考虑解列控制的输电网扩展规划研究

Transmission Network Expansion Planning Considering Disjoint Control

建设坚强可靠的智能电网是输电网规划的核心环节,解列是应对电网失步振荡的重要控制手段。系统失稳时的失步断面主要分布在被称为弱连接的线路上,减少系统弱连接线路可以优化系统分区,减小解列断面的搜索解集和搜索时间,为解列装置动作提供参考,增强解列控制的有效性。基于慢同调理论提出了改进的识别与筛选弱连接线路的方法,并将弱连接线路条数与总线路数的比值定义为弱连接系数,建立了以弱连接系数最小为优化目标的考虑解列控制的输电网双层规划模型。利用基于Boruvka算法的拓扑连通修复策略与自适应变异和惯性权重的粒子群算法相结合的混合算法,在IEEE Graver 18节点系统和华东某实际电网对上述双层模型进行求解,PSD-BPA中故障仿真结果验证了所提出的改进的弱连接筛选方法和输电网规划模型的有效性。

Splitting is an important measure to deal with power grid out-of-step oscillation.The system out-of-step cross-section is mainly distributed on the line called weak connection.Reducing the number of weak connection lines can optimize the system partition,rationally configure the splitting device,reduce the search time and solution set of the splitting cross-section,and enhance the effectiveness of the splitting control.Based on slow coherence theory,an improved method for identifying and screening weak connection lines is proposed.The ratio of the number of weak connection lines to the number of all lines is defined as the weak connection coefficient.A bi-level programming model of transmission network considering the splitting control is established with the minimum weak connection coefficient as the optimization objective.A hybrid algorithm based on Boruvka algorithm and particle swarm optimization with adaptive mutation and inertia weight is used to solve the above two-level model in an example of an 18-node IEEE Graver system and a practical power grid in East China.The fault simulation results in PSDBPA show that the weak connection screening method and transmission network planning model are effective.