考虑大规模风电并网的电力系统区间非线性经济调度研究

Interval Nonlinear Economic Dispatch in Large Scale Wind Power Integrated System

风电的大规模集中并网给电网调度带来了明显的不确定性,基于区间规划模型的调度结果可以为电网运行人员提供明确客观的上下界信息。该文针对计及阀点效应等非线性因素的含风电电力系统经济调度问题,提出了一种区间经济调度非线性对偶优化方法,将风电有功功率描述为区间数,建立乐观及悲观双层非线性经济调度优化模型,结合非线性对偶理论及原对偶内点法求解双层非线性悲观解模型。根据非线性对偶理论,将内层模型转换为对偶模型,合并内外层模型进行求解,从而得到发电成本的区间估计及其相应的发电机出力,为发电决策提供依据。通过含风电场的10机组算例验证了该文方法的合理性。

Power system dispatch becomes having much uncertainty due to large-scale wind power integration into power grid, and the interval dispatch results provides the range of the optimized objective function for operating workers in power grid. This paper proposed a nonlinear dual optimization method for interval economic dispatch, in which the nonlinear factors such as valve point loading effects were considered. Wind power output was described as an interval variable, and bi-level nonlinear optimistic and pessimistic models were set up. This paper combined nonlinear dual theory with primal-dual interior point method to solve bi-level nonlinear pessimistic model. According to nonlinear dual theory, interior level model was transformed to dual model, and the problem was solved after transforming the bi-level model to conventional model. And then the range of total generation cost and the corresponding generator power output were obtained for generating decision-making in the future. A ten-unit test system with a wind farm is used to illustrate the effectiveness of the proposed method.