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

  • 제20권2호
  • /
  • Pages.152-159
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  • 2015
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  • 1229-2214(pISSN)
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  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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PQ변동을 이용한 개선된 계통 임피던스 추정기법

An Improved Grid Impedance Estimation using PQ Variations

  • Cho, Je-Hee (Dept. of Electrical Eng., EECS lab., Hanyang University) ;
  • Kim, Yong-Wook (Dept. of Electrical Eng., EECS lab., Hanyang University) ;
  • Kim, Rae-Young (Dept. of Electrical and Biomedical Eng., Hanyang University)
  • 투고 : 2014.07.17
  • 심사 : 2015.03.04
  • 발행 : 2015.04.20
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초록

In a weak grid condition, the precise grid impedance estimation is essential to guaranteeing the high performance current control and power transfer for a grid-connected inverter. This study proposes a precise estimation method for grid impedance by PQ variations by employing the variation method of reference currents. The operation principle of grid impedance estimation is fully presented, and the negative impact of the phase locked loop is analyzed. Estimation error by a synchronization angle in the park's transformation using the phase locked loop is derived. As a result, the variation method of reference currents for accurate estimation is introduced. The validation of the proposed method is verified through several simulation results and experiments based on a 2-kW voltage source inverter prototype.

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참고문헌

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