计及源-荷功率波动性的静态电压稳定故障快速筛选和排序方法

为有效分析新能源发电与负荷的随机波动下设备故障对电压稳定性的影响，基于局部电压稳定指标(L指标)提出了一种计及源-荷功率波动性的静态电压稳定故障快速筛选和排序方法。首先，推导了L指标及其变量的全微分方程，进而给出了系统网络拓扑结构和节点注入功率变化时L指标的线性化计算公式；其次，选取基准运行方式进行潮流计算获得初始状态值，并提出采用带校正的线性化方法计算各预想事故下的L指标进而筛选得到严重故障集；然后，结合新能源与负荷功率曲线值与基准运行点的偏差，计算严重故障集内的L指标并进行故障的时段排序；最后，综合比较时序分析结果得到最终的故障排序。算例结果验证了所提方法的可行性和有效性，与现有方法相比可以在保证故障排序结果准确度前提下显著提升计算效率，对含新能源电力系统静态电压稳定故障快速筛选和排序具有一定参考和借鉴意义。

A Fast Static Voltage Stability Contingency Screening and Ranking Method Considering Source-Load Power Fluctuation

In order to effectively analyze the influence of equipment failure on voltage stability under the random fluctuation of new energy power generation and load, a fast static voltage stability contingency screening and ranking method considering source-load power fluctuation is proposed based on the local voltage stability index (L index). Firstly, the linearized calculation formula of L index under the change of system network topology and node injection power is given based on the related total differential equation deduced; secondly, the reference operation mode is selected for power flow calculation to obtain the initial value, and a linearized method with correction is proposed to calculate the L index under each expected accident to obtain the serious fault set; and then, based on the deviation of the renewable energy and load power curve value from the benchmark operating point, the L index in the serious fault set is calculated and the time-series ranking is performed; finally, the ultimate contingency ranking is obtained by comprehensively comparing the time-series analysis results. Case studies have verified the feasibility and effectiveness of the proposed method. Compared with the existing methods, its calculation efficiency can be significantly improved under the premise of ensured accuracy of fault sorting results, which can provide a reference for static voltage stability contingency screening and ranking in power system with renewable energy.