Friday 26th March at 9:30 via Microsoft Teams following this link
Speakers: Prof. M. Paolone, Dr. A. Derviškadić, Dr. G. Frigo and A. Karpilow
Abstract – Power systems are rapidly evolving towards low-inertia networks and system operators are facing new challenges to operate their grids safely. Specifically, they are facing a significant increase in renewable energy sources and inverter-connected devices that, as such, do not provide any inertia. This loss of mechanical rotational inertia, inherent in synchronous generators, which is key in absorbing first-instants power imbalances, increases the likelihood of extreme and frequent variations in the AC voltage and current signals. Consequently, power grid signal processing and modelling techniques relying on the well-known phasor model, and the assumption of quasi-stationarity, may no longer be valid. Specifically, electromechanical transients which result in signal dynamics that have continuous broadband frequency spectra are insufficiently captured by the narrowband and discrete phasor representation. To address this concern, the seminar discusses cases where phasor-based analysis has been proven to be inadequate, justifying the search for alternative methods. Several approaches that allow for more rigorous representations of signal dynamics are discussed, including dynamic phasor representation techniques and a dictionary analysis method that integrates the Hilbert Transform and analytic signal models. The performance of these methods are discussed by comparing them to conventional phasor-based analysis during non-stationary conditions.
Mario Paolone received the M.Sc. (Hons.) and Ph.D. degrees in electrical engineering from the University of Bologna, Italy, in 1998 and 2002. In 2005, he was an Assistant Professor in power systems with the University of Bologna, where he was with the Power Systems Laboratory until 2011. Since 2011, he has been with the Swiss Federal Institute of Technology, Lausanne, Switzerland, where he is currently a Full Professor and the Chair of the Distributed Electrical Systems Laboratory. His research interests focus on power systems with particular reference to real-time monitoring and operational aspects, power system protections, dynamics and transients. Dr. Paolone has authored or co-authored over 300 papers published in mainstream journals and international conferences in the area of energy and power systems that received numerous awards including the IEEE EMC Technical Achievement Award, two IEEE Transactions on EMC best paper awards, the IEEE Power System Dynamic Performance Committee’s prize paper award and the Basil Papadias best paper award at the 2013 IEEE PowerTech. Dr. Paolone was the founder Editor-in-Chief of the Elsevier journal Sustainable Energy, Grids and Networks.
Asja Derviškadić received the B.Sc. and M.Sc. degrees (Hons.) in electrical engineering from the University of Rome “La Sapienza,” Rome, Italy, in 2012 and 2015, respectively, and the Ph.D. degree in electrical engineering from the Swiss Federal Institute of Technology of Lausanne (EPFL), Lausanne, Switzerland, in 2019. In 2019-2020 she was a Postdoctoral researcher at the Distributed Electrical Systems Laboratory (DESL) of EPFL and her research interests focused on synchronized sensing technologies for wide-area situational awareness of electrical grids operating in non-stationary conditions. She is currently with the short-term network modeling team of Swissgrid, the Swiss transmission system operator, where she works as grid studies engineer.
Guglielmo Frigo was born in Padua, Italy, in 1986. He received the B.Sc. and M.Sc. degrees in biomedical engineering from the University of Padova in 2008 and 2011, respectively, and the Ph.D. degree from the School of Information Engineering in 2015, with a dissertation about compressive sensing (CS) theory applications to instrumentation and measurement scenario. He served as PostDoc researcher at the Electronic Measurement Research Group, University of Padova (2015-2017), and at the Distributed Electrical Laboratory, Swiss Federal Institute of Technology of Lausanne (2018-2020). In 2020 he was foreign guest researcher at NIST, Gaithersburg, USA, and he is currently scientist at METAS, Wabern, Switzerland, where he is responsible of IED and PMU calibration services. His current research interests include the development of enhanced measurement infrastructures for electrical systems, and the metrological definition of electrical quantities in the DC-150 kHz range.
Alexandra Karpilow received the B.S.c in mechanical engineering from the University of Colorado, Boulder, U.S., in 2016, and the M.Sc. degree in electrical engineering from the Swiss Federal Institute of Technology of Lausanne (EPFL), Lausanne, Switzerland, in 2019. She is currently pursuing her Ph.D. degree in electrical engineering at EPFL in the Distributed Electrical Systems Laboratory (DESL) with a focus on signal analysis and modeling of power grid during non-stationary conditions.