低压宽带电力线通信系统建模仿真分析

Modeling and Simulation Analysis of Low-Voltage Broadband Power Line Communication System

低压电力线通信技术是实现电网自动集抄的关键技术之一,但电力线作为信号传输通道有着复杂的传输特性和外在噪声干扰。为具体分析电力线信道特性对系统性能的影响,建立基于电力线通信标准中常用的正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)调制技术的通信系统模型。系统采用传输线理论计算电力信道的传输函数,同时利用米特尔顿A类噪声模型模拟信道噪声。重点分析了不同的信道噪声、网络拓扑结构、支路负载等因素对信道衰减和系统误比特率的影响。仿真结果表明了通信系统对于信道因素变化的敏感性,为将来低压宽带电力线通信系统设计提供了理论分析基础。

Low voltage power line communication technology is one of the key technologies to perform automatic meter reading in the power grid system.However,as a energy transmission channel,the power line is not good for information transmission due to its complex transmission characteristics and external noise interference.In order to analyze the impact of power line channel characteristics on the performance of the communication system,a communication system model based on orthogonal frequency division multiplexing commonly used in power line communication standards is established.This system uses transmission line theory to calculate the transmission function of power channel,and uses Middleton A noise model to simulate channel noise.The impacts of different channel noise,network topology and branch load on channel attenuation and system bit error rate are systematically analyzed.The simulation results show that the communication system is sensitive to the change of channel characteristics,which provides a theoretical basis for the design of low-voltage broadband power line communication system.