Quasi‐Z‐source‐based bidirectionalDC‐DCconverters for renewable energy applications

Abstract

Summary This article presents a design, analysis, and implementation of a novel impedance‐source‐based bidirectional DC‐DC converter. The proposed converter employs an impedance network to the existing dual‐active‐bridge (DAB) circuit. It inherits all the advantages of the DAB converter along with extra benefits. Compared with the traditional isolated DC‐DC converter, the proposed converter improved the boost ability of the converter. Also, the converter can withstand the shoot‐through phenomenon in an H‐bridge, improving the reliability. The converter can work in the normal buck/boost DAB mode when extra boost is not required. The bidirectional feature is inherent along with soft switching capability. It is therefore well‐suited for the applications, where wide range of voltage gains are required such as renewable energy systems. The topological configuration and control strategy of the proposed topology in both operational modes are discussed. Simulation and experiments have been carried out to demonstrate the effectiveness of the proposed converter topology. The peak efficiency 97% was observed at the rated load of 500 W.

Design and Development of Fixed-Frequency Double-Integral SM-Controlled Solar-Integrated Bidirectional Quasi Z-Source DC-DC Converter in Standalone Battery Connected System

“…For DC-DC applications, the concepts of Z-source converter and quasi Z-source converter (QZSC) are often used [9][10][11]. In [12], QZSC has been used in bidirectional power flow applications, where the buck and boost modes were individually controlled [13,14]. However, in the case of the converter connected to a standalone microgrid, it is essential that the DC link voltage is regulated in both modes of operation based on the power demand [14][15][16][17].…”

Bidirectional Quadratic Converter-Based PMBLDC Motor Drive for LEV Application

“…Due to its high efficiency and controllability, the PMBLDC motor is the most popular option in the drive train of low-to-medium power EVs. In the past decade, to improve the drivetrain's efficiency, research on bidirectional DC-to-DC converters (BDCs) for EV applications has been extensively done [1][2][3][4][5]. e problem with these BDCs is that they have a large number of component requirements and high voltage stress on the switches.…”

Regenerative Braking in Electric Vehicle Using Quadratic Gain Bidirectional Converter

“…A dual-switch buck/ boost converter [13] has minimal power loss and excellent efficiency; however, the switch is under a high voltage stress. In [14,15], a switched quasi-Z-source BDC is presented by alteration in the place of the main power switch in a conventional two-level quasi-Z-source BDC for improvement of conversion efficiency, but it requires more number of the power switch. To get higher voltage gain without wider duty cycle operation, a voltage multiplier circuit (VMC) [16] is proposed.…”