考虑柔性直流落点约束的最优主动解列断面搜索算法

当电力系统遭受严重扰动后,主动解列策略是防止灾害性大停电事故积极而有效的手段,其核心内容是搜索最优解列断面,通常理解为是一种含约束的组合优化问题。提出了一种基于谱聚类的考虑柔性直流落点约束的最优主动解列断面搜索算法,该方法通过谱聚类算法将电力系统的最优解列断面搜索问题映射为图的分割问题进行求解,直接求取最优解且计算速度较快;以最小有功潮流冲击为目标函数,最小化解列后系统潮流的改变提高了孤岛系统的暂态稳定性;考虑了基于电压源换流器的高压直流输电(VSC-HVDC)的终端落点作为约束条件,将VSC-HVDC的终端置于不同孤岛内可实现孤岛间功率的交换,降低了系统整体恢复稳定的成本。最后通过IEEE 10机39节点系统以及厦门系统实际算例的仿真验证,证明了该方法的有效性和快速性。

A Searching Algorithm for Optimal Controlled Islanding Surfaces Considering VSC-HVDC Terminal Constraint

The controlled partitioning strategy is an active and effective way of avoiding catastrophic wide area blackouts after severe disturbance.The main content is searching optimal controlled islanding surfaces,it is usually considered as a constrained combinatorial optimization problem.This paper presents a searching algorithm for controlled islanding surfaces considering VSC-HVDC terminal constraint that based on spectral clustering,this method has the following characteristics:the problem of searching for controlled islanding surfaces in real power system is mapped to the graph partitioning problem by applying spectral clustering,which the optimal solution is obtained directly and the calculation speed is fast;the use of minimal power-flow disruption as the objective function creates islands with the minimum change from the predisturbance power-flow pattern,this property of the objective function improves the transient stability of the islands;it considers voltage source converter-based HVDC (VSC-HVDC) links within a synchronous system and places the VSC-HVDC terminal in each island so that power can be exchanged between the islands.This limits load shedding and generator tripping and reduces the overall restoration costs.Finally,the effectiveness and rapidity of the proposed method are validated by simulation results of IEEE 10 machine 39 bus system and actual Xiamen power system.