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Design of Sliding Mode Observer for Solar Array Current Estimation in the Grid-Connected Photovoltaic System  

Kim IL-Song (한국과학기술원 전자전산학과)
Baik In-Cheol (경기공업대학 컴퓨터응용제어과)
Youn Myung-Joong (한국과학기술원 전자전산학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.10, no.4, 2005 , pp. 411-419 More about this Journal
Abstract
In this paper, a sliding mode observer for solar array current estimation in the photovoltaic power generation system is presented. The solar array current estimation Information is obtained from the sliding mode observer and fed into the maximum power point tracker to update the reference voltage. The parameter values such as inverter dc link capacitances cm be changed up to 50$\%$ from their nominal values and the linear observer can't estimate the correct state values under the parameter variations and noisy environments. The configuration of sliding mode observer is simple, but it shows the robust tracking performance against parameter variations and modeling uncertainties. In this paper, the method for constructing the sliding mode observer using equivalent control input is presented and the convergence of the proposed observer is verified by the Lyapunov method. The mathematical modeling and the experimental results verify the validity of the proposed method.
Keywords
grid-connected photovoltaic system; maximum power point tracker; sliding mode observer;
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