型、动静指标等对检测精度的影响较大,给出了给定滤波指标后设计满足要求的数字低通滤波器的方法。在Matlab中对设计的ip-iq算法进行仿真分析,结果表明畸变电流的补偿效果明显,所述方法能够应用在有源电力滤波器的研制中。A large number of non-linear loads deteriorate power quality and grid-connection of new energy sources such as wind farms and photovoltaic generation aggravates harmonic pollution in power grids. Various compensation and filtering devices are used to solve problems related to power quality. Based on ip-iq detection, the physical implementation of extracting distorted currents is researched. A grid voltage signal conditioning and shaping circuit and a PLL frequency synthesizing circuit are designed and made; according to the requirement to the number of sampling points and using the designed circuits the synchronous sampling pulses without phase error can be generated and by useot lalgla-preclslon A/l） converter the acquisition oI loaO current signals is implemented and the accuracy of the sampling is ensured. Type of digital low-pass filter used in ip-iq algorithm as well as its dynamic and static indices greatly affect detection accuracy, so after the determination of dynamic and static indices of digital low-pass filter a method to design such a filter that can meet the demand of these indices is given. A Matlab based simulation on the designed ip-iq algorithm is performed, and simulation results show that the effect of compensating distorted current is obvious and the proposed method can be applied to the development of active power filter.

关 键 词：畸变电流 ip-iq检测 低通滤波器 锁相频率合成 

分 类 号：TM714[电气工程—电力系统及自动化]