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Analysis of the DC-Link Voltage Ripple for the Three-Phase Voltage Source Converter under Nonlinear Output Current

Author

Listed:
  • Shan Li

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Lei Yang

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

  • Tao Wang

    (School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China)

Abstract

The dc-link voltage ripple plays an important role in dc capacitor design for three-phase voltage source converters (VSCs). However, the analytical models of the dc-link voltage ripple have rarely been reported for VSCs with nonlinear output current. This paper first derived the LOH voltages expressions in the dc-link. It reveals that each LOH component in ac current would induce two dc-link LOH voltages. Then the switching frequency harmonic voltages (SHVs) and their envelope expressions are formulated. Moreover, the proposed analytical models could be very much simplified when applied to special cases in the previous literature. Finally, an easy to design dc capacitor equation under nonlinear output current is also derived. Both simulation and experimental results validate the proposed method.

Suggested Citation

  • Shan Li & Lei Yang & Tao Wang, 2022. "Analysis of the DC-Link Voltage Ripple for the Three-Phase Voltage Source Converter under Nonlinear Output Current," Energies, MDPI, vol. 15(8), pages 1-15, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:8:p:2892-:d:794180
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    References listed on IDEAS

    as
    1. Marija Vujacic & Manel Hammami & Milan Srndovic & Gabriele Grandi, 2018. "Analysis of dc-Link Voltage Switching Ripple in Three-Phase PWM Inverters," Energies, MDPI, vol. 11(2), pages 1-14, February.
    2. Marija Vujacic & Manel Hammami & Milan Srndovic & Gabriele Grandi, 2017. "Theoretical and Experimental Investigation of Switching Ripple in the DC-Link Voltage of Single-Phase H-Bridge PWM Inverters," Energies, MDPI, vol. 10(8), pages 1-16, August.
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