Abstract
This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter (qZIBDC) for renewable energy applications. The converter utilizes a dual active bridge circuit with a quasi-Z-source network on both sides, so the converter works as buck/boost converter from either side. It has a wider input/output voltage operating range, soft-switching capabilities without additional devices, and higher boost capability than a traditional dual active bridge circuit. Apart from that, shoot-through states are incorporated in its operating cycle to boost the input voltage resulting in high reliability of the proposed converter. Due to the symmetrical structure of the circuit, there is no defined high voltage or low voltage side as in traditional isolated bidirectional DC-DC converter. The operating principle and control strategy of the proposed converter are presented. Simulation and experimental results are provided to verify the effectiveness of the proposed converter topology and its control strategy.
Highlights
Introduction1Bidirectional DC-DC converter has become a promising choice in applications where bidirectional power flow is required, such as dc motor drive systems, battery charging and discharging systems and auxiliary supplies for hybrid and fuel-cell vehicles[1,2,3]
This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter for renewable energy applications
Bidirectional DC-DC converter has become a promising choice in applications where bidirectional power flow is required, such as dc motor drive systems, battery charging and discharging systems and auxiliary supplies for hybrid and fuel-cell vehicles[1,2,3]
Summary
Bidirectional DC-DC converter has become a promising choice in applications where bidirectional power flow is required, such as dc motor drive systems, battery charging and discharging systems and auxiliary supplies for hybrid and fuel-cell vehicles[1,2,3]. Due to high frequency transformer, the converter size gets reduced and ground leakage current is negligible so is applicable as bidirectional converter for distributed power generation systems. These systems usually benefit from storage, which requires a bidirectional converter, such as presented here. The control method is simple as it requires controlling of only four switches on the source-side converter, while the body diode on the other side is used as synchronous rectification This reduces the complexity of control of all eight switches to that of a normal DAB.
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