Research On Wind-storage Micro Grid Based On VSG Control

In recent years, with the energy problem and environmental problem are more and more serious, the renewable energy has been developed vigorously by the countries all over the world. Wind energy as an important part of renewable energy, how to interconnection flexibly has been the important researching direction. The micro grid with the distributed generation is independent, and the unit is complex. So friendly to the interconnection of the micro grid and play this characteristic, is currently an important direction of micro grid research.This thesis is for the needs of the wind and energy storage system in the micro grid, analyzed the wind system and energy storage system’s model and analyzed the micro grid controling technology. In considering the synchronous generator to the grid power balance and voltage support role, with the wind storage system and RSC equivalent for synchronous generator simulate the generator inertia characteristics. Based on the characteristics of micro power grid, design active power-frequency controller and reactive power-voltage controller. Adjust the power to improve the power control and voltage stability of wind storage system. And in the MATLAB/Simulink build virtual synchronous generator model and analysis the interface of the virtual synchronous generator voltage frequency characteristic. Validating the method is effective. And the micro grid operate interconnection/island both cases, study the stability of voltage and frequency of the system operation. The simulation results show that the method can restore the frequency stability in a short time, and reduce the fluctuation of voltage in under two kinds of running state, improve power quality.For the problem of energy storage system coordinated with wind power output. This thesis proposed the based on fuzzy adaptive control of the energy storage unit wind to store the control strategy of the system output inertia compensation, to improve the system frequency response speed. And under different wind conditions, the simulation analysis, the result of simulation shows that the method is effective.