Robust Security-Constrained Unit Commitment Using Benders Decomposition

This paper presents a novel formulation of stochastic security-constrained unit commitment (SSCUC) under interval uncertainty. The proposed formulation considers more practical and nonlinear constraints than previous researches, such as AC network modeling and voltage magnitude limits. Moreover, the SSCUC model has a two-stage stochastic frame, in which the first-stage represents the day-ahead market by one expected wind power scenario, and the second-stage denotes the corrective operations via two extreme scenarios. In order to deal with the MINLP nature of the model, a GBD-based decomposition algorithm was applied to solve the problem, and a robust commitment plan was obtained in the case of the worst uncertain wind power. The SSCUC model along with the decomposition algorithm is illustrated using the well-known 9-bus system. Simulation results verify the effectiveness of the suggested strategy.