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http://dx.doi.org/10.6113/TKPE.2014.19.6.538

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

Ahn, Kyung-Pil (Power Conversion Team, LSIS Co. Ltd)
Lee, YoungIl (Dept. of Electrical and Information Eng., Seoul National University of Sci. and Tech.)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.19, no.6, 2014 , pp. 538-548 More about this Journal
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
Photovoltaic inverter; Grid connected inverter; Robust control; Linear matrix inequality(LMI);
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Times Cited By KSCI : 1  (Citation Analysis)
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