Output voltage synthesis of a modular battery system based on a cascaded h-bridge multilevel inverter topology for vehicle propulsion: Multilevel pulse width modulation vs. fundamental selective harmonic elimination
Paper in proceeding, 2020

Lately, the research interest for modular battery systems has increased due to the possibility of a better utilization of individual battery packs/cells and the steadily reducing costs of low voltage power electronics. This paper deals with the output voltage synthesis of a modular battery system based on a seven level Cascaded H-bridge (CHB) inverter topology used in a small passenger vehicle. Two methods are considered, Multilevel Pulse Width Modulation (MPWM) and Fundamental Selective Harmonic Elimination (FSHE). Using simulations, the inverter and battery losses, as well as the current THD, are used to assess the effectiveness of both techniques for the broad operating range of a vehicle's drivetrain. It has been shown that FSHE cannot be applied at a modulation index below 0.25, because of the high current THD (> > 5%). Exceeding a modulation index of 0.25, FSHE reduces the battery and inverter losses in comparison to MPWM, while maintaining an acceptable current THD. Operating at higher speeds, FSHE achieves an even better current THD than MPWM. Consequently, it seems reasonable to use a hybrid modulation technique, using MPWM at low and FSHE at higher speeds, respectively. The exact boundary between MPWM and FSHE can vary in accordance with the individual optimization weightings of current THD and drivetrain efficiency.

Inverter

Harmonic Distortion

Space Vector Modulation

Author

Anton Kersten

Chalmers, Electrical Engineering, Electric Power Engineering

Lukas Baum

Student at Chalmers

Weiji Han

Chalmers, Electrical Engineering, Systems and control

Torbjörn Thiringer

Chalmers, Electrical Engineering, Electric Power Engineering

Massimo Bongiorno

Chalmers, Electrical Engineering, Electric Power Engineering

2020 IEEE Transportation Electrification Conference and Expo, ITEC 2020

296-302 9161658

2020 IEEE Transportation Electrification Conference and Expo, ITEC 2020
Chicago, USA,

Loss and EMI reduction in electrified vehicle through the usage of a multilevel converter

Swedish Energy Agency (44807-1), 2017-07-01 -- 2021-12-31.

Areas of Advance

Transport

Energy

Subject Categories

Vehicle Engineering

Electrical Engineering, Electronic Engineering, Information Engineering

Energy Systems

Control Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/ITEC48692.2020.9161658

More information

Latest update

1/3/2024 9