Optimization of a Photovoltaic Pumping System Using Fuzzy Logic and Passivity-Based Control

This paper presents an optimization approach for a photovoltaic (PV) pumping system composed of a PV generator, a pulse-width modulation (PWM) inverter, and a permanent magnet synchronous motor (PMSM) coupled to a centrifugal pump. The control strategy is based on frequency and speed regulation using passivity-based control, which enables the system to respond dynamically to variations in solar irradiance and temperature without the use of a DC/DC converter. A fuzzy logic controller (FLC) ensures closed-loop speed regulation, aligning motor speed with the reference corresponding to the PV generator’s maximum power point. This approach maximizes pump flow rate and improves the global system’s efficiency. The proposed model has been implemented in the Matlab/Simulink environment. The results show the effectiveness of the control approach to increase the performance of the photovoltaic pumping system.