University of Mohaghegh Ardabili Journal of Operation and Automation in Power Engineering 2322-4576 7 1 2019 05 01 An Interleaved Configuration of Modified KY Converter with High Conversion Ratio for Renewable Energy Applications; Design, Analysis and Implementation یک ساختار درهم تنیده از مبدل KY بهبودیافته با نسبت تبدیل بالا برای کاربردهای انرژی های تجدیدپذیر، طراحی، تحلیل و پیاده سازی 90 106 753 10.22098/joape.2019.5451.1409 EN M. Eskandarpour Azizkandi Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran F. Sedaghati Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran H. Shayeghi Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran Journal Article 2018 11 09 In this paper, a new high efficiency, high step-up, non-isolated, interleaved DC-DC converter for renewable energy applications is presented. In the suggested topology, two modified step-up KY converters are interleaved to obtain a high conversion ratio without the use of coupled inductors. In comparison with the conventional interleaved DC-DC converters such as boost, buck-boost, SEPIC, ZETA and CUK, the presented converter has higher voltage gain that is obtained with a suitable duty cycle. Despite the high voltage gain of the proposed converter, the voltage stress of the power switches and diodes is low. Therefore, switches with low conduction losses can be applied to improve the converter efficiency. Moreover, due to utilization of interleaving techniques, the input current ripple is low which makes the suggested converter a good candidate for renewable energy applications such as PV power system. Operation principle and steady-state analysis of the proposed converter in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are discussed in detail. Also, theoretical efficiency of the proposed converter is calculated. Finally, in order to evaluate the proposed converter operation by a renewable energy source such as a PV, the simulation results are presented. Moreover, a 220W prototype of the presented DC-DC converter is designed and implemented in the laboratory to verify its performance. https://joape.uma.ac.ir/article_753_a8b48e861ea7df1f94051a55fb621a38.pdf