Deadband Voltage Control and Power Buffering for Extreme Fast Charging Station
Abstract
Voltage fluctuation is one of the most common challenges that electric vehicle charging station (EVCS) may introduce to the power grid. Local reactive power compensation (Q-compensation) capability of bi-directional electric vehicle (EV) chargers can mitigate the steady-state voltage violations caused by the EV charging itself or changes in the neighboring loads. Power buffering, using energy storage system (ESS), can be utilized to address the voltage transients (sags and swells) as a result of EV charging at the EVCS. To address PI controller's 'hunting' issue, this paper proposes a Q-sign triggered deadband voltage control (V-control) method at the point of common coupling (PCC). In addition, to ensure the ramp rate of EV charging is within the allowable limits set forth by the grid code, a ramp rate control is proposed that uses the ESS as a 'power buffer'. Lastly, different from most reported work in the literature where no explicit limit of the power electronic converters (PECs) is considered, this work considers a reasonable apparent power capacity limit of the PECs when achieving the V-control. This limit also affects the amount of active power that can be obtained from the grid, and subsequently may require ESS to function as 'load sharing' device to provide supplemental active power to satisfy EV load. A case study simulated in MATLAB (interfaced with PLECS) is presented to demonstrate the effectiveness of the proposed approaches for EVCS operation.
Recommended Citation
W. U. Rehman et al., "Deadband Voltage Control and Power Buffering for Extreme Fast Charging Station," Proceedings of the 2021 IEEE Madrid PowerTech (2021, Madrid, Spain), article no. 9494994, Institute of Electrical and Electronics Engineers (IEEE), Jul 2021.
The definitive version is available at https://doi.org/10.1109/PowerTech46648.2021.9494994
Meeting Name
2021 IEEE Madrid PowerTech, PowerTech 2021 (2021: Jun. 28-Jul. 2, Madrid, Spain)
Department(s)
Electrical and Computer Engineering
International Standard Book Number (ISBN)
978-166543597-0
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2021 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
02 Jul 2021
Comments
This work was supported by the U.S. Department of Energy, under Grant DE-EE0008449.