融合轨迹预测技术的输电线路新型自适应重合闸

A New Type of Adaptive Reclosing Merged With Trajectory Prediction for Transmission Lines

输电线路故障的重合闸时刻对系统的暂态稳定有很重要的影响。针对目前最佳重合时刻难以在线确定的问题,提出融合轨迹预测技术的重合时刻在线捕捉方法。核心是利用机组功角的轨迹预测信息,确定系统振荡机组的主导模式,并按主导模式对机组进行分群,将多机系统复杂的暂态稳定性问题转化为对应的单机无穷大系统的功角稳定性分析,选其单机无穷大系统(one machine infinite bus,OMIB)映像的前3摆的平均稳定裕度作为确定最佳重合时刻的指标。由于映像系统功角的幅值与稳定裕度成反比,因此给出实用判据:最佳重合时刻满足的条件为OMIB映像的前3摆功角幅度均值最小。最后给出了完整的设计方案。

The reclosing moment for faulty transmission line greatly influences transient stability of power system.In allusion to the difficulty of online determination of the optimal reclosing moment,a method of online seizing on the reclosing moment,in which the trajectory prediction technology is merged with,is proposed.The core of the proposed method is to determine the dominant mode of oscillatory generation units by use of their trajectory prediction information of units’ power angles and the units are divided into groups according to the dominant mode,thus the complex power system transient stability problem is turned into corresponding power angle stability analysis of one machine infinitive bus（OMIB） system,and the average stability margin of the first three swings of OMIB system mapping is chosen as the index to determine optimal reclosing moment.Because the amplitude of power angle in system mapping is inversely proportional to stability margin,so a practicable criterion is given as following： the minimum of the average power angle amplitudes of the first three swings of OMIB system mapping is the very condition satisfying the optimal reclosing moment.Finally,a complete design scheme for the proposed method is given.