An Interleaved Configuration of Modified KY Converter with High Conversion Ratio for Renewable Energy Applications; Design, Analysis and Implementation

Document Type : Research paper


Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran


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.


Main Subjects

[1]    A. Sarwar Rana, M. Nasir, H. Abbas Khan, “String level optimization on grid-tied solar PV systems to reduce partial shading loss,” IET Renewable Power Gener., vol. 12, no. 2, pp. 143-148, 2018.
[2]    H. Sekhar Sahu, S. Kumar Nayak, S. Mishra, “Maximizing the power generation of a partially shaded PV array,” IEEE J. Emerging Sel. Top. Power Electron., vol. 4, no. 2. pp. 626-637, 2016.
[3]    F. Sedaghati, SH. Mohammad Salehian, H. Shayeghi, E. Shokati asl, “A configuration of double input Z-source DC-DC converter for standalone PV/battery system application,” J. Energy Manage. Technol., vol. 2, no. 3, pp. 60-69, 2018.
[4]    H. Ardi, A. Ajami, “Study on a high voltage gain SEPIC based DC-DC converter with continuous input current for sustainable energy applications,” IEEE Trans. Power Electron., vol. 33, no. 12. pp. 10403-10409, 2018.
[5]    R. w. Erickson, D. Maksimovic, “Fundamental of power electronics,” Kluwer, Norwel, MA, 2nd edition, 2001.
[6]    N. Mohan, T. M. Undeland, W. P. Robbins, “Power Electronics,”  Wilkey New York, 2nd edition, 2003.
[7]    E. Babaei, Gh. Mostafai Baruji, H. Mashinchi Maheri, “A developed structure of step-up DC/DC converter by using coupled inductor and active-clamped circuit,” J. Oper. Autom. Power Eng.,, vol.5, no.1, pp. 31-42, 2017.
[8]    E. Babaei, Z. Saadatizadeh, “High voltage gain DC–DC converters based on coupled inductors,” IET Power Electron., vol. 11, no. 3, pp. 434-452, 2018.
[9]    A. Farakhor, M. Abapour, M. Sabahi, “Study on the derivation of the continuous input current high-voltage gain DC/DC converters,” IET Power Electron., vol. 11, no. 10, pp. 1652-1660, 2018.
[10]  M. Eskandarpour Azizkandi, F. Sedaghati, H. Shayeghi, “Design of a new step-up DC-DC converter with high voltage gain for PV power application,” 33rd Int. Power System Conf., Tehran, Iran, October 2018.
[11]  S. H. Hosseini, F. Sedaghati, M. Sabahi, GB. Gharepetian, “Zero voltage switching analysis of modular isolated bidirectional DC-DC converter,” IEEE 27th Can. Conf. Electri. Comput. Eng., Canadian, 2014.
[12]  F. Sedaghati, S. H. Hosseini, M. Sabahi, G. Gharepetian, “Analysis and implementation of a modular isolated zero-voltage switching bidirectional DC–DC converter,” IET Power Electron., vol. 7, no. 8, pp. 2035-2049, 2014.
[13]  E. Salary, M. R. Banaei, A. Ajami, “Analysis of switched inductor three-level DC/DC converter,” J. Oper. Autom. Power Eng., vol.6, no.1, pp. 126-134, Jun. 2017.
[14]  M. R. Banaei, H. Ajdar Faeghi Bonab, “A novel structure for single switch non-isolated transformerless buck-boost DC-DC converter,” IEEE Trans. Ind. Electron., vol. 64, no. 1, pp.198-205, 2017.
[15]  M. R. Banaei, H. Ajdar Faeghi Bonab, “High‐efficiency transformerless buck–boost DC–DC converter,” Int. J. Circ. Theor. Appl, vol. 45, pp. 1129-1150, 2017.
[16]  H. Ardi, R. R. Ahrabi, S. N. Ravadanegh, “Non-isolated bidirectional DC–DC converter analysis and implementation,” IET Power Electron., vol. 7, no. 12, pp. 3033-3044, 2014.
[17]  K. I. Hwu, Y. T. Yau, “A novel voltage-boosting converter: KY converter,” IEEE APEC 07, pp. 368-372, 2007.
[18]  K. I. Hwu, Y. T. Yau, “KY converter and its derivatives,” IEEE Trans. Power Electron., vol. 24, no. 1, pp. 128–137, 2009.
[19]  K. L Hwu, K. W. Huang, W. C. Tu, “Step-up converter combining KY and buck-boost converters,”  lET electron. letters, vol. 47, no. 12, pp. 722-724, 2011.
[20]  K. L Hwu, Y. T. Yau, “A KY boost converter,” IEEE Trans. Power Electron., vol. 25, no. ll, pp. 2699-2703, 2010.
[21]  K. I. Hwu, Y. T. Yau, “Two types of KY Buck–Boost converters,” IEEE Trans. Ind. Electron., vol. 56, no. 8, pp. 2970-2980, 2009.
[22]  K. I. Hwu, T. J. Peng, “A novel buck-boost converter combining KY and buck converters,” IEEE Trans. Power Electron., vol. 27, no. 5, pp. 2236-2241, 2012.
[23]  A. Mostaan, H. Zeinali, S. Asghari, A. Baghramian, “Novel high step up DC-DC converters with reduced switch voltage stress,” 5th Power Electron., Drive Syst. Technol. Conf., Tehran, Iran, Feb 2014.
[24]  M. Maalandish, S. H. Hosseini, S. Ghasemzadeh, E. Babaei, R. Sh. Alishah, T. Jalilzadeh, “Six-phase interleaved boost dc/dc converter with high-voltage gain and reduced voltage stress,” IET Power Electron, vol. 10, no. 14, pp. 1904-1914, 2017.
[25]  T. Nouri, N. Vosoughi, S. H. Hosseini, M. Sabahi, “A novel interleaved non-isolated ultrahigh-step-up DC–DC converter with ZVS performance,” IEEE Trans. Ind. Electron., vol. 64, no. 5, pp. 3650-3661, 2017.
[26]  H. Bahrami, Sh. Farhangi, H. Iman-Eini, E. Adib, “A new interleaved coupled-inductor non-isolated soft-switching bidirectional DC–DC converter with high voltage gain ratio,” IEEE Trans. Ind. Electron., vol. 65, no. 7, pp. 5529-5538, 2018.
[27]  T. Rahimi, S. H. Hosseini, M. Sabahi, M. Abapour, G. B. Gharehpetian, “Three-phase soft-switching-based interleaved boost converter with high reliability,” IET Power Electron., vol. 10, no. 3, pp. 377-386, 2017.
[28]  B. Akhlaghi, N. Molavi, M. Fekri, H. Farzanehfard, “High step-up interleaved ZVT converter with low voltage stress and automatic current sharing,” IEEE Trans. Ind. Electron., vol. 65, no. 1, pp. 291-299, 2018.
[29]  F. S. Garcia, J. A. Pomilio, G. Spiazzi. “Modeling and control design of the interleaved double dual boost converter,” IEEE Trans. Ind. Electron., vol. 60, no. 8, pp. 3283 - 3290, 2013.
[30] M. A. G. de Brito, L. Galotto, L. P. Sampaio, G. d. A. e Melo, C. A. Canesin. “Evaluation of the main MPPT techniques for photovoltaic applications,” IEEE Trans. Ind. Electron., vol. 60, no. 3, pp. 1156-1167, 2013.
Volume 7, Issue 1
May 2019
Pages 90-106
  • Receive Date: 09 November 2018
  • Revise Date: 24 February 2019
  • Accept Date: 26 March 2019
  • First Publish Date: 01 May 2019