Research On Construct The Distribution Communication Network Based On EPON Technology

State Grid Corporation of China has introduced the concept "Building strong smart grid".Building a strong Distribution Automation is an important part of smart grid. The construction ofdistribution communication network is the key factor in the successful application of DistributionAutomation.This thesis comes from the actual project of power supply enterprise. Firstly， it expatiatesthe background and the significance of the project.On this basis， the thesis presents the conceptof distribution automation and system framework， pointing out the requirements of distributioncommunication network in distribution automation. The requirements are mainly embodied in thefollowing aspects: security， reliability， high speed， real-time and so on. The thesis comparesthe advantages and disadvantages of the current variety of communications networking technologyfrom above-mentioned aspects. Through analyzing the requirements such as network bandwidth，security， real-time in distribution automation in the actual application are also analyzed. EPONtechnology is decided to be used. Because it not only meets the real needs of the project but canalso extend on the basis of the original network.Secondly， according to regional circumstances of distribution network automation inChengXi area， the thesis analyzes the status of communication network. Based on the principle ofplanning and construction， the distribution communication network is designed as follows.Because35KV/110KV substation has realized the full coverage by optical fiber in ChengXi area，the optical fiber communication network can extend to the distribution line. Distributioncommunication network backbone layer should use SDH/MSTP Optical Network to avoid therepeated construction. Access layer should use EPON technology. Because of the large coverageof Distribution automation network and the big number of Distribution terminal， differentnetworking mode will affect the reliability of the whole system in the real project. The thesisanalyzes6common networking modes and its reliability of the whole network. The constructioncost of each mode is also compared. In order to meet the needs of distribution automation systemin communication， as well as achieve the best ratio of profit and cost in construction projectdistribution communication network， after calculation， the network manner of "hand in handprotection" is not only applicable to the structure of distribution network of ChengXi area， but itis also thought to be the most cost-effective. In the construction project，through increasing the light transmission equipment to thecommunication network backbone layer， the reliability of the network and self-healing capabilityof the backbone cyclization can be improved. EPON technology should be adopted in the networkaccess layer and "hand in hand protection" in the network structure. The last part of the paperdiscusses the future direction of the distribution communication network.