变频器对换热站传感器信号干扰的原因分析及解决措施  

Cause Analysis and Solution of Frequency Converter's Interference to Sensor Signal of Heat Exchange Station

作　　者：林凯 季涛[2] 张雪原[2] 马云峰[2] LIN Kai;JI Tao;ZHANG Xue-yuan;MA Yun-feng(Qingdao University,Qingdao 266000,China;Weifang University,Weifang 261061,China)

机构地区：[1]青岛大学自动化学院,山东青岛266000 [2]潍坊学院,山东潍坊261061

出　　处：《潍坊学院学报》2019年第6期1-5,共5页Journal of Weifang University

摘　　要：针对变频器对于换热站自控系统中的传感器干扰问题,重点分析了变频器输入侧、输出侧高频干扰信号的产生机理,并结合干扰信号的特征提出了相应的抗干扰措施。首先,在变频器的输入侧设置交流电抗器,在传感器模拟信号的输出侧设置信号隔离器,在电源开关的输出侧设置隔离变压器,以消除变频器输入侧由整流环节产生的高频干扰信号;其次,将滤波磁环套在变频器的输出侧,用来过滤变频器输出侧由逆变环节产生的干扰信号;最后,结合系统抗干扰改进实例,提出了系统电气结构设计的总体思路,即控制柜与动力柜分离,强、弱电分离。经现场实践验证了上述抗干扰措施能够有效地消除变频器对传感器的干扰影响,有助于提高系统运行的稳定性。Aiming at the sensor interference problem of the invert in the automatic control system of the heat exchange station,the generation mechanism of the high-frequency interference signal on the input side and the output side of the invert is analyzed,and the corresponding anti-interference measures are proposed in combination with the characteristics of the interference signal.Firstly,an AC reactor is arranged on the input side of the invert,a signal isolation is arranged on the output side of the sensor analog signal,and an isolation transformer is arranged on the output side of the power switch to eliminate the high-frequency interference signal generated by the rectification link on the input side of the invert.Secondly,the filter magnetic ring is placed on the output side of the invert to filter the interference signal generated by the invert link on the output side of the invert.Finally,combined with the improved anti-interference system,the overall idea of the system electrical structure design is proposed.That is,the control cabinet is separated from the power cabinet,and the strong and weak electricity are separated.It has been verified by field practice that the above anti-interference measures can effectively eliminate the interference of the invert on the sensor and help to improve the stability of the system operation.

关 键 词：变频器 换热站 信号干扰 抗干扰措施 系统电气结构设计思路 

分 类 号：TN773[电子电信—电路与系统]