MPPT for grid-connected photovoltaic systems using ripple-based Extremum Seeking Control: Analysis and control design issues

Iulian Munteanu (1) , Antoneta Iuliana Bratcu (2)

1 GIPSA-SYSCO - GIPSA - Systèmes non linéaires et complexité
2 GIPSA-SLR - GIPSA - Systèmes linéaires et robustesse

This paper deals with an Extremum Seeking Control MPPT algorithm for grid-connected PV systems without intermediary DC–DC converter stage. The method uses the DC-link voltage ripple as dithering signal, which “naturally” results from the grid inverter operation. A thorough analysis emphasizes the significant variation of system behaviour with the irradiance. Relevant control design guidelines and necessity of an adaptive control approach for fast-changing irradiance tracking emerge from this analysis. MATLAB/Simulink numerical simulations are presented in order to illustrate the closed-loop dynamic performance under various scenarios, which also allows for assessing advantages and limitations of the proposed method.

Mots clés: Photovoltaic systems; Inverter control; Maximum power point tracking (MPPT); Extremum Seeking Control; Ripple correlation control

Domaines: Energie électrique; Automatique / Robotique

Iulian Munteanu, Antoneta Iuliana Bratcu. MPPT for grid-connected photovoltaic systems using ripple-based Extremum Seeking Control: Analysis and control design issues. Solar Energy, 2015, 111, pp.30-42. ⟨10.1016/j.solener.2014.10.027⟩. ⟨hal-01082119⟩