Title :
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
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);
Conference_Titel :
Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE
DOI :
10.1109/IECON.2014.7049359
