A robust model-free controller for a three-phase grid-connected photovoltaic system based on ultra-local model

Protection and Control of Modern Power Systems

Sid-Ahmed Touil¹  Salim Labiod²  Ahsene Boubakir²  Nasserdine Boudjerda³ 

[1] Department of Electrical Engineering, University of Jijel, Jijel, Algeria;LAJ, Faculty of Science and Technology, University of Jijel, BP. 98, Ouled Aissa, 18000, Jijel, Algeria;LER, Faculty of Sciences and Technology, University of Jijel, BP 98, Ouled Aissa, 18000, Jijel, Algeria;

关键词: Photovoltaic system;    Maximum power point;    Model-free control;    Ultra-local model;    Numerical differentiator;   

DOI  :  10.1186/s41601-021-00218-7

来源: Springer

【 摘 要 】

In this paper, a robust model-free controller for a grid-connected photovoltaic (PV) system is designed. The system consists of a PV generator connected to a three-phase grid by a DC/AC converter. The control objectives of the overall system are to extract maximum power from the PV source, to control reactive power exchange and to improve the quality of the current injected into the grid. The model-free control technique is based on the use of an ultra-local model instead of the dynamic model of the overall system. The local model is continuously updated based on a numerical differentiator using only the input–output behavior of the controlled system. The model-free controller consists of a classical feedback controller and a compensator for the effects of internal parameter changes and external disturbances. Simulation results illustrate the efficiency of the controller for grid-connected PV systems.

【 授权许可】

CC BY