Open AccessComprehensive dynamic analysis of photovoltaic generator interfacing DC–DC boost power stage
Author(s) -
Viinamäki J.,
Jokipii J.,
Messo T.,
Suntio T.,
Sitbon M.,
Kuperman A.
Publication year - 2015
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2014.0149
Subject(s) - boost converter , maximum power point tracking , duty cycle , buck converter , photovoltaic system , power optimizer , electrical engineering , buck–boost converter , flyback converter , interfacing , computer science , power factor , switched mode power supply , maximum power principle , forward converter , voltage , electronic engineering , engineering , inverter , computer hardware
In transformer‐less grid‐connected renewable energy systems, interfacing of photovoltaic (PV) generators is typically implemented by means of DC–DC boost‐power‐stage converter, mainly because of its voltage‐boosting capability. In order to track the maximum power point of a PV generator, input voltage of the converter is usually feedback controlled, forcing the converter to operate as a current‐sourced rather than voltage‐sourced converter. Nevertheless, PV generator interfacing power stage is commonly assumed to possess the same dynamic properties as corresponding voltage‐sourced power stage. Investigations presented in this study reveal explicitly that the dynamics of PV generator interfacing DC–DC boost power stage resembles conventional buck power stage behaviour with duty‐cycle independent resonance and additional right‐half‐plane zeros. In addition, the duty cycle has to be decreased for increasing the corresponding output variables (i.e. input voltage and output current). Extended experimental results are given to support the theoretical findings.