Power Systems Engineering Research Center

S-88G Project Summary 

Nonlinear Analysis of Power System Oscillations using Models and Measurements (S-89G)

Summary With the growth of renewable energy sources, the transmission flow patterns are changing in power grids all over the world. Moreover, fast dynamic devices that are built into the newer power electronic based energy interfaces and advanced control systems are interacting with the traditional power grid controls in unknown ways. These complex and nonlinear dynamic mechanisms are impacting on the small-signal and transient stability properties of the power system. This project will focus on the study of nonlinear phenomena in the presence of poorly damped oscillatory modes for understanding the impact of the nonlinearities on transient stability properties. Specifically, the analysis will develop methods to distinguish between supercritical (nonlinear stable) versus subcritical (nonlinear unstable) types of oscillatory behavior. Model based simulation and bifurcation analytic studies will be used to derive insight and theoretical understanding, and the project will then extend the analysis to measurement based algorithms to the extent possible. The project will also work on speeding up time-domain ambient modal analysis methods for reducing their computational burden, and develop efficient methods for processing real-time alarms by combining the estimation results from multiple ambient and ringdown analysis algorithms.
Academic Team Members Project Leader: Vaithianathan (Mani) Venkatasubramanian (Washington State University, mani@eecs.wsu.edu)
Industry Team Members Patrick Panciatici (RTE), Florent Xavier (RTE), Gilles Torresan(RTE), and Charles Faure-Llorens (RTE)
Project Period July 16, 2019 to July 15, 2021