Bio
Name: Stanimir Stoyanov Valtchev
Date & Place of Birth: 1951 in Lovetch, Bulgaria
Nationality: Portuguese and Bulgarian
E-mail: ssv @ fct.unl.pt
Web Page: (other page)
SUMMARY
I. BIOGRAPHIC DATA 4
II. EDUCATION 5
2.1. Pre–academic Scientific Courses 5
2.2. Academic Studies and Diplomas 5
2.3. Technical Experience 6
III. PROFESSIONAL EXPERIENCE 6
3.1. Before the career 6
3.2. Research career 6
IV. TEACHING 9
4.1. Technical University in Sofia – Bulgaria 9
4.2. Technical University of Delft, the Netherlands 10
4.3. Institutions in Portugal 10
4.3.1. FUNDETEC 10
4.3.2. ISTP (Licenciatura) 11
4.3.3. ISLA – Santarem (Licenciatura) 11
4.3.4. IST (Licenciatura) 11
4.3.5. UNL 12
4.3.5.1. Licenciatura/BSc/MScI 12
4.3.5.2. PhD 12
4.3.5.3. PostDoc 13
4.3.6. Teaching Exchange, Keynotes, Plenaries and Erasmus 14
V. MEMBER OF JURY OUTSIDE UNL 15
VI. PANELS FOR EVALUATION OF PROJECTS 15
VII. SCIENTIFIC AND ORG-COMMITTEES, CHAIR 16
VIII. ADVISORY BOARDS OF UNIVERSITIES 16
IX. UNIVERSITY AND IEEE MANAGEMENT 16
X. JOURNAL AND PROCEEDINGS EDITOR AND REVIEWER 17
XI. RESEARCH INTERESTS 17
XII. Membership of Professional Organizations 17
XIII. Honorary Awards 18
XIV. Language Skills 18
XV. PUBLICATIONS 19
I. BIOGRAPHIC DATA
Name: Stanimir Stoyanov Valtchev
Born on: June 13, 1951 in Lovetch, Bulgaria
Nationality: Portuguese and Bulgarian
Phone: +351–212947892 (direct phone FCT–UNL), +351–212948300 (exchange)
Fax: +351–212948532 (FCT–UNL)
E–mail: ssv@fct.unl.pt
Current Position: Jubilated (Emeritus) Professor, Doutor, Previous: Associate Professor of Power Electronics, Faculty of Sciences and Technology, UNL, Lisbon
Invited Professor: Burgas Free University, Bulgaria, since 2012
Invited Professor: Technical University Sofia, Bulgaria, since 2018
G. SCHOLAR: https://scholar.google.com/citations?hl=en&user=5-Rq1wYAAAAJ&view_op=list_works&sortby=pubdate
ORCID: https://orcid.org/0000-0002-0536-3113
SCOPUS: https://www.scopus.com/authid/detail.uri?authorId=6603326672
PUBLONS : https://publons.com/researcher/1752851/stanimir-valtchev/
RES. GATE: https://www.researchgate.net/profile/Stanimir_Valtchev
LinkedIn: https://pt.linkedin.com/in/stanimir-valtchev-9330041
Ciencia ID: https://www.cienciavitae.pt//en/A51E-814F-BA05
II. EDUCATION
2.1. Pre–academic Scientific Courses
1969 Concluded the Scientific Option of the Secondary School Course (Class of Mathematics), final score EXCELLENT (5.93 from SIX), in Sofia – Bulgaria.
2.2. Academic Studies and Diplomas
1974 Obtained the Master of Science Degree (Electrical Engineering) from the Technical University of Sofia (Certificate No. 21766 of M.Sc., Dec., 11, 1974) majoring in “Technology of Radio Electronic Equipment, Devices and Integrated Circuits”. Academic score: average 5.45 from SIX for the curricular studies and 6.00 from SIX for the thesis and its presentation. Received the Honour Award with an engraved wristwatch for The Best MSc Degree Graduate of the year. The thesis title is: “Technology of Semiconductor Devices, Applying Solid BN Wafers”, later published a journal article [1]. Invited by the President of the jury Prof. Yamakov, to start PhD studies (semiconductors). This opportunity was not used because of personal reasons and the compulsory military service.
1977 Completed a post–graduation course of Numerical Methods and Programming held in the Technical University – Sofia.
1980–… Participated in many courses and Workshops in Bulgaria and else, e.g. Robotics, EMC, Smart Grids, Batteries, etc.
1993--1994 Being already a university teacher, by the decision of the Academic Council of TU Sofia, presented the main part of a PhD thesis (HF Resonant Converters) and was expected to submit its final version and to defend the degree. Because of financial reasons, the process was not finalized in Bulgaria, and another process started in the Netherlands and Portugal.
1996–1999 Contracted as a consultant of the industry in the Netherlands since 1995, started working on the Resonant Power Converters for Contactless Power Transfer. This experience permitted later to propose the new PhD thesis.
2003 Obtained the Portuguese legal recognition (equivalence) of the Bulgarian MSc. Degree by the Universidade Nova de Lisboa, Portugal.
Apr. 2008 Defended a Doctor’s degree on: “Series Resonant Power Converter for Contactless Energy Transfer with Improved Efficiency” in Instituto Superior Tecnico, Portugal, registered in the Faculty of 3ME (TU Delft, the Netherlands): https://repository.tudelft.nl/islandora/object/uuid:10c8de50-d48a-416b-96d5-0f329a90a903?collection=research.
2.3. Technical Experience
1964 Member of the City Radio Club of Sofia (LZ1KPG), following several amateur electronics and radio constructions accomplished alone and in the Youth Palace.
1969–1971 Involved in research activities during the university studies in the field of radio techniques (member of the Scientific Seminar on radio techniques).
1973–1974 Research work in the field of Semiconductor Device Technology. Received a partial salary as a Student-Researcher of the Scientific Sector of TU Sofia.
1974–1976 Specialized in Radars during the military service, concluded (with diploma) the course for reservist officers, in the Military Academy. Actually has a reservist military rank of Air Force Captain.
III. PROFESSIONAL EXPERIENCE
3.1. Before the career
1971 Two months training (in the summer) in the Telecommunications Factory of Sofia.
1973 Specialization training (semiconductor technology) at the Institute for Semiconductors and in the Plant for Semiconductor Devices – Botevgrad.
3.2. Research career
1974 Began work (a few months before the military service) as a Project Engineer in the Institute of Medical Equipment, in the group of therapy equipment, being involved in designing of automated ergometer for heart disease rehabilitation.
1976 After the military service, lead a team in the Institute of Medical Equipment, designing a cross-field interference therapy device for deep muscular and nervous disorders.
1977 Admitted to the Power Electronics Laboratory at the Technical University – Sofia as а Research Engineer 5th grade.
1978 Won a contest and was appointed for the position of Scientific Researcher 3rd Grade (equivalent then to the teaching position of Assistant) at TU Sofia. Worked on projects of DC–DC power converters (high switching frequency) and DC-AC UPS converters, for 600 W mobile equipment, involving phase–shift regulation.
1978–1980 Coordinates and collaborates in project 1251/78 - Power supplies for High-Voltage CO2 lasers (AC-DC, output 25 kV, 100 mA, regulation <0.1%, medical purposes), financed by Union for Mutual Economic Support (Socialist Countries), Ministries of Industry and technology of USSR and Bulgaria, Ryazan Center of Laser Technology (USSR), TU Sofia (Bulgaria). Constant cooperation with the Factory of Power Supplies in Pernik and the Factory of Lasers in Riasan, USSR.
1978–1980 Coordinates and collaborates in project 1252/78 - Power supplies for He–Ne gas lasers (portable, 8-16 kV, miniaturized, instrumentation purposes), financed by Union for Mutual Economic Support (Socialist Countries), Ministries of Industry and technology of USSR and Bulgaria, Ryazan Center of Laser Technology (USSR), TU Sofia (Bulgaria).
1979 Approved for the position of Scientific Researcher 2nd Grade (equivalent then to the teaching position of Senior Assistant). Worked on projects of:
High Frequency (up to 440 kHz) transistor power converters (leader of the project), Wind generator, based on three-phase equipment (maritime implementation), Induction heating generator (High-Frequency) with 2 kW output (leader of the project), etc.
1984–1986 Worked with the Laboratory for Manipulators and Robots of the same university, as Scientific Researcher, working on projects of:
UPS converter 24VDC/220VAC, up to 5 kW with high switching frequency synthesis of the sine wave, DC motor drives as controlled braking devices in Capacitor–Winding Machine, Electronic equipment (on a trailer) for measuring the road–tyre cohesion for the Traffic Control Department of the Research Institute of Police, Automatic infusion syringe with programmed supply of prescribed amount of liquid for hospital purposes (project together with the Mechanical Engineering Faculty), Portable equipment for measuring and recording of the sportsmen exerts during rowing (used later in other sports), HF low noise power supply for multichannel portable data acquisition system for geophysical purposes (inducing electromagnetic waves in the ground, while registering the reflected signals), etc..
1986- Approved for the position of Scientific Researcher 1st Degree in the Laboratory for Manipulators and Robots. Appointed also Assistant–Director of the Center of Robotics (the Laboratory for Manipulators and Robots was subordinated to that Center). The Center of Robotics (CR) became later the Faculty of Robotics. Now this faculty and CR do not exist any more, because the production of robots factories in Bulgaria stopped too, following the political changes in 1989.
Jan. 1987 Received a Research Scholarship for TU Delft, The Netherlands. Worked on experimental 2 kW MOSFET power converter, continuing the research started in 1980 in Bulgaria, on the higher efficiency of operation of the resonant converters at super–resonant frequency.
Jul. 1987 During the stay in the Netherlands participated in the NATO Advanced Study Institute "Demand–Side Management and Electricity End–Use Efficiency" in Povoa do Varzim, Portugal, organized by the UC Berkeley and the University of Coimbra.
1988– Scientific research projects since the end of 1987 (when approved for the teaching position of Principal Assistant Professor at TU Sofia):
HF DC/DC 2.5 kW “booster” converter implemented in Super–Resonant mode with split inductances, applying 15 output stages in parallel, tested with success to be produced in the Power Supply Factory, Pernik (fasctory closed after 1989), HF power supply 160 W with amorphous iron wound core, for the Typing–Machines Factory (closed now) in Plovdiv (Bulgaria), Power supplies for the public transport automation, Sofia (Bulgaria), etc.
1991–1992 Internship at TU Delft by TEMPUS individual grant earned in contest for academic research activities. The stay was prolonged by a Research Fellowship from the Electrical Engineering Faculty of TU Delft until the end of 1992. Research on:
Multikilowatt High-Frequency super-resonant converter, supplied by stored energy from the single-phase, aimed at 100 kW, 150 kV X–Ray generator.
1992 During a planned by TEMPUS visit to Portugal presented a seminar at the Technical University of Lisbon, Portugal to show his work on Resonant Converters.
1993 Research projects in miniaturization of resonant power converters (TU Sofia), in a started PhD process, later interrupted by the invitation from Portugal.
Feb. 1994 Invited by colleagues from Lisbon to lead a project of HF high–efficiency soft–switching power supply 220VAC/40–60VDC/20A, with a power factor correction. Invented and implemented original topology for a phase–shift regulated converter to achieve high efficiency (96%) at 250 kHz switching frequency. A version of his topology was presented at conferences, having received high appreciation and exploited in many other people’s works and promotions.
1995–1996 Contracted as a consultant for Power Converters by the institute INESC and the factory TAPE (Portugal), highly efficient miniaturized power supplies produced.
1995–2000 Contracted as a consultant of the factory Signaal Special Products (part of Holland Signaal, now owned by THALES Group) in the Netherlands. Projects included resonant and “classical” power converters, also solar power and contactless power transfer (up to 97% efficiency in 15 kW contactless transfer was achieved).
2000–2002 Contracted as a consultant of INESC (power supplies).
2000–2001 Collaborates in power supplies for the project MONICAP, financed by INESC – Lisbon.
2000–2008 Researcher of the Institute of Telecommunications of IST–Lisbon.
2002–2006 Collaborates in project OCAP (Optimization of Circuit Topologies for Active Power Filters), financed by FCT/POCTI, IST-UT Lisbon, IP Tomar.
2008–… Researcher of the Research Institute UNINOVA of FCT–UNL, Lisbon.
2008 Presented a seminar on "Contactless Power Transfer" at TU Delft.
2009–... Guided two teams of students of FCT for the contest “New Idea”, created by the Rectors Office of UNL and BPI, awarded in May 2009 1st and 4th place for Energy Harvesting ideas.
2009–2010 Collaborates in the project DIEMIGO (De Integratie van Elektrische Mobiliteit In de Gebouwde Omgeving), financed by European Community, TU Delft, Schiphol Group – the Netherlands.
2010–... Coordinates and collaborates in project SERVROBOT (Service robot, reconfigurable, off-road, with autonomous behaviour), financed by UNINOVA (UNL), HOLOS, IAPMEI.
2010–... Coordinates and collaborates in the project FLUCON EN (Gerador Turbo Hidráulico), financed by VALCON Ltd., Tecnilab Portugal SA, IAPMEI.
2012–… Coordinates and collaborates in project DERri (Distributed Energy Resources Research Infrastructure) http://www.der-ri.net/, financed by FP7 (approved 2012).
2013–… Projects in reorganisation, e.g. ESTIA, ERANETMED, etc.
2010 - S. Valtchev made a network, by his lecturing in KAIST (Republic Korea), Tokyo University and Tokyo City University (Japan). The network includes industries like APRONEX (Bulgaria), FIAT (Italy), in preparation to develop Electric Vehicles that include contactless energy transfer.
2014–… Projects in cooperation with Russian Federation universities: Ural Federal University, Moscow Institute for Power Engineering, Lipetsk Technical University, etc.
2013-2017 Project with IST, Paulo José da Costa Branco (40%), Stanimir Stoyanov Valtchev (40%), Pedro Oliveira (20%), Análise da interferência em redes eléctrica industrial de acionamentos de motores de indução de velocidade variável: caso do Grupo Valouro
2013-2017 Project with IST, Paulo José da Costa Branco (40%), Stanimir Stoyanov Valtchev (40%), Sizing and Energy Management in Electric Propulsion Systems: Application to a Solar Racing Boat with Energy Recovery
2019- Problems of analysis and control of thermoelectric system based on smart materials, Project TU Sofia + University Lomonossov, Moscow, included as expert Energy Harvesting
IV. TEACHING
4.1. Technical University in Sofia – Bulgaria
1977–1986 Teaching the laboratory classes in Power Supplies Equipment, being appointed Assistant in part-time regime (this position is allowed to full–time Scientific Researchers in TU Sofia).
1987 By the contest at the Department of Power Electronics (TU Sofia), received the position of Principal Assistant Professor (approximately equivalent to “Assistant Professor” in other countries), which position occupied in 1988 after the return from the Netherlands.
1989 Obtained a definitive contract for unlimited time (tenure track) as a Principal Assistant Professor in TU Sofia.
1977–1994 Supervisor of the graduation theses of more than 70 engineers, many of whom were foreigners (began supervising theses as External Supervisor at the time when was still working at the Institute for Medical Equipment). Took part in the jury of many more graduation theses, too.
1977–1988 Taught more than 500 students at seminary and laboratory classes.
1988–1994 Teaching mainly theoretical classes (rarely, some seminary classes) of Power Supply Equipment. Lectured (theory) and examined (orally) more than 800 students.
1989–1994 Appointed as responsible for two subjects, part of a New Master of Science Program:
Modern Power Transistor Converters (4th year students),
Switched–Mode Power Supplies (postgraduate students).
1989–1992 Participated in creating of the new Faculty of Industrial Engineering (where all subjects are taught in English) in cooperation with the Brunel West London University and TU Sofia.
4.2. Technical University of Delft, the Netherlands
1987–1988 Assigned the position of Universitair Docent (i.e. Assistant Professor) at TU Delft, the Netherlands, in the Laboratory of Power Electronics. This was a decision of the Faculty after the first months of the stay in TU Delft.
1987–1992 Advisor and co–advisor of MSc. students projects at TU Delft (e.g. A. Wahjudi and R. G. de Bode).
2009 Collaborated also by substituting in lecturing (during a short stay)
4.3. Institutions in Portugal
4.3.1. FUNDETEC
1995–1996 Lecturing four subjects of the course FUNDETEC (European qualification program in Electrical Engineering and Electronics): Electronics Analog, Digital, Instrumentation, Power Electronics.
4.3.2. ISTP (Licenciatura)
1995–2003 Lecturing (theory and practice) of the subject: Automation and Control (1st semester of the 4th year Mechatronics Engineering).
1996–2003 Lecturing (theory and practice) of the subject: Electrical Measurements (2nd semester of the 3rd year Mechatronics Engineering) and the subject Instrumentation (2nd semester of the 3rd year Mechatronics Engineering).
1997–2003 Lecturing (theory) of the subjects: Electronics I (1st semester of the 3rd year Mechatronics Engineering) and Electronics II (2nd semester of the 3rd year Mechatronics Engineering).
2000–2003 Lecturing (theory and practice) of the subjects: Power Electronics I (1st semester of the 4th year Mechatronics Engineering) and Power Electronics II (2nd semester of the 4th year Mechatronics Engineering).
2002–2003 Lecturing (theory) of the subjects: Theoretical Electrotechnics I (1st semester of the 3rd year Mechatronics Engineering) and Theoretical Electrotechnics II (2nd semester of the 3rd year Mechatronics Engineering).
1995–2003 Supervised more than 10 final projects of students at ISTP.
4.3.3. ISLA – Santarem (Licenciatura)
1996–2002 Lecturing (as Invited Auxiliary Professor, theory and practice) of the subjects: Power Electronics I (2nd semester of the 3rd year Industrial Electrical Engineering) and Power Electronics II (1st semester of the 4th year Industrial Electrical Engineering).
1997–2002 Lecturing (theory and practice) of: Numerical Methods (2nd semester of the 3rd year Industrial Electrical Engineering).
1998–2002 Lecturing (theory and practice) of: Electronics of Regulation and Commanding (1st semester of the 4th year Industrial Electrical Engineering).
1996–2002 Supervised the final projects of more than 15 students at ISLA.
4.3.4. IST (Licenciatura)
2000–2001 Lecturing (practice) of: Power Electronics (1st semester of the 5th year Electrical and Computer Engineering – branch: Control and Robotics).
2000–2008 Co–supervised the final projects of at least 7 students at IST.
2015–… Co–supervised MSc theses of more students at IST.
4.3.5. UNL
4.3.5.1. Licenciatura/BSc/MScI
2002–… Lecturing (theory and practice) of: EPA - Power Electronics in Actuators (2nd semester of the 4th year Electrical and Computer Engineering, now passed to the 1st sem.).
2002–… Lecturing (practice) of: Theoretical Electrotechnics (1st semester of the 2nd year Electrical and Computer Engineering).
2002–… Lecturing (theory and practice) of: Instrumentation and Electrical Measurements (2nd semester of the 3rd year Electrical and Computer Engineering).
2008–2014 Lecturing (theory and practice) of: Instrumentation & Monitoring (1st sem.) subject of the new Renewable Energy Master Course. This subject is excluded from the program now.
2008–… Lecturing (theory and practice) of: Power Electronics (2nd sem.) subject of the new Renewable Energy Master Course. Now this course is named Processing and Storage of Electric Energy.
2012–2013 Lecturing (theory and practice) of: High Voltage Engineering (1st semester of the 4th year Electrical and Computer Engineering).
2012–2013 Lecturing (theory and practice) of: Technologies of Renewable Energies (1st sem.) of the new Renewable Energy Master Course.
2002–… Supervised theses of 37 MSc students and currently supervising 3.
4.3.5.2. PhD
2008–… Lecturing (tutorial) of: Specific Topics of the PhD degree students course.
2009–… Advisor of PhD students:
The local PhD, that defended already the theses:
David Cavalheiro, “Ultra-Low Power Circuits based on Tunnel FETs for Energy Harvesting Applications”, defended May 2017, S. Valtchev was co-advising, jury meeting in UPC, Barcelona, S. Valtchev was present as a member of jury.
Elena Baikova, “Transferência de Energia sem Contacto: Estudo das Emissões do Campo Elétrico”, defended March 2019, S. Valtchev was advising, other colleagues were invited during the work, jury met in FCT-UNL, S. Valtchev was present as a member of jury.
The co-advised in Bulgaria and Russia, that defended already:
Maxim Khabbibullin, “Active Filters of Higher Harmonics in the Controlled AC Drives”– defended 2015, co-advising with V. Mescheryakov
Olga Danilova, “Neural Networks Applied to Control the Drives in Transport”– defended 2017, co-advising to V. Mescheryakov
Not finished yet their PhD:
Kaloyan Mihailov, “Auto-supplied sensors through energy harvesting”, S. Valtchev is his main advisor, with TU Sofia, since 2012, any moment will be defended, he is ready.
Vladimir Ivashkin, “Motor Drives”– co-advising with V. Mescheryakov since 2016, almost ready
Vladimir Voekov, “Motor Drives” - co-advising with V. Mescheryakov since 2016, almost ready
Rui Neves Medeiros, “Contactless Power Transfer” - advisor, later with other colleague, since 2012, received scholarship from FCT, personal problem, parents died in fire, not responding.
Luis Romba Jorge, “Contactless power with three-phase transmitter” - advisor, later with other colleague, since 2013, near to ready, but has health problem
Jose Gonçalves Teixeira, “High Power Factor HF three-phase converter” -advisor, later with other colleague, since 2016, near to finish it, problems with the scholarship from Angola.
Paulo Bonifacio, “Specialised hospital sensor network with energy harvesting”, advisor with other colleague, since 2019, still in the beginning, but strongly progressing.
4.3.5.3. PostDoc
The ones that already finished their stay:
Olexandr Burykin, 2014, Associate Professor of Vinyica Technical University, Vice Dean, Ukraine. He was interested in the application of renewable energy in Portugal, local co-advisor to Vinyica Technical University.
Maxim Habbibullin, 2016/7, “Active Filters”, local co-advisor to V. Mescheryakov, Lipetsk State Technical University, Russian Federation.
Mikhail Mudrov, 2016/17, “Hardware-in-the-Loop”, local co-advisor to Ural Federal University, Yekaterinburg, Russian Federation, continued connection with the main professor, DSc Anatoly Zyuzev.
From M. Habbibullin and M. Mudrov, many interesting research articles were published, but nothing came from O. Burykin.
4.3.6. Teaching Exchange, Keynotes, Plenaries and Erasmus
2008 - Lecture in TU Delft
2009 - Three-months stay in TU Delft guiding MSc thesis of Jeremie Doppler and advising Neil Stembridge, postdoc in TU Delft
2009–... Since that time 14 contracts of ERASMUS agreements are coordinated by S. Valtchev as contact person, with TU Delft, Technical University of Warsaw, University of Bucharest, University of Transport in Sofia, University of Suceava, Universidad Politecnica de Madrid, Burgas Free University, with Technical University of Sofia, with the Military Academy of Sofia and many more. Regular exchange of students and academici have been organized to and from FCT-UNL, e.g. Prof Szumanowski and the EV.
2010 - The network is enlarged by other partners in the academic cooperation, including, University of Torino, University of Aachen, Institute of Technology of Beijing, etc.
2010 - S. Valtchev made the network wider, by his lecturing in KAIST (Republic Korea), Tokyo University and Tokyo City University (Japan). The contacts are in preparation for a MSc program that will develop engineers of Electric Vehicles, including contactless energy in the programs.
2010–... Academic cooperation network is developed that includes FCT/UNL and Warsaw University of Technology, for developing a new MSc curriculum.
2010–... Keynote Speaker for International Symposium on Electric Vehicle and 2-nd Annual Conference of Polish Society for Environment Friendly Vehicles, 2010, Warsaw
2011 - Erasmus lecturing in TU Sofia, Bulgaria.
2011 - Keynote Speaker for First Conference with International Participation "Education, Science, Innovations", May 2011, Pernik, Bulgaria.
Every year - Invited speaker of INTELEC industry seminar (named INTLEC95) in the Netherlands every year in April, many times in the last years.
2014 Keynote speaker at the Workshop on Costs, Benefits and Impact Assessment of Smart Grids for Europe and Beyond (23-25 April 2014, Antalya/Turkey).
2014 Keynote speaker at the 12th International Conference on Development and Application Systems (May 15-17, 2014 - Suceava, Romania).
2015 Invited speaker at the 12th International Conference on Applied Electromagnetics ПЕС 2015 in Nis, Serbia (August– September 2015).
2015-… Invited speaker at the 16th International Scientific Technical Conference Alternating Current Electric Drives (ACED), Ekaterinburg, Russia in 2015 and more.
2016-… Invited speaker at International Scientific Technical Conference Alternating Current Electric Drives (ACED), Istanbul, Turkey (March 2016).
2016 Invited speaker at the International Scientific Conference of Burgas Free University, Bulgaria (September 2016)
2017 Keynote speech at the National Moscow Power Engineering Institute Conference and the 3rd all-Russia Competition "Best development of young researchers and engineers in power electronics", Moscow, 22-24 October 2017
2019 Lecturing in the Burgas Free University (ERASMUS Exchange)
2019-… Keynote speaker at IEEE GPECOM International Conferences 2019-2022 Turkey.
2019-… Keynote speaker at IEEE SUMMA International Conference 2019-2022 Russia.
2020 Keynote speaker at the 15th International Conference DAS, May 2020, Suceava, Romania, http://www.dasconference.ro/.
2021 Lectures in Naval Academy in Varna, Bulgaria.
V. MEMBER OF JURY OUTSIDE UNL
2011... Consultant on the contents of Academic Plans and Programs of the European Polytechnic University, Bulgaria.
Nov 2015 Speaker at Jury for defending a MSc in IST, Luís Carlos Silva Pinto
May 2016 Speaker at Jury for defending a MSc in ISEL, Bruno Miguel dos Reis Pinto
May 2017 Member of Jury for defending a PhD in UPC Barcelona, David Cavalheiro
June 2017 Re-defending the Degree of PhD in Electrical Engineering and Computers by Imed Jlassi, UBI
Mar 2019 Re-defending the Degree of PhD in Electrical Engineering and Computers by Amel Adouni, UBI
Dec 2019 Speaker at Jury for defending a MSc in IST, Beatriz Durão
Dec 2022 Speaker at Jury for defending PhD in UMinho, Luiz Cardoso
VI. PANELS FOR EVALUATION OF PROJECTS
2009-2016 Member of more than 15 Evaluating Panels, plus reanalyses, and expert for final closure of the IAPMEI projects QREN in more than 50 projects e.g. 2520, 2523, 5279, 5566, 5569, 5570, 5633, 5448, 11990, many more.
2013-2014 Member of evaluation board for project COST, several.
2018 Member of the evaluation panel for the Skoltech University, Moscow, Russian Federation.
VII. SCIENTIFIC AND ORG-COMMITTEES, CHAIR
2016 General Chair of the international Power Electronics and Motion Control (IEEE-PEMC 2016) conference in Varna, Bulgaria.
2019 Honorary Chair and General Co-Chair of the IEEE SUMMA conference in Lipetsk, Russia.
2019-… General Co-Chair of the international IEEE GPECOM 2019 conference in Nevsehir, Turkey.
Many years Section Chair in many, e.g. POWERENG, OPTIM, INTELEC, INTELEC, PEMC, SPEEDAM, etc.
Many years Program and Scientific Committee Member for POWERENG, ICEST, OPTIM, INTELEC, EPQU, ICRERA, ISIE, SPEEDAM, IECON, PEMC, etc..
Many years Organizing Committee Member of INTELEC, SESC, ICEST, IEPS, PES, ACED (now is IEEE!), MCCS, ISEV, EPQU, SPEEDAM, etc.
Many years The main IEEE conferences he was organizing: IEEE PEMC2020; PEMC 2016 Gen.chair; IEEE GPECOM 2019-22 General Cochair; IEEE SUMMA2019-22 General chair and Honorary chair, AMC 2024, etc., all mainly IES conferences. Some, like eGrid24, are PELS/PES conferences, which he will chair.
VIII. ADVISORY BOARDS OF UNIVERSITIES
2018... Member of the advisory board of the Beijing Jiao Tong University (one of the top publishing schools), responsible for the School of the Renewable Energies, Beijing, China.
IX. UNIVERSITY AND IEEE MANAGEMENT
1986–1987 Assistant Director of the Center of Robotics. This Center later became the Faculty of Robotics at TU Sofia – Bulgaria.
1990–1994 Deputy Dean for the Foreign Students at TU Sofia (position related to the whole university, responsible for the educational problems of the foreign students, post–graduates and PhD students).
2008–... Member of the Scientific Council of the MSc Program in Renewable Energy (MERCEUS), represents the Department of Electrical Engineering.
2014-… Chair of the Technical Sub-Committee on Intelligent Motor Drive, in IES of IEEE, Technical Committee of Sensors and Actuators
2022-… Treasurer of IEEE LMAG in Portugal
2023-… Member of the in IEEE Region8 Committee on Milestones
X. JOURNAL AND PROCEEDINGS EDITOR AND REVIEWER
2005-… Reviewer for the Proceedings of IEEE PESC’05, PESC’07, PESC’08, ECCE 2009, OPTIM’08, OPTIM´2010, OPTIM’12, POWERENG’07, POWERENG’09, IECON, EPE-PEMC, PEMC, IEEE-PEMC, ISIE, ECCE, GPECOM, etc.
2008-… Reviewer of the Transactions of the IEEE on Power Electronics, Industrial Electronics, Circuits and Systems, Mechatronics, Transportation, etc.
2011-... Member of the editorial board of the university journal “Visnyk of the Polytechnic Institute”, Vinnytsia National Technical University, Ukraine.
2014-... Member of the editorial board of the journal “Vesti VUZ Chernozemia”, means “Proceedings of the Universities of Central Russia”, published by several universities, including LSTU, Lipetsk National Technical University, Russia
2020-… Guest editor of the special issue "Battery Chargers and Management for Electric Vehicles", https://www.mdpi.com/journal/electronics/special_issues/EV_energy, Journal Electronics, impact Factor 1.764.
2021-… Member of the editorial board in “Electrical and Data Processing Systems”, Ufa, Russia, “Kazan State Power Engineering University Bulletin”, “Power engineering: research, equipment, technology”, etc.
XI. RESEARCH INTERESTS
Energy conversion implemented by totally controllable devices, soft–switching techniques, resonant transition, super resonant frequency control, combined with phase-shift and PWM regulation. Induction and other contactless heating of materials. Energy transfer (especially contactless).
Renewable energies, recuperation of heat, energy harvesting from solar, thermal, mechanical and other renewable sources of energy, microminiaturized power converters. Lowest-Power Efficient Electronics: Tunnel FET devices and low energy auto-supplied bio-medical sensors, remote sensing and diagnostic equipment especially self-powered ones. Sensors and defect detection systems.
Power Electronics-Controlled drives and actuators, precise instrumentation and miniaturization of the power converters. Electric vehicle: battery management, energy management, bi-directional and unidirectional (also contactless) energy transfer, etc.
XII. Membership of Professional Organizations
– Scientific and Technology Society of Engineers – Bulgaria (in the past),
– Institute of Electrical and Electronic Engineers (Member 1990, SM 2008, Life SM 2022),
– Power Electronics Society of IEEE (since 1991),
– Industrial Electronics Society of IEEE (since 1993),
– Instrumentation Society of IEEE (since 2008-2011),
– Industry Applications Society of IEEE (since 2014),
– Circuits and Systems Society of IEEE (2014-2019+more),
– Power and Energy Society of IEEE (since 2018),
– Sailing Club of TU Sofia – Bulgaria (in the past),
XIII. Honorary Awards
1960s From the school, for results at the Math Olympiads, dedicated books and diplomas.
1974 From TU Sofia, engraved wrist watch for “The Best MSc Graduate of the Year 1974”, majoring in “Technology of Radio Electronic Equipment, Devices and Integrated Circuits”.
1997 From IEEE, “Meritorious Paper Award” for article published in 1996, diploma.
2008 From IEEE, attributed “Senior member of IEEE”, diploma.
2009 Two groups of students lead by S. Valtchev obtained 1st and 4th place in the final of the “New Idea Competition”, UNL rectors office and bank ES.
2011 From IEEE, for “Dedication and valuable contributions to the 33rd International Telecommunications Conference INTELEC”, Appreciation Award for the work on the Technical Program, diploma.
2011 The article “Computer Model for Railway Inductive Power Supply Using Valtchev Model” published under DOI: 10.1109/ICEMS.2011.6073510, names the model in recognition to the model´s author.
2012 Elected as Invited Full Professor by the decision of the Academic Council of the Burgas Free University, Bulgaria.
2014 Confirmed as Invited Full Professor by the newly elected Academic Council and new Rector of the Burgas Free University, Bulgaria.
2019 Elected as Invited Professor by the decision of the Faculty of Mechanical Technology and the Academic Council of TU Sofia, Bulgaria.
2014 From IEEE and PEMC Council, “Best Paper Award” for article [C72] presented at PEMC 2014, Antalya, Turkey.
2015 from Power Electronics Society of IEEE, commemorative present
XIV. Language Skills
Bulgarian, fluency: oral and written (school diplomas)
Russian, fluency: oral and written (school and university diplomas)
English, fluency: oral and written (school, university and other diplomas)
Dutch, fluency: oral and written (three levels of Dutch language diplomas)
Portuguese, fluency: oral and written (no special course)
Other language courses taken (weaken knowledge):
French, 1960
Czech, 1970
German, 1977–78