Modified Cascaded Z-Source High Step-Up Boost Converter

Abstract

To improve the voltage gain of step-up converters, the cascaded technique is considered as a possible solution in this paper. By considering the concept of cascading two Z-source networks in a conventional boost converter, the proposed topology takes the advantages of both impedance source and cascaded converters. By applying some modifications, the proposed converter provides high voltage gain while the voltage stress of the switch and diodes is still low. Moreover, the low input current ripple of the converter makes it absolutely appropriate for photovoltaic applications in expanding the lifetime of PV panels. After analyzing the operation principles of the proposed converter, we present the simulation and experimental results of a 100 W prototype to verify the proposed converter performance.

Modernisation of DC-DC converter topologies for solar energy harvesting applications: A review

“…The Z-source comprises two identical inductors and two capacitors, in which the modernization of this configuration has been fluent and conducted to achieve better performance [87], [102], [122], [166], [291], [300], [314], [366]- [368]. A modified Z-source DC-DC converter is proposed by [367].…”

“…In addition, because the converter has such a low ripple in its input current, it is totally suitable for use in photovoltaic applications, which can lengthen the lifetime of PV panels. The high step-up DC-DC impedance source-based boost converter that has been suggested [291] consists of two cascaded Z-source networks as well as two switched-capacitor-inductor cells. A single ferrite core is used in the converter, and it has a total of six connected inductors that are included into the impedance network and the cells.…”

A new extended single-switch high gain DC–DC boost converter for renewable energy applications

“…Quasi Z-source converters 23 , quasi-Y-source converters 24 , and hybrid Z-source boost converters 25 were also founded. Two cascaded Z-source boost converters were proposed in 26 , which took the advantage of cascaded technique and impedance source converters. These topologies attained high voltage gain at a small duty ratio and continual input current.…”

“…So, it is suitable only for low-power applications. The current work also differs from the circuits in 23 – 26 which employ Quasi Z-source, quasi-Y-source, hybrid Z-source, and two cascaded Z-source boost converters, respectively. Although these topologies attain high voltage gain with a low duty ratio and continuous input current.…”

A Novel DC-Power Control Method for Cascaded Converter under DC Voltage-Imbalance Condition

“…e cascaded H-bridge converter (CHB) has become an outstanding type of converter circuitry in the mediumvoltage converter eld due to its merits, such as low switching voltage stress, improved output waveform quality, and modular and extendible structure [1][2][3][4][5]. As a suitable topology for high power applications, the CHB has been widely researched and applied both in research and industries, such as renewable energy systems [6], high-voltage power AC transmission systems [7], and large-scale photovoltaic power plants [8].…”