Modelling and control of a triple-active-bridge converter

This study proposes a systematic approach to model and control a triple-active-bridge (TAB) converter for electric vehicle on-board charger applications. An innovative generalised-harmonic-approximation (GHA) modelling method is proposed to accurately predict the instantaneous current and voltage wa...

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Bibliographic Details
Published in:IET power electronics 2020-04, Vol.13 (5), p.961-969
Main Authors: Zou, Shenli, Lu, Jiangheng, Khaligh, Alireza
Format: Article
Language:English
Subjects:
battery chargers
control method
control strategy
conventional phase‐shift modulation
DC‐DC power convertors
efficiency measurements
electric vehicle on‐board charger applications
electric vehicles
experimental waveforms
extended operating range
generalised‐harmonic‐approximation modelling method
GHA modelling
high conversion efficiency
instantaneous current voltage waveforms
peak efficiency
power 600.0 W
power flow
Research Article
simultaneous charging operation mode
switching convertors
systematic approach
TAB converter
triple‐active‐bridge converter
unbalanced load conditions
zero voltage switching
zero‐voltage switching operation
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Summary:This study proposes a systematic approach to model and control a triple-active-bridge (TAB) converter for electric vehicle on-board charger applications. An innovative generalised-harmonic-approximation (GHA) modelling method is proposed to accurately predict the instantaneous current and voltage waveforms. Based on the GHA modelling, a control strategy for a TAB converter is proposed, which enables the power flow from grid to two batteries with high conversion efficiency while achieving zero-voltage switching operation. Compared to the conventional phase-shift modulation, the proposed control method achieves an extended operating range of simultaneous charging operation mode, especially under the unbalanced load conditions. As a proof-of-concept, a 600 W prototype is built and tested. The experimental results are presented including waveforms of different operation modes and efficiency measurements. The peak efficiency of the TAB converter under the G2B mode is measured as 97.6%. The experimental waveforms exhibit good agreement with the waveforms obtained through GHA modelling.
ISSN:1755-4535
1755-4543
DOI:10.1049/iet-pel.2019.0920