Decomposed unit commitment model for long term system with large scale wind power penetration

The traditional strategy to solve unit commitment problems for large-scale power system usually ignores the optimized model and only focuses the optimized algorithm to accelerate the solving rate. Thus a decomposed unit commitment model is proposed to accelerate the unit commitment, and the wind curtailment density is considered to assess the wind curtailment. In the decomposed unit commitment model, the continuous variables are separated to discrete ones. The model enables to eliminate the feasible solution space, and then the optimal solution can be sought from the narrow space quickly. The wind curtailment density curve gets better than the expected wind curtailment value to assess the distribution of wind curtailment. For the proposed model and the real province power grid, the speeds of traditional unit commitment and the decomposed unit commitment are discussed, and the wind curtailment density curve is employed to estimate the distribution of wind curtailment, on which the system wind curtailment develops from the center to the two sides.