Comparative study of effectiveness between MPPT regulations with optimal TSR and with neuro-fuzzy in the face of the torque impact of a Vertical Axis tidal turbines column with a PMSG

Sciences and Technologies

The objective of this article is to compare the effectiveness between the optimal TSR MPPT regulation strategy and the neuro-fuzzy MPPT one to control the column of turbines of a vertical axis tidal turbine facing the impact of its oscillated torque on the electromechanical quantities output of the PMSG such as rotational speed, currents and voltages. In this study, the turbine torque is determined by the DMST method. And, the Park model of the PMSG is used. In addition, the methods of regulating the turbine by the optimal TSR MPPT and by the neuro-fuzzy MPPT are studied. Each control strategy includes PI correctors and a PWM rectifier in the electrical chain. Three turbines mounted in a column with the same radius of 455mm and height of 824mm were considered. The simulation was carried out with operation at maximum average efficiency of the column of three turbines and a flow of 1.5 m/s. Without a control system, the rotational speed of the PMSG with the three non-offset turbines, when feeding a resistive and inductive load, has the amplitude more wavy compared to if they are offset. The output quantities of PMSG are improved by both regulation strategies. The MPPT neuro-fuzzy regulation mode is more effective than the MPPT one at optimal TSR. Due to the fact that the turbine produces the oscillating speed and that, unlike the MPPT strategy at optimal TSR, the MPPT neuro regulation mode -Fuzzy provides instant reference speed. A comparative study with other regulation strategies using instantaneous reference rotation speeds can be undertaken.

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