This paper presents an analysis of the effect of parasitic resistances on the performance of DC-DC Single Ended Pri - mary Inductor Converter (SEPIC) in photovoltaic maximum power point tracking (MPPT) applications. The energy storage elements incorporated in the SEPIC converter possess parasitic resistances. Although ideal components signif i cantly simplifies model development, but neglecting the parasitic effects in models may sometimes lead to failure in predicting first scale stability and actual performance. Therefore, the effects of parasitics have been taken into consid eration for improving the model accuracy, stability, robustness and dynamic performance analysis of the converter. De tail mathematical model of SEPIC converter including inductive parasitic has been developed. T he performance of the converter in tracking MPP at different irradiance levels has been analyzed for variation in parasitic resistance. The con verter efficiency has been found above 83% for insolation level of 600 W/m 2 when the parasitic resistance in the energy storage element has been ignored. However, as the parasitic resistance of both of the inductor has increased to 1 ohm, a fraction of the power managed by the converter has dissipated; as a result the efficiency of the converter has reduced to 78% for the same insolation profile. Although the increasing value of the parasitic has assisted the converter to con verge quickly to reach the maximum power point. Furthermore it has also been observed that the peak to peak load current ripple is reduced. The obtained simulation results have validated the competent of the MPPT converter model.
KeywordsPhotovoltaic (PV) Renewable Energy SystemsDC-DC ConverterParasitic ResistanceMaximum Power Point Tracking (MPPT)Single Ended Primary Inductance Converter (SEPIC)
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