Vokas Georgios

Discipline: Power Electronics and their Applications on Renewable Energy Control Systems

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Studies

1995 – PhD in RES, Quality & Power Electronics, Electric Power Sector, School of Electrical and Computer Engineering,
           National Technical University of Athens (NTUA), Greece.

1990 – Diploma of Electrical Engineer, School of Electrical and Computer Engineering,
           National Technical University of Athens (NTUA), Greece.

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Research Interests

• SMART GRIDS & OPTIMIZATION SCHEMES FOR ENERGY PLANNING USING RENEWABLE ENERGY SOURCES (RES)
• CIRCULAR ECONOMY AND RATIONAL USE OF ENERGY IN INDUSTRY AND BUILDING SECTOR
• ENERGY STORAGE IN SMART GRIDS FOR HIGH RES PENETRATION
• ELECTROMOBILITY WITH RES AND INDUCTION CHARGING
• POWER QUALITY OF ELECTRIC POWER SYSTEMS
• ENERGY STRATEGIES AND ENVIRONMENTAL ISSUES USING RES
• WAYS FOR INCREASING THE EFFICIENCY (PR OPTIMIZATION) OF PV PARKS
• MEASURING ELECTRICAL CHARACTERISTICS OF GRID CONNECTED PV SYSTEMS
• FEASIBILITY STUDY, ENERGY MANAGEMENT  &  DESIGN OF LARGE SCALE PV PARKS
• DESIGN & CONSTRUCTION OF 3-PHASE 6-PULSE CONTROLLED  RECTIFIERS / INVERTERS
• EXPERIMENTAL SIMULATION OF PV STATIONS USING POWER ELECTRONIC CIRCUITS

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Representative Publications

    Α. International Journals

• G.A. Vokas, A.V. Machias, “Harmonic voltages and currents on two Greek islands with Photovoltaic stations: Study and Field Measurements”, IEEE Trans. on Energy Conversion, Vol. 10, No.2, June 1995.
• F.V.Topalis, I.F.Gonos, G.A. Vokas, “Arbitrary waveform generator for harmonic distortion tests on compact fluorescent lamps”, Measurement, Journal of the International Measurement Confederation, Elsevier, London U.K.,Vol 30(4), pp 257-267, December 2001.
• P.N. Korovesis, G.A. Vokas, I.F. Gonos, F.V. Topalis, “Influence of large scale Installation of energy saving lamps on the line voltage distortion of a weak network supplied by photovoltaic station”, IEEE Transactions on Power Delivery, Vol. 19, No4, October 2004.
• G.A. Vokas, N. Christantonis, F. Skitides, “Hybrid Photovoltaic-Thermal Systems for domestic Heating and Cooling – A theoretical approach”, Solar Energy-Elsevier, pp. 607-615, Vol. 80, 2006.
• E.Paraskevadaki, S.Papathanasiou, G.A.Vokas, “Effects of partial shading on the PV module characteristic curves”, Materials Science Forum, Vol. 670, pp 391-398, 2010.
• Georgios A. Vokas, Panagiotis G. Klironomos, John K. Kaldellis, “Evaluation of Building Integrated Photovoltaic Systems’ Potential in the Industrial Sector: Case Study Oinofyta-Viotia Zone”, Journal of Energy and Power Engineering ISSN 1934-8975, USA JEPE13010604, December 2013.
• K.Kontogiannis, G.Vokas, S.Papathanasiou, S.Nanou, “Power Quality Field Measurements on PV inverters”, International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (IJAREEIE), October 2013.
• G.A. Vokas, K. Lagogiannis, “PV Energy Production Over Greece: Comparison of Predicted and Measured Data of Medium-Scale Photovoltaic Parks”, International Journal of Engineering Research & Technology (IJERT), ISSN: 2278 – 0181, October 2013.
• P. Papageorgas, D. Piromalis, K. Antonakoglou, G. Vokas, D. Tseles and K. Arvanitis, “Smart Solar Panels: In-situ monitoring of photovoltaic panels based on wired and wireless sensor networks”, Elsevier ISSN: 1876-6102, Energy Procedia, Volume 36, Pages 535-545, 2013.
• D. Zafirakis, C. Elmasides, D. Sauer, M. Leuthhold, G. Merei, J.K. Kaldellis, G.A. Vokas, “The multiple role of energy storage in the industrial sector: Evidence from a Greek industrial facility”, Elsevier ISSN: 1876-6102, Energy Procedia, Volume 46, Pages 178-185, 2014.
• V. Güngör, G. Tuna, S. Potirakis, G.A. Vokas, “Smart Grid”, WILEY Encyclopedia of Electrical and Electronics Engineering, doi: 10.1002/047134608X.W8269, June 2015.
• T. Raptis, G.A. Vokas, P. Langouranis, S. Kaminaris, “Total Power Quality Index for Electrical Networks Using Neural Networks”, Energy Procedia, Elsevier ISSN: 1876-6102, Volume 74, pp. 1499-1507, August 2015.
• G.A. Vokas, P.A. Langouranis, P.A. Kontaxis, F.V. Topalis, “Analysis of power quality field measurements and considerations on the power quality standard”, Journal of Applied Research Review (JARR), Vol.1, No.1, 2015.
• E.I. Batzelis, K. Samaras, G. Vokas and S. Papathanassiou, “Off-grid inverter faults: diagnosis, symptoms and cause of failure,” Mater. Science. Forum, vol. 856, pp. 315-321, Feb. 2016.
• A. Anastasiadis, G. Kondylis, G.A. Vokas, P. Papageorgas, “Hydrothermal Coordination in power systems with large-scale integration of renewable energy sources”, Management of Environmental Quality: An International Journal Volume 27 Issue: 3, pp.246-258, 2016.
• A.G.Anastasiadis, S.A.Konstantinopoulos, G.P.Kondylis, G.A. Vokas, P. Papageorgas, “Effect of fuel cell units in economic and environmental dispatch of a Microgrid with penetration of photovoltaic and micro turbine units”, International Journal of Hydrogen Energy Elsevier, ISSN: 0360-3199, Volume 42, Issue 5, Pages 3479-3486, February 2017.
• A.G.Anastasiadis, S.A.Konstantinopoulos, G.P.Kondylis, G.A. Vokas, “Electric Vehicle Charging in Stochastic Smart Microgrid Operation with Fuel Cell and RES units”, International Journal of Hydrogen Energy, Elsevier ISSN: 0360-3199, Vol. 42, Issue 12, pp 8242-8254, March 2017.
• Jean Zaraket, Toni Khalil, Michel Aillerie, G. A. Vokas, Chafic Salame, “The Effect of Electrical stress under temperature in the characteristics of PV Solar Modules”, Energy Procedia, Elsevier ISSN: 1876-6102, Volume 119, Pages 579-601, July 2017.
• A.G.Anastasiadis, G.A. Vokas, S.A. Konstantinopoulos, G.P. Kondylis, Chafic Salame, A. Polyzakis, K.Tsatsakis, “Wind Generation and Electric Vehicles coordination in Microgrids for Peak Shaving purposes”, Energy Procedia, Elsevier ISSN: 1876-6102, Volume 119, Pages 407-416, July 2017.
• E.A. Samiotis, D.T. Trigonidis, G.A. Vokas, P. Papageorgas, A.G. Anastasiadis, “Simulation and Implementation of a SPWM Inverter Pulse Generator Circuit for Educational Purposes”, Energy Procedia, Elsevier ISSN: 1876-6102, Vol. 157, January 2019, Pages 594–601.
• G.A. Vokas, A.G. Anastasiadis, G.P. Kondylis, and A. Polyzakis, “Effects of different Charging and Discharging Strategies of Electric Vehicles under various Pricing Policies in a Smart Microgrid”, “Progress in Industrial Ecology, An International Journal”, Vol13, Issue2, pp. 144-162, Jan 2019.
• Anastasiadis A., Vokas G. “Economic Benefits of Smart Microgrids with Penetration of DER and mCHP Units for Non-Interconnected Islands”, Renewable Energy – Elsevier, ISSN: 1879-0682 Volume 142, Pages 478-486, November 2019.
• G. Deiktas, A.G.Anastasiadis, G.A.Vokas, “Economic investigation of a Vanadium Redox BESS for the exploitation of wind power rejections in an isolated Greek Island”, Elsevier – Energy Reports 6, pages 367–379, November 2020.
• G.J. Tsekouras, P.M. Deligianni, G.A. Vokas, A.X. Moronis, C.D. Tsirekis, A.D. Salis, C.N. Bolakis, “An Optimal Design of a Small Photovoltaic Plant with Cost Minimization based on a Real Database of PV Panels and Inverters”, WSEAS Transactions on Circuits and Systems, Volume 20, 2021.
• D.K. Alexopoulos, A.G. Anastasiadis, G.A. Vokas, S.D. Kaminaris, C.S. Psomopoulos, “A review of flexibility options for high RES penetration in power systems—Focusing the Greek case”, Energy Reports, ELSEVIER, Vol. 7 Suppl.5, pp 33–50, 2021.

    Β. International Conferences

    (Representative Publications with students)

• P.A. Langouranis, S.D. Kaminaris, G.A. Vokas, T.E. Raptis, G.Ch. Ioannidis, “Fuzzy Total Power Quality Index for Electric Networks”, 9th Mediterranean Conference on Power Generation, Transmission Distribution and Energy Conversion MEDPOWER 2014; 11/2014.
• G.E. Tsokolas, G.A. Vokas, “Functional characteristics of a typical grid photovoltaic system with various topologies and inverter types”, 9th Mediterranean Conference on Power Generation, Transmission Distribution and Energy Conversion MEDPOWER 2014; 11/2014.
• A.G.Theodorakis, G.A.Vokas, P.Fergadiotis, Basic operating principles and pilot prototype development of a medium scale induction heating machine”, 10th Mediterranean Conference on Power Generation, Transmission, Distribution and Energy Conversion (MEDPOWER), 6 – 9 November 2016, Belgrade, Serbia.
• M. Palivos, G.A.Vokas, A. Anastassiadis, P. Papageorgas and C. Salame, ”Comparison study of the technical characteristics and financial analysis of electric battery storage systems for residential use”, American Institute of Physics (AIP) Conference Proceedings, , 2018.
• K. Agavanakis, P. Papageorgas, G.A. Vokas and D. Ampatis, “Εnergy trading market evolution to the Energy Internet- A feasibility review on the enabling IoT cloud technologies”, American Institute of Physics (AIP) Conference Proceedings, 2018.
• Korakianitis, N., Vokas, G.A., Ioannides, G., “Review of wireless power transfer (WPT) on electric vehicles (EVs) charging”, American Institute of Physics (AIP) Conference Proceedings, 2019.
• Koutsouvelis, D., Vokas, G.A., “Lithium batteries: Storage applications and methods to improve efficiency”, American Institute of Physics (AIP) Conference Proceedings, 2019.
• Giannopoulos, N., Ioannidis, G.C., Vokas, G.A., Psomopoulos, C.S., “Current balancing techniques of parallel-connected silicon carbide MOSFETs: A review” , American Institute of Physics (AIP) Conference Proceedings, 2019.
• Petratos, S.A., Ioannidis, G.C., Kaminaris, S.D., Vokas, G.A., “Comparative evaluation of a fuzzy logic controller for speed control of DC motor applying different optimization techniques”, American Institute of Physics (AIP) Conference Proceedings, 2019 .
• D.Ch. Koutsouvelis, G.A. Vokas, G.Ch. Ioannidis, “Cell Balancing using a Modified CUK Converter”, MEDPOWER – Mediterranean Conf. on Power Generation, Transmission, Distribution & Energy Conversion, 9-12 November 2020.

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Undergraduate Courses

• Power Electronics I (6^th semester)
• Power Electronics II (7^th semester)
• Energy Storage (7^th semester)
• Renewable Energy Sources Ι (7^th semester)
• Renewable Energy Sources II (8^th semester)
• Smart Energy Grids & Distributed Generation (9^th semester)

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Postgraduate Courses

• Msc “By research in Electrical and Electronic Engineering”:  “Power Electronic Applications for Advanced Control and Power Quality”, School of Electrical and Electronic Engineering, University of West Attica (UNIWA).
• «MSc in Energy»: «Electric Power Systems & Power Electronics» – School of Mechanical Engineering, University of West Attica (UNIWA) – Heriot Watt University UK.
• MSc “Management and Optimization of Energy systems”: «Smart grids and dispersed power plants», School of Electrical and Electronic Engineering, University of West Attica (UNIWA).
• MSc “Management and Optimization of Energy systems”: «Advanced Power Electronics Applications – Power Quality», School of Electrical and Electronic Engineering, University of West Attica (UNIWA).
• Msc “By research in Electrical and Electronic Engineering”:  “Smart Energy Systems & ΙοΕ”, School of Electrical and Electronic Engineering, University of West Attica (UNIWA).
• Parallel Lectures in 3 MSc Programs of UNIWA and 1 MSc of the National and Kapodistrian University of Athens: “Research Methodology”.

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Curriculum Vitae