基于最佳灵敏度向量和差异系数的线路过载紧急控制策略

Emergency Control Strategy for Overload Circuits Based on Optimal Sensitivity Vector and Diversity Factor

为快速有效地消除线路过载,提出了一种基于最佳灵敏度向量和配对灵敏度差异系数的线路过载紧急控制策略。采用图论确定广义潮流转移区域,利用线路过载功率和热稳定功率极限确定最佳灵敏度向量。由节点灵敏度向量在最佳灵敏度向量上的投影值将过载线路所在的广义潮流转移区域内的控制节点分类并选择控制节点对。根据正常线路与过载线路的配对灵敏度向量计算差异系数,筛选确定消除过载过程中功率可能增加大的支路构成安全约束集。利用投影法选择控制节点对调节能减少调节过程需要的调整量和轮次。安全约束集线路代替全网正常线路做为正常支路约束,减少计算量同时加快紧急控制速度。IEEE39节点系统的仿真验证了本文方法的有效性。

To solve the problem of overload in circuits,this paper proposed an emergency control strategy for overload circuits based on optimal sensitivity vector and diversity factor. First,graph theory was applied to divide generalized power flow transferring zones and optimal sensitivity vector was determined by circuit overload power and thermal power limit. Then,according to the projection values of node sensitivity vector on optimal sensitivity vector,the control nodes were classified and the appropriate node pairs were selected. The control nodes were in the generalized power flow transferring zones that contain overload circuit. Finally,according to the matching sensitivity vector of normal circuits and overload circuits,difference coefficient was calculated and used to identify security constraint set which composed of branches with great power changes. The power and times of adjustment can decrease significantly by using projection method. Security constraint set works as branch constraints instead of all normal circuits,thus reducing calculation amount and improving emergency control speed. The method proposed in this paper was verified by the simulation results of IEEE39 bus system.