Open AccessNon‐isolated high step‐up three‐port converter with single magnetic element for photovoltaic systems
Author(s) -
Honarjoo Babak,
Madani Seyed M.,
Niroomand Mehdi,
Adib Ehsan
Publication year - 2018
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.2017.0934
Subject(s) - inductor , boost converter , electrical engineering , ćuk converter , voltage , buck–boost converter , voltage multiplier , leakage inductance , duty cycle , engineering , forward converter , capacitor , buck converter , inductance , voltage divider , dropout voltage
A new non‐isolated high‐voltage gain three‐port converter for standalone photovoltaic systems is proposed. The magnetic element of this converter is only one coupled inductor. The primary winding of the coupled inductor is shared between battery charger circuit and main converter. Leakage inductance energy of the coupled inductor is either transferred to battery or is regenerated via the passive‐clamp circuit. Using switched capacitor and voltage lift techniques, the voltage gain is significantly increased for both low‐voltage ports. Single magnetic element, high‐voltage gain with reasonable duty cycle, low‐voltage stress on the switches, low winding turn ratio of coupled inductor and high efficiency are the merits of this converter. The operation principles and the steady‐state analysis are described for the three modes of: single‐input single‐output, single‐input dual‐output and dual‐input single‐output. To verify the theoretical analysis, a laboratory prototype with 28 V input, 48 V battery voltage and 380 V output voltage is implemented and tested.