WSEAS Transactions on Power Systems
Print ISSN: 1790-5060, E-ISSN: 2224-350X
Volume 8, 2013
Parasitic Burden on the Performance of Coupled Inductor SEPIC Based Maximum Power Point Tracking in PV Systems
Authors: , ,
Abstract: This paper presents the effect of parasitic resistive burden in maximum power point tracking of photovoltaic (PV) systems using coupled inductor Single Ended Primary Inductance Converter (SEPIC). The energy storage elements incorporated in the coupled-SEPIC converter possess parasitic resistances. The particular effects of parasitics have been taken into concern for improving model accuracy, stability as well as the dynamic performance of the converter in MPPT applications. Detail model of coupled-SEPIC including inductive parasitic were developed. The performance of the converter in tracking MPP at different irradiance levels was analyzed for variation in parasitic resistance. The influence of converter as well as converter parameters on system behavior was investigated. It was found that the MPPT circuit reaches the maximum power point very fast followed by nearly free of start-up transient overshoot for reduced value of parasitic elements. For the similar load and at different weather conditions the MPPT efficiency was calculated. The maximum MPPT efficiency by using the coupled inductor SEPIC has been found 99.93%. The obtained simulation results validated the converter model in MPPT circuit.
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Keywords: Photovoltaic (PV) energy systems, Parasitic burden, Maximum Power Point Tracking (MPPT), Single ended primary inductance converter (SEPIC), Magnetic coupling, Energy storage elements