Distributed Power Self-Control Strategy And Coordination System In Microgrid

Recently, micro-grid, made up of distributed power, is becoming the research focus of many scholars by its high reliability and sustainability. The focus of their research is still in the traditional centralized control strategy, however, such a strategy still has some deficiencies in solving the high penetration, power generation autonomy and economic issues of distributed micro-source, as well as micro-grid coordination problems.Therefore, this paper focused on establishing a reasonable and reliable micro-grid model and energy management mechanism, and conducted a study around the high penetration of distributed power and the coordination of micro-grid. Using the hierarchical control structure of micro-grid is its core, including the layer energy optimization algorithm coordinated control of micro-grid, and the lower fuzzy decision-making algorithm as well as the micro-source power ring and current loop of double-loop control.Firstly, this paper introduces the basic structure and the development of the micro grid. Then list the category of the micro power sources used in this paper, including synchronous generator, permanent magnet direct drive wind power generator, the doubly-fed induction generator, photovoltaic cells, etc.; Finally, the micro grid hierarchical control strategy and the two PQ, V/f control strategy of the converter have been studied.Besides, aiming at the high penetration of distributed power supply and the economic efficiency of the micro grid, the fuzzy self-discipline control strategy based on SOC, real-time electricity price, DG maximum power has been established, it optimizes the process of the charge and discharge of the energy storage device. Then respectively build the (2+2)kW PV and energy storage system simulation,(5+2.5)kW of the permanent magnet direct drive and energy storage system simulation, in order to verify the effectiveness of the strategy.Third, on the basis of fuzzy self-control strategy, according to the distributed micro-source economic operation and pollution control costs, Agent decision-making autonomy and the dynamic response characteristics of the different micro-power, the objective function of the algorithm was built. Coordinated control strategy based on improved particle swarm optimization algorithm of the micro-grid energy was put forward to realize the overall optimal micro-grid, and the optimal power allocation for distributed generation micro-source was determined.Finally, the software development was based on Visual Studio2005platform. As the micro-grid energy management software had been developed, the working procedure of correlative energy optimization algorithm was compiled, and the examples of fourth chapter were analyzed.This thesis got the conclusions of studying the high penetration of distributed power in the micro-power model, and established the energy management system of micro-grid. These will bring some engineering application value for optimizing mechanism of the micro-grid operation and management and improving the overall efficiency of the micro-grid.