Intra-Area Mode: Measurement-Based and Model-Based Assessment in Indian Power System

Inter area and Intra area modes of low frequency oscillation are inherent to any large electrical grid. Therefore, there is a need to identify and analyze these oscmations for finding the control action required for enhancing their damping. The Inter area oscillation has been studied in detail for small as well as large power system and their mitigation measures are well known. However, there is a need for more research for the Intra area oscmations in a large power system as these modes have different characteristic and may need a different strategy. This paper describes a process for identifying Intra Area mode using measurement-based oscillation identification and its model-based validation. Further, it also discusses the methods to find its characteristics and its mitigation measures with the help of an actual case study in Indian Power System.