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

Mr.S.Venkatanarayanan, Mrs.G.Jeyalakshmi

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.