Research On Networking Method Of Power Line Communication Applied In Distribution Network

Taking the power system as the core and link,and based on Internet thinking and technology,the energy Internet pursues multi-source complementarity horizontally and realizes "source network load storage" coordination vertically,so as to realize the high integration of energy and information.Communication network is one of the key technologies to realize energy Internet.PLC(power line communication)has natural network channel resources,low cost,flexible and convenient application,so it has become one of the important choices of distribution network.But the power line channel has the disadvantages of bad working environment,serious interference and large time-varying,and the structure of medium voltage distribution network is more complex.There are many branch lines and distribution transformers along the line,and the phenomena of signal reflection,standing wave and resonance are very easy to occur in the transmission.Therefore,it is of great significance to design a strong enough networking scheme to form a practical carrier communication network and even the development of PLC technology in medium voltage distribution network.In this paper,the medium voltage distribution network PLC networking optimization method is studied in-depth,the topic has important theoretical significance and engineering practical value.Firstly,according to the types,structural characteristics and physical characteristics of power transmission lines,the distribution parameters of each unit length of overhead lines and cable lines are estimated.Combined with the transmission line theory and the characteristics of carrier channel,the attenuation of carrier signal in the transmission process of power line and the attenuation of each connecting node are calculated,which lays a theoretical foundation for the next networking.Secondly,based on the actual topology and channel environment of medium voltage distribution network,a PLC networking method based on genetic algorithm is proposed.In this method,the actual distance between nodes,the attenuation of links between nodes,the attenuation of connecting nodes,the value of nodes themselves and the value of links are comprehensively considered.The maximum value function of the network is calculated by using genetic algorithm to determine the optimal link set of the network.On the basis of the optimal link set,the node degree of each communication node is calculated,and the larger node degree value is used as the relay node of the network,so as to complete the optimization of the distribution network PLC networking.Finally,MATLAB software is used to verify the effectiveness of the algorithm,and compared with ant colony algorithm.This algorithm takes into account the actual topology and channel characteristics of distribution network,which makes relay node and link allocation more reasonable and has higher network value;Moreover,the number of relay nodes in this algorithm is relatively low,which can reduce the number of data forwarding,accelerate the networking speed,and improve the network resource utilization and transmission efficiency.