A new interleaving technique based on current ripple reduction of paralleled converters for renewable systems

• Published in: Australian journal of electrical & electronics engineering 2014-02, Vol.11 (1), p.41
• Main Authors: Hu, B, Sathiakumar, S
• Format: Article
• Language: English
• Subjects: Analysis; Electric current converters; Methods
• ISSN: 1448-837X
• DOI: 10.7158/E13-011.2014.11.1.

Conventional interleaving switching techniques are widely used to minimise the output current ripples of one input source with several paralleled DC-DC converters. The method of minimising the output current ripples of different paralleled renewable sources working with different duty cycles has never been considered and conventional interleaving techniques are no longer practical to meet requirements. This paper proposes a novel interleaving switching technique for multi-input sources using a novel phase shift method to reduce the current ripples, and further reduce the size/cost of inductors and capacitors needed for filtering. It has favourable advantages such as low cost and fast dynamic response. It is able to accommodate variable input voltages and duty cycles from each converter and the failures of one or more cells. The proposed switching technique is applicable to any type of buck-derived or boost-derived DC-DC converters integrated with renewable sources. It can be used to implement maximum power point tracking applications for integrating renewable sources to the grid. In this paper, photovoltaic systems are adopted for analysis. The proposed technique is validated through detailed mathematical analysis, simulation and implementation. KEYWORDS: Current ripple cancellation; parallel converters; multi-input; MPPT; renewable systems.