Nicholas A Vovos
University of Patras, Electrical and Computer Engineering, Faculty Member
- Professor N. A. Vovos has been a member of the department of Electrical and Computer Engineering at Patras Universi... moreProfessor N. A. Vovos has been a member of the department of Electrical and Computer Engineering at Patras University since 1981 and he was Head of the department in the time period 2003-2007 and deputy Head in period 2001-2003. His main fields of interest are: analysis, control and protection of HVDC systems, flexible AC transmission systems (FACTS) and Custom Power (CP) devices, dynamic simulation and interaction study of AC/DC systems including FACTS and CP devices, load flow and transient stability methods for AC/DC systems, improvement of the transient stability of AC/DC systems including FACTS and CP devices using power modularity techniques, dynamic simulation and study of thyristor drives and renewable energy sources for rural electricity, dispersed generation and artificial intelligence techniques in power systems. In the previous fields he has been teaching and searching for more than 40 years and has been directed more than 20 research projects funded by industry and EU. He is the author of seven books, two exercises books and he has more than 100 publications. He is life senior member of IEEE, SC14 and SC C2 of CIGRE and is active in a number of working groups. With his proposal, the Interdepartmental Master's Program "Distributed Green Electric Power and the Advanced Network Infrastructure for its Management and Economy " was approved in 2014 by the General Assemblies of the Special Composition of the Departments of Electrical Engineering and Computer Technology and Physics. The Ministry of Education approved the Master's Program on August 13, 2014. Upon the launch of the Master's degree program in 2015, he was elected Director of the program and served in this position until his retirement in 2018. He drafted the study regulations of the Interdepartmental Master's Program, organized, and operated the program by selecting modern courses and suitable teachers, organized the bureaucratic processes and operated the program website. He also wrote the Diploma Supplement in Greek and English. After the approval of the new law on postgraduate studies, he worked and organized the new Postgraduate Studies Regulation for its re-establishment. Today the Interdepartmental Master's Program operates under the name "Green Power Systems: Smart Technologies and Management Strategies".(Professor N. A. Vovos has been a member of the department of Electrical and Computer Engineering at Patras University since 1981 and he was Head of the department in the time period 2003-2007 and deputy Head in period 2001-2003. His main fields of interest are: analysis, control and protection of HVDC systems, flexible AC transmission systems (FACTS) and Custom Power (CP) devices, dynamic simulation and interaction study of AC/DC systems including FACTS and CP devices, load flow and transient stability methods for AC/DC systems, improvement of the transient stability of AC/DC systems including FACTS and CP devices using power modularity techniques, dynamic simulation and study of thyristor drives and renewable energy sources for rural electricity, dispersed generation and artificial intelligence techniques in power systems. In the previous fields he has been teaching and searching for more than 40 years and has been directed more than 20 research projects funded by industry and EU. He is the author of seven books, two exercises books and he has more than 100 publications. He is life senior member of IEEE, SC14 and SC C2 of CIGRE and is active in a number of working groups. With his proposal, the Interdepartmental Master's Program "Distributed Green Electric Power and the Advanced Network Infrastructure for its Management and Economy " was approved in 2014 by the General Assemblies of the Special Composition of the Departments of Electrical Engineering and Computer Technology and Physics. The Ministry of Education approved the Master's Program on August 13, 2014. Upon the launch of the Master's degree program in 2015, he was elected Director of the program and served in this position until his retirement in 2018. He drafted the study regulations of the Interdepartmental Master's Program, organized, and operated the program by selecting modern courses and suitable teachers, organized the bureaucratic processes and operated the program website. He also wrote the Diploma Supplement in Greek and English. After the approval of the new law on postgraduate studies, he worked and organized the new Postgraduate Studies Regulation for its re-establishment. Today the Interdepartmental Master's Program operates under the name "Green Power Systems: Smart Technologies and Management Strategies".)edit
Fuel-cell-based power generation is a promising DG technology, gaining popularity in residential applications due to its cleanliness, portability and suitability for electricity and heat generation. It also features as a great choice for... more
Fuel-cell-based power generation is a promising DG technology, gaining popularity in residential applications due to its cleanliness, portability and suitability for electricity and heat generation. It also features as a great choice for remote isolated residences for covering the water needs. This paper presents an experimental study of a Proton Exchange Membrane (PEM) type Fuel Cell System (FCS), combined with a battery bank supplying some domestic loads. The system could be easily adjusted for grid-connected operation via the dc/ac converter that is employed. A fuzzy logic controller is implemented via a Digital Signal Processor (DSP) and regulates the output of the converter in real time. The controller shows good performance under severe load step changes and rapidly restores the balance between supply and demand at steady state.
Research Interests:
Research Interests:
ABSTRACT A 30KW Wind Turbine, designed and constructed by Greek manufacturers and Research Institutions, is combined with a modular Reverse Osmosis Desalination Plant, in order to: (1) obtain transfer of technology in the design and... more
ABSTRACT A 30KW Wind Turbine, designed and constructed by Greek manufacturers and Research Institutions, is combined with a modular Reverse Osmosis Desalination Plant, in order to: (1) obtain transfer of technology in the design and construction of all parts of the wind Turbine / Desalination system, with special care to critical components, such as: (1.a) aerodynamic design of rotor (1.b) construction of blades (1.c) selection of membranes (1.d) load management and monitoring system (2) obtain the technical capabilities and infrastructure, which allow in the future for: (2.a) design and commercial exploitation of similar systems (2.b) construction of critical and high-added value components of similar systems (2.c) assembly, procurement and maintenance of similar systems (3) lead to the formation of a consortium of companies and research institutions, housed at the Patras Science Park, which will constitute a pioneering Organisation for the design and construction of integrated systems for the exploitation of wind energy combined with desalination systems. Determination of technical specifications was based on three primary criteria: (i) Reliability and world-wide acceptance of methodologies, configuration, material or principle. (ii) Lowest cost without loss of reliability. (iii) Reduction of maintenance cost and effort. and two secondary criteria: (i) optimum exploitation of produced energy at low wind speeds, by a modular arrangement of the desalination plants. (ii) protection of environment and respect of the surroundings aesthetic view, by eliminating the diesel generator and the special design for the rejection of waste from the desalination plant. The combined system is currently being installed at Drepanon Patras, at the premises of TITAN and will be completely autonomous (stand alone). However, wind potential data of representative Aegean islands were used for the design since the wind potential of the system installation site is weak. For the selection of the stand-alone configuration, the following parameters were taken under consideration: (a) non-existence of PPC grid (b) high cost of electricity (c) high water consumption requirement (d) technically, most difficult case.
Research Interests:
Page 1. 113 1 Abstract-- In order to integrate a proton exchange membrane type (PEM) fuel cell system (FCS) to a distribution system, this paper proposes a local controller for providing primary frequency control and local bus voltage... more
Page 1. 113 1 Abstract-- In order to integrate a proton exchange membrane type (PEM) fuel cell system (FCS) to a distribution system, this paper proposes a local controller for providing primary frequency control and local bus voltage support. ...
Research Interests:
Research Interests:
Σκοπός του παρόντος βιβλίου είναι να διερευνήσει τη λειτουργία των Συστημάτων Ηλεκτρικής Ενέργειας (ΣΗΕ) υπό την επίδραση διαταραχών. Καλύπτει την ύλη του μαθήματος «Έλεγχος και Ευστάθεια ΣΗΕ», που διδάσκεται στους φοιτητές του Τμήματος... more
Σκοπός του παρόντος βιβλίου είναι να διερευνήσει τη λειτουργία των Συστημάτων Ηλεκτρικής Ενέργειας (ΣΗΕ) υπό την επίδραση διαταραχών. Καλύπτει την ύλη του μαθήματος «Έλεγχος και Ευστάθεια ΣΗΕ», που διδάσκεται στους φοιτητές του Τμήματος Ηλεκτρολόγων Μηχανικών και Τεχνολογίας Υπολογιστών της Πολυτεχνικής Σχολής του Πανεπιστημίου Πατρών. Η λειτουργία των ΣΗΕ στη μόνιμη κατάσταση είναι αντικείμενο άλλου μαθήματος. Η έννοια του συστήματος προσδιορίζει τον τρόπο ανάπτυξης των θεμάτων με έμφαση στην ποιοτική και φυσική κατανόηση των προβλημάτων και των λύσεών τους, ώστε να γίνουν κατανοητά τα λειτουργικά χαρακτηριστικά των ΣΗΕ. Το βιβλίο καλύπτει κλασσικά και σύγχρονα θέματα που συναντώνται στη μελέτη και εξάσκηση της επιστήμης του ηλεκτρολόγου μηχανικού, γι' αυτό είναι χρήσιμο για νέους αλλά και έμπειρους ηλεκτρολόγους μηχανικούς. Ιδιαίτερη προσπάθεια κατεβλήθη να παρουσιασθούν για πρώτη φορά σε προπτυχιακό επίπεδο τα σύγχρονα θέματα ελέγχου της πραγματικής και της αέργου ισχύος με τ...
Περιέχει όλες τα προβλήματα & Λύσεις που περιέχονται στο βιβλίο Ανάλυση Συστημάτων Ηλεκτρικής Ενέργειας
Περιέχει όλες τα προβλήματα & Λύσεις που περιέχονται στο βιβλίο Έλεγχος και Ευστάθεια Συστημάτων Ηλεκτρικής Ενέργειας
Η αυξανόμενη εξάρτηση της σύγχρονης κοινωνίας από την ηλεκτρική ενέργεια οδήγησε στα σημερινά πολύπλοκα και εκτεταμένα Συστήματα Ηλεκτρικής Ενέργειας (ΣΗΕ). Με τη σημερινή οργάνωση της ζωής μας και η συντομότερη διακοπή της λειτουργίας... more
Η αυξανόμενη εξάρτηση της σύγχρονης κοινωνίας από την ηλεκτρική ενέργεια οδήγησε στα σημερινά πολύπλοκα και εκτεταμένα Συστήματα Ηλεκτρικής Ενέργειας (ΣΗΕ). Με τη σημερινή οργάνωση της ζωής μας και η συντομότερη διακοπή της λειτουργίας των ΣΗΕ προκαλεί τρομακτική αναστάτωση στις δραστηριότητές μας, λόγω του μεγάλου πλήθους των ηλεκτρικών συσκευών που χρησιμοποιούμε στις σύγχρονες κοινωνίες. Επειδή όμως ανεξάρτητα των προσπαθειών μας πάντα θα συμβαίνουν σφάλματα στα ΣΗΕ, η αντιμετώπισή τους απαιτεί συστήματα προστασίας με τη μεγαλύτερη δυνατή αξιοπιστία και ακρίβεια. Η εξέλιξη των ηλεκτρονόμων προστασίας ξεκίνησε με τους ηλεκτρομηχανικούς ηλεκτρονόμους, προχώρησε στους ηλεκτρονόμους στερεάς κατάστασης ή στατικούς και σήμερα διαθέτουμε και ψηφιακούς ηλεκτρονόμους βασισμένους σε μικροεπεξεργαστές με αυτονομία για λήψη λογικών αποφάσεων. Αναγνωρίζοντας την αδυναμία κάλυψης σε ένα μόνο τόμο όλων των προηγούμενων εξελίξεων, του τεράστιου όγκου της θεωρίας και των ποικίλων προβλημάτων που ...
This paper presents a method for the damping of power swings in the ac lines interconnecting two power systems, utilising the fast electronic power flow control characteristics of a parallel dc link. The basic principle of the method is... more
This paper presents a method for the damping of power swings in the ac lines interconnecting two power systems, utilising the fast electronic power flow control characteristics of a parallel dc link. The basic principle of the method is that the dc link is operated in order to maintain constant active power flow in the ac tie lines and constant
Research Interests:
Contents A new method for simulating three phase bridge converters in a flexible and computationally efficient manner is presented. Exploiting the structure of the converter circuit and using a modular modelling technique the state... more
Contents A new method for simulating three phase bridge converters in a flexible and computationally efficient manner is presented. Exploiting the structure of the converter circuit and using a modular modelling technique the state equations of the converter are obtained effectively. The resulting dynamic model simulates successfully a wide range of converter arrangements and is especially suitable for digital computer
Research Interests:
Contents The design of a centralized suboptimal static controller for HVDC links connected to load systems without AC generators, using the projective control technique, is presented. Frequency and voltage variations at the inverter side... more
Contents The design of a centralized suboptimal static controller for HVDC links connected to load systems without AC generators, using the projective control technique, is presented. Frequency and voltage variations at the inverter side are the inputs of the static controller, while the modulation of the DC current settings and the constant extinction angle are the outputs. The design of