Research On Coordinated Operation Technique Of Microgrids And Distribution Based On Hiarchical Control

With growing concerns about energy and environmental issues, promoting structural adjustment of energy, promoting energy conservation and improving the efficiency of energy utilization have become an important direction of development China’s energy industry, especially the electric power industry. The distributed generation mainly takes advantage of renewable energy, as an effective complement to centralized generation, which helps to provide users with low-carbon, efficient green power, and also has an important role in constructing a smarter, cleaner electric power industry.Microgrid, as an effective form integrating distributed power, can achieve full utilization of renewable energy through flexible control technology and improve the quality and reliability of power supply, which, in recent years has become a hot topic. However, with plenty of distributed power access to grid, the distributed nature of the microgrid will become increasingly evident, also the has gradually improved, how to effectively implement the coordinated operation of multiple microgrid and distribution network in the case of high penetration has become an urgent problem.This article focuses on coordinated operation mechanisms of multiple microgrid and distribution network. Based on analysis and comparison of scheduling objectives of microgrid and distribution network, a hierarchical coordinated control structure, containing the component level, the microgrid-level and distribution-level using multi-Agent technology is builded. The scheduling decision process is divided into microgrid-level Agent energy management process and distribution-level Agent coordinated scheduling process, and a hierarchical mathematical model is established. Using genetic algorithms to solve the given model method, and finally, the proposed model is validated based on the IEEE 30-bus standard system. The results are discussed from three aspects:the scheduling strategy, the voltage level and active loss. Numerical results show that the proposed hierarchical coordinated control model can control multiple microgrid to reduce peak loads, improve the voltage level of distribution network and reduce active losses without compromising the autonomy of the microgrid. The hierarchical coordination and control mechanism proposed in this paper can also provide a reference for interactive operation of distribution grid and microgrid in the future.