In micro grid, the distributed generations have a large proportion and the energy storage system is the fundamental structure of the micro grid. Wind and photovoltaic power generation contain intermittent and uncertain characteristics. Energy storage system in micro grid can smooth the volatility of distributed power and supply power to important loads in case of the insufficiency of distributed power generation. In this paper, a location and capacity planning method of energy storage system is proposed. The energy storage installation points are the key points of the system, which are identified based on the electrical distance. Further, the capacity is optimized and solved on these basics. Finally, the effectiveness of the proposed method is verified through case studies.
In the traditional DC micro-grid, the structure is complex, the control is difficult and there is no fixed networking mode. Thus the construction of micro-grid is expensive and the output is slow. In this paper, a hierarchical control method of modular multi-terminal flexible DC micro-grid is proposed, which simplifies the structure and control method of DC micro-grid and is beneficial to the construction of micro-grid. The structure of flexible multi-terminal DC micro-grid and the modularized method of network construction are discussed. The feasibility of the study is confirmed by a specific example of DC micro-grid. On the basis of the above research, the hierarchical control method of DC micro-grid, the specific control method and control logic in each layer are determined. PSCAD/EMTDC simulation is established to verify the effectiveness of the proposed theory and control method.
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