The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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DC-Link Voltage Ripple Analysis of Minimum Loss Discontinuous PWM Strategy in Two-Level Three-Phase Voltage Source Inverters

최소 손실 불연속 변조 기법에 따른 2레벨 3상 전압원 인버터의 직류단 전압 맥동 분석

  • Lee, Junhyuk (School of Electrical and Electronic Engineering, Yonsei University) ;
  • Park, Jung-Wook (School of Electrical and Electronic Engineering, Yonsei University)
  • Received : 2020.11.23
  • Accepted : 2021.01.12
  • Published : 2021.04.20
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Abstract

DC-link capacitors are one of the main components in two-level three-phase voltage source inverters (VSIs); they provide the pulsating input current and stabilize the vacillating DC-link voltage. Ideally, the larger the capacitance of DC-link capacitors, the better the DC-link voltage stabilizes. However, high capacitance increases the cost and decreases the power density of VSI systems. Therefore, the capacitance should be chosen carefully on the basis of the DC-link voltage ripple requirement. However, the DC-link voltage ripple is dependent on the pulse-width modulation (PWM) strategy. This study especially presents a DC-link voltage ripple analysis when the minimum loss discontinuous PWM strategy is applied. Furthermore, an equation for the selection of the minimum capacitance of DC-link capacitors is proposed. Experimental results with R-L loads are also provided to verify the effectiveness of the presented analysis.

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References

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