一种基于dqo变换改进的电流检测新方法  

A new method of current detection based on dqo-coordinate-transformation

作　　者：顾启民[1] 郑建勇[2] 尤鋆[2] 

机构地区：[1]常熟理工学院自动化系,江苏常熟215500 [2]东南大学电气工程系,江苏南京210096

出　　处：《电力系统保护与控制》2010年第23期21-25,共5页Power System Protection and Control

基　　金：苏州市科技发展计划资助项目(SG0839);江苏省高校自然科学研究计划项目(07KJD470004)

摘　　要：在传统dqo变换的基础上,提出一种改进型电流检测新方法。通过快速合成正序电压作为锁相环的基准参考,可以正确、实时地检测有功电流、无功电流,进而求出基波电流、负序电流和谐波电流,解决了三相电压不对称系统中实时提取基波正序分量求解复杂而困难的问题,并分析了电流检测动态跟踪情况。仿真研究表明:该方法灵活、简便,且具有良好的实时性,满足无功与谐波电流检测的要求,且可应用在三相三线制和三相四线制系统中。An improved new method of current detection based on traditional dqo-coordinate-transformation is presented, through which the positive sequence voltage, working as reference voltage of PLL, can be rapidly synthesized. On the basis of that, the active currents, reactive currents and harmonic currents can be obtained instantly, thus the complex and difficult problem of extracting the fundamental positive sequence voltage components from a unbalanced three-phase system in real-time can be solved. Then the dynamic track of current detection is analyzed. Simulation results show that the method is flexible, simple, and has a good real-time property. It meets the requirements of detecting reactive and harmonic currents, and can be applied in three-phase three-wire and three-phase four-wire system.

关 键 词：三相不对称系统 正序电压 快速合成 无功电流 谐波电流 

分 类 号：TM933.1[电气工程—电力电子与电力传动]