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Robust Control of a Grid Connected Three-Phase Two-Level Photovoltaic Inverter

3상 2레벨 계통연계형 태양광 인버터의 강인제어

  • Ahn, Kyung-Pil (Power Conversion Team, LSIS Co. Ltd) ;
  • Lee, YoungIl (Dept. of Electrical and Information Eng., Seoul National University of Sci. and Tech.)
  • Received : 2014.06.20
  • Accepted : 2014.10.02
  • Published : 2014.12.20

Abstract

This study provides a robust control of a grid-connected three-phase two-level photo voltaic inverter. The introduced control method uses the cascade control strategy to regulate AC-side current and DC-link voltage. A robust controller with integration action is used for the inner-loop AC-side current control, which maximizes the convergence rate using a linear matrix inequality-based optimization design method and eliminates the offset error. The robust controller design method considers the parameter uncertainty set to accommodate parameter mismatch and un-modeled components in the inverter model. An outer-loop proportional-integral controller is used to regulate DC-link voltage with linearization of DC/AC relation. The proposed control strategy is applied to a grid-connected 100 kW photo voltaic inverter.

Keywords

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