An Analytical Approach for the Determination of Regions with Maximum RoCoF

Abstract

Maintaining the frequency is a relevant challenge in the field of power systems due to the continuous shift from conventional synchronous generation to converter-based generation, and the rate of change of frequency (RoCoF) plays a vital role in it. This paper proposes an analytical approach to determine the regions with maximum RoCoF for disturbances in the lowest inertia areas of the power system. The method is based on analyzing different system characteristics like inertia, electrical distance and power deviation, which affect the RoCoF, and thereby determine the overall contribution of these factors to the magnitude of the RoCoF. A correlation-regression based strategy is employed to determine an analytical expression that accurately specifies the regions of the IEEE 68 bus system with the highest RoCoFs. The expression obtained is also validated with the results from IEEE 39 bus system.