摘要
基于理论推导和分析,指出了在三相电压不对称时,应用瞬时无功功率理论检测谐波和基波正序有功及无功电流分量存在的问题。提出了一种准确检测这些电流分量的方法,即先构造出一个理想的基波对称系统,使该三相系统的电压等于原来非对称系统的基波正序电压,在此基础上进行谐波和无功电流的检测。对该检测方法进行了理论分析和仿真,仿真结果证明了在三相电压不对称时该检测方法仍然能正确地检测出谐波和基波有功、无功电流。
Based on mathematical deduction and analysis, the problems are pointed out that concern the detection of harmonics and fundamental positive-sequence active ＆ reactive current components with instantaneous reactive power theory under asymmetrical threephase voltages. A new precision method to detect these current components is presented and analyzed by mathematical deduction in this paper. In this new method, an ideal fundamental symmetrical system, of which voltages are equal to the fundamental positive - sequence voltages of the original system, is constructed first, then harmonics and corresponding current components can be detected accurately. Simulation results show that the proposed method can accurately detect harmonics, active current and reactive current of fundamental when three-phase voltage is unbalanced and distorted.
出处
《继电器》
CSCD
北大核心
2006年第18期47-51,共5页
Relay
关键词
瞬时无功功率理论
谐波
基波正序
无功电流
检测方法
instantaneous reactive power
harmonics
fundamental positive-sequence
reactive current
detection method
