计及高比例新能源电网分区的输电线路功率双层优化模型

随着波动性极强的风光电大规模并网，高比例新能源电网中输电线路常常呈高传输功率峰谷差、低输电效率的状态，影响电力系统的安全稳定运行和新能源的大规模消纳。为此，提出分区分层优化输电线路功率的思想。首先，利用所提指标对电网进行分区，使区间联络线成为电网中待优化输电线路。在分区基础上建立区间-区内双层优化模型，上层模型用以确定传输功率峰谷差最小且输电效率最高的区间联络线期望功率，下层模型引入区内源荷运行约束，寻找最大程度实现联络线期望功率下系统运行成本最小的源荷协调调度计划。分别选用NSGA-Ⅲ-DE算法和NSGA-Ⅱ算法迭代求解上下层模型。最后，通过甘肃电网实例仿真，证明了所提模型的可行性和有效性。

Transmission Line Power Bi-level Optimization Model Considering High Proportion New Energy Grid Partition

With the large-scale grid connection of wind and solar power with strong fluctuation， the transmission lines with high proportion new energy grid often has high transmission power peak-to-valley difference and low transmission efficiency， affecting the safe and stable operation of power system and large-scale consumption of new energy. Therefore，the idea of optimizing transmission line by partitioning and layering is proposed. Firstly，the proposed index is used to partition the grid，and the inter-partition tie line becomes the transmission line to be optimized in the grid. On the basis of grid partition，Interval-region bi-level optimization model is established. The upper model is used to determine the inter-partition tie line expected power with the lowest peak-to-valley difference and the highest transmission efficiency. The lower model introduces the intra-partition source and load operation constraints to find the source and load coordinated scheduling plan with the minimum operation cost under the maximum expected power of the tie line. NSGA-Ⅲ-DE algorithm and NSGA-Ⅱ algorithm are used to iteratively solve the upper and lower models respectively. Finally，the feasibility and effectiveness of the proposed model are verified by the simulation of actual grid in Gansu Province.