同步参考坐标法和正、负序基波提取器在电流检测中的比较  

Contrastive research on improved synchronous reference frame method and detecting method based on sequence extractor of positive and negative fundamental wave for detecting current

作　　者：周君求[1] 陈兰玉[2] 周沛锋[2] 王少杰[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]邵阳学院电气工程系,湖南邵阳422000

出　　处：《中南大学学报（自然科学版）》2008年第4期816-823,共8页Journal of Central South University:Science and Technology

基　　金：湖南省科技计划资助项目(2006GK3057)

摘　　要：简述正、负序基波提取器基本原理,提出无功、谐波和负序电流检测的2种方法,即改进同步参考坐标法和基于正、负序基波提取器的检测方法。改进同步参考坐标法通过对电网正序基波电压矢量的同步旋转跟踪,可以省去锁相环及三角函数的计算;基于正、负序基波提取器的检测方法则可以进一步省去α-β坐标系变换到d-q坐标系及其反变换的计算。仿真与实验结果表明:采用这2种检测算法都能准确地检测电网中的无功、谐波和负序电流;基于正序基波提取器的检测算法比改进同步参考坐标法的实时性更高。Sequence extractors of positive and negative fundamental wave were discussed, and two types of methods for detecting current with reactive power, harmonics and negative sequence were proposed, which are the improved synchronous reference frame method and the detecting method based on sequence extractor of positive and negative fundamental wave. By synchronizing the grid voltage vector with positive sequence, the improved synchronous reference frame method is very simple without the phase locked loop and calculations for sinusoidal function. And the detecting method based on sequence extractor of positive and negative fundamental wave can furtherly omit the transformation from the α-β coordinate to the d-q coordinate and its inverse transformation. Simulation and experimental results show that the two methods are valid and useful.

关 键 词：电能质量 电流检测 同步参考坐标变换 相序提取器 

分 类 号：TM761[电气工程—电力系统及自动化]