Design And Implementation Of Collection Unit In On-line Monitoring System Of Distribution

On-line monitoring system for distribution lines provides a guarantee for the robust operation of smart grid.As a communication hub in the distribution on-line monitoring system,the collection unit has received more and more attention for its reliability and real-time.With the construction of distribution network,the traditional collection unit has been unable to meet the demand.This paper designs a new type of collection unit,and the communication module of the collection unit based on LoRa mode that adopted direct sequence spread spectrum communication.The low power consumption,long transmission distance and multiple power supply modes can meet the needs of long time uninterrupted operation.Design the wireless ad hoc network and related communication protocols.The communication of collection unit has the features of good real-time,high reliability and the collection unit designed meet the needs of distribution line on-line monitoring system needs.This paper analyzes the requirements of the collection unit in the information communication and processing,according to the analysis put forward the integral design concept and the design scheme.Then studied and design the hardware and software of the collection unit,using STM32F103 as the processor,SX1278 wireless communication chips as a wireless transceiver and SIM900 A as GPRS communication module to design the wireless communication module and write a corresponding program to achieve the wireless transceiver tasks of collection unit.According to the characteristics of wireless communication and reference the wireless ad hoc network technology,the article also describes the networking process of a collection unit wireless ad hoc network,developed the ad hoc network communication protocol and software implementation.At the same time,this paper uses the binary exponential backoff algorithm to avoid the collection unit and acquisition unit emergency congestion.Finally,complete the relevant tests,the results show that the design of the system accurately completed the task of wireless transceiver.