基于改进p-q-r法的三相四线制系统谐波电流检测方法的研究  

Research on Harmonic Current Detection in Three-Phase Four-Wire System Based on Improved p-q-r Method

作　　者：周虎[1] 潘迪夫[1] 

机构地区：[1]中南大学交通运输工程学院,湖南长沙410075

出　　处：《低压电器》2009年第8期46-50,共5页Low Voltage Apparatus

摘　　要：针对传统p-q-r理论不适用于三相电压发生畸变或不平衡等情况的缺陷,提出了改进的p-q-r法。该方法采用三相单位对称正弦信号代替三相电压。通过理论分析及仿真,证明改进的p-q-r法算法清晰,没有增加电路复杂性,且不需要锁相环,在三相电压发生畸变或不对称时,能够实时检测谐波电流及基波负序、零序电流。Aiming at the defect that traditional p-q-r theory could not be applied when three-phase voltages were distorted or unbalanced, an improved p-q-r method was introduced. This method used three-phase unit symmetrieal-sinusoidal signals instead of three-phase voltages. Theory analysis and simulation proved that the improved p-q-r method had a clear algorithm, and did not increase the circuit complexity and didn＇ t need phase-lockedloops. When three-phase voltages were distorted or unbalanced, the improved p-q-r method could online detect harmonic and fundamental reverse-sequence and zero-sequence currents.

关 键 词：三相四线制 谐波电流 p-q-r法 中线电流 有源滤波器 

分 类 号：TN761[电子电信—电路与系统]