Multi-level Inverters can potentially increase the efficiency and power ratings of the drivetrain in electric vehicles and is thus receiving more attention in the electromobility industry. Among multi-level topologies, the T-type inverter has the least components and can be operated both in two-level and three-level modes.
The Task for the student: a) Literature review on the control and modulation techniques for drive systems with multi-level inverters; b) Understand the advantages and limitations of those techniques; c) Establish a control and modulation scheme that ensures stable and efficient operation for the entire operation range. More specifically, the following aspects should be considered: 1) The inverter operates with 800 V dc-link voltage with maximum 600 A rms phase current and up to 20 kHz switching frequency. 2) The machine rotational speeds range from standstill to severalfold of the base speed in field weakening operations; 3) Compare the losses/efficiencies of the two- and three-level operation modes at varies operating points.
Required prior knowledge: Fundamentals about power electronics, pulse width modulation, linear control.
Required software skill: MATLAB/Simulink or PLECS
Bearbeiter: Mustafa Fakhry
Betreuer: Yang Qifan
Verantwortlicher: Prof. Dr.-Ing. Martin März