Comparative design of fuzzy logic controller for photovoltaic panel maximum power point tracking

The highly effectiveness of Fuzzy Logic Controlling FLC method is clearly demonstrating and proved in literature confirming FLC priority in Maximum Power Point Tracking MPPT application. Based on this fact, this paper focuses on study and analyzes the effect of input and output variables' membership modifications on the quality of FLC performance. To demonstrate this effect, the other related parameters such as fuzzy inference rules, and the x-axis divisions and limits of the memberships all are kept constant. MATLAB/Simulink software is adopted to do the simulation and to control the duty cycle D and consequently to control the pulse width modulation gate drive pulses width of Buck-Boost DC-DC converter. From the collected results, it is found that the delivered load powers are different between the two cases of different membership shapes to confirm and indicate the positive effect of the proposed modifications in the second membership shape.