| The emergence of micro grid,solved some defects of traditional grid and connection problems of renewable energy to grid.However,it produces problems such as synchronization/step out between micro grid and main grid.Therefore,the switch between connection mode and island mode of micro grid becomes hot research topic.With the increase of renewable projects and development of all kinds of micro grid and energy storage station projects,Scholars pay more attention on the change from seam switch to seamless switch and active seamless switch,and high technology of passive switch.The requirements of switch between connection mode and island mode of micro grid are satisfied by seamless switch technology.Uninterruptible supply for sensitive load,compensation with main grid,reliability supply to customer are solved by seamless switch technology.This paper proposes a scheme to realize seamless switch of micro grid by seamless switch technology of energy storage system.Studying and improving control strategy of energy storage converter,drooping control technology and micro grid multi-devices working strategy.Proposed a control strategy of micro grid based on seamless switching control of energy storage converter.The simulation model of micro grid is established by RTDS simulation software,and the control strategy is validated by the simulation of the micro grid mode switching.After simulation works,this control strategy were verified by several real engineering projects.Through the analysis of practical engineering application,the rate of seamless switching is at high level.Micro grid is reliable by using this control strategy,realize uninterrupted power supply,test and engineering applications achieved desired results.The seamless switching control mode of the energy storage system in this research is extensible,not only for the micro grid mode,but also for the storage power station in main grid. |
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