在线暂态安全稳定评估的分类滚动故障筛选方法

A Classification Rolling Contingency Screening Method for On-line Transient Security and Stability Assessment

为满足在线暂态安全稳定评估对计算时间的要求,提出了基于模式和裕度估算的在线暂态安全稳定故障筛选方法。分别基于上一轮在线暂态安全稳定评估结果中各个预想故障的暂态功角稳定、暂态电压跌落安全、暂态电压稳定和暂态频率偏移安全的裕度及模式信息,并结合各个故障安全稳定模式中相关元件的潮流变化和投/退等信息,估算出新一轮在线暂态安全稳定评估所对应的运行状态下各个故障的暂态安全稳定裕度,并确定其相应的安全稳定模式,从而筛选出本轮在线暂态安全稳定评估需详细计算的预想故障子集。通过对实际电网在线数据的仿真分析,验证了所述方法的有效性和实用性。

To meet the requirement o{ calculation time for on line transient security and stability assessment, an on-line transient security and stability contingency screening method based on margin and mode estimation is proposed. According to the margin and modes information of each contingency in previous assessment results, including transient power angle stability, transient voltage security, transient voltage stability, and transient frequency security, and combining the power flow change, in service or out of service information of the relevant components associated with the security and stability modes of each contingency, the transient security and stability margin of each contingency under the new on-line transient security and stability evaluation is estimated, and the corresponding security mode is determined. Thereby, the contingency subset, which needed to be calculated in detail can be screened from the complete contingency set in the on-line transient security and stability evaluation. According to the simulation analysis of actual power network data, the validity and practicability of the proposed method can be verified.