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
Journal article, 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%.

vehicles

inverters

Batteries

multilevel systems

Author

Oskar Theliander

Chalmers, Electrical Engineering, Electric Power Engineering

Anton Kersten

Chalmers, Electrical Engineering, Electric Power Engineering

Manuel Kuder

Bundeswehr University Munich

Weiji Han

Chalmers, Electrical Engineering, Systems and control

Emma Grunditz

Chalmers, Electrical Engineering, Electric Power Engineering

Torbjörn Thiringer

Chalmers, Electrical Engineering, Electric Power Engineering

IEEE Transactions on Industry Applications

0093-9994 (ISSN) 1939-9367 (eISSN)

Vol. 56 6 6968-6977 9206062

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

Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TIA.2020.3026662

More information

Latest update

11/7/2021