MODELLING AND SIMULATION OF PHOTOVOLTAIC PUMPING SYSTEMS UNDER MATLAB SIMULINK

Z. Hamadi, J. Moncef, H. Néjib, and A. Cherif

Keywords

MPPT, PWM, modelling, MATLAB/SIMULINK

Abstract

In this paper, we will observe by simulation and experimental results how good monitoring and control of a PV plant can increase its efficiency and reliability and consequently reduce the PV cost. We introduce a new strategy of modelling and control of photovoltaic pumping systems under MATLAB/SIMULINK environment. This approach is based on the dynamic model of the “PV-MPPT inverterMLI inverter-motor-pump association. The MPPT control allows extraction of the maximum output power of the PV cell. However, the PWM inverter ensures a sine wave current to the AC motor with a low distortion ratio. This methodology provides an optimal control of DC/DC and DC/AC converters thanks to dynamic control laws, respectively, the DC-DC cyclic ratio and the inverter frequency. It is programmed in a MATLAB-SIMULINK interface for best prediction of the PV system behaviour, especially with climatic and load fluctuations. The simulation results are validated by experimental measurements that are collected from several standalone PV plants.

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