Title
Multi-timescale Modeling of Fast Charging Stations for Power Quality Analysis
Author
Wang, L. (TU Delft DC systems, Energy conversion & Storage) 
Qin, Z. (TU Delft DC systems, Energy conversion & Storage)
Beloqui Larumbe, L. (TU Delft DC systems, Energy conversion & Storage)
Bauer, P. (TU Delft DC systems, Energy conversion & Storage)
Date
2021
Abstract
To accurately simulate the harmonic emission of EV DC fast chargers (DCFCs) and the harmonic voltage of the power grid to which the chargers are connected, a small time-step, i.e., typically smaller than 10μs, is required. However, for harmonic assessment, a long timescale, typically a day, is required. A conflict between accuracy and time efficiency exists. To address this issue, a multitimescale modeling framework of fast charging stations (FCSs) is proposed in this paper. In the presented framework, the DCFCs’ input impedance and harmonic current emission in the ideal grid condition, i.e., the grid impedance is zero and there are no background harmonic voltages, is obtained firstly through a converter switch model with a small timescale. Since the DCFC’s input impedance and harmonic current source change in the charging course, the input impedance and harmonic emission at different input power should be obtained. Then, the DCFCs’ input impedance and harmonic emission will be used in the fast-charging station modeling, where the DCFCs are simplified as their Norton equivalent circuits. In the station level modeling, a bigger time step, i.e., 1 minute, is used, since the DCFCs’ operating power can be assumed as a constant in one minute. With this framework, the FCSs’ long-term power quality performance can be assessed efficiently without neglecting the DCFCs’ small timescale dynamics.
Subject
Charging Infrastructure for EV's
Power quality
Modeling
Harmonics
To reference this document use:
http://resolver.tudelft.nl/uuid:efcf4727-5f29-450d-9971-32d4cd9ba16c
Publisher
IEEE
ISBN
978-1-6654-3384-6
Source
2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe): Proceedings
Event
23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe, 2021-09-06 → 2021-09-10, Virual at Ghent, Belgium
Bibliographical note
Accepted Author Manuscript
Part of collection
Institutional Repository
Document type
conference paper
Rights
© 2021 L. Wang, Z. Qin, L. Beloqui Larumbe, P. Bauer