改进的无锁相环无低通滤波器的谐波检测方法  

Improved Harmonic Detection Method without PLL and LPF

作　　者：周晴[1] 毛亚辉[1] 赵永彬[1] 

机构地区：[1]国电南京自动化股份有限公司,南京210003

出　　处：《电测与仪表》2012年第2期27-31,36,共6页Electrical Measurement & Instrumentation

摘　　要：谐波检测精度和实时性直接影响APF的补偿性能。本文在传统d-q谐波电流检测算法基础上进行了改进,针对锁相环易受电网波动影响的缺陷,采用基于正序基波提取器的d-q检测方法;针对低通滤波器滤波效果与响应速度难以兼顾的问题,采用基于直流分量的d-q检测方法;结合以上两种方法的优点,得出一种无锁相环无低通滤波器的d-q检测方法。仿真和实验结果表明,改进的d-q法能较准确地检测出补偿电流信号,且动态响应快,算法实现简单。Harmonic detection accuracy and real-time directly affect the performance of the APF compensation. This paper carried out improvement based on traditional d-q harmonic current detection algorithm, used the d-q method based on positive sequence fundamental extractor for the problem of the phase-locked loop （PLL）; used the d-q method based on the DC component for the low-pass filter （LPF） problem. Thus combining these two methods＇ advantages, it proposed d-q method without PLL and LPF. Simulation and experimentation show that the improved d-q method can precise detect the compensation current signal.

关 键 词：d-q法 基波提取器 直流分量法 

分 类 号：TM933[电气工程—电力电子与电力传动]