Optimal Sizing Of Island Microgrid Considering Price-based Demand Response

Island which is a relatively closed system will be restricted by the energy supply limit.The stand-alone microgrid using renewable energy sources including wind energy,solar energy and ocean energy is a new type system of energy supply.In this paper,this paper establishes a optimization model of island microgrid considering the economical and reliable evaluation under demand response.Deterministic optimization and stochastic optimization are used in this paper.The main work and research results are as follows:(1)This paper analyzes the model of distributed generation including photovoltaic cells,wind generation system,diesel generation system and lead acid battery energy storage system.Based on the elasticity of power consumers,the demand model considering price-based demand response is built.(2)This paper establishes a two-level optimization model considering demand response.The upper layer pursues maximum revenue of microgrid by optimizing sizing of generator units.The lower one is aimed at maximizing the power supply reliability through optimizing time-of-use(TOU)price.Particle swarm optimization and interior-point algorithm are used to solve the upper and lower model,respectively.An example is used to compare the three configuration schemes of before and after demand response.The results demonstrate that the proposed two-level model is effectiveness and reasonableness,and TOU pricing can reduce costs and boost profits in island microgrid.(3)Considering the uncertain renewable energy source,this paper develops the robust optimization model using the information gap decision theory(IGDT).Weighted linear method is used to transfer the multi-objective problem to simple target problem.An example demonstrates the economy and robustness of optimization model based on IGDT.