一种基于混合数字滤波器的过零检测技术  

Zero-Crossing Detecting Technique Based on Hybrid Digital Filter

作　　者：彭国富[1] 周洪[1] 但伟[1] 夏明晔[1] 余力[1] 

机构地区：[1]武汉大学动力与机械学院自动化系,湖北武汉430072

出　　处：《微计算机信息》2008年第10期274-276,共3页Control & Automation

摘　　要：传统过零检测技术主要存在不能消除谐波、电压切痕,脉冲等噪音造成的虚假过零现象,给系统引入迟延、相移,并对电力系统频率变化敏感等弱点。根据预测FIR滤波理论,中值滤波技术,提出了在数字信号处理器(DSP)上实现基于混合数字滤波器的过零检测方法,能够消除虚假过零,补偿延迟和相移,对电力系统频率±0.2Hz变化鲁棒性强,并提出了确定预测FIR滤波器阶数的一般方法。最后仿真实验证明了方法的先进性。Traditional zero-crossing methods have following weak points: can not diminish false zero- crossing caused by harmonics, notch etc., phase shift and delay added in, sensitive to variation of power system frequency. A method, implemented on digital signal processor (DSP), based on hybrid digital filter that consists of median filter and predictive finite impulse response (FIR) filter, for ze- ro- crossing detection is introduced, which can overcome weak points of traditional zero- crossing detecting techniqu...

关 键 词：过零检测 混合数字滤波 预测FIR滤波 中值滤波 补偿延时 鲁棒性 

分 类 号：TN713.7[电子电信—电路与系统]