Analysis For Voltage Stability Of Micro-grid Connected To Grid

With the global energy crisis and environmental pollution problems intensified,people began to study clean energy to replace the traditional high energy-consuming power generation.Micro-grid to solve the distributed power supply can not be a lot of intervention in the traditional power grid,and the single input cost is high,difficult to control the problem,making the role of a single distributed power to give full play to overcome a single distributed power supply adverse effects on the grid The new direction of development.Therefore,it is very important to study the voltage stability of the micro-grid.This paper introduced the development of microgrid and the basic structure,and the establishment of micro-grid model,including a variety of micro-power and micro-power-related converter interface model.Based on the special node type of microgrid,the improved forward-backward method is used to calculate the power flow,and the improved immune genetic algorithm is used to calculate the static voltage stability margin.Finally,the influence of different types and quantities of micro-power access,the grid-connected position of the micro-grid and the access capacity on the static voltage stability are analyzed by simulation.