Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Robust Control of a Grid Connected Three-Phase Two-Level Photovoltaic Inverter
Authors Kyung-Pil Ahn and YoungIl Lee ;
DOI 10.6113/TKPE/2014.19.6.538
Page pp.538-548
ISSN 1229-2214
Keywords Photovoltaic inverter; Grid connected inverter; Robust control; Linear matrix inequality(LMI)
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.