Research On The Simulation And Control Strategy For DC Micro-grid

Energy and environment problem is becoming more and more serious with the development of society,and the development of traditional power grid is restricted by this.So in such a situation,it is very important to develop and apply new renewable energy effectively.And this form of providing electricity—distributed power is getting more and more attention.In addition to the advantages of environmental protection and renewable,the distributed power also can consume energy in the local and save the cost of transmission and distribution.However,some disadvantages of distributed power itself also make its development been limited.For example,the distributed power has the features of stochastic volatility,poor controllability and high costs of access.However,the issue of distributed power access the main grid is solved by Micro-grid,and Micro-grids can create more space for the application of distributed powers.The DC Micro-grid that researched in this dissertation is not researched in detail in recent years,but compared to traditional AC Micro-grid,DC Micro-grid has its own advantage in energy transportation and distribution,and therefore,the prospects of DC Micro-grid must be great.This paper based on a software named PSCAD(Power Systems Computer Aided Design),and analyzes the basic principle of wind turbines and photovoltaic cells.Two kinds of distributed power,load and main grid are attached by DC bus,and all of them constitute the model of DC Micro-grid.In this paper,effective control strategy is added in the DC Micro-grid model to improve the stability of the DC bus voltage,and simulate the DC Micro-grid in the situation of linking to main grid.Analysis the simulation data and add some disturbance such as load changing and the power changing of the distributed power and so on to prove the effectiveness of the control strategy to the whole system.