A new step‐up DC‐DC converter with high gain for photovoltaic applications

Abstract

Using interfacing converters with a high boost factor and high efficiency is essential for utilizing the solar cells energy since these energy sources produce low voltage levels. Although employing a high‐frequency transformer or coupled inductors in such converters results in high gain, these elements increase the weight, volume, and cost and affect the efficiency. This article presents a new topology for DC‐DC converter with a high voltage gain to overcome the mentioned problems. The converter provides a higher voltage gain than conventional structures while it includes only one power switch. The switch is connected to the ground; thus, a simple control circuit is required. Besides, the proposed structure has a low output voltage ripple. In this paper, the operating modes of the proposed topology, the influence of parasitic elements on the boost factor, and the efficiency have been described in detail. These item has been examined by experimental verifications. A 500‐W laboratory prototype confirms the proposed topology. Results demonstrate that the topology produces high efficiency and voltage gain.

Switched inductor‐capacitor‐based quasi‐Z source converter for renewable energy source integration

“…To overcome this limitation, quadratic gain and modified quadratic gain converters are introduced. [12][13][14][15][16][17] Modified quadratic gain converters with a gain of (1 + D)/(1 À D) 2 , where D is duty ratio, are reported in previous studies. 12,13,16 A converter with a gain of (3 À 2D)/(1 À D) 2 is reported in literature.…”

“…Modified quadratic gain converters with a gain of (1 + D )/(1 − D ) 2 , where D is duty ratio, are reported in previous studies 12,13,16 . A converter with a gain of (3 − 2 D )/(1 − D ) 2 is reported in literature 15,16 . This quadratic gain converter can achieve a higher voltage gain only when the duty ratio D > 60%.…”

“…12,13,16 A converter with a gain of (3 À 2D)/(1 À D) 2 is reported in literature. 15,16 This quadratic gain converter can achieve a higher voltage gain only when the duty ratio D > 60%. This increased duty ratio leads to inductor core saturation problems and increases conduction losses.…”

“…A two‐inductor boost converter with VM and SC cells is reported to increase the voltage gain in Andrade et al 9 A family of high‐gain modified boost converter is reported in Shaw et al 11 In all these converters, even though the gain is increased compared to the conventional boost converters, there is still a limitation on the maximum voltage gain. To overcome this limitation, quadratic gain and modified quadratic gain converters are introduced 12–17 . Modified quadratic gain converters with a gain of (1 + D )/(1 − D ) 2 , where D is duty ratio, are reported in previous studies 12,13,16 .…”

Design and implementation of dual‐leg generic converter for DC/AC grid integration

“…20,21 According to this proposed research concept, the proposed converter can accept both AC/DC supplies and also deliver power to AC/DC load,; because the converter is more flexible, it can perform all four types of power conversion with minimal number of switches. This same operation is performed with more number of switches, 22,23 but proposed converter can perform all four operations in bidirectional with less switching losses. Proposed work is devoted with novel idea of generic or universal operation for energy storage system.…”