| Distribution automation system is an important technical means to achieve reliable operation of the distribution network.With the development of social economy, the deepening of urban distribution network transformation, and to the requirement of power supply reliability and voltage quality is increasing, in human experience-based traditional distribution automation system can not effectively solve the economic, reliable operation, fast and effective fault isolation positioning, reduce the power range and many other problems of distribution network. At the same time, the research of the theory of distribution network analysis and optimization and the development of intelligent distribution network have injected new meaning into the distribution automation system. Achieve an integrated, interactive, self-healing, compatible, and optimization for the characteristics of the new type of distribution network automation system is an effective way to solve the above problem, also is the inevitable developing trend of power system.This article will base on distribution automation sub-project,Against the backdrop of integrated smart grid construction pilot project of the State Grid Corporation in Caofeidian Industrial Zone of Tangshan,combined with an important feature of the new standard of the distribution automation. The analysis focuses primarily on the main technical features of distribution automation system master and function selection, integrated application.put forward the overall goal and design scheme of this project,work out the detailed technical specifications,performance and requirements of the hardware and software, specific focus on the main functions of this project, the distribution network reconfiguration of the normal operation and the intelligent self healing function module of the system are emphatically studied in the theoretical algorithm selection, key technology and practical application.A fast branch exchange algorithm for distribution network reconfiguration is proposed, which is based on the strategy to minimize the network loss of the normal operation of the distribution network. Substituting actual network power losses by approximate power losses, the reconfiguration and optimization of corresponding loop network for each tie switch are conducted. According to the magnitude of optimal transferred loads, the largest power loss reduction of the loop network from branch-exchange is determined, and in the process of reconfiguration without the power flow calculation, which significantly improves the computational speed of the network reconfiguration.Intelligent self-healing module is composed by two parts: fault isolation and power supply to positioning area. Because artificial intelligence used currently consists of many practical disadvantages. Currently the combination of graph theory and heuristic algorithm is a practical method applied for fault location isolation and restoring process in the distribution network.During service restoration process,the problem is divided into self restoration, whole-region restoration, sub-region restoration, load-transferred restoration, and load shedding restoration. The algorithm takes switch operation number and the priority level of the lost load and recover lost load maximization, And compared with other recovery schemes, the optimal power recovery scheme is calculated and selected.Practice has proved pilot projects to achieve the desired purpose, meet the relevant requirements of the smart distribution grid, to further enhance the economic and reliable operation of the distribution network in Tangshan, and enhance the power grid company's economic efficiency and the social efficiency. |
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