Study On Micro Grid Modeling And Its Connecting Operation Mode

With energy shortages and environmental problems become increasingly serious, Power generation from photovoltaic cells,wind generators,,fuel cells and other clean energy or clean and efficient power generation equipment consisting of a distributed power model of its unique superiority has been attention. However, the existence of contradictions between Main Network System and Distributed Generation. In order to fully exploit the value and benefits from distributed energy for the Main Network System and users, Further improve the controllability of power system operation, flexibility, and economy and to better meet the user power quality and power reliability requirements, micro grid technology have emerged, and quickly received domestic and foreign experts and scholars in a wide range concern.This paper first analyzes the micro grid at home and abroad Research, analysis of micro grid's basic composition and structure, and establishes of micro grid of the various components of the mathematical model, and studied micro grid basic control theory.Micro grid's connecting operation Control is running Micro grid's key technology. Papers focused on the micro grid's connecting operation and island operation mode, Papers based on PSCAD simulation software, set up with double-fed wind generators, constant impedance load, constant power load, motor load of the micro grid simulation system. Comparative studied two connection mode:used VSC connected micro grid and Main Network System; used the traditional static switch connected micro grid and Main Network System. Simulation results show that using VSC connected micro grid and Main Network System's technical performance is better than using the traditional static switch connected micro grid and Main Network System. Because the VSC in the two kinds of operation modes may use its own power electronics devices fast controllability to control the voltage and active power regulation to guarantee the stability of the micro grid operation and power quality.