电力载波通信抄表集中器硬件设计毕业论文.doc

电力载波通信抄表集中器硬件设计 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，提出了一种采用低压电力线载波通信技术的远程自动抄表系统。该系统具有三层网络结构，即上位机管理系统、集中器和载波电表。重点分析研究了集中器及其与各组成部分的通信。由于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ardware Design of Power Line Communication Meter Reading Concentrator ABSTRACT With 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 the consumers and power consumption administrative departments to investigate and research widely, a remote meter reading system adopting carrier communication technology of the low-voltage power line communication (PLC) had been proposed in this paper. It had network structure of three layers，i.e. the 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 low-voltage power lines of our country ,special communication technology must be adopted. First 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. Thirdly，the interior principle of the special MODEM IC SSC P300 adopting Spread-spectrum modem communication technology was deeply studied. Based on this，SSC P300 was selected to the reliable data transmission between the concentrator of the long-distance meter reading system and the terminal signal carrier ammeter. Being the heart of the automatic meter reading system，the concentrator connected the computer with the terminal carrier mete