Redundant Constraints Identification Based Acceleration Method for Multi-Stage Robust SCUC Problems

Security constrained unit commitment (SCUC) problem with uncertainty has become an important research task with the increasing scale of renewable energy access in the power system. Multi-stage robust optimization method has been proved to be effective for solving the UC problem with uncertainty, but it has to deal with the difficulty of excessive computation. The complexity of the UC problem is also increasing due to the rapidly expanding overall size of the power system. A common method to improve the efficiency of solving UC problems is to eliminate redundant security constraints. However, this method is mainly applied to the deterministic UC problems at present. In this paper, a solution framework based on a multi-stage robust optimization method with eliminating redundant security constraints is established. Numerical testing is performed for IEEE 24-bus system and 118-bus system. Most of the security constraints are identified as redundant constraints in different scenarios. The computational efficiency is obviously improved after redundant constraints are eliminated.