The Power Flow For Islanded Microgrid Based On Big Bang-big Crunch

Reducing of non-renewable energy,the increase of environmental pollution has become a powerful block restricting China's development and progress.As support of power failure,the grid can be converted to an island model,are not ripe the influence of the distribution network,improve the reliability of power supply.But when the micro grid into an island model,lost the power of power grid,the ordinary power flow calculation method is not applicable to an island micro power grid.And power flow calculation is all kinds of power system stability,reliability and safety analysis foundation,therefore,to study the property of micro grid island an effective power flow calculation method is imminent.This article fully considers the island micro grid exist different distributed power control mode,including the Droop control?constant power control and constant pressure control three kinds of control mode,was proposed based on the Big Bang,island new micro grid power flow calculation method of the algorithm.Handle DG device for PQ node and PV nodes and sagging three types,sagging node flow calculation model is set up;Analysis of nonlinear equations solving node power,and convert it to unconstrained optimization problem,in the use of the big bang algorithm solving,get the system steady-state frequency and each node voltage.Finally,in order to improve the node test system for example,in the Matlab simulation platform to verify the feasibility of the proposed method.Finally,considering the big bang algorithm relies heavily on the diversity of the candidate solution,shortcomings and so on easy to fall into local optimal solution,the algorithm was improved.First of all,will be the center of mass generation into the contemporary solution as singularity solution,increase the contraction speed;Secondly,the combination of particle swarm optimization path optimization,improving the quality of pieces solution;Finally,introducing the theory of the big tear increase diversity stage pieces solution the big bang and the ability to jump out of local optimal solution.Using the improved algorithm on Matlab platform to verify the correctness,and comparing with the original algorithm,has proved its superiority.