一种非线性滤波器的设计  

Design on One Kind of Nonlinear Filter

作　　者：张舒铠 刘鑫屏[1] 

机构地区：[1]华北电力大学自动化系,河北保定071003

出　　处：《广东电力》2016年第5期11-14,41,共5页Guangdong Electric Power

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB215203)

摘　　要：工业现场中测量信号往往含有大量噪声,直接将这些测量信号引入到闭环控制系统中,可能导致执行机构产生不必要的动作。为此,设计一种包含高频通道和低频通道的非线性滤波器,在高频通道侧增加死区限幅非线性环节,可以实现对高频小幅干扰信号及大幅异常突变信号进行滤波,而对正常变化范围内的信号不进行滤波处理。用这种非线性滤波器分别对火电机组的炉膛压力、汽包水位、磨煤机电流等信号进行滤波处理,在不影响系统控制品质的前提下,能够有效减小执行机构异常动作的幅度和频率。Measuring signals at industrial scene often contain a great deal of noise.It may cause unnecessary action of implementing agencies if these measuring signals are introduced into the close-loop control system.Therefore,a kind of nonlinear filter containing high frequency channel and low frequency channel is designed which is able to realize filtering for high frequency small disturbance signals and large abnormal mutation signals by adding dead zone limiting nonlinear link at the side of high frequency channel while not to conduct filtering processing on signals in regular change range.It is able to effectively reduce amplitudes and frequencies of abnormal action of implementing agencies on the premise of not affecting system control quality by using this nonlinear filter to conduct filtering processing on furnace pressure,water level of steam drum,current of coal mill,and so on of the thermal power generating unit.

关 键 词：非线性滤波器 死区限幅非线性环节 速率限制非线性环节 信号滤波 

分 类 号：TN713[电子电信—电路与系统]