Open AccessMulti‐input high step‐up inverter with soft‐switching capability, applicable in photovoltaic systems
Author(s) -
Babaei Ebrahim,
Tarzamni Hadi,
Tahami Farzad,
Jahan Hossein Khoun,
Sharifian Mohammad Bagher Bannae
Publication year - 2020
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.2018.5801
Subject(s) - inverter , pulse width modulation , maximum power point tracking , photovoltaic system , control theory (sociology) , converters , forward converter , voltage , computer science , electronic engineering , boost converter , engineering , electrical engineering , control (management) , artificial intelligence
In this study, a new multi‐input high step‐up inverter, based on isolated soft‐switching DC–DC converter blocks is proposed. Each of these blocks can provide zero‐voltage and zero‐current switching for its semiconductors, which improve power efficiency. The interesting feature of this DC–DC converter is using bidirectional switches to generate both positive and negative output voltage levels in each DC–DC block with an appropriate control scheme. Each DC–DC converter operates by simple pulse width modulation control through fixed frequency and has two degrees of freedom, which provide the capability of output voltage regulation or maximum power point tracking. The proposed inverter consists of the cascaded connection of these DC–DC converters at their output terminal. This inverter can operate with high voltage gain, where the output voltage of each DC–DC converter is regulated. Furthermore, it can generate more output voltage levels with less number of DC–DC blocks. All these advantages make the proposed inverter suitable for photovoltaic power conditioning systems. In this study, the theoretical analysis with steady‐state waveforms, design constraints, resonant tank analysis and comparison study are given. Then, experimental results of both the proposed inverter and its DC–DC blocks are presented.