Research And Realization Of Microgrid Control Simulation System

At present,China's rapid economic development,resulting in the consumption of our country and even the world's energy increasing,fossil fuels and other non renewable energy is also in constant failure,the development of nuclear power will be subject to geographical constraints,the energy problem has become the urgent challenge of people.If we can not properly resolve the contradiction between energy consumption and economic development,it will lead to a series of social problems.The realization of diversified and sustainable energy rationing and the development of clean energy are the consensus and inevitable development trend of all walks of life.Distributed power supply can realize power consumption,local real estate,saving many advantages of public power grid construction,reduce the cost and complexity of distribution network line loss and can use solar energy and wind energy and other clean two times,in the rapid development and widespread concern in recent years.But distributed power is a uncontrollable unit for public power grids.Solar energy and wind energy are greatly affected by the environment,and can not achieve stable and sustainable energy output.Simply and violently forcing access to the public power grid will have a big impact on the power grid and even regional paralysis,resulting in direct and indirect economic losses.In recent years,experts have proposed a new distributed power supply organization method,namely micro grid.Micro grid is a number of distributed power together,supporting control system,electricity storage and other auxiliary equipment,distributed power operation unified and coordinated,power output standard,is between the public power and resolve a contradiction to solve the practical case.This paper first introduces the development of microgrid in various countries and regions in the world,and the United States is the earliest and most authoritative country in the field of micro grid.Europe and Japan differ in the micro grid development direction: many European countries,the distance between the power plant,is not easy to form a micro grid,so micro grid Europe focuses more on the various micro grid connection problems,namely,in order to ensure the stability and safety of the.Japan's territory is small and its resources are scarce,so the development of micro grid in Japan is mainly aimed at solving the problem of unitary energy and developing diversified energy society.Although the research time of microgrid in China is short,but the starting point is high,a breakthrough has been made in some key fields,and the microgrid verification project has been established and succeeded.The second chapter mainly introduces the principle of three kinds of distributed power supply,and gives the mathematical model of photovoltaic power generation,and uses the simulation software Matlab/Simulink to build the simulation model,and obtains the output characteristics of photovoltaic cells.The energy storage system in microgrid is also briefly introduced.In Section 2.5,the importance of the distributed power inverter is explained.The control of the distributed power supply can be transformed into the control of the inverter.The third chapter introduces three control methods of distributed power supply: P/Q control,Droop control and V/f control.The principle of each control method is illustrated and the control model is established.Finally,simulation software is used to simulate the effectiveness of the three control methods.The fourth chapter mainly discusses the load switching,distributed power switching and three-phase short circuit to ground fault often appear the phenomenon of using the Droop control method,set up a micro grid peer control strategy simulation model,through simulation test.