| With the development and usage of renewable energy sourse,renewable energy generation has been one of the developments of power systems in the future,especially with the help of micro-grid technology,which solves the problems of high access costs and single DG control.In order to achieve the technical characteristics of micro-grid better,electric energy storage technology is regarded as one of the core technologies in micro—grid,especially the PCS bidirectional inverter technology,which plays all important role for utilizing renewable energy with high efficiency and on the stable operation of micro-grid.First,this paper analyzes the intelligent micro-grid system structure of shenyang engineering institute.We analyze generation characteristics of the renewable energy and establish the prime mover mathematical model of micro-turbine of photovoltaic array and wind turbine.PV power generation systems includes monocrystalline silicon and polycrystalline silicon solar cell array and the wind turbine power system adopts a direct-drive permanent magnet synchronous constant frequency/variable speed machine,which are chosen as the main power of micro grid unit.The paper analyze the working principle and physical model of super-capacitor and battery,which are PCS two-way energy storage system.Battery is used to store electrical energy because the price is cheap and large capacity,super capacitor is used to improve power quality because of response speed is rapid.So this system chose hybrid battery and super capacitor energy storage system as a backup power storage part of the whole micro-grid system.Because of parallel operation and isolated operation and switch operation mode exist in this system,and according to the corresponding operation mode,intelligent micro grid system develop a different control strategies This systerm provides a validation experiment platform for subsequent experiment,future researchers can perform science experiments on this platform with good feasibility and practicability. |
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