低压电网在1~30MHz频段的阻抗测量与特性分析

在对三种典型低压电网进行连续24小时测量的基础上,讨论了使用网络分析仪测量低压电网阻抗的方法,以及阻抗随频率、时间、地点变化的特点.分析结果表明在1～30MHz频段,其阻抗值在十几欧姆到上千欧姆之间变化,总体上随频率的升高而降低;在大于20MHz频段阻抗趋于一固定值;阻抗呈感性和容性交替变化;网络阻抗受负荷性质影响较大,且具有一定的时变性.

基于Internet和PLC的电能表数据采集系统的设计

以C8051F020单片机为核心,设计了一种利用Internet和低压电力网实现的电能表数据采集系统。介绍了系统结构和功能,阐述了Internet通信和电力网载波通信PLC的实现和软、硬件设计方案,给出了部分电路原理图和程序流程图。采用低压电力网作为数据集中器、终端采集器的传输通道和Internet通信技术,将数据集中器存储的电能数据上传到系统管理中心,实现了电能表的远程自动抄收和管理功能。该系统成本低、可靠性高、稳定性好,可有效提高电力系统管理的自动化程度。

Design and Implementation of Power Line Communication Module for Network Household Appliance

This paper presents the basic principle of OFDM technology and some key technologies, and do the simulation of OFDM technology. Secondly, on the basis of the design of intelligent Home Furnishing system demand, this paper research and design low voltage power line carrier communication based on Intelligent Home Furnishing system for. The circuit takes ARM Cortex-M3 based on the ARM kernel as the central controller, and realize remote monitoring and control of equipment through the transplantation of uC/OS-II system and the design of Web Serve program. Using OFDM power line carrier communication modes as networking mode of the intelligent Home Furnishing system. Finally, the paper realize the intelligent node and relevant software that constitute a complete system of intelligent Home Furnishing.