Multi source Co-optimization Approach for wind power system based on power generation flexibility margin

It is widely known that co-optimization between multi-type power sources is an effective measure to smooth stochastic fluctuations in renewable power and improve the level of renewable energy accommodation. In this paper two indices called upward-regulation flexibility margin and downward-regulation flexibility margin are put forward from the viewpoint of balance between operational flexibility supply and demand, which are used to optimize the limited flexible resources to deal with the adverse effects of large-scale renewable energy. On this basis we formulate a wind-hydro-gas-thermal coordinated optimal model in which the renewable energy accommodation and total cost are taken as the objective, All case studies have been solved using CPLEX 12.3. The aim of this paper is to promote the renewable energy accommodation and also the system efficiency from both the economic and security point of view. The reasonableness and effectiveness of the proposed methodology is validated by case study.