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

The Korean Institute of Power Electronics (전력전자학회)
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A Study on the DC-Link Miniaturization and the Reduction of Output Current Distortion Rate by Reducing the Effect of 120 Hz Ripple Voltage on Photovoltaic Systems

태양광 발전 시스템의 120Hz 리플 전압 영향 감소를 통한 DC-Link 소형화와 출력 전류 왜곡률 감소에 관한 연구

  • Song, Min-Geun (School of Electronic & Electrical Engineering, Hankyong National University) ;
  • Lee, Woo-Cheol (School of Electronic & Electrical Engineering, Institute for Information Technology Convergence, Hankyong National University)
  • Received : 2021.03.31
  • Accepted : 2021.06.09
  • Published : 2021.10.20
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Abstract

The PV module of solar power systems requires maximum power point tracking (MPPT) technique because the power-voltage and current-voltage characteristics vary depending on the surrounding environment. In addition, the 120 Hz ripple voltage on the DC-Link is caused by the imbalance of the system voltage and current. The effect of this 120 Hz ripple voltage reduces the efficiency of the power generation system by increasing the output current distortion rate. Increasing the capacity of DC-Link can reduce the 120 Hz ripple voltage, but this method is inefficient in price and size. We propose a technique that detects 120 Hz ripple voltage and reduces the effect of ripple voltage without increasing the DC-Link capacity through a controller. The proposed technique was verified through simulations and experiments using a 1 kW single-phase solar power system. In addition, the proposed technique's feasibility was demonstrated by reducing the distortion rate of the output current.

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Acknowledgement

본 연구는 한국전력공사의 2020년 선정 기초연구개발 과제 연구비에 의해 지원되었음. (과제번호: R20XO02-37)

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