Open AccessOffset‐free feedback linearisation control of a three‐phase grid‐connected photovoltaic system
Author(s) -
Errouissi Rachid,
AlDurra Ahmed,
Muyeen S.M.
Publication year - 2016
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2015.0961
Subject(s) - control theory (sociology) , photovoltaic system , offset (computer science) , grid , inverter , computer science , controller (irrigation) , pid controller , voltage , engineering , control engineering , control (management) , mathematics , temperature control , agronomy , geometry , electrical engineering , artificial intelligence , biology , programming language
In this study, a state feedback control law is combined with a disturbance observer to enhance disturbance rejection capability of a grid‐connected photovoltaic (PV) inverter. The control law is based on input–output feedback linearisation technique, while the existing disturbance observer is simplified and adopted for the system under investigation. The resulting control law has a proportional–integral (PI)/almost PI–derivative‐like structure, which is convenient for real‐time implementation. The objective of the proposed approach is to improve the DC‐bus voltage regulation, while at the same time control the power exchange between the PV system and the grid. The stability of the closed‐loop system under the composite controller is guaranteed by simple design parameters. Both simulation and experimental results show that the proposed method has significant abilities to initiate fast current control and accurate adjustment of the DC‐bus voltage under model uncertainty and external disturbance.