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

The Korean Institute of Power Electronics (전력전자학회)
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DC-link Voltage Control of Grid Connected PV System using Quasi Z-Source Inverter

QZSI를 이용한 계통연계형 태양광발전 시스템의 직류단 전압제어

  • Park, Jong-Hyoung (Power Grid Integration Team, Power &Industrial Systems R&D Center, Hyosung Co., LTD.) ;
  • Kim, Heung-Geun (Dept. of Electrical Engineering, Kyungpook Nat'l Univ.) ;
  • Nho, Eui-Cheol (Dept. of Electrical Engineering, Pukyong Nat'l Univ.) ;
  • Chun, Tae-Won (Dept. of Electrical Engineering, University of Ulsan) ;
  • Cha, Honnyong (School of Energy Engineering, Kyungpook Nat'l Univ.)
  • Received : 2013.06.05
  • Accepted : 2014.02.18
  • Published : 2014.06.20
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Abstract

In this paper, dc-link voltage control of a grid-connected QZSI is presented. Since the input current of the ZSI is discontinuous, a capacity with relatively large capacitance should be connected to the output of the PV array in order to reduce the current ripple. Due to the presence of the impedance network inductor in series with the PV array, the QZSI can achieve continuous input current flow. Several dc-link voltage control methods are compared and the method for power quality improvement is also presented. The performance of the proposed method is verified through both simulation and experimental results.

Keywords

References

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