DC Link Voltage Balancing of the Active Front-End for the Extreme Fast Charging Stations

Moeini, Amirhossein; Kankanala, Sai Hemanth; Kimball, Jonathan W.

doi:10.1109/ecce44975.2020.9236377

DC Link Voltage Balancing of the Active Front-End for the Extreme Fast Charging Stations

Conference · Sun Oct 11 00:00:00 EDT 2020 · 2020 IEEE Energy Conversion Congress and Exposition (ECCE)

DOI:https://doi.org/10.1109/ecce44975.2020.9236377· OSTI ID:1991847

Moeini, Amirhossein ^[1]; Kankanala, Sai Hemanth; Kimball, Jonathan W.

Missouri University of Science and Technology

One of the most important challenges of the extreme fast charging (XFC) stations is to balance the DC link voltages of the active front-end (AFE). The multilevel cascaded H-bridge (CHB) converter is a great topology for the AFE applications due to the high power density, low total harmonic distortion (THD), and a low number of active and passive components. In this paper, a technique is proposed for balancing DC-link capacitor voltages of a three-phase CHB converter, when a phase shiftPWM modulation technique is used on all cells of the converter. To reach this goal, the redundant states of the CHB converters are used for generating different AC voltage levels by sorting the voltages of the converters. The proposed voltage balancing technique uses the principles that are employed for the DC link voltage balancing of the low-frequency modulation techniques to balance the DC link voltages of the CHB converter. As shown in this paper, the DC link voltages of the CHB converter can accurately be balanced very fast without using PI controllers, which are used in the conventional DC link voltage balancing techniques. A controller also is proposed which will be used to control the dq currents of the CHB converter. To verify the advantages of the proposed technique, the simulation results of the proposed technique will be carried out in a three-phase 7-cell CHB AFE.

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Research Organization:: Missouri University of Science and Technology

Sponsoring Organization:: U.S. Department of Energy

DOE Contract Number:: EE0008449

OSTI ID:: 1991847

Journal Information:: 2020 IEEE Energy Conversion Congress and Exposition (ECCE), Journal Name: 2020 IEEE Energy Conversion Congress and Exposition (ECCE)

Country of Publication:: United States

Language:: English

References (17)

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