Implementation of Hybrid PWM with Smooth Transitions between Modulation Modes for Railway Traction Field-Oriented Control System

2023 IEEE 64th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON 2023): Conference Proceedings 2023
Vsevolod Burenin, Jaroslavs Zarembo, Genādijs Kobenkins, Oskars Krievs

High-power medium voltage frequency converters used in railway applications are typically operated at low switching frequency to minimize IGBT switching losses and maintain junction temperature within acceptable limits. Simultaneously, these converters require minimal harmonic distortion of the stator current, as high harmonic content adds additional losses in the induction motor. Achieving that requires specialized pulse-width modulation (PWM) techniques like selective harmonic elimination (SHE) PWM. Combining SHEPWM with closed-loop vector control for high dynamic operation typically involves an observer, however observers underperform at low frequencies. In order to address this issue, the paper proposes a field-oriented control (FOC) method with a hybrid PWM. The main feature of this novel approach lies in the fact that it utilizes both current model and observer, ensuring smooth transitions between modulation regimes. Validation tests on a downscaled laboratory setup have demonstrated its performance in steady-state and transient conditions.

Keywords
selective harmonic elimination, hybrid PWM, hardware-in-the-loop, hybrid observer, railway application, medium-voltage drive, field-oriented control
DOI
10.1109/RTUCON60080.2023.10412888
Hyperlink
https://ieeexplore.ieee.org/document/10412888

Burenin, V., Zarembo, J., Kobenkins, G., Krievs, O. Implementation of Hybrid PWM with Smooth Transitions between Modulation Modes for Railway Traction Field-Oriented Control System. In: 2023 IEEE 64th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON 2023): Conference Proceedings, Latvia, Riga, 9-11 October, 2023. Piscataway: IEEE, 2023, pp.1-7. ISBN 979-8-3503-1772-5. e-ISBN 979-8-3503-1773-2. Available from: doi:10.1109/RTUCON60080.2023.10412888

Publication language
English (en)