| Nowadays with the worse problems of energy shortage, DistributedGeneration(DG) will be important energy technology in the future that userenewable resource.The Main Power Grid always adopts restraint distributedgeneration accessing because it owns the feature of unstable voltage and frequencethat easily impacts the Main Power Grid.It leads to DG be in elementary degree ofcommercialization,thus restricts its development and process of conformationlarge-scale.It will improve greatly the present situation of DG to Micro-gridproposed.Micro-grid could stabilize frequency and voltage that DG exports anddecrease the impact to Main Power Grid.Apart from this,micro-grid could run onisland mode while the Main Power Grid is existing fault.It could ensure powersupply of basic load in microgrid system.So micro-grid could plenty use renewableenergy and increase the reliability of electricity supply.Microgrid system consists of distributed generated and load,and it possessesfavorable reliability and stability.Micro-grid could run in connecting operationmode and island operation mode.With the development of power electronic interfaceand modern control theory,micro-grid combines micro-power that rated power isseveral tens of kilowatt with load,energy storage devices and control devices as asingle controllable unit while supply users with power electric.Micro-grid is aneffective solution to make DG connecting grid,which links large-scale DGandmedium-low voltage grid.In this paper, with the help of Matlab/Simulink simulation software, theestablishment of the various components of the model, simulation of micro-powergrid and isolated operation of two operation modes, isolated operation part of thesimulation, and the simulation of the supply voltage drop conditions.Simulation results show that applying the current double-loop control inconnecting operation mode, as well as in isolated operation mode using U/f controlmode strategy, the micro-grid was running well to ensure that the load is powered. |
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