Research On Control Technology Operation And Application Of Microgrid

Under the pressures of environmental protection and energy shortages, photovoltaic power generation has been paid more and more attention.However, as a result of photovoltaic intermittent, mainly to solar and wind energy, photovoltaic power station will affect the stability of the system.As to promote friendly grid connection of a distributed generation technology,the microgrid was proposed to solve this problem. Although in recent years, scholars at home and abroad have studied a lot of the distributed generation and microgrid field,in energy management, planning and design, multi-level coordination control and application of the micro grid have related problems unresolved. so the operation of the micro grid control technology should be analyzed and researched.The major work of this paper includes:(1)According to the load composition and characteristic of a real microgrid system,combination of photovoltaic technology and multiple energy storage technology, models of photovoltaic power, multiple composite energy storage and load control system,was separated by the research.It is provided theoretically the study to the photovoltaic power generation, multivariate composite energy storageand load control system,to be built on the basis of the multistage microgrid ac/dc power grid system.(2)The thesis studied the control strategy of the AC-microgrid and DC-microgrid, proposed a based on hierarchical control technology of ac/dc hybrid multilevel network coordinated control strategy, implements the ac/dc hybrid multilevel micro power grid security and stability, economic and efficient operation. The control strategy of multivariate composite energy storage system was studied, provided the guarantee that had supplied the stability of the power reliability and operation to the whole micro grid system.(3)According to the different operation control demands, the thesis proposes a multiple time scale energy management methods that contains electric vehicle charging pile of AC/DC hybrid multilevel grid. It effectively improves the micro grid investment returns and energy efficiency, to achieve the complementary advantages.(4) The thesis builds the simulation model of micro grid system,puts forward to considering the peak-valley electricity energy storage control strategy, and have a different control strategies of microgrid experiment in period of time.Using constant dc bus voltage control strategy, aimed at different operating conditions, the study experiences the dc voltage stability respectively. In addition, it carrys on the simulation research to the energy storage system of the grid pattern off-grid mode control strategy.The research results show that the micro grid system is security and stability at the operation of the control strategy.