Analysis of Integrated SEPIC & KY Converter for Solar Energy Conversion with MPPT Controller

Abstract

This paper presents, the analysis of integrated SEPIC & KY, a hybrid dc–dc converter with applications for low-voltage renewable energy sources The PV systems are rapidly expanding and have increasing roles in electric power technologies, providing more secure power sources and pollution free electric supplies. The system consists of solar panels, MPPT (Maximum Power Point Tracking) controller, integrated SEPIC & KY converter. This converter gives a constant dc bus voltage and its duty cycle is controlled by the MPPT controller. A P&O (Perturbation & Observation) approach is applied for MPPT. To maintain the power quality a feedback control is used. The complete system is designed, and modeled to evaluate its performance. Simulated results are presented to demonstrate the performance of the MPPT controller and designed system for varying atmosphere conditions and load disturbances. Moreover, the SEPIC converter needs no current snubber for the diodes. The integrated SEPIC & KY converters in which SEPIC converter provide additional step up gain and KY converter reduces the voltage stress, also they provide higher voltage conversion ratio and reduces the output voltage ripples. This high step-up converter has finds its applications, in electric vehicles, uninterrupted power supplies (UPS), high-intensity- discharge (HID) lamp, fuel cell system, and photovoltaic systems.

References

1. Neha Adhikari,,Bhim Singh, A. L. Vyas,,Indian Institute of Technology Delhi,“Performance Evaluation of a Low Power Solar- PVEnergy System with SEPIC Converter” IEEE PEDS 2011, Singapore, 5 - 8 December 2011
2. Trishan Esram, IEEE, and Patrick L. Chapman, IEEE“Comparison of Photovoltaic Array Maximum PowerPoint Tracking Techniques” IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 22, NO. 2, JUNE 2007 439
3. Moacyr Aureliano Gomes de Brito, Luigi Galotto, Jr., Leonardo Poltronieri Sampaio,Guilherme de Azevedo e Melo, and Carlos Alberto Canesin, IEEEuan Lu, Senior Member“Evaluation of the Main MPPT Techniques for Photovoltaic Applications”, IEEE 1156 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 60, NO. 3, MARCH 2013
4. K. I. Hwu, and Y. T. Yau, “ KY Converter and Its Derivatives” IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 24, NO. 1, JANUARY 2009
5. M. Salhi, R. El-Bachtiri Faculty of Science Dhar El-Mehraz, Department of Physics, LESSI laboratory, REEPER groupEST, km5, Rte Immouzer, BP 2427, Fès, Morocco “Maximum Power Point Tracking Controller for PV Systems using a PIRegulator with Boost DC/DC Converter” ICGST-ACSE Journal, ISSN 1687-4811, Volume 8, Issue III, January 2009
6. Andrea C 551 “Stability Issues in Peak-Current-Controlled SEPIC” IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 26, NO. 2, FEBRUARY 2011
7. Jae-Won Yang and Hyun-Lark Do 3388 “Bridgeless SEPIC Converter With a Ripple- Free Input Current” IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 28, NO. 7, JULY 2013
8. Ki-Bum Park, IEEE, Gun-Woo Moon, IEEE,and Myung-Joong Youn, IEE “ Nonisolated High Step-up Boost Converter Integrated With SEPIC Converter” IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 9, SEPTEMBER 2010
9. P.Pugazhendiran, Dr.J.Baskaran, R.Vinothini, “A STEP-DOWN AND STEP-UP DC-DC VOLTAGECONVERTER COMBINING KY AND SR BUCK CONVERTERS” International Journal of Technology and Engineering System(IJTES)
10. K. I. Hwu,, and Y. T. Yau, “A KY Boost Converter” IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 11, NOVEMBER 2010 Letters