Vrashali JadhavInt. Journal of Engineering Research and Applications www.ijera.com ISSN: 2248-9622, Vol. 6, Issue 1, (Part - 5) January 2016, pp.59-64 www.ijera.com 59|Page Maximum PowerPoint Tracking of PV System Based on a SEPIC Converter Using Fuzzy Logic Controller Vrashali Jadhav 1 , Dr. Ravindrakumar M.Nagarale 2 1 PG student, M.B.E. Society’s college of engineering, Ambajogai, Maharashtra, India 2 PG Department, M.B.E. Society’s College of engineering, Ambajogai, Maharashtra, India ABSTRACT This paper presents the MPPT (Maximum power point tracking) operation of PV (Photovoltaic) system based on a SEPIC (Single Ended Primary Inverter Converter) converter using fuzzy logic controller. MPPT method such as Incremental conductance base on FLC (Fuzzy Logic Controller) is used to extract maximum output power of the PV system. PV energy is the most essential energy resources since it is pollution free, clean and endless. The FLC proposed scheme is interface with the MPPT to generate the PWM (Pulse Width Modulation) for the SEPIC controller for maximum power point tracking operation.FLChas used Mamdani’s method for convergent and divergent of membership function. FLC is used for more efficient performance under the variation in different atmosphere. The fuzzy logic controller with SEPIC for MPPT scheme extract the maximum power point tracking without any change in the voltage at the inverter at different load condition. The behavior of the converter and controller tested in simulation at different operating conditions. Proposed scheme is used for accurately tracking maximum point and also send the smooth, error free signal to the inverter. Keywords:DC-DC power converters, Fuzzy control, PV (photovoltaic) cells, MPPT (Maximum power Point Tracking) I. INTRODUCTION The SEPIC works like a buck boost dc-dc converter, where its output voltage gets varied as per its duty cycle. It’s very important to select the proper dc-dc converter which plays vital role for maximum power point tracking operation. There are many factors such as cost, efficiency, flexibility and energy flow which are considered for selection of proper PV converter. The SEPIC, conventional buck boost and Cuk converter are the once amongst the known converters having an ability to step up and step down the input voltage. So these converters can transfer energy for all irradiation levels. The continuous output current is the second desirable feature which allows converter output parallel connection or conversion to a voltage source with minimum capacitance. The lack of output voltage flexibility is the main reason for buck or boost Converter to be not preferable. For example, the buck and boost converter are not able to charge the battery continuously (in case of PV system battery charger). With MPPT operation as the power voltage curve gets varied with irradiation level and thus the voltage corresponding to the maximum power variation. To propose dc-dc converter, there reason so many considerable features, like input output energy flow, cost, flexibility and PV array effect. The SEPIC is chosen because output voltage can be higher or lower than the input voltage. Also the input and output voltage are dc isolated. The isolation provided by the series capacitor C, which blocks the D.C. from the supply side to the output side [1]. The voltage multiplier technique and active clamp technique are used to conventional SEPIC converter to increase the voltage gain, reduce the voltage stress of the power switch and diode. There is provision in both the SEPIC and Cuk converter for a choice to have either higher or lower output voltage as compared to the input voltage. Both have contentious input current and better efficiency compared to the buck boost and fly back converter[2]. The literature so far does not have the general opinion on which one of the two converts is better [3]. Now this paper proposes SEPIC converter use due to the Cuk converter’s inverted output. The PV panel yields exponential curve for current and voltage, where the maximum power occurs at the curve’s mutual knees [4]. The applied MPPT uses a type of control and logic to look for the knees, which in turn allows the SEPIC converter to extract maximum power from the PV array and the used tracking methods areIC (Incremental Conduction), which provides a new reference signal for controller and extracts the maximum power from PV array. Fuzzy logic is the simplest intelligent controller to integrate with the system. Because of the FLC’s better response than the other conventional controllers, it has drawn significant attention to researches for converter control, motor drives and other process control [5]. Fuzzy controller is capable RESEARCH ARTICLE OPEN ACCESS