Reliability Analysis Of Micro-grid Using Sequential Simulation

As the future direction of the grid,micro-grid in a flexible mode of operation and to provide environmentally friendly,stable energy supply and have the advantages of sustainable development has more and more attention from various countries.At the same time,the new energy access also to the stability of the micro grid operation has brought a certain impact,making the micro network reliability assessment analysis becomes complex and difficult.In this paper,through the establishment of micro network power and the energy storage device output reliability model,Based on micro-grid full operational status and timing characteristics of reliability evaluation,using the timing Monte Carlo method respectively analysis islanding and grid-type micro network reliability.As the important part of the isolated island micro-grid,operation strategy of the energy storage system has a direct influence on reliability of micro-grid.at first we establish the evaluation model of the islanded micro-grid power generation and energy storage,analyzes the characteristics of the isolated island micro-grid reliability evaluation,Then based on the idea of dividing the load presented under island mode load shedding subtractive principle;Finally,through micro-power power output and the load demand,study three different storage operation strategy and analyze its impact on reliability;Based on the research above,by changing the energy penetration and storage capacity size analysis the impact of island micro-grid system of indicators SAIDI.Has a great influence on the reliability of power supply output coordination strategy of micro-grid and grid connected mode of network micro-grid.Firstly,by minimal path method analysis grid-connected micro-grid the forming process of network interconnection and the islands,to study the micro grid mode power output to coordination strategy;Secondly,based on traditional indicators,based on the purpose of grid-connected micro-grid stable power supply,proposed two new micro network reliability indices: the islands of the average time of successful run continuously and the probability of successful operation;Finally,by changing the position of power in the grid and energy storage capacity of the size,analysis the influence of it to the network reliability.Simulation results show that: First,the micro network access toeffective measure of improving the reliability of distribution system;Second,micro network internal distributed power to select proper place access to a certain extent,improve power supply reliability of the system;Third,increase the energy storage capacity within the appropriate range,can improve the reliability of grid connected micro network indicators.