Measurements and Simulation of a PV Pumping Systems Parameters Using MPPT and PWM Control Strategies

In this paper, we will introduce a new strategy of modeling and control of photovoltaic pumping systems under MATLAB/SIMULINK environment. This approach is based on the dynamic model of the "PV-MPPT adapter-inverter-asynchronous motor-pump". The MPPT control allows the extraction of the maximum output power delivered by the PV generator. However the inverter insures a PWM control of the asynchronous motor and a sine wave form of output signals. This methodology allows an optimal control and monitoring of continuous-continuous and continuous-alternative inverters by calculating the cyclic ratio of the DC-DC converter and the voltage/frequency (V/f) control law of the DC-DC inverter. This method leads to a best prediction of the behavior and performances of the photovoltaic plant especially in the case of climatic and load fluctuations