电力载波通信抄表集中器硬件设计

1、电力载波通信抄表集中器硬件设计毕业论文题目：电力载波通信抄表集中器硬件设计专业：电气工程及其口动化姓名：于洋指导老师：陈兴II摘要随着我国电力事业的迅速发展，传统的用电抄收管理方式己经不能满足市场需求。本 文在大量收集查阅国内外有关远程抄表系统资料、深入用户及用电管理部门广泛调研的基 础上，提出了一种采用低圧电力线载波通信技术的远程口动抄表系统。该系统具有三层网 络结构，即上位机管理系统、集中器和載波电表。重点分析研究了集中器及其与各组成部 分的通信。由丁-我国低压电力线上存在的高削减、高噪声、高变形，必须采用特殊的通信 技术。本文首先分析了高频信号在电力线中的传输特性；重点讨论了扩频通信技术

2、在电力线 载波通信中的应用；深入研究了以扩频调制解调技术通信技术为基础的、高性能的电力线 载波专用MODEM芯片SSC P300的内部工作原理。在此基础上，采用SSC P300实现了远程 抄表系统中集中器与终端载;波电表之间可靠的数据传输。集中器是连接上位机与终端载波 电表之间的枢纽，起着上传下达的作用。根据中华人民共和国电力行业标准规定的集中器 的主要功能及性能指标要求，本文重点研究设计了集中器的硬件系统。其中硕件系统主要 包括主控制器、外部扩展数据存储器、时钟模块、上位机通信接口电路以及电力线载波通 信电路及其外围电路等。关键词：电力线载波，扩频通信技术，集中器，抄表系统IllABSTRA

3、CTWith the rapid development of power undertaking of our country, the traditional ways of meter reading can not satisfy the demand of market any more Based on the vast collecting and consulting of the concerned information of the remote meter reading system of the home and abroad and going deep into

4、 the consumers and power consumption administrative departments to investigate and research widely, a remote meter reading system adopting carrier communication technology of the lovoltage power line communication (PLC) had been proposed in this paper It had network structure of three layers ie. the

5、 computer administrative system, concentrator and carrier meter And the functions and characteristics of the whole system together with its every component had been analyzed Because high attenuation high noise and high distortion exist in the lowvo It age power lines of our country , special communi

6、cation technology must be adoptedFirst of all, the transmission characteristic when high-frequency signal was transmitted through power lines was analyzed Secondly, the application of spread spectrum communication technology to carrier communication of the power line was emphatically discussed Third

7、ly the interior principle of the special MODEM IC SSC P300 adopting Spreadspectrum modem communication technology was deeply studied Based on this, SSC P300 was selected to thereliable data transmission between the concentrator of the long-distance meterreading system and the terminalsignal carrier

8、ammeter.Being the heart of theautomatic meter reading system,the concentrator connected the computer withthe terminal carrier meter.The hardware system of the concentrator wasemphatically designed accordingto the main functions and the demands forperformance targets of the concentrator stated in the

9、 power trade standard ofPRC It was mainly composed of MCU external expanded RAW clock module,watchdog module the computer communication interface circuit and the PLCcommunication circuit together with its peripheral circuits KEYWORDS： carrier power line, spread spectrum communication technology,conc

10、entrator,meter reading systemIll摘要ABSTRACT 1绪论1 1.1电力线载波通信的意义及发展状况 1.2低压电力线通信的特点国内外硏究现状和动态 计电力載波抄表集中器的目的和意义 的可行性分析主要任务通信技术通信中信号传输特性分析8电力线载波通信技术13术工作原理4现用Modem芯片计成硬件设计统集中器的硬件设计标8图块11 1. 3 2 1.4 设 2 1.5课题 3 1.6本文的 3 2电力线载波 4 2. 1电力线载波 4 2. 2常用的低压 5 2.3扩频通信技 6 2. 3.1扩频通信的 6 2. 3.2扩频通信的特点 6 2. 4电力线载波通信的

11、实 .7 2. 4.1国外的电力线载波专7 3电力载波抄表系统总体设.8 3. 1自动抄表系统的组 8 4电力载波抄表集中器的 .10 4.1电力线载波远程抄表系 .10 4.1.1集中器的功能及技术指 10 4. 1.2集中器的结构框.11 4.2时钟模12IV TOC o 1-5 h z 4. 2. 1设计思想124. 2.2时钟模块的选择15 124. 2.3时钟模块与单片机的连接14 134. 3电力线载波通信电路设计134. 3. 1载波通信芯片SSCP300的发送与接收原理154.3.2单片机与SSCP300通信的控制工作过程17 4. 4主控器与 MODEM 通信接口 19 4.4. 1 MODEM简介194. 4. 2主控器与MODEM通信接口电路 204. 5电源电路21 5电力线载波抄表系统集