A new Fuzzy Logic architecture to control the DC-bus voltage in grid connected photovoltaic system

Abstract

The control strategy’ efficiency of single stage grid-connected PV system is important. This study suggest a novel Fuzzy logic controller to control and regulate the DC-bus voltage at its reference value under changing irradiance levels. Moreover, a fuzzy logic algorithm is employed to extract the maximum power from the photovoltaic array and to provide the reference value of DC-bus voltage. Thus, a comparative analysis between the proposed and proportional integral controllers is made to prove the effectiveness of the developed controller. Furthermore, to validate the superiority of the proposed Fuzzy Logic controller, simulations were carried out at Matlab/Simulink environment. Finally, the simulation results prove that the proposed controller gives better performance in response time, rate of overshoot and tracking efficiency regarding the proportional integral controller. In addition, a comparison in term of Total Harmonic Distortion of current is asses, it demonstrate that the control strategy with the developed Fuzzy Logic gives less value compared to that with the PI controller.