An Improved Feed Forward PWM Control for MPPT of Solar PV Systems Under Varying Atmospheric Conditions

Yıl 2015, Cilt: 5 Sayı: 4, 1164 - 1173, 01.12.2015

P. Sathya R. Natarajan

Öz

The objective of this paper is to harvest maximum power from the solar panel using voltage based MPPT circuit for low power application under varying atmospheric conditions.  A voltage based tracking system consisting of a voltage sensor, DC-DC boost converter, maximum power point tracker and a LED lighting load is designed and developed. The analog MPPT controller using direct feed forward PWM control signal for DC-DC converter operated in the continuous conduction mode is the principle block performing the tracking operation. Since the output of solar panel is nonlinear, the optimal power point will vary due to change in irradiance and temperature. Irrespective of the change in atmospheric conditions, the voltage sensor developed here has the ability to generate accurate reference voltage in accordance with the panel output and thereby maintains maximum power at the load. The experimental results have proved a power conversion efficiency of 95.46 % in clear sky condition, and (90.49 to 93.78) % in partial shading conditions resulting from the feed forward control technique employed in the MPPT circuit. The proposed tracking system is less complex and low cost one that has high tracking efficiency with less fluctuation in real time dynamic conditions. 

Anahtar Kelimeler

Boost converter; Feed forward; MPPT; Pulse width modulation (PWM); Power conversion efficiency

Kaynakça

• B. Subudhi, and R. Pradhan, “A Comparative Study on Maximum Power Point Tracking Techniques for Photovoltaic Power Systems”, IEEE Transactions on Sustainable Energy, vol. 4, no.1, pp. 89-98, January 2013. [2] R. A. Reza, M. M. Hassan, S. Jamasb , “ Classification and comparison of maximum power point tracking techniques for photovoltaic system: a review”, Renew. Sustain. Energy Rev., vol.19, pp. 433-443, 2013.
• T. Tafticht, K. Agbossou, M.L. Doumbia, A. Cheriti, “An improved maximum power point tracking method for photovoltaic systems”, Renew. Energy, vol.33, pp.1508- 1516, 2008.
• F. Liu, S. Duan, F. Liu, B. Liu, Y. Kang, “A variable step size INC MPPT method for PV systems”, IEEE Trans. Indus. Electron. Vol.55, no.7, pp. 2622-2628, 2008
• B. N. Alajmi , K. H. Ahmed , S. J. Finney, and B.W. Williams, “Fuzzy logic control approach of a modified hill –climbing method for maximum power point in micro-grid standalone photovoltaic system”, IEEE Trans. Power Electron, vol.26, no.4, pp.1022-1030, 2011
• M. R. Vincheh , A. Kargar, G. A. Markadeh, “A Hybrid Control Method for maximum power point tracking (MPPT) for Photovoltaic Systems”, Arab. J. SCi. Eng., vol.39, pp. 4715-4725, 2014.
• M.A. Abido, M. Sheraz Khalid, M.Y. Worku, “An efficienct ANFIS based PI controller for Maximum power point tracking of PV systems”, Arab. J. SCi. Eng., Vol.40, pp.2641-2651, 2015.
• J. Ahmad, and H. J. Kim, “ A Voltage Based Maximum Power point Tracker for Low Power and Low cost Photovoltaic Applications”, World Academy of Science, Engineering and Technology, vol. 60, pp. 712-715, 2009 [9] O. L. Laperia, M.T. Penella, M. Gasulla, “ A new MPPT method for low power solar energy harvesting”, IEEE Trans. Ind. Electron., vol.57, no.9, pp.3129-3138, 2010
• P. Sathya, R. Natarajan, S. Kothari, “Analog Maximum power point tracker using constant reference voltage technique”. Int. J. Applied Eng. Research, vol.8, no.14, pp.1677-1684, 2013
• P. Sathya, and R. Natarajan, , “Design and Implementation of 12V/24V Closed loop Boost Converter for Solar powered LED Lighting System”. Int. J. Eng. & Technology, vol.5, no.1, pp.254-264, March 2013.
• K. Ishaque, Z. Salam, A. Shamsudin and M. Amjad, “ A direct control based maximum power point tracking method for photovoltaic system under partial shading conditions
• algorithm”, Applied Energy, vol.99, pp. 414-422, June 2012 Swarm
• optimization [13] R. Leyva, C. Olalla, H. Zazo, C. Cabal, A. Cid-Pastor, I. Queinnec, and C. Alonso, “MPPT Based on Sinusoidal Extremum- Seeking control in PV Generation”, International Journal of Photoenergy, vol.12, pp.1155-1162, 2012
• M. Boztepe, F. Guinjoan, G. Velasco- Quesada, S. Silvestre, A. Chouder, and E. Karatepe, “ Global MPPT scheme for Photovoltaic string Inverters based on Restricted Voltage Window Search Algorithm”, IEEE Transactions on Industrial Electronics, vol. 61, no.7, pp. 3302-3312, July 2014.
• N. Gokmen, E. Karatepe, F. Ugranli, and S. Silvestre, “Voltage band based global MPPT controller for photovoltaic systems”, Solar Energy, vol. 98, pp. 322- 334, November 2013.
• L. Cristaldi, M. Faifer, M. Rossi, and S. Toscani, “ An Improved Model- Based Maximum Power Point Tracker for Photovoltaic Panels”, IEEE Transactions on Instrumentation and Measurement, vol. 63, no.1, pp. 63-71, January 2014.
• M. H. Rashid, Power Electronics: Circuits, Devices and Applications, 3rd edition, 11th impression, Pearson education, pp. 190-194, 2012.
• D. Roy Choudhury, Linear Integrated Circuits, 2nd edition, New Age International Publishers, ch.5 & 8, 2007.