Design, modeling and implementation of a high step up z-source converter for connection of renewable energy source to the electrical grid

Document Type : Research Paper

Authors

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

Abstract

Today, solar energy, fuel cells and wind energy have attracted much attention as clean sources of energy. These sources can deliver energy either to the grid or directly to the consumer. The produced voltage level of these sources is usually low and needs to be increased. This problem can be solved using switching converters. These converters should have the ability to provide high voltage gain. In this paper, a high step-up switching converter is presented based on z-source technique. The proposed converter not only increases the voltage gain, but also reduces voltage and current stress of the switch, so, switches with small on-resistance cab be used which contributes to conducting loss reduction and efficiency improvement. Also, coupled inductors are used in this converter that reduces the circuit volume. At first, the operating modes of the proposed converter are analysed, then, an experimental prototype is designed, and the performance validity is investigated via simulation in PSPICE software. Finally, a practical sample of the proposed converter is implemented in 100 kHz and 200W output power. The obtained results verify the theoretical analysis as well as the correct performance of the proposed converter.

Keywords

Main Subjects

References

 
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Journal of Modeling in Engineering
Volume 16, Issue 53
July 2018
Pages 221-229

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History

  • Receive Date: 25 February 2017
  • Revise Date: 02 May 2017
  • Accept Date: 09 July 2017

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