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Energies 2018, 11(5), 1195; https://doi.org/10.3390/en11051195

Electric Vehicle Fast-Charging Station Unified Modeling and Stability Analysis in the dq Frame

School of Electric Engineering, Southwest Jiaotong University, Chengdu 611756, China
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Received: 9 April 2018 / Revised: 27 April 2018 / Accepted: 7 May 2018 / Published: 8 May 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

The electric vehicle fast-charging station is an important guarantee for the popularity of electric vehicle. As the fast-charging piles are voltage source converters, stability issues will occur in the grid-connected fast-charging station. Since the dynamic input admittance of the fast-charging pile and the dynamic output impedance play an important role in the interaction system stability, the station and grid interaction system is regarded as load-side and source-side sub-systems to build the dynamic impedance model. The dynamic input admittance in matrix form is derived from the fast-charging pile current control loop considering the influence of the LC filter. Similarly, the dynamic output impedance can be obtained similarly by considering the regional power grid capacity, transformer capacity, and feed line length. On this basis, a modified forbidden region-based stability criterion is used for the fast-charging station stability analysis. The frequency-domain case studies and time-domain simulations are presented next to show the influence of factors from both the power grid side and fast-charging pile side. The simulation results validated the effectiveness of the dq frame impedance model and the stability analysis method. View Full-Text
Keywords: grid; fast-charging station; interaction stability; current control loop; impedance modeling; input admittance model; output impedance model; stability criterion grid; fast-charging station; interaction stability; current control loop; impedance modeling; input admittance model; output impedance model; stability criterion
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Wang, X.; He, Z.; Yang, J. Electric Vehicle Fast-Charging Station Unified Modeling and Stability Analysis in the dq Frame. Energies 2018, 11, 1195.

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