International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019
p-ISSN: 2395-0072
www.irjet.net
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
E&TC Dept. of AMGOI Engineering, Maharashtra, India
----------------------------------------------------------------------***--------------------------------------------------------------------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.
2Professor,
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 proposed method is
proved with simulation results and prototype experimental results. The SEPIC is a DC to DC converter in which the
output voltage is having same polarity as that of input voltage. One benefit of the SEPIC converter is that the input
ripple current in the input capacitor is continuous. This reduces the amount of input capacitance necessary for lowripple voltage, which reduces EMI (Electro Magnetic Interference). SEPIC converter maintains a fixed output voltage
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 insolation level and temperature. If the output voltage of PV system does
not match with the battery voltage, the energy conversion efficiency of PV system is reduced. Hence it is required to
track the PV panel voltage at all operating conditions. Photovoltaic (PV) system gives variable output voltage due to
temperature & insolation variation with respect to time Solar panel is packed & connected assembly of photovoltaic
cells. The solar panel can be used as component of larger photovoltaic system to generate & supply electricity in
commercial & residential applications.
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International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019
p-ISSN: 2395-0072
www.irjet.net
Table 2.1.1 Specifications of solar PV panel
Sr .no
1
2
3
4
5
Description
Specification
Short circuit current
Voltage at MPP
Current at MPP
Open circuit voltage
Maximum power
2.0A
15
2.15
20V
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 without using micro controller. The nominal duty cycle of the main switch
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
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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
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International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019
p-ISSN: 2395-0072
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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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