Taxonomy of coherency detection and coherency-based methods for generators grouping and power system partitioning

In a bulk power system, generators can be divided into groups based on the variation of their swing curves after disturbance occurrence. In this regard, generators that have the same variations are placed in the same group and are called 'coherent'. Identifying coherent generators is an important step in creating a reduced model of bulk power systems for dynamic wide-area analysis. The aim of this study is to provide a comprehensive and up-to-date bibliographic review of the literature related to coherency detection and power system partitioning after disturbance occurrence. In this study, coherency detection methods are classified into model-based and measurement-based categories. Furthermore, existing methods for power system partitioning based on coherency concept are also reviewed and categorised using two different criteria. Finally, the future trend toward coherency and coherent areas detection is discussed.