Damping Local Modes in Power Systems Using Frequency-Responsive Load Control

Abstract

 This paper explores the role of load modeling in small-signal stability analysis, focusing on the use of frequency-dependent static load (FDL) models. The study investigates the influence of FDLs on oscillation damping and the design of a locally measured power system stabilizer (PSS). A specific system configuration is considered, where the FDL is connected to the secondary bus of a step-up transformer. Both frequency domain and time domain analyses are conducted to assess the impact on system dynamics, with results demonstrated through eigenvalue evaluations and system responses to contingencies. The proposed modeling and control framework is validated using the IEEE 39-bus and 68-bus test systems, showing improved damping performance and enhanced small-signal stability.