HIGHLY EFFICIENT POWER-CONDITIONING TOPOLOGIES FOR PHOTOVOLTAIC APPLICATIONS

Vasudevan Saravanan, Rangarajan Ramanujam, and Murugesan Arumugam

Keywords

Voltagesource inverters, buck–boost, DC–AC converters, photovoltaic

Abstract

Three inverter topologies namely diode-assisted Cuk-, single ended primary inductor converter (SEPIC)and H-bridge zero vector rectifier (HB-ZVR) based buck–boost voltage-source inverters (VSI) are analysed in MATLAB/SIMULINK environment, and a scaled down laboratory prototype of 50 VA Cuk-based buck–boost VSI is constructed for photovoltaic systems and its performance is analysed. Diode-assisted Cuk and SEPIC-based buck–boost VSIs which have a cross-shaped diode–capacitor topology placed between dc source and inverter circuit is presented. Higher voltage gain can be obtained from these inverters by configuring themselves to have capacitive charging in parallel, and discharging is series with appreciable waveform quality. The HB-ZVR topology which consists of a diode rectifier and a switch clamped to midpoint of dc is also studied, which acts as a better power-conditioning network for photovoltaic applications.

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