A dataset of an extended SEPIC DC-DC converter for micro-grid based photovoltaic (PV) applications
Description
A single-ended primary inductor converter (SEPIC) direct current to direct current (DC-DC) converter was designed and incorporated with a photovoltaic (PV) panel in this article. A dataset of voltage gain at the expense of varied values of duty-cycle was generated. Besides, a data of voltage stress across the semiconductor components were obtained to determine the feasibility of the components used in designing the extended SEPIC converter. One of the aims of generating these data was to boost the low energy generated by the panel to a higher energy value with less complexity. For voltage gain data, a duty-cycle value was varied from 0.5 to 0.9 (50% to 90%) and the data obtained for the voltage gain was recorded. For voltage stress data, a voltage across individual active component of the converter was measured. These data could be reused by researchers interested in incorporating PV panel with a DC-DC boost converter for off-grid modelling.
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Materials and Methods The topology presented in this work consists of two inductance L1 & L2, three diodes D1, D2, & DO, three capacitors C1, C2 & CO and one active power switch. As it can be seen, the new converter has additional two diodes and one capacitor (D_1,D_2 & C_2) compared to the conventional SEPIC topology. The energy generated from the PV panel (V_PV) will go through inductor L_1, then, to the power switch. When the power switch is ON, it will amplify the energy and turns it to pulsating signal. Capacitor C_2 is placed between the two diodes such that the voltage coming out of it will be blocked by D_1, as such, C_1will combine the voltage coming from the power switch with the voltage coming from C_2and dissipate it to the inductor L_2. Both diodes D_1&D_2 were used to stop the second capacitor (C_2) from discharging. Capacitor C_1 was designed such that, the energy coming from the switch cannot be enough to make it to start discharging. Therefore, it will delay the discharge process until when the energy from C_1arrived. Inductor L_2 served as a filter. Output diode D_o will rectify the signal from pulse to straight line DC signal and dissipate it to the output capacitor〖 C〗_O . After the realization of the new converter, a laboratory set up was prepared and individual data were recorded.