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Data-Driven Analysis of Power System Dynamic Performances Based on Nonlinear Koopman Modes

Many methods for analysis of power system dynamic performances such as stability have been developed. The traditional methods are mainly model-based, that is, investigating a mathematical model that represents the target dynamic performances of a power system. In contrast to the model-based approach, it is of practical importance to develop methods that indicate spatio-temporal features of dynamics from measured data. In fact, SCADA system continuously collect information on the system’s state, and recent advance of real-time PMUs offers an advanced data collection method. In this talk, I will outline our efforts to develop data-driven methodology and tools for analysis of power system dynamic performances. The development is based on the so-called Koopman operator---a linear, infinite-dimensional operator that is defined for arbitrary nonlinear dynamical systems and contains full information of the systems. Modes derived through point spectrum of the Koopman operator, referred to as Koopman Modes (KMs), provide a nonlinear extension of linear oscillatory modes. First, we will show an approach to stability assessment by applying the KM analysis to measured physical power flow data. Second, we will present a technique for identification of coherent swings and machines based on the KM analysis. Throughout this talk, I will describe how the Koopman operator formalism is crucial to our development in power system analysis. The contents of this talk are joint work with Professor Igor Mezic (UC Santa Barbara).

Type of Seminar:
IfA Seminar
Prof. Yoshihiko Susuki
Department of Electrical Engineering, Kyoto University / JST-CREST
Sep 16, 2014   11:15

LFV E 41, Schmelzbergstrasse 7
Contact Person:

Prof. Florian Dörfler
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Biographical Sketch:
He received his bachelor, master, and Ph.D. degrees, all in engineering from Kyoto University, Japan in 2000, 2002, and 2005, respectively. In 2005, he joined the Department of Electrical Engineering at Kyoto University, where he is currently a Lecturer. In 2008-2010, he was a Visiting Researcher at the Department of Mechanical Engineering, University of California, Santa Barbara, United States under JSPS Postdoctoral Fellowship for Research Abroad. His research interests are in applied nonlinear dynamics, power and energy systems technology, and control applications. He is a member of IEEE, SIAM, and so on.