DC-Link ripple reduction of series-connected module integrated converter for photovoltaic systems

Abstract

Recently, Building Integrated Photovoltaic (BIPV) generation systems have been studied in renewable energy engineering field because the systems require small space installation and a reduced building material cost in spite of the performance degradation from partial shading. In case of a MIC with series connected output, it is easy to obtain a high DC-Link voltage for grid-connected applications. However, DC-Link voltage ripple also increases as the number of modules increases. In this paper, as a manner of ripple reduction, interleaved control method is applied to the PV MIC modules. For the implementation of the phase synchronization, Zigbee (Xbee-pro) wireless communications transceiver and DSP's Series Communications Interface are utilized. A 80W hardware prototype two boost-type of MIC is built to verify the DC-Link voltage ripple reduction. © 2011 IEEE.