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Energies 2014, 7(8), 5425-5443; doi:10.3390/en7085425
Article

Capacity Calculation of Shunt Active Power Filters for Electric Vehicle Charging Stations Based on Harmonic Parameter Estimation and Analytical Modeling

1
, 1,* , 1
, 1
 and 1,2
1 State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China 2 Department of Electrical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
* Author to whom correspondence should be addressed.
Received: 1 July 2014 / Revised: 15 August 2014 / Accepted: 18 August 2014 / Published: 22 August 2014
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Abstract

The influence of electric vehicle charging stations on power grid harmonics is becoming increasingly significant as their presence continues to grow. This paper studies the operational principles of the charging current in the continuous and discontinuous modes for a three-phase uncontrolled rectification charger with a passive power factor correction link, which is affected by the charging power. A parameter estimation method is proposed for the equivalent circuit of the charger by using the measured characteristic AC (Alternating Current) voltage and current data combined with the charging circuit constraints in the conduction process, and this method is verified using an experimental platform. The sensitivity of the current harmonics to the changes in the parameters is analyzed. An analytical harmonic model of the charging station is created by separating the chargers into groups by type. Then, the harmonic current amplification caused by the shunt active power filter is researched, and the analytical formula for the overload factor is derived to further correct the capacity of the shunt active power filter. Finally, this method is validated through a field test of a charging station.
Keywords: electric vehicle charger; charging station; measurement-based modeling; active power filter; harmonic amplification; capacity correction electric vehicle charger; charging station; measurement-based modeling; active power filter; harmonic amplification; capacity correction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Zhou, N.; Wang, J.; Wang, Q.; Wei, N.; Lou, X. Capacity Calculation of Shunt Active Power Filters for Electric Vehicle Charging Stations Based on Harmonic Parameter Estimation and Analytical Modeling. Energies 2014, 7, 5425-5443.

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