@mastersthesis{MTMT:32525193, title = {Realistic modeling of power converters}, url = {https://m2.mtmt.hu/api/publication/32525193}, author = {Kökényesi, Tamás}, publisher = {Budapest University of Technology and Economics}, unique-id = {32525193}, year = {2021} } @{MTMT:30706025, title = {Validation Method for Hardware-in-the-Loop Simulation Models}, url = {https://m2.mtmt.hu/api/publication/30706025}, author = {Kökényesi, Tamás and Varjasi, István}, booktitle = {Proceedings of The 9th EUROSIM Congress on Modelling and Simulation, EUROSIM 2016, The 57th SIMS Conference on Simulation and Modelling SIMS 2016}, doi = {10.3384/ecp17142749}, unique-id = {30706025}, abstract = {The advances in FPGA technology have enabled fast real-time simulation of power converters, filters and loads. HIL (Hardware-in-the-Loop) simulators taking advantage of this technology have revolutionized control hardware and software development for power electronics. Switching frequencies in today’s power converters are getting higher and higher, so reducing calculation time steps in HIL simulators is critical, especially if simulating lower power circuits. Faster calculation can be achieved with simpler models or lower resolution. Both possibilities require the validation of the FPGA-synthesizable simulation models to check whether they are correct representations of the simulated main circuit or not. The subject of this paper is a validation method, which treats the simulation error similar as production variance, which can be measured between different instances of the original main circuit.}, year = {2018}, pages = {749-754} } @inproceedings{MTMT:3414939, title = {FPGA-Driven DAC with Second Order Sliding Mode Control of Filter Model for Hardware-In-the-Loop Simulators}, url = {https://m2.mtmt.hu/api/publication/3414939}, author = {Kökényesi, Tamás and Hegedűs, Márton and Veréb, Szabolcs and Balogh, Attila and Sütő, Zoltán and Varjasi, István}, booktitle = {2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)}, doi = {10.1109/epepemc.2018.8521939}, unique-id = {3414939}, year = {2018}, pages = {824-829} } @inproceedings{MTMT:3414938, title = {Application Dependent Optimization of Balancing Methods for Lithium-ion Batteries}, url = {https://m2.mtmt.hu/api/publication/3414938}, author = {Veréb, Szabolcs and Balázs, Gergely György and Kökényesi, Tamás and Sütő, Zoltán and Varjasi, István}, booktitle = {2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)}, doi = {10.1109/epepemc.2018.8521931}, unique-id = {3414938}, year = {2018}, pages = {223-228} } @inproceedings{MTMT:3414805, title = {Multilevel Validation Method for Hardware-in-the-Loop Simulation Models}, url = {https://m2.mtmt.hu/api/publication/3414805}, author = {Kökényesi, Tamás and Sütő, Zoltán and Varjasi, István}, booktitle = {2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)}, unique-id = {3414805}, year = {2018}, pages = {1347-1352} } @article{MTMT:3296944, title = {Real-Time HIL Simulation of the Discontinuous Conduction Mode in Voltage Source PWM Power Converters}, url = {https://m2.mtmt.hu/api/publication/3296944}, author = {Futó, András and Kökényesi, Tamás and Varjasi, István and Sütő, Zoltán and Vajk, István and Balogh, Attila and Gergely, Gyorgy Balazs}, doi = {10.6113/JPE.2017.17.6.1535}, journal-iso = {J POWER ELECTRON}, journal = {JOURNAL OF POWER ELECTRONICS}, volume = {17}, unique-id = {3296944}, issn = {1598-2092}, abstract = {Advances in FPGA technology have enabled fast real-time simulation of power converters, filters and loads. FPGA based HIL (Hardware-In-the-Loop) simulators have revolutionized control hardware and software development for power electronics. Common time step sizes in the order of 100ns are sufficient for simulating switching frequency current and voltage ripples. In order to keep the time step as small as possible, ideal switching function models are often used to simulate the phase legs. This often produces inferior results when simulating the discontinuous conduction mode (DCM) and disabled operational states. Therefore, the corresponding measurement and protection units cannot be tested properly. This paper describes a new solution for this problem utilizing a discrete-time PI controller. The PI controller simulates the proper DC and low frequency AC components of the phase leg voltage during disabled operation. It also retains the advantage of fast real-time execution of switch-based models when an accurate simulation of high frequency junction capacitor oscillations is not necessary.}, year = {2017}, eissn = {2093-4718}, pages = {1535-1544}, orcid-numbers = {Vajk, István/0000-0002-2818-9162} } @inproceedings{MTMT:3176988, title = {Validation Method for Hardware-in-the-Loop Simulation Models}, url = {https://m2.mtmt.hu/api/publication/3176988}, author = {Kökényesi, Tamás and Varjasi, István}, booktitle = {9th EUROSIM Congress on Modelling and Simulation}, unique-id = {3176988}, year = {2016}, pages = {647-652} } @inproceedings{MTMT:3176951, title = {FPGA-synthesizable Filter Model Based Bitstream DAC for Hardware-in-the-Loop Simulators}, url = {https://m2.mtmt.hu/api/publication/3176951}, author = {Kökényesi, Tamás and Durbák, Norbert and Varjasi, István}, booktitle = {21st IMEKO TC-4 International Ssmposium and 19th 4th International Workshop on ADC Modelling and Testing}, unique-id = {3176951}, year = {2016}, pages = {202-207} } @{MTMT:3176937, title = {Method and System for Simulating Inverter Phase Legs During Discontinuous Conduction Mode}, url = {https://m2.mtmt.hu/api/publication/3176937}, author = {Kökényesi, Tamás and Varjasi, István and Debreceni, Tibor and Balázs, Gergely György and Futó, András}, unique-id = {3176937}, year = {2016} } @article{MTMT:3320575, title = {Matlab/Simulink Generated FPGA Based Real-time HIL Simulator and DSP Controller: A Case Study}, url = {https://m2.mtmt.hu/api/publication/3320575}, isbn = {9788461681969}, author = {Sütő, Zoltán and Debreceni, Tibor and Kökényesi, Tamás and Futó, András and Varjasi, István}, doi = {10.24084/repqj12.357}, journal-iso = {RENEWABLE ENERGY & POWER QUALITY J}, journal = {RENEWABLE ENERGY & POWER QUALITY JOURNAL}, volume = {1}, unique-id = {3320575}, year = {2014}, eissn = {2172-038X}, pages = {431-436} }