Security-Constrained Unit Commitment with Flexible Uncertainty Set for Wind Power Generation

In this paper, a new formula for AC unit commitment problem with safety constraints is proposed, which can express the uncertainty of wind power with bounded interval. The proposed SCUC model can flexibly adjust the width of the interval by selecting an appropriate confidence level, so as to achieve a good compromise between security and economy. In addition, the proposed SCUC model is equivalent to a two-stage stochastic programming problem in one expected case, while the second stage represents the corrective operation in two extreme cases. In order to deal with the large-scale and integer mixed nonlinear characteristics of the model, a new calculation strategy based on generalized Benders Decomposition is developed to solve this problem and obtain robust commitment plan to withstand the worst-case realization of uncertain wind energy. The proposed SCUC model is illustrated by IEEE 9 bus and 118 bus test system, and its advantages over the existing random programming technology are verified. The simulation results show that the proposed method is applicable to UC problem with uncertainty of wind power generation.