基于功角受扰轨迹拟合的暂态稳定快速预测

基于相量测量单元（PMU）上传的功角实时量测数据，利用发电机功角受扰轨迹的分布知识，提出了一种基于功角受扰轨迹拟合的暂态稳定快速预测方法。该方法首先对系统进行离线仿真，记录发电机在受扰情况下相对于参考机的功角轨迹变化情况，并对轨迹集合进行聚类分析，从中提取特征轨迹，生成发电机的受扰轨迹标准模式库（PTSPD）;然后计算功角实时量测数据与发电机PTSPD中各个模式的欧氏距离，并利用某种修正方案来预测发电机功角的运行轨迹，从而快速判断出系统的稳定性。以新英格兰节点测试系统为例，证明了该方法的有效性和合理性。

A Novel Fast Transient Stability Prediction Method Based on Perturbed Trajectories Fitting of Rotor Angle

A novel fast method for transient stability prediction is proposed based on phasor measurement unit(PMU) measurements and perturbed trajectories fitting of rotor angle. In this method, the system is simulated off-line and rotor angle trajectories are recorded under different disturbances, and the characteristic of trajectories are extracted by cluster analysis. The perturbed trajectory standard pattern database (PTSPD) is thus obtained. The Euclidean distance between the real-time measured rotor angle trajectories and the central trajectory of one mode in PTSPD are calculated, and the rotor angle trajectories are forecasted by using a modified expression, thus transient stability is predicted quickly. Taking the New England test system for example, the effectiveness and advanced property of the presented method are proved.