Battery Modeling and Parameter Extraction for Drive Cycle Loss Evaluation of a Modular Battery System for Vehicles Based on a Cascaded H-Bridge Multilevel Inverter
Artikel i vetenskaplig tidskrift, 2020

This article deals with the modeling and the parameterization of the battery packs used in cascaded H-bridge multilevel propulsion inverters. Since the battery packs are intermittently conducting the motor currents, the battery cells are stressed with a dynamic current containing a substantial amount of low-order harmonic components up to a couple of kHz, which is a major difference in comparison to a traditional two-level inverter drive. Different models, such as pure resistive and dynamic RC -networks, are considered to model the energy losses for different operating points (OPs) and driving cycles. Using a small-scale setup, the models’ parameters are extracted using both a low-frequency, pulsed current, and an electrochemical impedance spectroscopy (EIS) sweep. The models are compared against measurements conducted on the small-scale setup at different OPs. Additionally, a drive cycle loss comparison is simulated. The simple resistive model overestimates the losses by about 20% and is, thus, not suitable. The dynamic three-time-constant model, parameterized by a pulsed current, complies with the measurements for all analyzed OPs, especially at low speed, with a maximum deviation of 3.8%. Extracting the parameters using an EIS seems suitable for higher speeds, though the losses for the chosen OPs are underestimated by 1.5%–7.9%.

Batteries

vehicles

multilevel systems

inverters

Författare

Oskar Theliander

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Anton Kersten

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Manuel Kuder

Universität Der Bundeswehr München

Weiji Han

Chalmers, Elektroteknik, System- och reglerteknik, Reglerteknik

Emma Grunditz

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Torbjörn Thiringer

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

IEEE Transactions on Industry Applications

0093-9994 (ISSN)

Vol. 56 6 6968-6977 9206062

Styrkeområden

Energi

Ämneskategorier

Annan fysik

Farkostteknik

Annan elektroteknik och elektronik

DOI

10.1109/TIA.2020.3026662

Mer information

Senast uppdaterat

2021-01-05