用基于全通滤波器的IIR陷波器抑制工频通信中的谐波干扰  

REJECTING HARMONIC INTERFERENCE IN TWACS USING IIR NOTCH FILTER BASED ON ALL-PASS FILTER

作　　者：张世平[1] 赵永平[1] 刘瑞叶[1] 李德胜[1] 

机构地区：[1]哈尔滨工业大学电气工程学院,黑龙江哈尔滨150001

出　　处：《中国电机工程学报》2003年第5期35-38,61,共5页Proceedings of the CSEE

摘　　要：针对双向工频通信的信号特征,为了解决IIR陷波滤波器系数在低频段敏感度高的问题,提出采用基于全通滤波器的IIR陷波滤波器来消除电网谐波干扰的新方法。该陷波器可以由格型运算结构来实现,并因为全通滤波器的分子与分母之间的镜像对称关系,使滤波器在低频段具有非常低的系数敏感度。该文详细论述了该陷波滤波器的基本原理和设计方法,并通过一个设计实例说明了该方式由于量化效应引起的频率偏移量要远远小于级联方式。现场实验与仿真都证明了该滤波器能够非常有效地抑制电网中的基波和3、5次谐波,大大提高了对双向工频通信信号的检测能力。A novel method using an IIR notch filter to eliminate harmonic interference is proposed in terms of the signal character in TWACS. The notch filteris based on an all-pass filter and has a very low sensitivity at low frequenes due to the mirror-image symmetry relation between the numerator and denomimator palynomials of the all-pass filter. And the notch filter can be implemented by an efficitnt lattice structrue that gets the computation simple.The basic principle and design technique of the filter are discussed in detail.A design example indicates that the notch frequency shift caused by the quantization effect of this method is much less than that of cascade method.Practical experiment and simulation show that The 3rd,5th harmonic are suppressed effectively and the ability of detecting the signal of TWACS is improved greatly.

关 键 词：工频通信 谐波干扰 电网 电力系统 IIR陷波器 全通滤波器 

分 类 号：TM73[电气工程—电力系统及自动化] TN713[电子电信—电路与系统]