Research On Flexible Power Source Planning Of Autonomy Micro Grid

Since renewable energy resource is universally accepted as a promising method to solve the global energy problem,the optimal planning and utilization of various distributed generators(DG)and energy storage(ES)devices deserve a special concern.ES devices possess various characteristics in power density,energy density,response speed(switching time)and lifetime.Besides,as different load types have various requirements on power supply reliability according to their importance,a coordinated planning with consideration of reasonable matching between power source and load can efficiently improve power supply reliability and economic efficiency via customized power supply and compensation strategy.This paper focuses on optimization of power source capacity in microgrid and a coordinated planning strategy is proposed with integrated consideration of characteristics of DG,ES and load.An index named additional compensation ratio(ACR)for balancing economic efficiency and reliability is proposed and considered in the strategy.The objective function which aims to minimize life cycle cost(LCC)is established considering economic efficiency,reliability and environmental conservation.The proposed planning strategy and optimizing model is calculated and verified through case study of an autonomy microgrid by using chicken swarm optimization(CSO)algorithm.The calculation result is analyzed and compared with that obtained via PSO algorithm.The proposed planning strategy can achieve balanced and coordinated trade-off between economic efficiency and reliability,and the relationship between the proposed ACR index and optimized LCC can provide guidance for decision-makers under different scenarios with various requirements of the planning scheme.