Variable interleaving technique for photovoltaic cascaded DC-DC converters

Author

Kashani, Mahsa Ghapandar ; Mobarrez, Maziar ; Bhattacharya, Subhashish

Author_Institution

Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA

fYear

2014

Firstpage

5612

Lastpage

5617

Abstract

This paper introduces a variable interleaving technique for photovoltaic cascaded DC-DC converters. A series rather than parallel connection of converters allows higher switch utilization and lower rating of components; however, they suffer from nonhomogeneous irradiations condition. Under partial shading conditions, the input power of all PV panel will not be the same and as a result the output voltage of each converter will not be identical. This causes system to operate in an asymmetric condition, in which, the conventional interleaving techniques are not capable of eliminating the DC link output voltage variations. In this work, an interleaving algorithm is reported on cascaded DC/DC converters under asymmetric condition to minimize the DC link output voltage variations. The effectiveness of this algorithm for cascaded DC-DC converters has been validated by simulation and Hardware-In-the-Loop tests.

Keywords

DC-DC power convertors; photovoltaic power systems; DC link output voltage variations; PV panel; asymmetric condition; hardware-in-the-loop tests; nonhomogeneous irradiations condition; partial shading conditions; photovoltaic cascaded DC-DC converters; variable interleaving technique; Algorithm design and analysis; DC-DC power converters; Harmonic analysis; Microwave integrated circuits; Photovoltaic systems; Topology; ) Variable Interleaving (VI); Incremental conductance (IncCond; Maximum power point tracking (MPPT); photovoltaic (PV);

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE

Type

conf

DOI

10.1109/IECON.2014.7049359

Filename

7049359