考虑N-1安全约束的含可再生能源输电网结构鲁棒优化

为提高大规模可再生能源接入系统的运行经济与安全性,提出在考虑可再生能源接入的电力系统中通过输电网络结构优化,在保证安全运行约束的前提下,降低系统运行成本,提高可再生能源的消纳比例。研究将该优化问题分为经济调度问题和N-1校验问题,两个问题交替求解。经济调度问题对输电网结构和机组出力进行优化;N-1检验问题以系统失负荷为优化目标,并考虑重合一条线路作为应急手段。两个问题均可建立为两阶段鲁棒优化模型,利用Benders对偶法求解。进一步提出了模型求解的加速方法,适应于工程实际应用。对IEEE 39节点系统的仿真验证了所提方法的可行性和有效性。

Robust Optimization of Transmission Topology with Renewable Energy Sources Considering N-1 Security Constraint

To improve the operation economy and security of power system with the integration of large-scale renewable energy sources, the transmission topology optimization is studied to reduce the operation costs and improve the consumption capability of renewable energy with the satisfaction of security operation constraints at the same time. The problem is divided into an economic dispatch problem and an N-1 checking problem, which are solved iteratively. The economic dispatch problem optimizes the transmission topology and generator outputs, while the N-1 checking problem takes the loss of load as objective function, and considers switching back a transmission line that has been switched out as an emergency measure. The two problems are both formulated as two-stage robust optimization models, which are solved by Benders-dual method. Furthermore, some measures are proposed to speed up the solving process, which are suitable for engineering applications. Simulation results on the modified IEEE 39-bus test system demonstrate the applicability and effectiveness of the proposed method.