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The research presented in this paper involves the design of a power control system for a hydrokinetic turbine previously tested in real operating conditions. A maximum power point tracking (MPPT) algorithm was designed and simulated using the required parameters for a specific electric generator. The proposed system consists of a generator connected to the hydrokinetic turbine, a three-phase uncontrolled rectifier, a direct current (DC) boost converter with MPPT control to extract maximum available power, and a buck converter to control the amount of power delivered to the load. In order to test the MPPT algorithm, we built the individual blocks on the basis of the corresponding equations of each component. The algorithm considered the specific parameters of the previously tested turbine as input data and simulated the same water velocities for which the turbine had been tested. Thus, the simulation predicted a power output of 105 W for a water velocity of 1.33 m/s, 60 W for 1 m/s, and 30 W for 0.83 m/s. The efficiency of the control system was demonstrated when the instantaneous power value was maintained at a maximum point, regardless of the rotational speed according to the experimental power curves of the driving rotor obtained for certain water velocities.
Rareș-Andrei Chihaia; Ionuț Vasile; Gabriela Cîrciumaru; Sergiu Nicolaie; Emil Tudor; Constantin Dumitru. Improving the Energy Conversion Efficiency for Hydrokinetic Turbines Using MPPT Controller. Applied Sciences 2020, 10, 7560 .
AMA StyleRareș-Andrei Chihaia, Ionuț Vasile, Gabriela Cîrciumaru, Sergiu Nicolaie, Emil Tudor, Constantin Dumitru. Improving the Energy Conversion Efficiency for Hydrokinetic Turbines Using MPPT Controller. Applied Sciences. 2020; 10 (21):7560.
Chicago/Turabian StyleRareș-Andrei Chihaia; Ionuț Vasile; Gabriela Cîrciumaru; Sergiu Nicolaie; Emil Tudor; Constantin Dumitru. 2020. "Improving the Energy Conversion Efficiency for Hydrokinetic Turbines Using MPPT Controller." Applied Sciences 10, no. 21: 7560.
The objective of the paper is to study the influence of certain shroud types suitable for horizontal axis hydrokinetic turbines using experimental testing in order to increase the energy conversion efficiency. The scale model of the shrouded hydrokinetic turbine is tested on a dedicated experimental bench for axial hydraulic turbine models. Two types of shrouds were tested in order to be compared: convergent shroud and divergent shroud. The rotor and shroud were made using 3D printer technology and were tested at a water velocity of 0.9 m/s on the closed-circuit testing bench. The testing facility allows the determination of the power extracted for each shroud at five distinct positions. Thus, the rotor can be moved within the shroud from inlet to outlet in order to establish the proper operating position. The mechanical power is measured using a torque transducer and an electromagnetic particle brake. The testing results will be analysed based on the variation of power curves obtained for different shroud types and operating positions. The optimum design and the best operating position will be recommended by comparing the testing result with the data collected from the bare turbine using the same rotor placed directly in free flow.
Rareş-Andrei Chihaia; Lucia-Andreea El-Leathey; Gabriela Cîrciumaru; Nicolae Tănase. Increasing the energy conversion efficiency for shrouded hydrokinetic turbines using experimental analysis on a scale model. E3S Web of Conferences 2019, 85, 06004 .
AMA StyleRareş-Andrei Chihaia, Lucia-Andreea El-Leathey, Gabriela Cîrciumaru, Nicolae Tănase. Increasing the energy conversion efficiency for shrouded hydrokinetic turbines using experimental analysis on a scale model. E3S Web of Conferences. 2019; 85 ():06004.
Chicago/Turabian StyleRareş-Andrei Chihaia; Lucia-Andreea El-Leathey; Gabriela Cîrciumaru; Nicolae Tănase. 2019. "Increasing the energy conversion efficiency for shrouded hydrokinetic turbines using experimental analysis on a scale model." E3S Web of Conferences 85, no. : 06004.