" Effect of Improving Perturb and Observe MPPT Algoritm on AC Grid Connected PV Systems

Öz

Photovoltaic energy systems have an important role in electricity generation. Although photovoltaic systems are renewable, environmentally-friendly, silent and non-fuelled, they still have various disadvantages such as high investment cost and low efficiency. In order to get highest efficiency from photovoltaic systems in different operation conditions, solar panels and arrays should be operated at maximum power points. At maximum power point, solar arrays generate the electric energy at maximum efficiency and minimum losses. Some algorithms are used in photovoltaic systems to provide maximum efficiency and minimum losses. The perturbation and observation (P&O) algorithm have been well known algorithm. Although it is an easily applicable algorithm, it has important ripple problems when it reaches to maximum power point. This paper introduces an improvement on conventional P&O algorithm to eliminate ripple problem and it applied on grid connected system. In this approach, ripples are eliminated by obtaining reference current value under variable and constant solar irradiation conditions. This algorithm proposes variable power perturbation with fill factor. In the end, it was evaluated along with simulation, experimental results

Anahtar Kelimeler

• DC-AC power converters, maximum power point tracking, P&O algorithm, solar power generation

Kaynakça

1. Alcaraz G.G., Galvan E.i Gonzalez N., Javadi M.S., " Renewable energy resources short-term scheduling and dynamic network reconfiguration for sustainable energy consumption", Renewable and Sustainable Energy Reviews, vol. 52, no. 2015, pp. 256-264. August, 2015.
2. Thayalan D.T., Lee H., Park J.H., "Low-Cost HighEfficiency Discrete Current Sensing Method Using Bypass Switch for PV Systems", IEEE Transactions on Instrumentation and Measurement, vol.63, no.4, pp. 769-780, April, 2014.
3. Koutroulis E., Blaabjerg F., " A New Technique for Tracking the Global Maximum Power Point of PV Arrays Operating Under Partial-Shading Conditions", IEEE Journal of Photovoltaics,vol.2,no. 2, pp. 184-190. April, 2012.
4. Subudhi B., Pradhan R., " A Comparative Study on Maximum Power PointbTracking Techniques for Photovoltaic Power Systems", IEEE, Transactions on Sustainable Energy, vol. 4, no. 1, pp. 89-98. January, 2013.
5. Nabulsi A., Dhaouadi R., " Efficiency Optimization of a DSP-Based Standalone PV System Using Fuzzy Logic and Dual-MPPT Control", IEEE Transactions on Industrial Informatics, vol. 8, no. 3, pp. 573-584. August, 2012.
6. Esram T., Chapman PL., "Comparison of photovoltaic array maximum power point tracking techniques", IEEE Transactions on Energy Conversion, vol. 22, no. 2, pp. 439449, June, 2007.
7. Özçelik M.A., Yılmaz A.S., "Improving the performance of MPPT in PV systems by modified Perturb-and-Observe algorithm"(DC side), Journal of Engineering Research, vol.3, no.5, pp.-77-96, September, 2015.
8. Guerra A.,Zhang J., "GaN Power Devices for Micro inverters", Power Electronics Europe, Issue 4, page 28-31, June, 2010.

9. Barchowsky a., Jeffrey P.P., Grogery F. Reed, Mathew J. Korytowski, Brandon M. Grainger. "A comparative study of mppt methods for distributed photovoltaic generation", IEEE Innovative Smart Grid Technology, Washinton, USA, page 17, 16-20 January, 2012.
10. Pandey A, Dasgupta N, Mukerjee A.K, "A Simple-Sensor MPPT Solution", IEEE Transactions on Power Electronics, vol.22, no.2, pp. 698-700, March, 2007.
11. Ding K, Bian X, Liu H, Peng T, "A Matlab-Simulink-Based PV module Model and Its Application Under Conditions of Non uniform Irradiance", IEEE Transactions on Energy Conversion, vol.27, no.4, pp. 864-872, 2012.
12. Burger, B.; Kranzer, D.; "Extreme high efficiency PV power converters", Power Electronics and Applications. EPE’09.13 th European Conference, Freiburg, Germany, pp. 1-13, 8-10 September, 2009.
13. Zainuri M., Radzi M., Soh A.C., Rahim N.A., "Development of adaptive perturb and observe-fuzzy control maximum power point tracking for photovoltaic boost dc-dc converter", IET Renewable Power Generation, 8; 2; pp.183-194, March, 2014.
14. Kashif I, Zainal S., " A Review of maximum power point tracking techniques of PV system for uniform insolation and partial shading condition". Renewable and Sustaniable Energy Review, vol.19, pp. 475-488, January, 2013.
15. Weidong X, Dunford WG, Palmer RP,Capel A.," Application of centered differentiation and steepest descent to maximum power point tracking". IEEE Transactions on Industrial Electronics,vol. 54, no.5, pp. 2539-2549, October, 2007.
16. Onat N., Recent Developments in Maxim. Power Point Tracking Technologies for Photovoltaic Systems. International Jour. of Photoenergy, vol. 2010, pp.1-14, article ID 245316,November, 2010.
17. Kulkarni A., John V., "Mitigation of Lower Order Harmonics in a Grid-Connected Single-Phase PV Inverter", IEEE Transactions on Power Electronics, 28; 11; pp.5024-5037, November, 2013.