可控电信号技术在低压电力线呼叫系统中的应用研究  

Research on a calling system based on controllable voltage signal technique

作　　者：雍静[1] 牛亮亮[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400030

出　　处：《电力系统保护与控制》2012年第21期67-73,共7页Power System Protection and Control

基　　金：中央高校基本科研业务费资助(CDJXS11150020);输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512709301)

摘　　要：提出一种全新而有效地将可控电信号技术实施在低压电力线上的呼叫系统方案。在需要发出呼叫请求的终端利用晶闸管对系统电源造成可控短路,从而通过电网电压波形的畸变来携带信息,在接收端对信息进行提取和识别,并在此基础上对请求端作出定位,以此来实现请求端对接收端的呼叫功能。通过理论、仿真和实验分析对方案的可行性进行了论证,得出信号强度和频率随系统及线路参数的变化特点,给出了晶闸管触发角最为合适的工作参数,对信号的检测算法进行分析,并得出可以对信号作出判别的有效判据。A new and effective calling system scheme which introduces the controllable voltage signal technique into low-voltage system is proposed. It makes a controllable short-circuit to power by thyristor at the terminal which needs to request a call. The call information is carried by the voltage waveform distortion. The information is identified and extracted at the receiver, the required end is located at the same time, then the call function is implemented. The feasibility of the proposed scheme is evaluated using analytical, simulation and field tests. The changing characteristics which system and line impedance are the main factors influencing signal strength and frequency are obtained. A suitable firing angle for the thyristor is given. The criterion of the signals detection is also obtained and verified by experiments in lab.

关 键 词：呼叫系统 可控电信号 电力线路 低压系统 

分 类 号：TM73[电气工程—电力系统及自动化]