Reactive power reserves are important for grid stability and have a variety patterns depending on fault location as power systems become larger and complex. This paper presents the clustered effective reactive reserve (CEQR), an indicator that is suitable for identifying the risk of dynamic voltage stabitlity in terms of power system operation. This indicator provides the following features: i) It calculate the local realistic reactive reserve to recognize dynamically changing system conditions; ii)it derive clustered areas to identify valid regions for system control. The proposed method uses the sensitivity between dynamic reactive resources or load buses and a particular bus to obtain the correlation. And since this indicator is calculated using only the system topology, current and maximum outputs of the generators, there is less computational burden. This study verified the features of clustered effective reactive reserve (CEQR) by analyzing the practicable dynamic voltage collapse scenarios in the Korean electric power (KEPCO) system. In addition, as a countermeasure against the dynamic voltage collapse, the control performance of blocking tap changer scheme using the proposed indicator is described.

中文翻译：

---

聚集有效无功储备以确保电力系统运行中的动态电压稳定性

无功功率储备对于电网稳定性很重要，并且随着电力系统变得越来越大和越来越复杂，其无故障模式取决于故障位置。本文提出了集群有效无功储备（CEQR），该指标适用于识别电力系统运行中动态电压稳定性的风险。该指标具有以下特征：i）计算局部实际无功储备以识别动态变化的系统条件；ii）得出聚类区域，以标识有效区域以进行系统控制。所提出的方法利用动态无功资源或负载母线与特定母线之间的灵敏度来获得相关性。而且由于该指标仅使用系统拓扑，发电机的电流和最大输出来计算，计算负担较小。这项研究通过分析韩国电力（KEPCO）系统中可行的动态电压崩溃情景，验证了群集有效无功储备（CEQR）的功能。另外，作为针对动态电压崩溃的对策，描述了使用提出的指示器的分接开关变换器方案的控制性能。