Abstract
Over the past few years, high step-up dc-dc converters have been drawn substantial attention because of their wide-ranging application not only in the renewable energy sector but also in many other applications. To acquire a high voltage gain in photovoltaic (PV) and other renewable energy applications, a high step-up dc-dc converter is proposed in this paper. The proposed converter structure consists of a full-bridge (FB) module along with an input boost inductor and a voltage multiplier based on the Cockcroft-Walton (CW) principle with a parallel inductor. The key features of the proposed converter are: 1) high voltage gain with lower voltage stress on the switches, diodes and other passive elements without affecting the number of cascaded stages, 2) a minimum size of boost inductance and cascaded stage capacitance that ensures its compactness and low cost, and 3) a minimal number of major components. Circuit operation, steady-state analysis and various design parameters of the proposed converter are explained in details. In order to prove the performance of the theoretical analysis, a laboratory prototype is also implemented. The peak voltage gain and the maximum efficiency obtained are 11.9 and 94.6% respectively with very low input current ripple and output voltage ripple generated.
Highlights
Solar resources are inexhaustible and their harvest and applications are environmental friendly
The use of four switches needs an extra isolated driver circuit, the proposed topology possess several adjuvant features: 1) lower voltage stresses of the active devices facilitate the use of low resistance, RDS(ON) switch and Schottky diode cause the reduced losses, leading to the higher efficiency; 2) the use of the boost inductance and CW capacitance are reduced significantly resulting the prominent dynamic performances and compact converter size and weight; 3) high voltage gain can be attained and suitable for medium voltage or high voltage PV and many other energy applications
High step-up dc-dc converters are broadly considered as the significant part of the most of the renewable energy systems and many other applications
Summary
Solar resources are inexhaustible and their harvest and applications are environmental friendly. The dc-dc converters offering high gain designed by cascaded diode-capacitor or diodeinductor cell rather than the use of coupledinductor or step up transformer have been proposed by many researchers that offer high voltage conversion ratio with simple and robust structure [27,28,29,30]. The use of four switches needs an extra isolated driver circuit, the proposed topology possess several adjuvant features: 1) lower voltage stresses of the active devices facilitate the use of low resistance, RDS(ON) switch and Schottky diode cause the reduced losses, leading to the higher efficiency; 2) the use of the boost inductance and CW capacitance are reduced significantly resulting the prominent dynamic performances and compact converter size and weight; 3) high voltage gain can be attained and suitable for medium voltage or high voltage PV and many other energy applications.
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