基于混合儲能的光伏發(fā)電并網控制策略研究
[Abstract]:Energy crisis and environmental crisis have greatly promoted the development of new energy, such as wind energy and solar energy. However, the output power of new energy systems, such as wind and solar energy, fluctuates greatly by climate and weather, which will have a great impact on the quality of electric energy and the stability of power systems when connected to the grid. Therefore, photovoltaic power generation systems require sufficient capacity energy storage equipment to provide stable power to meet quality standards. In the traditional distributed generation, the energy storage unit mainly controls the charge and discharge of the battery to realize the storage and transfer of energy, which will still have a great impact on the grid when connected to the grid, resulting in the fluctuation of bus voltage. At the same time, it is very disadvantageous to the life of the battery itself. Therefore, the hybrid energy storage system is applied to the grid-connected photovoltaic power generation system, and a small micro-grid system is constructed by combining the characteristics of the photovoltaic power generation system and the energy storage system. First of all, the basic composition and principle characteristics of photovoltaic power generation system are studied, and the various components of photovoltaic power generation system are analyzed and studied in detail. Finally, the equivalent model of photovoltaic cells and the output characteristics of photovoltaic cells are given. Some key technologies in grid-connected control of photovoltaic power system are studied in this paper, which provide theoretical and technical support for the research of grid-connected operation of micro-grid. Secondly, a control method of photovoltaic maximum power point tracking (MPPT) is proposed and the principle of storage battery and super capacitor energy storage is analyzed. The characteristics of their application in photovoltaic power generation system are obtained. At the same time, the hybrid energy storage system modeling and simulation analysis are carried out after combining the two characteristics, which can complement each other with each other. The DC bus voltage balance control strategy which can realize the fast response of battery-super capacitor is proposed. At the same time, the photovoltaic inverter used in grid-connected research is studied. The inverter is controlled by constant power control strategy, and the correctness of the control method is verified by modeling and simulation. Finally, on the basis of the previous research, Matlab/Simulink is used to build the microgrid model combining photovoltaic system and accumulate-super capacitor energy storage system, and the characteristics of the system are analyzed. The simulation results show that, The grid-connected control strategy of microgrid based on hybrid energy storage has certain advantages and correctness, which verifies the feasibility of grid connection after the hybrid energy storage system is added in photovoltaic power generation system, and can reduce the impact of instantaneous energy imbalance on the grid. Therefore, it provides some theoretical reference and technical support for the practical application and development of microgrid.
【學位授予單位】:東華理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM615
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