High‐voltage gain SEPIC‐based DC–DC converter without coupled inductor for PV systems

Abstract

A new single-ended primary-inductor converter (SEPIC)-based DC-DC converter suitable for photovoltaic (PV) systems is introduced. The proposed converter has the advantage of continuous input current which reduces the input voltage ripple across the PV panels. Furthermore, it can provide a higher-voltage gain at smaller duty cycles when compared with counterpart SEPIC-based topologies which feature the absence of a coupled inductor. A smaller duty cycle for a given voltage gain translates to a lower-current ripple of the inductors, reduced conduction losses, and alleviated voltage stresses of the semiconductor switches. The proposed converter also benefits from a simpler structure and control scheme. The operational principles and the steady-state analysis are studied under both continuous conduction mode and discontinuous conduction mode. A comparative study between the proposed converter and seven counterpart topologies is also included. A laboratory prototype was built and tested. The experimental results are discussed in light of the theoretical analysis.

Quadratic buck–boost converter with reduced input current ripple and wide conversion range

“…It is indisputable that power electronics converters are essential for processing the generated power from renewable sources. Among the DC renewable power sources, proton exchange membrane fuel cell (PEMFC) systems [1][2][3] and photovoltaic (PV) panels [4][5][6] are the most remarkable. In the design of an energy management system, there are two main requirements, besides traditional needs of the power electronics converters; (i) the wide voltage-range of operation and (ii) the requirements on the input current harmonic distortion.…”

Nonisolated high step‐up DC‐DC interleaved SEPIC converter based on voltage multiplier cells

“…It is possible to avoid the use of magnetic coupling and obtain a reduced number of components in the power stage as in Gules et al 17 Even though the voltage stress on the switch is less than the output voltage, the voltage gain is only slightly higher than that of the classical SEPIC converter. The topology in Heydari et al 17 allows sharing the input current between two inductors, but the experimental results show that it cannot achieve high efficiency compared with other similar counterparts even though the prototype is designed for a voltage gain of only four times. A two‐switch SEPIC‐based topology with extended conversion ratio relying on this very same principle is presented in Ansari and Moghani, 18 but it requires three magnetic cores.…”

Maksimum Güç Noktası İzleyici Algoritmalarının Verim, Salınım Miktarı ve Yakınsama Süresi Açısından Karşılaştırılması

“…Güneş paneli uygulamalarında, sistemi maksimum güç noktasında çalıştırmak ve yüksek verimlilik elde etmek istenmektedir [11]. Bu doğrultuda, güneş panellerinde üretilen gücü, talep edilen çıkış gücüne yüksek verimlilikle transfer edebilmek için MGNİ birimi ile birlikte DA -DA dönüştürücüler kullanılmaktadır [12].…”