Root-cause Analysis of Renewable Curtailment Based Integrated Power System Optimal Planning in Power Spot Market

Renewable generation is rapidly developing along with dual-carbon strategy. Power spot markets are established in 8 provinces in terms of national market reform of power industry. Accordingly, conventional power system planning should be adjusted to accommodate to the new era power system. In the paper, an optimal integrated planning method in the purpose of meeting renewable accommodation target with consideration of economic impact to the spot market is proposed. A chronological production cost simulation model with security constraint unit commitment and locational marginal price calculation is used to simulate the power spot market. A root-cause analysis of renewable curtailment based on simulation results is designed to initially determine planning alternatives including transmission upgrades and energy storage systems. Optimal integrated planning is achieved based on the quantitative analysis of economic impact of planning alternatives using the simulation model. A case study using an actual provincial power system with spot market environment shows that the proposed planning method is able to provide the economically reasonable planning alternative with meeting renewable accommodation target.