Nimananda Sharma, Elektroteknik

​Titel på avhandlingen: Design, Modelling and Verification of Distributed Electric Drivetrain


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The seminar can be accessed through Zoom, and it will open shortly before 13:30. We would kindly ask you to keep the video off and mute the microphone during the seminar. At the end of the session there will be an opportunity to ask questions through Zoom. In case there will be any updates about the event, these will be posted on this website.

Nimananda Sharma är doktorand vid forskargruppen Elmaskiner och kraftelektronik
Opponent är Professor Pragasen Pillay, Concordia University, Canada
Examinator är Biträdande professor Ola Carlson vid forskargruppen Elnät och komponenter

Sammanfattning

Electric drivetrain in a battery electric vehicle (BEVs) consists of an electric machine, an inverter, and a transmission. The drivetrain topology of available BEVs e.g., Nissan Leaf are centralized with a single electric drivetrain used to propel the vehicle. The drivetrain components can be integrated mechanically resulting into a more compact solution. It allows the possibility to use multiple drivetrain unit to propel the same vehicle resulting into a distributed drive architecture e.g., Tesla Model S. Such distributed drivetrain can provide additional degree of freedom for control and topology optimization which could lead to reduced cost, improved efficiency, and performance.

To reduce the cost, the drivetrain unit in a distributed drivetrain can be standardized. To standardize the drivetrain, they need to be dimensioned such that performance of a range of different vehicles can be satisfied. In this work, a method for dimensioning the torque and power of an electric drivetrain that could be standardized across different passenger and light duty vehicles is investigated. A system modelling approach is used to verify the method using drive cycle simulation. 

The laboratory verification of such drivetrain components using conventional dyno test bench can be expensive. Therefore, alternative methods such as power-hardware-in-the-loop (PHIL) and mechanical-hardware-in-the-loop (MHIL) are investigated. The PHIL test method for verification of inverters can be inexpensive as it eliminates the need for rotating electric machines. In this method, the inverter is tested using a machine emulator which consists of a voltage source converter and a coupling network e.g., inductors, transformer. The emulator is controlled in such a way that currents and voltages at the terminals resemble a machine connected to a mechanical load.  In this work, a 60-kW machine emulator is designed and experimental verified. In MHIL method, the real-time simulation of the system is combined with a dyno test bench. To utilize this method for distributed drivetrain systems, one of the drivetrains is implemented in the dyno test bench while the remaining are simulated using a real-time simulator. By including the remaining drivetrains in the real-time simulation, the need for full scale dyno test bench is eliminated thereby providing a less expensive method for laboratory verification. A MHIL test bench for verification of distributed drivetrain control and components is also designed and experimentally verified.

Kategori Disputation
Plats: EA, lecture hall, Hörsalsvägen 11, EDIT trappa C, D och H
Tid: 2022-08-18 13:30
Sluttid: 2022-08-18 16:30

Sidansvarig Publicerad: on 29 jun 2022.