Research On Network And Routing Of Meter Reading System Based On Power Line Carrier Technology

The remote automatic meter reading system based on PLC technology, which can replace the manual meter reading system, is an important link in the construction of Smart Grid.The PLC technology can meet the requirements of meter reading on the communication speed and reliability,and has several advantages,such as low cost, convenient installation and maintenance.In PLC meter reading system, concentrator can’t establish direct access path with all the collectors. So relay technology is an indispensable means to establish a stable and reliable communication network and to improve the overall performance of the system. But how to find suitable relay path is a great challenge. Due to the influence of variable loads and various random factors on the low-voltage power line network, the noise and attenuation of the power line channel is very large, also the power line channel has strong time-varying character. So the static routing relay technology is not suitable for the time-varying PLC network.It is necessary to use dynamic routing relay technology to establish a reliable relay path. In addition to routing relay technology, L-PLC channel access is also an important research content of the meter reading system.The power line channel is a shared channel, and the communication nodes in the network may occupy the channel to transmit the information at the same time, which may leads to a channel conflict. Aims to establish a stable and reliable PLC meter reading network, this thesis’ s research work is carried out on the channel access method and the routing technology.This thesis introduces the L-LPC meter reading system and analyzes the channel characteristics and the topology of the system. The OFDM and zero crossing communication technology are also introduced.Then, the thesis introduces the channel access methods of the L-PLC,and research and realize the Carrier Sense Multiple Access with Collision Avoidance and Automatic Repeat Request mechanism in the meter reading system which are used to solve channel conflict and data transmission failures. Several commonly used dynamic routing relay algorithm are also introduced in this sector.According to the shortcoming of flooding algorithm, this thesis studys on the two improved routing algorithm based on flooding algorithm:single frequency network(SFN) algorithm and source routing algorithm. The software of the collectors and the transmission frame format are designed and implemented in this sector.The several routing methods are verified and analyzed in the laboratory environment.The experimental results show that the SFN algorithm and the source routing algorithm can be well applied to the low voltage power line environment.They are much better than flooding routing algorithm in the real-time and success rate performance. Also they have a good anti-destruction performance.