Open AccessFixed frequency integral sliding‐mode current‐controlled MPPT boost converter for two‐stage PV generation system
Author(s) -
Chinnappan Ravichandran,
Logamani Premalatha,
Ramasubbu Rengaraj
Publication year - 2019
Publication title -
iet circuits, devices and systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.251
H-Index - 49
eISSN - 1751-8598
pISSN - 1751-858X
DOI - 10.1049/iet-cds.2018.5221
Subject(s) - control theory (sociology) , photovoltaic system , maximum power point tracking , controller (irrigation) , inductor , transient response , transient (computer programming) , boost converter , settling time , inverter , voltage controller , capacitor , bang–bang control , voltage , computer science , engineering , voltage source , step response , control engineering , mathematics , electrical engineering , control (management) , artificial intelligence , operating system , mathematical optimization , agronomy , voltage droop , biology , optimal control
In two‐stage grid‐integrated photovoltaic (PV) system, usually a DC–DC converter is employed between the PV modules and the inverter. The dynamic interactions between the DC–DC converter, inverter, and the maximum power point tracking (MPPT) controller may affect the system performances. This study gives an integral procedure to design a stable sliding‐mode controller (SMC) based on fixed frequency equivalent control approach to improve the transient response of PV system and to track the reference voltage supplied by the voltage‐oriented MPPT controller in the presence of environmental and load perturbations and converter output sinusoidal perturbations imposed by the second harmonic of the grid frequency. The controller consists of fast current tracking inner current loop based on SMC law whose sliding surface is defined by the input capacitor and inductor current and outer PI controller maintains required PV voltage regulation. The superiority of the controller is validated at different operating conditions through PSIM software and its performance is compared with variable frequency hysteresis‐based SMC. To check the static and transient performances of the system, various experiments are conducted. The results obtained show very fast transient response in settling time and alleviation of chattering magnitude at various operating conditions.