Design Of Street Lamp Control System Based On Power Line Carrier Communication

Street lamp lighting is an important part of a city,and a good street lamp management plan plays a great role in promoting the maintenance of the city and the improvement of people’s life.In recent years,with the development of the Internet of Things industry,people pay more and more attention to the research of street lamp control system.Most of the traditional street lamp control schemes focus on the intelligent transformation of street lamps,and the communication mode is relatively simple.When the intelligent street lamps interact with the control unit,the improper management of channel resources will easily cause signal conflicts,thus reducing the operation efficiency of the street lamp network.In view of this problem,this paper designed a more efficient and stable management scheme,this paper mainly did the following work:Firstly,after analyzing the characteristics of various communication modes,the communication mode combining power line carrier communication(PLC)and narrowband Internet of Things(NB-Io T)is adopted as the framework of the whole communication scheme.Establish PLC network to control street lamps in the form of networking.The GDW1376.2 protocol,this paper,on the basis of the optimization improvement,design the communication protocols,dedicated to street lamp control could be divided into slot and the channel time slot in the slot,the uplink signals and descending separate management,effectively reduces the signal,and a reasonable increase agent terminal to forward information,enhance the stability of street light network.Secondly,this paper also focuses on the clock precision adjustment in module networking.By calibrating the clock of the street lamp module in the power line carrier network,high precision clock synchronization can be realized,which can effectively improve the utilization rate of channel resources.However,the traditional clock synchronization method wastes some channel resources due to its low synchronization accuracy.In order to solve this problem,a fractional phase-locked loop with high resolution output frequency is selected in this paper to achieve high precision adjustment of physical layer clock.Software using fuzzy control principle,design the clock synchronization algorithm based on interval,to collect and analyze each receives the timestamp,reasonable adjust clock variables,type study score phase-locked loop on equipment clock frequency adjustment rules,to calculate the optimal clock adjustment parameters,implements all terminal fast and centralized controller clock synchronization,Improve the channel utilization rate,but also can save the network time,for improving the performance of the street lamp control system has a good role.In addition,this paper also realizes the time slot allocation function of street lamp control,time retreat strategy,network access request and confirmation and other functions,and encapsulates the information through JSON format,wireless communication through MQTT protocol,and transmits the information to the upper computer remotely.There are 49 figures,15 tables and 58 references.