Several Technology Optimization Based On Process Level Communication Network Of Intelligent Substation

With the development of smart grid, intelligent substation will be more smart, informatization. The utilization of intelligent primary equipment based on IEC61850 and networked secondary equipment provides a convenient way for information sharing of substations. Since intelligent substations fulfill such roles as information collection, transmission, processing and output, As the core element of the substation construction, smart substation communication network has important practical significance for the safe and reliable operation of the smart grid. The introduction of process layer unified communications network brings changes to the equipment related functions of the substation, how to make use of information shared on the network to optimize the original technology to make the function of substation equipment more intelligent has vital significance.This thesis puts forward three aspects of technology optimization based on process level communication network of the process level communication, which are the intelligent substation integrated information scheduling strategy; way of receiving data of differential bus protection; and the state of the communication network evaluation methods.In aspect of the comprehensive control strategy, it summarizes the advantages of all kinds of scheduling policy, and modifies the traditional weighted fair queue scheduling algorithm on the basis of in view of the characteristics of communication network information flows, a comprehensive information scheduling method is proposed. According to the proposed scheduling strategy, data models of several kinds of information flows in process level are modeled, and the analysis of flows’ end-to-end delay under different scheduling algorithm using network calculus theory, and gives a contrast with OPNET simulation software simulation results to verify that the proposed scheduling algorithm can satisfy the real-time of the information flows in any condition. In aspect of optimization of receiving data of differential bus protection, using the method of different priority setting to reduce the delay of sampling value data in the network transmission based on the process characteristics of the PRP network, the simulation of the proposed optimization method in OPNET verifies its superiority. In aspect of network state evaluation, an analysis of network performance evaluation index is given, a multi-index synthetic method is proposed to evaluate network performance. And an example of a typical 220 k V substation research is given to clarify how to evaluate substation network performance by using the multi-index synthetic method through OPNET simulation.