Oprea Claudiu Alexandru

@utcluj.ro

Departamentul de Mașini și Acționări Electrice
Universitatea Tehnica din Cluj-Napoca

Oprea Claudiu Alexandru


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https://researchid.co/claudiuoprea
42

Scopus Publications

657

Scholar Citations

14

Scholar h-index

19

Scholar i10-index

Scopus Publications

  • A Passive Battery Management System for Lead-Acid battery
    Adrian Augustin Pop, Razvan Inte, Claudiu Oprea, Mircea Ruba
    EPJ Web of Conferences, 2025
    One of the dangerous issues that can appear when working with batteries is the imbalance of the cell. To overcome this problem, the battery management systems (BMS) can provide balancing by extracting or adding charge according to the needs. The goal is to protect the battery from dangerous overheating or damage but also to prolong the battery’s lifetime. Without a BMS the individual cell voltage will drift away, and the estimation of the state of charge will be unreal. The BMS is detecting automatically when the battery pack is charged, and it enables passive balancing of charged cells. The goal of this paper is to test the BMS system adapted for lead acid batteries and visualizing the performances by using real time application by means of graphical instruments. The measured parameters as current, voltage, temperature is displayed with the help of dSPACE and Typhon HIL platforms.
  • Lead Acid Battery Parameters Identification, Modelling and Testing Applied for a Hybrid-Electric Funicular Concept
    Şerban Paula, Sebastian Ursache, Claudiu Oprea, Gabriel Chindriș, Mircea Ruba, et al.
    2024 24th IEEE International Conference on Automation Quality and Testing Robotics Aqtr 2024 Proceedings, 2024
    The present paper introduces a new concept in the field of vehicle electrification, referring not to a cargo or passenger one but to a funicular. The latter’s operation is normally based on an internal combustion diesel engine. In order to align such an application with the current trends in field of electrification, a project was developed to develop a hybrid solution. The requirements were based on the philosophy that during its operation, the funicular can recover a large quantity of energy during log’s downhill, as the system actually must operate as brake. Studies were engaged when decisioning on the chemistry, Li ion or Lead Acid. The latter one handshake well with operating cycles of a funicular as well as low temperature exposure in forest has less impact on the battery performances. Even more, safety-wise, the Lead Acid cells are not susceptible for fire in case of faults, that is mandatory regulation in forest exploitations. To design and study this system, a complex simulation environment had to be developed, mixing Simcenter Amesim software (for the mechanics) with MATLAB Simulink (for the batteries). Nevertheless, precise battery parameters identification and modelling required processes that are detailed in the paper.
  • X-in-the-Loop-Based High Accuracy Test Facility for Industrial Development of Electric Vehicles
    Raul Nemes, Mircea Ruba, Raluca Raia, Claudia Martis, Claudiu Oprea
    IEEE Transactions on Transportation Electrification, 2023
  • STRUCTURAL AND MODAL ANALYSIS IN SOLIDWORKS OF AGRICULTURAL PLOW TO CHOOSE VIBRATION SYSTEM AT MOLDBOARD
    Gabriel Gheorghe, Daniel Lates, Claudiu Oprea, Carmen Baltatu
    Engineering for Rural Development, 2023
    This article presents the way to obtain the structural model for elementary linear-elastic static analysis of the moldboard of the plow. Also, to prove the functionality of the structural model obtained, the structural analysis results for the linear elastic static test are presented. These results are useful for estimating the safety factor and for assessing the behavior in major overstress situations at the main part of the machine. Structure dynamics is a very broad discipline that uses a huge arsenal of theoretical and experimental methods to solve the fundamental problem of structures: the dynamic response to variable tasks over time. Vibrations, and especially vibration in resonance modes, are problems that occur frequently in large structures. As large structures with large numbers of components cannot be optimally engineered for resonant regimes, it is often done to resolve structures or improve them by using the modal analysis of the mathematical models of these structures. The usefulness of this analysis is particularly evident in the testing phase and even in the first stages of operation when it is necessary to improve the working regime of a product of the type analyzed. The main results of the static linear-elastic structural analysis are the values of the reactions in the holders, vector field distribution of the relative – resultant displacement in the structure, tensor fields’ distribution of the specific deformation and the Cauchy stress tensor in the same structure. Also, an important result for structure safety is the distribution of the safety factor. The analysis of the equipment’s own spectrum allows proper identification of the main frequencies, at which a resonant working regime can occur as well as the necessary forces to choose the optimal vibration system.
  • Artificial intelligence (AI)-based optimization of power electronic converters for improved power system stability and performance
    Ioana-Cornelia Gros, Xiaoshu Lü, Claudiu Oprea, Tao Lu, Lucian Pintilie
    Proceedings of the 2023 IEEE 14th International Symposium on Diagnostics for Electrical Machines Power Electronics and Drives Sdemped 2023, 2023
    The present review paper provides an overview of the recent advances in AI-based techniques for the design and optimization of power electronic converters. There is an increased demand on power converters in applications like renewable energy generation, microgrids, electric and hybrid vehicles, high-voltage DC power transmission etc. with focus on their design and optimization. In this context, various AI techniques are discussed, such as: machine learning, deep learning, reinforcement learning, and evolutionary algorithms, artificial neural networks, fuzzy logic control, expert systems and their applications in power electronics and electric drives. Some case studies from the literature are referred and potential benefits of AI-assisted design and optimization of power electronic converters with aspects of enhanced power system stability and performance are highlighted.
  • Initial Evaluation of the Performances of a Sled-Type Forest Cableway
    Daniel Lates, Razvan Alexandru Inte, Mihai Chirca, Marius Dranca, Claudiu Oprea
    Lecture Notes in Networks and Systems, 2023
  • Modelling, Parameters Identification and SOC Estimation Used for BMS Solutions of ROMBAT LFP Battery Technology
    Mircea Ruba, Sebastian Ursache, Şerban Paula, Claudia Martis, Mihai Diţ, et al.
    2023 IEEE Vehicle Power and Propulsion Conference Vppc 2023 Proceedings, 2023
    The paper presents a complete hands-on procedure for LFP battery parameters identification, several modelling approaches and state of charge (SOC) estimation based on Kalman Filter approach. The background of the paper reflects the development of a battery management system (BMS) for storage applications developed in a cooperation between the Technical University of Cluj Napoca, Romania and ROMBAT Romania, an industrial partner with its main activity in the field of battery production. Considering that the outcome must become a vendable solution, the authors investigate several methods of creating a battery model to be embedded into a real BMS. Benchmarking their operational skills is handled by comparative analysis between simulation of those models and actual measurements. To create these models, the battery parameters must be identified at cell level. Also, the SOC estimation, traditionally approached by coulomb counting is replaced by a more precise method, namely the Kalman Filter one. The results presented on different operational scenarios prove the accuracy of the models as well as the one of the SOC estimations, underlying the benefits of using such an approach for a real BMS.
  • Design of Permanent Magnet Synchronous Motor for Hybrid Sled-Type Forest Cableway
    Marius Drancă, Mihai Chirca, Ințe Răzvan, Sorin Cosman, Daniel Lates, et al.
    Proceedings of the International Conference on Optimisation of Electrical and Electronic Equipment Optim, 2023
    This paper proposes an interior permanent magnet (IPM) synchronous motor as solution for an electric sled-type forest cableway. Design evaluation based on 2D finite-element field analysis proves that the IPM motor meets the necessary specifications. The study approaches also the thermal and demagnetization analysis with the aim to determine whether the permanent magnets on the rotor disk are subject to overheating during typical electric motor operation, which could result in permanent-partial demagnetization of the magnets.
  • Experimental Tests on a Spoke-Type Permanent Magnets Synchronous Machine for Light Electric Vehicle Application
    Stefan Breban, Marius Dranca, Mihai Chirca, Alexandru-Madalin Pacuraru, Petre-Dorel Teodosescu, et al.
    Applied Sciences Switzerland, 2022
    In an attempt to limit the effects of global warming, virtually all car manufacturers have introduced in the last years Hybrid or full Electric Vehicles. The current study shows the experimental testing of a spoke-type PMSM that was developed based on the requirements of the L6e European light vehicle class. A test bench was developed for this purpose, using a DC machine fed by a bidirectional DC Power Supply that allowed the testing of the PMSM prototype both in motor and generator/brake regimes. The Worldwide Harmonized Light-Duty Vehicles Test Procedure (WLTP) was implemented on the control stage of the testing set-up, allowing an accurate estimation of the PMSM-based E-drivetrain performance. The test results validated the FEM-simulated results and provided an insight on the efficiency of the entire drive system (battery–inverter–PMSM) and the autonomy of the L6e light EV. The electric drive system was integrated and tested on a prototype vehicle in normal operating conditions, validating the results obtained on the developed test bench.
  • PMSM Evaluation for Electric Drive Train for L6e Light Electric Vehicles
    Mihai Chirca, Marius Alexandru Dranca, Stefan Breban, Claudiu Alexandru Oprea
    EPE 2020 Proceedings of the 2020 11th International Conference and Exposition on Electrical and Power Engineering, 2020
    The current study aims to determine the best propulsion machine for a Light Electric Vehicle compatible with L6e quadri-cycle constrains defined by the European Commission. The performance evaluation is made between two permanent magnet synchronous machine with different rotor topology, namely the spoke type rotor and the interior permanent magnets rotor.
  • Electronically controlled actuators for a micro wind turbine furling mechanism
    Mihai Chirca, Marius Dranca, Claudiu Alexandru Oprea, Petre-Dorel Teodosescu, Alexandru Madalin Pacuraru, et al.
    Energies, 2020
  • Experiential Learning Through Controlling and Monitoring a Real-Time 3D House Using LabVIEW in a Virtual Laboratory
    Bogdan M. Mîndruț, Claudiu A. Oprea
    Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics, 2020
  • Initial Evaluation of Permanent Magnet Synchronous Motor Structures for Light Electric Vehicle Applications
    Claudiu Alexandru Oprea, Calin Iclodean, Mihai Chirca, Marius Dranca, Florin Ghita, et al.
    IEEE International Symposium on Industrial Electronics, 2019
  • Development of an automated system to optimize greenhouse resource consumption
    Sorin I. Cosman, Cristina A. Moldovan, Rares A. Iusan, Claudiu Oprea, Claudia S. Martis
    Proceedings of 2019 8th International Conference on Modern Power Systems Mps 2019, 2019
  • Performance Evaluation of a 7.5 kW Permanent Magnet Assisted Synchronous Reluctance Machine for Light Electric Vehicles
    Andreea-Madalina Nicorici, Claudiu Oprea, Claudia Martis
    EPE 2018 Proceedings of the 2018 10th International Conference and Expositions on Electrical and Power Engineering, 2018
  • Design, Building and Testing of a Low Voltage-High Current Drive for SRMs Used for HVAC Applications
    Sorin Iulian Cosman, Vasile Ionut Boanca, Claudiu Oprea, Claudia Steluta Martis
    EPE 2018 Proceedings of the 2018 10th International Conference and Expositions on Electrical and Power Engineering, 2018
  • Comparative analysis regarding the use of hybrid energy generation systems for residential buildings
    Gheorghe Badea
    International Multidisciplinary Scientific Geoconference Surveying Geology and Mining Ecology Management Sgem, 2018
  • A review on romanian potential of renewable energy sources for power generation in building applications
    Gheorghe Badea
    International Multidisciplinary Scientific Geoconference Surveying Geology and Mining Ecology Management Sgem, 2018
  • Multi-physics design of synchronous reluctance machine for high speed applications
    Arkadiusz Dziechciarz, Claudiu Oprea, Claudia Martis
    IECON Proceedings Industrial Electronics Conference, 2016
  • Optimal design of a radial flux spoke-type interior rotor permanent magnet generator for micro-wind turbine applications
    Mihai Chirca, Claudiu Oprea, Petre-Dorel Teodosescu, Stefan Breban
    2016 International Conference on Applied and Theoretical Electricity Icate 2016 Proceedings, 2016
  • Comparative design analysis of ferrite-permanent-magnet micro-wind turbine generators
    Mihai Chirca, Stefan Breban, Claudiu Oprea, Mircea M. Radulescu
    Joint International Conference Acemp 2015 Aegean Conference on Electrical Machines and Power Electronics Optim 2015 Optimization of Electrical and Electronic Equipment and Electromotion 2015 International Symposium on Advanced Electromechanical Motion Systems, 2016
  • Electromagnetic and structural analysis of a Synchronous Reluctance Machine
    Claudiu Alexandru Oprea, Claudia Steluta Martis, Petru Cristinel Irimia, Calin Husar, Mihail Grovu
    Joint International Conference Acemp 2015 Aegean Conference on Electrical Machines and Power Electronics Optim 2015 Optimization of Electrical and Electronic Equipment and Electromotion 2015 International Symposium on Advanced Electromechanical Motion Systems, 2016
  • Design Process of Advanced Reluctance Machines for Electric Vehicle Applications: On Target Setting, Optimization of Different Reluctance Motors Technologies and Assessment of the Most Promising Propulsion Technology for Electric Vehicle Applications
    Cassio T. Faria, Remi Mongellaz, Claudiu Oprea, Fabrice Boon, Saphir Faid, et al.
    2015 IEEE Vehicle Power and Propulsion Conference Vppc 2015 Proceedings, 2015
  • Comparative analysis of different synchronous reluctance motor topologies
    Claudiu Oprea, Arkadiusz Dziechciarz, Claudia Martis
    2015 IEEE 15th International Conference on Environment and Electrical Engineering Eeeic 2015 Conference Proceedings, 2015
  • Analysis of innovative design variations for double-sided coreless-stator axial-flux permanent-magnet generators in micro-wind power applications
    M. Chirca, S. Breban, C.A. Oprea, M.M. Radulescu
    Proceedings 2014 International Conference on Electrical Machines ICEM 2014, 2014

RECENT SCHOLAR PUBLICATIONS

  • A Passive Battery Management System for Lead-Acid battery
    AA Pop, R Inte, C Oprea, M Ruba
    EPJ Web of Conferences 330, 07002 , 2025
    2025
  • Lead Acid Battery Parameters Identification, Modelling and Testing Applied for a Hybrid-Electric Funicular Concept
    Ş Paula, S Ursache, C Oprea, G Chindriș, M Ruba, R Ințe, A Zinveli, ...
    2024 IEEE International Conference on Automation, Quality and Testing … , 2024
    2024
    Citations: 2
  • Research on the development of an innovative vibratory system for in operation and manufacturing ploughs
    M Mateescu, E Marin, D Manea, GV Gheorghe, C Bălțatu, EM Cismaru, ...
    Annals of the Faculty of Engineering Hunedoara 22 (2), 141-146 , 2024
    2024
    Citations: 1
  • Modelling, Parameters Identification and SOC Estimation Used for BMS Solutions of ROMBAT LFP Battery Technology
    M Ruba, S Ursache, Ş Paula, C Martis, M Diţ, C Oprea
    2023 IEEE Vehicle Power and Propulsion Conference (VPPC), 1-6 , 2023
    2023
  • Design of Permanent Magnet Synchronous Motor for Hybrid Sled-Type Forest Cableway
    M Drancă, M Chirca, I Răzvan, S Cosman, D Lates, C Oprea
    2023 International Aegean Conference on Electrical Machines and Power … , 2023
    2023
    Citations: 1
  • Artificial intelligence (AI)-based optimization of power electronic converters for improved power system stability and performance
    IC Gros, X Lü, C Oprea, T Lu, L Pintilie
    2023 IEEE 14th international symposium on diagnostics for electrical … , 2023
    2023
    Citations: 20
  • EXPLORING THE FEASIBILITY OF PARALLEL I²C SENSOR INTERFACING ON AN EDUCATIONAL FPGA BOARD: RESOURCE UTILIZATION ANALYSIS AND DESIGN CONSIDERATIONS.
    CA OPREA, BS KIREI, RVF TURCU
    Studia Universitatis Babes-Bolyai, Physica 68 , 2023
    2023
  • Structural and modal analysis in Solidworks of agricultural plow to choose vibration system at moldboard
    G Gheorghe, D Lates, C Oprea, C Baltatu
    Engineering for Rural Development 22, 872-878 , 2023
    2023
    Citations: 10
  • ANALYSIS OF THE CYLINDRICAL GEAR WHEELS IN THE GEAR OF THE CENTRAL DRUM OF THE CABLEWAY
    D Lates, C Oprea
    Acta Technica Corviniensis-Bulletin of Engineering 16 (1), 67-70 , 2023
    2023
  • of a Sled-Type Forest Cableway
    C Oprea
    The 16th International Conference Interdisciplinarity in Engineering: Inter … , 2022
    2022
  • X-in-the-loop-based high accuracy test facility for industrial development of electric vehicles
    RO Nemeş, M Ruba, MR Raia, C Marţiş, CA Oprea
    IEEE Transactions on Transportation Electrification 9 (2), 2778-2791 , 2022
    2022
    Citations: 6
  • Initial Evaluation of the Performances of a Sled-Type Forest Cableway
    D Lates, RA Inte, M Chirca, M Dranca, C Oprea
    International Conference Interdisciplinarity in Engineering, 183-196 , 2022
    2022
    Citations: 6
  • Experimental tests on a spoke-type permanent magnets synchronous machine for light electric vehicle application
    S Breban, M Dranca, M Chirca, AM Pacuraru, PD Teodosescu, CA Oprea
    Applied Sciences 12 (6), 3019 , 2022
    2022
    Citations: 13
  • Experiential Learning Through Controlling and Monitoring a Real-Time 3D House Using
    BM Mîndruț, CA Oprea
    Innovative Technologies and Learning: Third International Conference, ICITL … , 2020
    2020
  • Experiential Learning Through Controlling and Monitoring a Real-Time 3D House Using LabVIEW in a Virtual Laboratory
    BM Mîndruț, CA Oprea
    International Conference on Innovative Technologies and Learning, 119-127 , 2020
    2020
    Citations: 3
  • PMSM evaluation for electric drive train for L6e light electric vehicles
    M Chirca, MA Dranca, S Breban, CA Oprea
    2020 International Conference and Exposition on Electrical And Power … , 2020
    2020
    Citations: 9
  • Electronically Controlled Actuators for a Micro Wind Turbine Furling Mechanism
    M Chirca, M Dranca, CA Oprea, PD Teodosescu, AM Pacuraru, C Neamtu, ...
    Energies 13 (16), 4207 , 2020
    2020
    Citations: 8
  • Initial Evaluation of Permanent Magnet Synchronous Motor Structures for Light Electric Vehicle Applications
    CA Oprea, C Iclodean, M Chirca, M Dranca, F Ghita, Ș Breban
    2019 IEEE 28th International Symposium on Industrial Electronics (ISIE), 342-347 , 2019
    2019
    Citations: 5
  • Development of an automated system to optimize greenhouse resource consumption
    SI Cosman, CA Moldovan, RA Iuşan, C Oprea, CS Marţiş
    2019 8th International Conference on Modern Power Systems (MPS), 1-7 , 2019
    2019
    Citations: 5
  • Design, building and testing of a low voltage-high current drive for SRMs used for HVAC applications
    SI Cosman, VI Boancă, C Oprea, CS Martiş
    2018 International Conference and Exposition on Electrical And Power … , 2018
    2018
    Citations: 6

MOST CITED SCHOLAR PUBLICATIONS

  • Comparative analysis of different synchronous reluctance motor topologies
    C Oprea, A Dziechciarz, C Martis
    2015 IEEE 15th International Conference on Environment and Electrical … , 2015
    2015
    Citations: 63
  • Axial-flux vs. radial-flux permanent-magnet synchronous generators for micro-wind turbine application
    AA Pop, F Jurca, C Oprea, M Chirca, S Breban, MM Radulescu
    2013 15th European Conference on Power Electronics and Applications (EPE), 1-10 , 2013
    2013
    Citations: 57
  • Permanent magnet linear generator for renewable energy applications: Tubular vs. four-sided structures
    CA Oprea, CS Martis, FN Jurca, D Fodorean, L Szabó
    2011 International conference on clean electrical power (ICCEP), 588-592 , 2011
    2011
    Citations: 57
  • Novel permanent magnet tubular linear generator for wave energy converters
    L Szabo, C Oprea, IA Viorel, KÁ Biró
    2007 IEEE International Electric Machines & Drives Conference 2, 983-987 , 2007
    2007
    Citations: 52
  • Wave energy plants for the black sea possible energy converter structures
    L Szabo, C Oprea
    2007 International Conference on Clean Electrical Power, 306-311 , 2007
    2007
    Citations: 37
  • Comparative study on switched reluctance machine based fault-tolerant electrical drive systems
    M Ruba, C Oprea, L Szabo
    2009 IEEE International Electric Machines and Drives Conference, 987-992 , 2009
    2009
    Citations: 32
  • Electrical machines virtual laboratory: Grid connection of a synchronous generator
    CS Martis, HC Hedesiu, L Szabó, B Tataranu, F Jurca, C Oprea
    2006 12th International Power Electronics and Motion Control Conference … , 2006
    2006
    Citations: 30
  • Analysis of innovative design variations for double-sided coreless-stator axial-flux permanent-magnet generators in micro-wind power applications
    M Chirca, S Breban, CA Oprea, MM Radulescu
    2014 International Conference on Electrical Machines (ICEM), 385-389 , 2014
    2014
    Citations: 25
  • Multi-physics design of synchronous reluctance machine for high speed applications
    A Dziechciarz, C Oprea, C Martis
    IECON 2016-42nd Annual Conference of the IEEE Industrial Electronics Society … , 2016
    2016
    Citations: 21
  • Artificial intelligence (AI)-based optimization of power electronic converters for improved power system stability and performance
    IC Gros, X Lü, C Oprea, T Lu, L Pintilie
    2023 IEEE 14th international symposium on diagnostics for electrical … , 2023
    2023
    Citations: 20
  • Design and testing of a four-sided permanent magnet linear generator prototype
    CA Oprea, CS Martis, KA Biro, FN Jurca
    The XIX International Conference on Electrical Machines-ICEM 2010, 1-6 , 2010
    2010
    Citations: 20
  • Fault tolerant permanent magnet synchronous machine for electric power steering systems
    C Oprea, C Martis
    2008 International Symposium on Power Electronics, Electrical Drives … , 2008
    2008
    Citations: 20
  • Comparative design analysis of ferrite-permanent-magnet micro-wind turbine generators
    M Chirca, S Breban, C Oprea, MM Radulescu
    2015 Intl Aegean Conference on Electrical Machines & Power Electronics … , 2015
    2015
    Citations: 17
  • Optimal design of a radial flux spoke-type interior rotor permanent magnet generator for micro-wind turbine applications
    M Chirca, C Oprea, PD Teodosescu, S Breban
    2016 International Conference on Applied and Theoretical Electricity (ICATE … , 2016
    2016
    Citations: 14
  • Experimental tests on a spoke-type permanent magnets synchronous machine for light electric vehicle application
    S Breban, M Dranca, M Chirca, AM Pacuraru, PD Teodosescu, CA Oprea
    Applied Sciences 12 (6), 3019 , 2022
    2022
    Citations: 13
  • Study on a wave energy based power system
    L Szabo, C Oprea, C Festila, E Dulf
    2008 18th International Conference on Electrical Machines, 1-6 , 2008
    2008
    Citations: 13
  • Linear permanent magnet electric generator for free piston engine applications
    CA Oprea, L Szabó, CS Marţiş
    2012 XXth International Conference on Electrical Machines, 691-696 , 2012
    2012
    Citations: 11
  • Six-phase brushless DC motor for fault tolerant electric power steering systems
    C Oprea, C Martis, B Karoly
    2007 International Aegean Conference on Electrical Machines and Power … , 2007
    2007
    Citations: 11
  • Structural and modal analysis in Solidworks of agricultural plow to choose vibration system at moldboard
    G Gheorghe, D Lates, C Oprea, C Baltatu
    Engineering for Rural Development 22, 872-878 , 2023
    2023
    Citations: 10
  • PMSM evaluation for electric drive train for L6e light electric vehicles
    M Chirca, MA Dranca, S Breban, CA Oprea
    2020 International Conference and Exposition on Electrical And Power … , 2020
    2020
    Citations: 9