Variable Step Size Perturb and Observe MPPT for PV Solar Applications

Awang Bin Jusoh, Omer Jamal Eldin Ibrahim Mohammed, Tole Sutikno


In order to deliver maximum output of photovoltaic (PV) cells, the usage of maximum power point tracking (MPPT) is essential. The speed and stability of the tracking technique are highly desired. Perturb and Observe (P&O) is one of the most common tracking techniques, but it suffers from the slow tracking speed at small duty cycle step and fluctuates when subjected with large duty step, which results in higher losses under dynamic weather to which the photovoltaic (PV) cells exposed. In this paper, variable step size Perturb and Observe is introduced throughout Matlab/Simulink simulation to overcome this problem to achieve higher efficiency, reliable tracking accuracy and higher speed under fast changing weather. In comparison with other variable P&O techniques, the proposed method features a dynamic step size for more tracking efficiency and accuracy. Double diode modelling is used in this technique for better photovoltaic (PV) cell’s characteristic prediction. In this study, the adapted technique had been tested to wide range of sun irradiance and operation temperatures.

Full Text:



Emilio Mamarelis, Giovanni Petrone, Giovanni Spagnuolo, “Two-steps algorithm improving the P&O steady state MPPT efficiency”, Applied Energy, Vol. 113, January 2014, pp. 414–421.

Jancarle L. Santos, Fernando Antunes, Anis Chehab, Cícero Cruz, A, “Maximum power point tracker for PV systems using a high performance boost converter”, Solar Energy, Vol. 80, Issue 7, July 2006, pp.772–778.

Ali Akbar Ghassami, Seyed Mohammad Sadeghzadeh, Asma Soleimani, “A high performance maximum power point tracker for PV systems”, International Journal of Electrical Power & Energy Systems, Vol. 53, December 2013, pp. 237–243.

Pallavee Bhatnagar, R K Nema, “Maximum power point tracking control techniques: State of art in PV application”, Renewable and Sustainable Energy Reviews, Vol. 23, July 2013, pp. 224–241.

Liu, X., Lopes, L.A.C., “An improved perturbation and observation maximum power point tracking algorithm for PV arrays”, Power Electronics Specialists Conference, PESC04, Vol. 3, 2004, pp. 2005–2010