IRJET- Design Photovoltaic System with Constant Output using SEPIC Converter
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This document discusses the design of a SEPIC converter to provide constant output voltage from a photovoltaic system despite variations in temperature and sunlight intensity. A SEPIC converter was chosen because it can maintain the same output polarity as the input voltage. The SEPIC converter was designed with an 11V-20V DC input and 14.25V DC output. Simulation and hardware testing of the system confirmed that the SEPIC converter could effectively regulate the output voltage even as environmental conditions and load changed. The system uses a microcontroller to control the LCD display and implement PWM techniques for voltage regulation.
IRJET- Design Photovoltaic System with Constant Output using SEPIC Converter
- 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 915 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 ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract -The photovoltaic (PV) system gives variable output voltage due to temperatureandinsolationvariationwithrespectto time. This project 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 maintainingconstantoutput voltage. Key Words: PV module, Solar panel, Sepic converter, MPPT 1. INTRODUCTION Now a day everywhere in the world solar energy is use because of energy crisis. Solar provides carbon footprint per unit of energy production is 95% lower than that of fossil fuel power plants. For produces energysolarpanelsusedwhichcontentsPV module that converts solar energy into electricity and it gives variable output voltage due to temperature and insolation variation with respect to time. This project presents the designofa SEPICconverterforgettingconstantoutputvoltagefromPV system using a simple control circuit. The SEPIC is a DC to DC converter in which the output voltage is having same polarity asthatofinputvoltage.One benefitofthe SEPIC converter is that the input ripple current in the input capacitor is continuous. This reduces the amount of input capacitance necessary for low-ripple voltage, which reduces EMI (Electro MagneticInterference).SEPICconverter maintainsa fixed output voltage regardless of whether the input voltage. It is difficult to maintain constant output from PV module during all hours in a day .In recent years; many research works have addressed development of solar system. In a SEPIC with PV module input & peak current module control has been developedincludingsmall signal model ofSEPIC, PVvoltagecontroller& MPPT controller. 2.1.1 Solar 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. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 916 2.1.2 SEPIC CONVERTER A SEPIC is used as power factor correction stage is good solution for power supplies in electronic blasts. SEPICconverteristhe 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 attheMPPT.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. Sr .no Description Specification 1 Input Voltage 11V DC -20V DC 2 Output Voltage Switching 14.25V DC 3 Output Current 1.42A 4 Ripple 40% 5 Duty Cycle range 0.55 to 0.42 6 Switching frequency 330KHz Table 2.1.2 specifications of SEPIC converter 2.2.3 CONTROLLER The Atmel 8-bit AVR RISC-based microcontroller combines 32 kB ISP flash memory with read-while-write capabilities, 1 kB EEPROM, 2 kB SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented 2-wire serial interface, SPI serial port, 6-channel 10-bit A/D converter(8-channels in TQFP and QFN/MLF packages), programmable watchdog timer with internal oscillator, and five software selectable powersavingmodes.Thedeviceoperates between 1.8-5.5 volts. In this project two controllers are used one is for controlling LCD, voltage control another is used for PWM techniques 2.2 SIMULATION FIGURE 2.2 SIMULATION OF SYSTEM
- 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 917 2.3 ACTUAL SETUP 3. CONCLUSION According to this system, this project has introduced hardware implementation of DC-DC SEPIC converter for applications of renewable energy using PWM based charge controller. The solar panels output voltage is varying, hence for getting or maintaining the constant output voltage, the PWM based charge controller using SEPIC converters are used. By using extra inductors and capacitors in the SEPIC converter, high voltage gain and low current undulation are produced. Therefore, efficiency of the proposed converter is increased. By adjusting the range of dc voltage, SEPIC converters are allowed to maintain constant output voltage. By using hardwareimplementation,performinganoperationoftheproposedsystem.Alsoat environmental condition and changing load, SEPIC converter gives the constant output voltage. REFERENCES 1) Chiang. S. J, Hsin-Jang Shieh and Ming-Chieh Chen, “Modeling and Control of PVChargerSystemwithSEPICConverter”,IEEE Transactions on Industrial Electronics, Vol. 56, No. 11, November 2009.pp 4344-4353. 2)Shu-Hung Chung, K. K. Tse, S. Y. Ron Hui, Fellow, C. M. Mok, and M. T. Ho, A Novel Maximum PowerPointTrackingTechnique for Solar Panels Using a SEPIC or Cuk Converter, IEEE Transactions on PowerElectronics,Vol.18,No.3,pp.717-724.May2003, 3) Sombuddha Chakraborty, Amit Kumar Jain, and Ned Mohan, “A Novel Converter Topology for Multiple Individually Regulated Outputs”, IEEE Transactions on Power Electronics, Vol. 21, pp. 361-369. No. 2, 2006, 4) K. M. Tsang and W. L. Chan “ Fast Acting Regenerative DC Electronic LoadBasedona SEPICConverter”IEEETransactionsOn Power Electronics, Vol. 27, No. 1, January 2012 5) S.venkatanarayanan, M. Saravanan” Design and implementation of low cost sepic photovoltaic systemforconstantvoltage”