根据量测轨迹计算多机电力系统轨迹灵敏度的新方法

A New Trajectory Sensitivity Computing Method Based on Measured Trajectories in Multi-machine Power System

轨迹灵敏度是电力系统动态安全分析的重要工具。文中提出一种多机电力系统中基于轨迹计算轨迹灵敏度的新方法。基于多机电力系统模型,构建了多机电力系统中轨迹和轨迹灵敏度之间的数学关系,提出了基于轨迹的轨迹灵敏度计算方法,仅基于轨迹之间的相互卷积即可直接计算多机系统轨迹对元件参数的灵敏度。对New England 10机39节点系统进行了仿真分析,结果验证了该方法的有效性。基于轨迹的轨迹灵敏度计算方法揭示了电力系统中轨迹灵敏度与轨迹之间的物理联系,可以避免仿真参数的误差对轨迹灵敏度计算的不利影响,为基于轨迹分析电力系统动态行为提供了新的途径。

Traj ectory sensitivity is an important tool for power system dynamic security analysis.A new traj ectory sensitivity calculating method based on traj ectories for a multi-machine power system is proposed.The mathematical relationship between traj ectory sensitivity and traj ectory in a power system is constructed based on detailed power system models,and the traj ectory sensitivity calculating method based on traj ectory is proposed,with the sensitivity of traj ectory to parameters directly obtained by the convolution of trajectories alone.The New England 10-generator 39-bus machine system simulation studies show that the proposed traj ectory sensitivity calculating method is valid.The traj ectory-based traj ectory sensitivity calculating method has revealed the physical association between the trajectory sensitivity and trajectory in power system.And the accuracy of calculating the output is independent of the validity of parameters,providing a new measure for traj ectory-based power system dynamic security assessment.