Open AccessA control strategy to enhance the life time of the battery in a stand‐alone PV system with DC loads
Author(s) -
Maheswari Lakshmanan,
Srinivasa Rao P.,
Sivakumaran N.,
Saravana Ilango G.,
Nagamani Chilakapati
Publication year - 2017
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.2016.0735
Subject(s) - battery (electricity) , supercapacitor , photovoltaic system , voltage , converters , power (physics) , constant current , capacitor , automotive engineering , trickle charging , computer science , electrical engineering , energy storage , engineering , capacitance , physics , electrode , quantum mechanics
This study proposes a unique control strategy to enhance the life time of the battery in a stand‐alone photovoltaic (PV) system employing energy storage devices such as battery and super capacitor. The intermittent fluctuations in PV power and load power affect the DC bus voltage leading to a random and frequent charging/discharging profile of the battery since the controlling converters are operated as constant voltage sources. To overcome this drawback, the supercapacitor converter is commanded as a constant voltage source so as to adapt to varying load conditions and the battery converter is commanded as a constant current source. This strategy helps to decouple the power imbalances from the charge–discharge profile of battery, thereby contributing to the improved battery life. The detailed experimental results are presented. Further, the proposed control strategy is tested and validated under various scenarios.