Background and activities
Starting in 2014 and after 11 years of working on the stability of power electronics systems, I have gradually expanded my research area into non-linear and non-stationary signal analysis, from the domain of harmonics in power systems into the domain of biological systems. For that purpose, my group is now developing generic platforms for non-linear and non-stationary signals analysis suitable for both physical and biological systems (signals from complex electrical grids and EEG signals from the brain). The initial steps of this research were demonstrated through the translation of brain signals into commands for the actuation of drones resorting to capturing the motor imagery signals from the scalp, as shown in this NRK video. The long-term goal of the research is to contribute with a better understanding of the properties of electrical signals in the following two domains:
1. The brain electrical signals: to better understand the mechanism of cognitive functions to advance our ability to inteface technology with biological environments in order to:
Identify new biomarkers from EEG signals and open entire new fields for disease preventioin and early therapeutic interventions
Revolutionize industrial domains such as authetication and access control systems, subject and sex identification, brain contolled appliances for home automation and continuous monitoring of high-risk population (elderly)
2. The electricity grid: that is undergoing changes in the periodic nature of their signals due to the complexification in its topologies in conjunction with new non-linear components being introduced in large numbers
In particular, I am interested in understanding the mechanism of synchronisation in these two different worlds. I am project manager for the David & Goliath project.
Some of our group most exciting experiments are described in this link.
- Professor in Industrial Electrotechnics and electrical signal analysis at the Department of Engineering Cybernetics (NTNU) since 2014.
- Professor in Power Electronics for Power Systems at the Department of Electrical Engineering (NTNU), 2008-2014.
- Affiliated Scientist at AMOS Center of Excellence since 2016.
- Dr. Eng., Tokyo Institute of Technology, Japan, 2000. Thesis topic: "Power System Stability Control based on Phase Angle Regulation".
- Master of Engineering, University of the Ryukyus, Japan, 1997. Thesis topic: "Enhancement of Power System Stability based on the Application of Series Capacitors".
Current PhD students and Postdocs:
- Luis Alfredo Moctezuma (2018-2021): EEG-based Signal Analysis: A Study from High-denisty EEG to Low-density EEG (PhD).
- Andres Soler Guevara (2018-2021): EEG based Brain Mapping and Signal Analysis: A study of low density EEG to source activity reconstruction and applications in BCI (PhD), with the co-supervision of Eduardo Giraldo.
- Erwin H. T. Shad (2018-2021): Low Impedance Active Dry Electrode for Low-density EEG Signal Acquisition (PhD), with the co-supervision of Trond Ytterdal.
- Lena Spitthoff (2019-2023): Ageing Modelling of Secondary Li-ion Batteries. Co-supervisor with Odne Stokke Burheim at the Department of Energy and Process Engineering.
- Jing Li (2018-2019): Stability between the Locomotive and Traction Network based on the Impedance Method (visiting PhD from Beijing Jiatong University).
- Chen Zhang (2018-2020): Autonomous Control of Stability in Wind Farms and Smart Grids (NTNU Energy Postdoc).
- Alejandro Torres Garcia (2019-2020): Augmented Human: actuation of devices with biological signals (ERCIM Postdoc)
- Bing Tian (2018-2020): All-electronic control for Subsea Production System (Research Council of Norway Postdoc)
Graduated PhDs and Postdocs, main supervision:
- Atle Rygg (2015-2018): Impedance-based Methods for Small-signal Analysis of Power Electronics Dominated Systems.
- Mohammad Amin (2013-2017): Small-signal Stability Characterization of Interaction Phenomena between HVDC System and Wind Farms.
- Paula Garcia-Rosa (2016-2017): Hilbert-Huang transform (HHT)-based estimation of the instantaneous frequency of sea waves for wave energy control purposes (Postdoc).
- Jinghong Liu (2017-2018): Modeling and Stability Analysis of Digitally Controlled Grid-Connected Power Electronics Systems (visiting PhD).
- Mehdi Zadeh (2011-2015): Stability Analysis Methods and Tools for Power Electronics- Based DC Distribution Systems, Applicable to On-Board Electric Power Systems and Smart Microgrids.
- Santiago Sanchez (2011-2015): Stability Investigation of Power Electronics Systems: A Microgrid Case.
- Gilbert Bergna-Diaz (2012-2015): Modular Multilevel Converter Control for HVDC Operation: Optimal Shaping of the Circulating Current Signal for Internal Energy Regulation (PhD in Cotutelle with Supelec).
- Rene Barrera Cardenas (2011-2015): Meta-parametrised meta-modelling approach for optimal design of power electronics conversion systems: Application to offshore wind energy.
- Jonas Bakken (2011-2015): Marine renewable energy conversion: Grid and off-grid modeling, design and operation.
- Natalie Holtsmark (2010-2014): Investigation of the Matrix Converter in a DC Series-Connected Wind Farm: Modulation, Control and Efficiency.
- Nadeem Jelani (2010-2014): Investigating the Role of Active Loads in the Future Electrical Grid Dominated by Power Electronics.
- Muhammad Jafar (2008-2012): Transformer-Less Series Compensation of Line-Commutated Converters for Integration of Offshore Wind Power.
- Alejandro Garces (2008-2012): Design, Operation and Control of Series-Connected Power Converters for Offshore Wind Parks.
- Maximiliano Bueno-Lopez (2017-2018): Hilbert Huang Transform for EEG Signal Analysis and Power Quality in systems with High-PV penetration (ERCIM Postdoc).
- Noe Barrera Gallegos (2017-2018): Synchronization Properties of Voltage Source Converters when seen as Coupled Oscillators (ERCIM Postdoc).
- Jing Lyu (2016-2017): Development of general system-level methodology and tools to analyze and predict the instability of AC power electronics systems (ERCIM Postdoc).
- Elisabetta Tedeschi (2009-2011): Design and Control of Energy Conversion Systems for the Integration of Offshore Renewable Energy Sources into the Electric Grid (Postdoc).
Graduated PhDs, co-supervision:
- Espen Skjong (2014-2017): Optimization-based Control in Shipboard Electric Systems, co-supervised with Tor Arne Johansen.
- Raymundo Torres-Olguin (2009-2013): Grid Integration of Offshore Wind Farms using Hybrid HVDC Transmission: Control and Operational Characteristics, co-supervised with Tore Undeland.
- Steinar Danielsen (2007-2010): Electric Traction Power System Stability: Low-frequency interaction between advanced rail vehicles and a rotary frequency converter, co-supervised with Olav Bjarte Fosso.
Scientific, academic and artistic work
A selection of recent journal publications, artistic productions, books, including book and report excerpts. See all publications in the database
- (2019) A Gray-Box Method for Stability and Controller Parameter Estimation in HVDC-Connected Wind Farms Based on Nonparametric Impedance. IEEE transactions on industrial electronics (1982. Print). vol. 63 (3).
- (2019) Optimal Shaping of the MMC Circulating Currents for Preventing AC-side Power Oscillations from Propagating into HVDC Grids. IEEE Journal of Emerging and Selected Topics in Power Electronics.
- (2019) The Mode Mixing Problem and its Influence in the Neural Activity Reconstruction. IAENG International Journal of Computer Science.
- (2019) Distributed control architecture for real-time model predictive control for system-level harmonic mitigation in power systems. ISA transactions.
- (2019) Extremum-Seeking Control for Harmonic Mitigation in Electrical Grids of Marine Vessels. IEEE transactions on industrial electronics (1982. Print). vol. 66 (1).
- (2019) Harmonic State-Space Based Small-Signal Impedance Modeling of a Modular Multilevel Converter With Consideration of Internal Harmonic Dynamics. IEEE transactions on power electronics. vol. 34 (3).
- (2019) Electroencephalographic Source Localization based on Enhanced Empirical Mode Decomposition. IAENG International Journal of Computer Science. vol. 46 (3).
- (2019) Subject Identification from Low-Density EEG-Recordings of Resting-States: A Study of Feature Extraction and Classification. Lecture Notes in Networks and Systems. vol. 70.
- (2019) Guest Editorial: Oscillations in Power Systems with High Penetration of Renewable Power Generations. IET Renewable Power Generation. vol. 13 (1).
- (2019) Frequency Domain Modelling and Stability Analysis of a DFIG-based Wind Energy Conversion System Under None-compensated AC Grids: ImpedanceModelling Effects and Consequences on Stability. IET Power Electronics.
- (2018) Optimal Sizing of Energy Storage Systems for Shipboard Applications. IEEE transactions on energy conversion.
- (2018) A meta-parameterized approach for the evaluation of semiconductor technologies - A comparison between SiC-MOSFET and Si-IGBT technologies-. IEEJ Journal of Industry Applications. vol. 7 (3).
- (2018) The impact of time-frequency estimation methods on the performance of wave energy converters under passive and reactive control. IEEE Transactions on Sustainable Energy.
- (2018) Damping region extension for digitally controlled LCL-type grid-connected inverter with capacitor-current feedback. IET Power Electronics. vol. 11 (12).
- (2018) Harmonic State-Space Based Small-Signal Impedance Modeling of Modular Multilevel Converter with Consideration of Internal Harmonic Dynamics. IEEE transactions on power electronics. vol. 1.
- (2018) Localization of Active Brain Sources From EEG Signals Using Empirical Mode Decomposition: A Comparative Study. Frontiers in Integrative Neuroscience. vol. 12.
- (2018) Time-Frequency analysis for nonlinear and non-stationary signals using HHT: A mode mixing separation technique. IEEE Latin America Transactions. vol. 16 (4).
- (2018) On the Impedance Modeling and Equivalence of AC/DC Side Stability Analysis of a Grid-tied Type-IV Wind Turbine System. IEEE transactions on energy conversion.
- (2017) Small-Signal Stability Assessment of Power Electronics based Power Systems: A Discussion of Impedance- and Eigenvalue-based Methods. IEEE transactions on industry applications. vol. 53 (5).
- (2017) Understanding the origin of oscillatory phenomena observed between wind farms and HVDC systems. IEEE Journal of Emerging and Selected Topics in Power Electronics. vol. 5 (1).