基于载波和工频混合组网技术的集中抄表系统

An Automatic Meter Reading System Based on Integrated Carrier and Power Frequency Technology

低压电力线载波信道的衰减、干扰以及随机时变性使得载波通信方式无法满足集中抄表系统全采集、全覆盖的建设要求。工频通信也是通过电力线传输信号,并使用50Hz工频信号作为载波,与3~500kHz的载波通信频率范围互不冲突。本文利用工频通信传输距离远、可靠性高、成本低廉的特点,在不增加额外设备的条件下,实现了载波与工频两种通信方式的混合组网。针对所给出的组网方案,详细论述了集中器和采集器的系统实现。现场测试表明,该系统抄收成功率高、通信效果好,有效解决了载波通信盲点问题。

Low-voltage power line carrier channel attenuation,interference and random dynamicity make the carrier communication can not satisfy automatic meter reading system whole collection and coverage construction requirements.TWACS also transmits signal by power line,and uses the 50Hz power frequency signal as its carrier frequency,which is not conflictive with the 3～500kHz carrier communication frequency range.Based on the long transmission distance,high communication reliability and low cost of TWACS,this paper realizes a mixing network composed of carrier and power frequency communication without any additional equipment.Then the system implementation of concentrator and acquisition terminal is discussed,aiming at the given networking scheme.The field test proved that the system effectively solves the carrier communication blind spot problem,with high reading success rate and good communication effect.