This document discusses the design of a photovoltaic system using a SEPIC converter to provide a constant output voltage. Solar panels provide a variable output voltage due to changes in temperature and sunlight intensity. A SEPIC converter is proposed to maintain a constant output voltage regardless of the variable solar panel input voltage. The SEPIC converter design and simulation results are presented. Experimental results from a 20W prototype validate that the SEPIC converter can provide efficient power transfer from the solar panel to the load while regulating the output voltage.

1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 6583
Design Photovoltaic System with Constant Output using
SEPIC Converter
Ms. Shivani S. Unde1, Prof. P.D. Pange2
1Student, E&TC Dept. of AMGOI Engineering, Maharashtra, India
2Professor, E&TC Dept. of AMGOI Engineering, Maharashtra, India
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Abstract –Now a day everywhere in world solar energy is more useful & everyone try to maintain solar energy but
solar energy gives variable output which is not good for home appliances & industry. So to maintain it is necessary. In
this paper we try to maintain output of solar panel. For this we refer MPPT, SEPIC converter & solar panel.
Key Words: PV module, Solar panel, Sepic converter, MPPT
1. INTRODUCTION
The photovoltaic (PV) system gives variable output voltage due to temperature and insolation variation with
respect to time. This paper presents the design of a SEPIC converter for getting constant output voltage from PV
system using a simple control circuit. The SEPIC is designed to make the power flow from PV module to load
effectively and maintaining constant output voltage. This paper gives the detailed design and implementation of a
20W prototype SEPIC integrated PV power supply with soft start feature. The efficiency of the proposedmethodis
proved with simulation results and prototype experimental results. The SEPIC is a DC to DC converterinwhichthe
output voltage is having same polarity as that of input voltage. One benefit of the SEPIC converter is that the input
ripple currentin the input capacitor is continuous.Thisreducestheamountofinputcapacitancenecessaryforlow-
ripplevoltage,whichreducesEMI(ElectroMagneticInterference).SEPICconvertermaintainsafixedoutputvoltage
regardless of whether the input voltage.
2.1 ARCHITECTURE
FIGURE 2.1 BLOCK DIAGRAM OF SYSTEM
2.1 DETAILS OF ARCHITECTURE
2.1.1 SOLAR PANEL
There are many types of PV systems namely the stand alone and grid connected PV system. The standalone PV
system require battery for the supply of power to the load during the low solar period. Generally the I-V
characteristic of a solar panel depends on insolationlevel and temperature. If the outputvoltageofPVsystemdoes
not match with the battery voltage, the energy conversionefficiencyofPVsystemisreduced.Henceitisrequiredto
track the PV panel voltage at all operating conditions. Photovoltaic(PV)systemgivesvariableoutputvoltagedueto
temperature &insolation variationwithrespecttotime Solarpanelispacked&connectedassemblyofphotovoltaic
cells. The solar panel can be used as component of larger photovoltaic system to generate & supply electricity in
commercial & residential applications.

2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 6584
Table 2.1.1 Specifications of solar PV panel
Sr .no Description Specification
1 Short circuit current 2.0A
2 Voltage at MPP 15
3 Current at MPP 2.15
4 Open circuit voltage 20V
5 Maximum power 35W
FIGURE 2.1.1 V-I characteristics of solar panel
2.1.2 SEPIC CONVERTER
A SEPIC is used as power factor correction stage is good solution for power supplies in electronic blasts. SEPIC
converter is the best alternative to track maximum power from PV panel. The maximum power tracking for PV
panel using dc-dc converter is developed withoutusingmicrocontroller.Thenominaldutycycleofthemainswitch
in the SEPIC converter is adjusted to a value, so that the input resistance of the converter is equal to the equivalent
output resistance of the solar panel at the MPPT.A SEPIC is applied to interface a thermoelectric power generator
output to battery & to track maximum power point (MPPT) of TE power generation. Power distribution system
having central power supply whose output is connected to load which is regulated by constant frequency
techniques.
Table 2.1.2 specifications of SEPIC converter
Sr .no Description Specification
1 Input Voltage 10V DC -30V DC
2 Output Voltage Switching 15V DC
3 Output Current 2A
4 Ripple 38%
5 Duty Cycle range 0.50 to 0.40
6 Switching frequency 300KHz

3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 6585
2.2 SIMULATION
FIGURE 2.2 SIMULATION OF SYSTEM
3. CONCLUSION
This paper we try design solar system which rovide constant output with better efficiency. The efficiency of
proposed method is proved with simulation. Detail study after actual set up give more accuracy in future also.
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