低压电力线载波集中抄表系统的研究

Research on automatic meter reading system for low-voltage customers

详细介绍了低压电力线远程抄表系统各组成部分的原理与软、硬件实现。该系统采用过零点扩频通信方案大大提高了通信成功率,使用主动式看门狗电路提高系统的电磁兼容性。集中器在硬件结构上采用3种存储技术,提高了用户电量数据的可靠性。低压电力线通信信道具有信号衰减大、噪声高、信号传输具有时变性和频变性的特点,运用自动中继技术可使抄到率达到100%。集中器与管理中心采取GPRS通信方式,具有连接方便可靠的优点。系统实际运行情况良好。

This paper details the principle of each element and realization of automatic meter reading system through low-voltage power line. The proposed system can improve which improving the reliability of COnlmunication by zero-crossing spread spectrum technology and active watchdog technology. Three adopted kinds of memory technologies enhances the reliability of power data for every household. 100 percent reliable connection is achieved by automatic routing technology against heavy attenuation, noise and variable transfer characteristic with frequency and time. The channel between master station and concentrator is through GPRS, which offers broad coverage. This system operates well in real environment.