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 i 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.

Space Vector Modulation

Inverter

Harmonic Distortion

Författare

Anton Kersten

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Lukas Baum

Student vid Chalmers

Weiji Han

Chalmers, Elektroteknik, System- och reglerteknik, Reglerteknik

Torbjörn Thiringer

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Massimo Bongiorno

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

2020 IEEE Transportation Electrification Conference and Expo, ITEC 2020

Vol. June 2020 296-302 9161658

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

Ämneskategorier

Annan kemiteknik

Farkostteknik

Annan elektroteknik och elektronik

DOI

10.1109/ITEC48692.2020.9161658

Mer information

Senast uppdaterat

2021-01-05