传输线电气参数测试方法研究与应用  

Research and application of testing method for electrical parameters of transmission lines

作　　者：谢志远[1] 王岩[1] 郭以贺[1] 刘倩[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《电力系统保护与控制》2012年第8期151-155,共5页Power System Protection and Control

摘　　要：为了研究电力线载波信道的衰减特性,需要建立高频传输线模型,而理论模型需要实测验证。基于传输线理论,通过理论计算,得出一具体长度的传输线在不同频率的电气参数值,并与实际模型测试值进行比较,验证了理论计算的准确性。此外,为进一步模拟实际电力线网络,提出了基于网络级联思想的信道建模方法,即将一段均匀电力线视为一个二端口网络,整条线路可以用多个二端口网络的级联表示。通过对实际线路模拟模型的测量,验证了该思想的正确性,为配电网电力线电气参数研究提供了理论基础。In order to analyze the attenuation characteristics of the PLC charmel, it is necessary to establish a high frequency transmission line model, which needs to be verified by actual measured data. Based on the transmission line theory, the electrical parameters of a transmission line with certain length at different frequency are obtained through theoretical calculation. Compared with the test value of the practical model, the accuracy of theoretical calculation is verified. Besides, so as to simulate the practical power line network, a channel modeling method based on network cascading is proposed. In this method a length of uniform power line is regarded as one two-port networks and the whole power line can be represented by a cascading of multi two-port networks. Through the measurement of simulation model of practical line, the validity of the cascading thought is confirmed. The model provides a theoretical basis for the study of the electrical parameters in distribution network.

关 键 词：电气参数 衰减 传输线模型 二端口网络 级联 

分 类 号：TM73[电气工程—电力系统及自动化]