中文摘要：

随着风电出力在电力系统中渗透率的逐步提高,其不确定性给系统安全与经济运行带来了新的问题甚至挑战。在制定电力系统运行方式和调度计划时如何确定计及安全约束的机组最优组合（security constrained unit commitment,SCUC）策略就是一个需要解决的重要课题,也是该文旨在研究的问题。具体地,首先建立基于场景生成的鲁棒优化安全约束的机组最优组合（robust security constrained unit commitment,RSCUC）模型,由此获得的鲁棒机组组合策略满足给定的置信度,对处于置信区间之外的极端场景则采取弃风或切负荷等不得已的措施来维持系统功率平衡,从而在系统运行的经济性和保守性之间合理折衷。之后,采用Benders分解法求解所建模型,将该问题分解为主问题和子问题。其中,主问题为确定性的SCUC问题;子问题则对考虑风电场出力随机变化时的系统状态进行安全性校验,若通过校验则表明所求得的SCUC策略满足鲁棒性约束,否则就生成相应的安全约束即Benders割并反馈给主问题。最后,采用修改的IEEE 39节点系统来说明所提方法的基本特征。

英文摘要：

Due to the ever-increasing penetration of wind power in power systems,the uncertainties of wind power outputs have brought significant problems or even challenges to the secure and economic operation of the power systems concerned. Hence,in making the scheduling scheme and dispatching strategy howto address the security-constrained unit commitment（ SCUC） problem is a very important issue to be investigated,and is also the focus of this paper. Specifically,a scenario-based robust security constrained unit commitment（ RSCUC） model is first presented,and the RSCUC strategy such attained meet a given confidence level,while for some extreme scenarios beyond the confidence interval wind power abandoning or load shedding will have to be employed. In this way,a reasonable tradeoff between operating economics and conservatism can be implemented. The proposed model is next solved by the well-established Benders decomposition through decomposing the original problem into a master problem for deterministic unit commitment（ UC） and a sub-problem for feasibility checking. Feasibility cuts are generated and fed back to the master problem for the next round of iterations if the strategy attained from the master problem cannot pass through the feasibility checking. Finally,the basic features of the proposed method are demonstrated by a modified IEEE 39-bus system.