Abstract
This paper proposes a new interleaved non-isolated high step-up dc-dc converter for interfacing renewable energy applications. The proposed converter achieves a very high step-up voltage gain by using two coupled inductors and a voltage multiplier cell. This topology utilizes the interleaved boost converter in the input side, and the input current is shared with low ripple. Moreover, a voltage multiplier cell with the secondary windings of the coupled inductors is employed in the output side to achieve the interleaved energy storage. The voltage stress on the semiconductor switches and the passive components is significantly reduced and lower than the output voltage. The aforementioned converter can be operated without an extreme duty cycle or a high turns ratio. The reverse recovery problem of the diodes is mitigated, and the leakage energy is recycled. Furthermore, by implementing low-voltage-rated MOSFETs with a small ON-resistance, the conduction losses can be reduced, and the efficiency can be improved. The topology is fed by a single input voltage, and the mathematical expression is methodically explored. The operation principle of the proposed converter and the comparison between the proposed converter with other topologies are discussed. The design, parameters selection, and experimental results are thoroughly introduced. A 32 to 800 V-dc is verified and simulated by using PLECS. Consequently, a 400 W hardware prototype is verified to validate the theory and the design.
Highlights
The demand for renewable energy systems, such as photovoltaic systems, fuel cells and wind turbines, has been robust in recent years
High step-up dc-dc converters are currently being utilized in many applications, such as dc distribution
Increasing renewable energy sources would exceedingly catalyze the utilize of high step-up dc-dc power electronic converters to integrate renewable energy systems to electric power grid
Summary
The demand for renewable energy systems, such as photovoltaic systems, fuel cells and wind turbines, has been robust in recent years. High step-up dc-dc converters are currently being utilized in many applications, such as dc distribution. The associate editor coordinating the review of this manuscript and approving it for publication was Derek Abbott. Power electronic converters play a substantial role in power conversion of the distributed generation and the grid integration [1]. Increasing renewable energy sources would exceedingly catalyze the utilize of high step-up dc-dc power electronic converters to integrate renewable energy systems to electric power grid.
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