| With the fast development of the economics and society in China,traditional fossil energy israpidly depleted,it has also caused serious damage to the global acological environment..The task of developing renewable energy is imminent..Distributed generation technology can efficiently utilize renewable energy for power generation.Microgrid is a small power distribution system that integrates a variety of distributed generators and energy storage devices,it can operate both in island mode and grid-connected mode.In the planning and design stage of microgrid,the location and capacity of various distributed generations should be determined..The operation of microgrid needs to consider factors such as electricity price,load and meteorological resource,and the economy can not be too poor.This thesis analyzes the model of wind turbine,PV system,diesel generator and energy storge system,the structure of wind-solar-diesel generator and storage AC-DC hybrid microgrid is constructed.This paper introduce the basic principle solving steps of PSO,and compares it with other common algorithms.The optimization process is based on specific objective functions and constraints,the relationship between power supply economy and self-balancing rate of microgrid is analyzed.a programming software and PSO are used to solve the optimal sizing problem of microgrid.The power volatility in interconnection line and the renewable energy utilization rate are put forward..The effects of different self-balancing rates and transferable loads on the power supply economy of microgrid are analyzed.The influence of real-time tariff mechanism and different weather conditions on the economic operation of grid-connected is summarized.The optimal operation model of microgrid is established,compared with the optimization results obtained under the conventional control strategy.PSO is used to simulate the optimal operation of microgrid in Matlab,and the optimal result of economy is obtained. |
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