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Ketchedjian, M.Sc., Vasken

Vasken Ketchedjian, M.Sc.

Research associate
Institute for Power Electronics and Electrical Drives

Contact

+49 711 685 67385
+49 711 685 67378
Email

Pfaffenwaldring 47
70569 Stuttgart
Deutschland
Room: 0.250, ETI 1

Office Hours

Only with an appointment

Publications

2023
1. Ketchedjian, V., Haspel, A., Schuster, J., & Roth-Stielow, J. (2023). Modeling of the Drive Train and Energy Management Strategy for a Hybrid Midsize Multifunctional Vehicle. PCIM Europe 2023; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, 1–10. https://ieeexplore.ieee.org/document/10173236
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  @inproceedings{10173236, abstract = {This paper presents a modular design of the drive train of a hybrid midsize multifunctional vehicle. The model is mainly based on the loss calculation of the electrical components of the drive train, which is the focus of this paper. Moreover, the torque distribution over the wheels, the power flow through the electrical and electromechanical components, as well as the battery capacity, which are necessary for the design of the drive train, is also discussed. Finally, the different strategies, which are used for the energy management within the drive train and for the control of the converters, are introduced.}, author = {Ketchedjian, Vasken and Haspel, Andre and Schuster, Johannes and Roth-Stielow, Joerg}, booktitle = {PCIM Europe 2023; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management}, month = {05}, pages = {1-10}, title = {Modeling of the Drive Train and Energy Management Strategy for a Hybrid Midsize Multifunctional Vehicle}, url = {https://ieeexplore.ieee.org/document/10173236}, year = 2023 }
  Link
  https://ieeexplore.ieee.org/document/10173236
2. Haspel, A., Ketchedjian, V., Kirschner, M., & Roth-Stielow, J. (2023). Impacts of Cross-Saturation on Sensorless Control of Synchronous Machines using Alternating Signal Injection. PCIM Europe 2023; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, 1–10. https://ieeexplore.ieee.org/document/10173451
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  @inproceedings{10173451, abstract = {Signal injection is a well-known technique to identify the actual rotor position of an AC machine in lowspeed and standstill using the saliency of the machine. It enables a field-oriented control without a position sensor. This paper discusses the disturbing influence of magnetic cross-saturation on the estimated rotor position of an interior permanent magnet synchronous machine and presents two possibilities to compensate the errors caused by this influence. Simulation models are used to demonstrate and analyze the position deviation caused by the saturation effects and to evaluate the effectiveness of the proposed compensation methods. Several measurements on a machine testbench validate the simulation results.}, author = {Haspel, André and Ketchedjian, Vasken and Kirschner, Marcel and Roth-Stielow, Joerg}, booktitle = {PCIM Europe 2023; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management}, month = {05}, pages = {1-10}, title = {Impacts of Cross-Saturation on Sensorless Control of Synchronous Machines using Alternating Signal Injection}, url = {https://ieeexplore.ieee.org/document/10173451}, year = 2023 }
  Link
  https://ieeexplore.ieee.org/document/10173451
3. Haspel, A., Kaiser, K., Ketchedjian, V., & Roth-Stielow, J. (2023). Harmonic Current Controller Design for Anisotropic Synchronous Machines based on a Machine Model in Harmonic Reference Frame. 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia), 2979–2986. https://ieeexplore.ieee.org/document/10213689
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  @inproceedings{10213689, abstract = {This paper proposes a novel controller design for harmonic current control of synchronous machines based on a plant model in a harmonic reference frame. The modeling in the harmonic reference frame exposes additional harmonic couplings in the plant's transfer function, caused by the different inductances in the direct- and quadrature-axis of the rotor. These effects disturb conventional harmonic controllers. Therefore, the proposed controller uses an inverse plant model including the additional harmonic couplings, to achieve the desired stationary and dynamic behavior. The implementation of the novel harmonic controller, simulations and experimental results are presented for a permanent magnet assisted synchronous reluctance machine.}, author = {Haspel, André and Kaiser, Kim and Ketchedjian, Vasken and Roth-Stielow, Jörg}, booktitle = {2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)}, issn = {2150-6086}, month = {05}, pages = {2979-2986}, title = {Harmonic Current Controller Design for Anisotropic Synchronous Machines based on a Machine Model in Harmonic Reference Frame}, url = {https://ieeexplore.ieee.org/document/10213689}, year = 2023 }
  Link
  https://ieeexplore.ieee.org/document/10213689
4. Haspel, A., Ketchedjian, V., Marx, P., Eckstein, M., & Roth-Stielow, J. (2023). Composition of the Countervoltage for Power-Hardware-in-the-Loop Emulators for Three-Phase Machines. 2023 25th European Conference on Power Electronics and Applications (EPE’23 ECCE Europe), 1–10. https://ieeexplore.ieee.org/document/10264532
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  @inproceedings{10264532, abstract = {To emulate the reaction of an electrical machine interacting with a device-under-test inverter, a power-hardware-in-the-loop emulator has to provide a suitable countervoltage per phase. For the correct emulation of the dynamic electrical behavior of the machine, especially the current ripple, the countervoltage has to include a steady oscillating component and a stepwise changing component. This paper introduces a novel approach to determine the analytically ideal shape of the countervoltage for the emulation of three-phase machines and provides a simulative validation. As example, a synchronous machine operated with a two-level voltage source inverter is regarded. It is shown that the relation between the machine’s direct and quadrature inductances as well as the coupling between the device-under-test inverter and the emulator have a significant influence on the shape of the countervoltage.}, author = {Haspel, André and Ketchedjian, Vasken and Marx, Philipp and Eckstein, Mattea and Roth-Stielow, Jörg}, booktitle = {2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe)}, month = {09}, pages = {1-10}, title = {Composition of the Countervoltage for Power-Hardware-in-the-Loop Emulators for Three-Phase Machines}, url = {https://ieeexplore.ieee.org/document/10264532}, year = 2023 }
  Link
  https://ieeexplore.ieee.org/document/10264532
2022
1. Ketchedjian, V., Haspel, A., Haarer, J., & Roth-Stielow, J. (2022). An Open-Loop Control for the Determination of the MTPV-Trajectory of a SynRM. In IEEE (Ed.), 2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia) (pp. 2714–2720). https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9806916
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  @inproceedings{9806916, abstract = {In this paper an open-loop control for the measurement of the maximum torque per volt (MTPV)-trajectory for a synchronous reluctance machine (SynRM) is proposed. This method requires a minimum number of measurement parameter to determine the MTPV-trajectory without any previous knowledge of the inductances and its saturation effects. The proposed method is an open-loop control which is based on the same principle of measurement as the maximum torque per ampere (MTPA)-trajectory and can be easily implemented on a test bench. The functionality of the open-loop control is first tested using the simulation tool Matlab-Simulink. Then the open-loop control is implemented on an existing test bench to verify its functionality experimentally and compare the obtained simulation results with the measurement results.}, author = {Ketchedjian, Vasken and Haspel, André and Haarer, Jörg and Roth-Stielow, Jörg}, booktitle = {2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)}, editor = {IEEE}, month = {05}, pages = {2714-2720}, title = {An Open-Loop Control for the Determination of the MTPV-Trajectory of a SynRM}, url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9806916}, year = 2022 }
  Link
  https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9806916
2021
1. Ketchedjian, V., Fischer, M., Nitzsche, M., & Roth-Stielow, J. (2021). Two Torque Control Algorithms of a Synchronous Reluctance Motor Drive for the Entire Operating Speed Range. 2021 23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe), P.1-P.9. https://ieeexplore.ieee.org/document/9570426
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  @inproceedings{9570426, abstract = {In this paper, two new algorithms for the torque control of a synchronous reluctance machine (SynRM) are proposed. The control system is set for the entire operating speed range, whereas the transition from the base speed range into the field weakening region will be the main focus of this paper. The switching strategies in the transitions phase of the two methods are also discussed using different conditions. These control strategies are evaluated using Matlab Simulink as a simulation tool followed by measurement results on an existing test bench.}, author = {Ketchedjian, Vasken and Fischer, Manuel and Nitzsche, Maximilian and Roth-Stielow, Jörg}, booktitle = {2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)}, month = {09}, pages = {P.1-P.9}, title = {Two Torque Control Algorithms of a Synchronous Reluctance Motor Drive for the Entire Operating Speed Range}, url = {https://ieeexplore.ieee.org/document/9570426}, year = 2021 }
  Link
  https://ieeexplore.ieee.org/document/9570426
2020
1. Fischer, M., Ruthardt, J., Ketchedjian, V., Ziegler, P., Nitzsche, M., & Roth-Stielow, J. (2020). Four-Level Inverter with Variable Voltage Levels for Hardware-in-the-Loop Emulation of Three-Phase Machines. 2020 22nd European Conference on Power Electronics and Applications (EPE’20 ECCE Europe), P.1-P.8. https://ieeexplore.ieee.org/document/9215767
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  @inproceedings{9215767, abstract = {In order to emulate the behavior of three-phase machines in a hardware-in-the-loop test bench, an applicable power electronic device is required. For this purpose, an inverter concept with four variable voltage levels per phase is presented. This concept precisely fulfills the requirements of three-phase machine emulation. The presented inverter is theoretically able to adjust the ideal countervoltage course which is needed to emulate three-phase machines' electrical behavior. In contrast, the countervoltages of commonly used power electronic devices suffer from deviation caused by switched-mode operation or limited bandwidth. Within this paper the setup of the four-level inverter is presented. Besides, the paper discusses a control strategy for operating the four-level inverter as a three-phase machine emulator.}, author = {{Fischer}, M. and {Ruthardt}, J. and {Ketchedjian}, V. and {Ziegler}, P. and {Nitzsche}, M. and {Roth-Stielow}, J.}, booktitle = {2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)}, month = {09}, pages = {P.1-P.8}, title = {Four-Level Inverter with Variable Voltage Levels for Hardware-in-the-Loop Emulation of Three-Phase Machines}, url = {https://ieeexplore.ieee.org/document/9215767}, year = 2020 }
  Link
  https://ieeexplore.ieee.org/document/9215767
2. Nitzsche, M., Haarer, J., Ketchedjian, V., & Roth-Stielow, J. (2020). Design of a 9-Level Flying Capacitor Inverter with Very Fast Response of the Controller. IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society, 2424–2429. https://doi.org/10.1109/IECON43393.2020.9254392
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  @inproceedings{9254392, abstract = {With the increasing utilization of wide bandgap materials in power electronics such as silicon carbide (SiC) and gallium nitride (GaN), high voltage GaN transistors step into focus. However, low voltage GaN transistors have been on the market much longer and offer several advantages. The flying-capacitor multilevel converter topology enables these advantages and therefore makes system designs with highest power density and low volume possible. These characteristics are key-factors for penetration of products with wide bandgap materials into industrial electronics markets. This work presents a 9-level flying capacitor DC-AC inverter. Zero voltage switching (ZVS) greatly reduces switching losses, thereby enables high frequency operation of the inverter and consequently enhances efficiency. The implemented hardware is designed for an output power of 200Watt and the prototype is built on a modular platform around an FPGA based control system. The modulation scheme and control system allow for extremely high effective switching frequencies and very fast response. Experimental results demonstrate a peak efficiency above 99.0% and an effective switching frequency of up to 4MHz.}, author = {Nitzsche, M. and Haarer, J. and Ketchedjian, V. and Roth-Stielow, J.}, booktitle = {IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society}, doi = {10.1109/IECON43393.2020.9254392}, issn = {2577-1647}, month = {10}, pages = {2424-2429}, title = {Design of a 9-Level Flying Capacitor Inverter with Very Fast Response of the Controller}, url = {https://ieeexplore.ieee.org/document/9254392}, year = 2020 }
  Link
  https://ieeexplore.ieee.org/document/9254392
2019
1. Bintz, S., Häfele, D., Ketchedjian, V., & Roth-Stielow, J. (2019). Parallel-Serial-Rectifier for Power-to-Hydrogen Applications. 2019 21st European Conference on Power Electronics and Applications (EPE ’19 ECCE Europe), P.1-P.11. https://doi.org/10.23919/EPE.2019.8915526
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  @inproceedings{8915526, abstract = {This paper presents a new rectifier topology for energy storage utilizing electrolysis in low voltage power grids without the typically needed isolation transformer. The proposed concept uses a voltage addition to pre-shape the input voltage of the rectifier to obtain a smoothed output voltage. At the grid connection, a current addition is designated to provide a good power factor. The power electronic concept as well as its control strategy have been developed and adapted according to power quality and efficiency. The rectifier concept is proven by simulation and measurements on a kilowatt-scale demonstrator.}, address = {Genova, Italy}, author = {Bintz, Steffen and Häfele, Daniel and Ketchedjian, Vasken and Roth-Stielow, Jörg}, booktitle = {2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)}, doi = {10.23919/EPE.2019.8915526}, eventdate = {9/3/2019 - 9/5/2019}, language = {English}, month = {09}, pages = {P.1-P.11}, title = {Parallel-Serial-Rectifier for Power-to-Hydrogen Applications}, url = {https://ieeexplore.ieee.org/document/8915526/}, year = 2019 }
  Link
  https://ieeexplore.ieee.org/document/8915526/
2018
1. Schuster, J., Ketchedjian, V., & Roth-Stielow, J. (2018). Sensorless Position Estimation for an Externally Excited Synchronous Machine over the Whole Speed Range. In S. Mesago PCIM GmbH (Ed.), International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management Proceedings (PCIM) (pp. 1192–1198). VDE.
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  @inproceedings{schuster2018sensorless, author = {Schuster, Johannes and Ketchedjian, Vasken and Roth-Stielow, Jörg}, booktitle = {International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management Proceedings (PCIM)}, editor = {Mesago PCIM GmbH, Stuttgart}, isbn = {ISBN 978-3-8007-4646-0}, month = {06}, pages = {1192-1198}, publisher = {VDE}, title = {Sensorless Position Estimation for an Externally Excited Synchronous Machine over the Whole Speed Range}, year = 2018 }
2017
1. Schuster, J., Ketchedjian, V., & Roth-Stielow, J. (2017, September). Sensorless position estimation at low speeds till standstill with reduced filtering requirements for an externally exited synchronous machine. 2017 IEEE International Symposium on Sensorless Control for Electrical Drives (SLED). https://doi.org/10.1109/sled.2017.8078422
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  @inproceedings{SLED_Schuster_2017, author = {Schuster, Johannes and Ketchedjian, Vasken and Roth-Stielow, Jorg}, booktitle = {2017 {IEEE} International Symposium on Sensorless Control for Electrical Drives ({SLED})}, doi = {10.1109/sled.2017.8078422}, month = {09}, publisher = {{IEEE}}, title = {Sensorless position estimation at low speeds till standstill with reduced filtering requirements for an externally exited synchronous machine}, url = {https://doi.org/10.1109%2Fsled.2017.8078422}, year = 2017 }
  Link
  https://doi.org/10.1109%2Fsled.2017.8078422

ORCID

orcid.org/0000-0001-7702-2660

Vasken Ketchedjian, M.Sc.

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2023

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Vasken Ketchedjian, M.Sc.

Contact

Office Hours

Publications

2023

BibTeX

Link

BibTeX

Link

BibTeX

Link

BibTeX

Link

2022

BibTeX

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2021

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2020

BibTeX

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BibTeX

Link

2019

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2018

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2017

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