无锁相环单相任意次谐波电流实时检测方法  

Real Time PLL-less Detection Method for Single-Phase Random Harmonic Current

作　　者：周福林[1] 李群湛[1] 郭成[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《西南交通大学学报》2009年第3期360-364,共5页Journal of Southwest Jiaotong University

基　　金：国家科技支撑计划重点课题资助项目(2007BAA12B05);铁道部重大课题资助项目(Z2006-04F)

摘　　要：提出了无锁相环单相任意次谐波电流实时检测方法.将谐波电流变换成低频信号,用转换矩阵代替常规谐波电流检测方法中的锁相环,用积分均值法代替低通滤波器提取低频信号,对低频信号再通过函数逆变换,检出谐波电流,分析了该方法的检测误差.仿真实验表明,提出的检测方法不受直流偏移影响,能自动跟踪系统频率,与采用低通滤波器提取低频信号的谐波检测方法相比,提高了检测精度和动态响应速度.A real time PLL-less detection method for single phase random harmonic current was proposed. In the method, harmonic current is transformed to low frequency signals by a transform matrix instead of a phase lock loop （PLL） used in traditional harmonic current detection method, and the low frequency signals are extracted with the integral mean value method instead of low pass filter （LPF）, tarmonic current is obtained through inverse transformation of the low frequency signals, he errors of the proposed method were analyzed. Simulation shows that the proposed method is not affected by DC bias, can reflect system frequency shift, and has better performances in terms of dynamic response and accuracy than the one that uses an LPF to extract low frequency signals.

关 键 词：单相系统 谐波检测 积分均值 锁相环 

分 类 号：TM761[电气工程—电力系统及自动化]