一种基于电压轨迹特征的暂态稳定识别方法

A Transient Stability Identification Method Based on the Characteristics of Voltage Trajectory

本文提出了一种基于电压轨迹特征的暂态稳定识别方法。首先通过WAMS系统采集电力系统某一时刻中母线节点的电压信息,根据电压值是否有突变判断电力系统是否发生故障,如果发生故障,则选取电压下降最快的母线作为观测点;然后选取发电机功角差最大的两台机组,并计算观测点分别到两台机组的电气距离;最后根据观测点电压的历史数据,预测未来的电压,根据观测点的电压的最小值与电气距离的关系判断系统是否发生功角失稳。通过在电力系统模型上仿真表明,本文提出的方法可以运用于电力系统中的暂态稳定识别。

This paper proposes a transient stability identification method based on voltage trajectory features.Firstly,the WAMS system collects the voltage information of the bus node at a certain moment in the power system,and judges whether the power system is faulty according to whether the voltage value has a sudden change.If a fault occurs,the bus with the fastest voltage drop is selected as the observation point;then the generator is selected.The two units with the largest power angle difference calculate the electrical distance from the observation point to the two units.Finally,based on the historical data of the observation point voltage,the future voltage is predicted,and whether the system has a power angle instability is judged according to the relationship between the minimum value of the voltage at the observation point and the electrical distance.Simulations on the power system model show that the proposed method can be applied to transient stability identification in power systems.