Multi-Machine Traction Drive Based on Parallel-Connected Permanent Magnet Synchronous Machines Integrated with Regulating Differential Mechanisms: Topology and Control
SAE-PP-00180
09/17/2021
- Content
- To improve dynamic performance and energy efficiency of railway vehicles, this paper investigates a new single-converter traction-drive system, in which both tractive and braking efforts of each wheel-axle can be controlled by an individual traction Permanent Magnet Synchronous Machine (PMSM). As the speed of each wheel-axle may differ from the others, an electrically controlled differential mechanism is put forward based on a servo-controlled epicyclic gear train which is added to each wheelset drive, removing the speed differences among the paralleled PMSMs. Besides, a cascaded controller is developed for the shared converter, regulating the speeds and the torques of parallel connected PMSMs. The reference voltages of the shared converter are extracted from the reference currents of the traction machines, through an intended collective current controller which works based on a suggested deadbeat predictive control method. Furthermore, to neutralize parameters mismatch and uncertainties in the system model used in the current controller, the reference currents of each PMSM are obtained separately by using a proposed sliding mode control scheme, in an individual speed control loop. Through these suggestions, the transient response of the drive controller can be improved during critical situations, especially under low adhesion conditions and in regenerative braking. Moreover, since all traction PMSMs in each bogie can be controlled by a shared converter, both volume and weight of rail-wagon can be reduced, and the installation costs be lowered. The accuracy and the robustness of the proposed multi-machine traction drive and its controller are demonstrated by both simulations and experimental results.
- Citation
- Mohammadi Pirouz, H., "Multi-Machine Traction Drive Based on Parallel-Connected Permanent Magnet Synchronous Machines Integrated with Regulating Differential Mechanisms: Topology and Control," SAE MobilityRxiv™ Preprint, submitted September 17, 2021, https://doi.org/10.47953/SAE-PP-00180.