Comparative Analysis on Optimized Configuration Models of Distributed Generations in Stand-alone Micro-grid

The aims for optimized configuration of distributed generations in micro-grid are to reduce the economic cost, and to improve the reliability of power supply and environmental performance. The topology structure of the stand-alone micro-grid with wind/PV/diesel/battery energy and the optimized configuration models of distributed generations are discussed. The annual minimum cost of the system is taken as the optimal economic objectives, and the reliability and environmental performance are considered as constraints conditions or added into the optimal economic objective. Therefore, four types of multi-objective optimal models which combine economy, reliability and environmental performance are respectively built. The load level and natural resource, such as annual wind speed, air temperature and solar irradiance are regarded as the input information, and the particle swarm adaptive algorithm is applied to solve the optimized model to obtain the optimal configuration schemes of distributed generations for wind/PV/diesel/battery energy micro-grid. The differences of configuration schemes under four types of optimal models in the case system are compared and the corresponding reasons are analyzed thoroughly. Through sensitivity analyzing, reasonable modes of the environmental performance and reliability are obtained, which can provide helpful guidance to the related research and the actual engineering design.