电力系统暂态稳定计算的在线应用

暂态稳定计算中直接法计算速度快，能对暂态稳定进行定量分析，但是在模型的详细程度、准确度和可靠性方面都无法和时域仿真法相比，而时域仿真法由于考虑较复杂的模型，计算时间较长。文章首先应用快速暂态计算求取系统暂态稳定裕度，对系统故障进行排序，对筛选出的故障做考虑复杂模型的时域仿真法校验计算，从而实现了在线稳定分析。文中所论述的在线稳定计算方法在甘肃电网中得到了应用，取得了较好的效果，同时对实际电网中出现的问题，在方法上进行了改进，增强了方法的实用性。

Online Application of Power System Transient Stability Computation

Although potential energy boundary surface (PEBS) method can calculate power system transient stability with high speed and make quantitative analysis of transient stability, PEBS method is not as good as time-domain simulation method evidently in aspects of detailed extent, accuracy and reliability of models, however in time-domain simulation method the more complex mathematical model should be considered, so its calculation speed is slower. According to the advantages and defects as well as the applicability of both transient stability calculation methods, an approach to online application of transient stability calculation is proposed: firstly by use of PEBS method the margin of transient stability is calculated; secondly, based on the obtained stability margins corresponding to the severity of faults, the faults are ordered; thirdly, by use of complex model the obtained calculation results are verified by time-domain simulation method, thus online stability analysis is implemented. Above-mentioned approach is successfully applied in Gansu Power Grid, at the same time the proposed approach is improved according to the actual conditions of Gansu Power Grid and its applicability is enhanced.