低压电力线载波通信信道特性研究  

Research on characteristics of low voltage power line communication channel

作　　者：肖勇[1] 房莹[2] 张捷[1,3] 党三磊[1] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]华北电力大学,北京102206 [3]电子科技大学,四川成都611731

出　　处：《电力系统保护与控制》2012年第20期20-25,共6页Power System Protection and Control

基　　金：国家863高技术基金项目(2012AA050211)~~

摘　　要：低压电力线信道特性复杂,严重影响载波通信的质量。为了准确地了解低压电力线信道特性,根据测量数据对500kHz～30MHz频段下的低压电力线载波通信信道的阻抗特性、噪声特性和衰减特性进行分析。利用数理统计方法分析不同类型噪声,获得噪声特性参数并建立模型。依照自顶向下的信道建模技术建立了低压电力线多径衰落模型,根据负载线路的谐振特性对模型改进。仿真验证采用威布尔分布描述脉冲噪声频率分布特性是合理的,利用两种方法建立信道模型并与实测数据进行比较分析,结果表明改进后的模型能准确地反映低压电力线信道的特性并提高模型的精确性。The characteristics of low voltage power lines channel are very complicated, which seriously influence the quality of the power line carrier communication. In order to understand the characteristics of low voltage power lines, the carrier-current communication environment of low-voltage power line ranging from 500 kHz to 30 MHz is analyzed, including power line channel impedance, noise and attenuation characteristics. Different types of noise are analyzed with the mathematical statistic method and a noise model is built based on the characteristic parameters. The multipath fading channel model is presented based on the top-down channel modeling method and is improved according to the resonant characteristics of load circuit. The simulation shows that it is reasonable to use Weibull distribution for describing frequency distribution characteristics of pulse noise. Using two methods to establish channel models and comparing them with measured values, we found that the improved model can accurately reflect the characteristics of low voltage power lines channel and improve the accuracy.

关 键 词：低压电力线通信 噪声分析 信道特性 信道建模 

分 类 号：TM73[电气工程—电力系统及自动化]