scholarly journals A Fuzzy Adaptative Backstepping Control Strategy for Marine Current Turbine under Disturbances and Uncertainties

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6550
Author(s):  
Xusheng Shen ◽  
Tao Xie ◽  
Tianzhen Wang
Keyword(s):  
Backstepping Control ◽  
Pi Control ◽  
Adaptive Backstepping ◽  
Adaptive Backstepping Control ◽  
Control Approach ◽  
Power Extraction ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Simulation Results ◽  
Current Turbine

Marine current energy is attracting more and more attention in the world as a reliable and highly predictable energy resource. However, conventional proportional integral (PI) control will be sensitive to the numerous challenges that exist in a marine current turbine system (MCTs) such as marine current disturbance, torque disturbance and other uncertain parameters. This paper proposes a fuzzy adaptive backstepping control (F-A-BC) approach for a marine current turbine system. The proposed F-A-BC strategy consisted of two parts. First, an adaptive backstepping control approach with the compensation of disturbance and uncertainty was designed to improve anti-interference of the MCT so that the maximum power point tracking (MPPT) was realized. Then, a fuzzy logic control approach was combined to adjust parameters of an adaptive backstepping control approach in real time. The effectiveness of the proposed controller was verified by the simulation of a direct-drive marine current turbine system. The simulation results showed that the F-A-BC has better anti-interference ability and faster convergence compared to the adaptive backstepping control, sliding mode control and fuzzy PI control strategies under disturbances. The error percentage of rotor speed could be reduced by 3.5% under swell effect compared to the conventional controller. Moreover, the robustness of the F-A-BC method under uncertainties was tested and analyzed. The simulation results also indicated that the proposed approach could slightly improve the power extraction capability of the MCTs under variable marine current speed.

Numerical Simulations in the Design of a New Tension-Tethered Marine Current Turbine

2014 ◽  
Author(s):  
David Fernandez ◽  
Jaime Moreu ◽  
Santiago de Guzman ◽  
Ronald W. Yeung ◽  
Manuel Moreu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Test Model ◽  
Pressure Distributions ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Computational Fluid Dynamics Cfd ◽  
Marine Currents ◽  
Simulation Results ◽  
Current Turbine

This paper focuses on the applicability of different Computational Fluid Dynamics (CFD) software for the design of marine current turbines. As part of the conceptual design process, Seaplace has carried out a detailed numerical and experimental hydrodynamic program to optimize a new Tension-Tethered Turbine concept for harnessing energy from marine currents. Three different codes have been assessed, based on the demands from each phase: OpenProp, TurbProp, and ANSYS® CFX®. The paper provides an extensive summary of the main outcomes from the turbine optimization process to achieve highest efficiencies. A description of the tested geometries and the implementation of TurbProp to account for inline turbine solutions is included. Simulations for the test-model and prototype scales have been performed, with the pressure distributions, flow streamlines and power coefficients presented as primary results. The influence of simulation results on the final turbine configurations is discussed.

CFD Investigation of Performance for Marine Current Turbine Based on RANS Simulations

2009 ◽  
Vol 419-420 ◽  
pp. 309-312 ◽  
Author(s):  
Rui Jun Fan ◽  
J.R. Chaplin ◽  
Guang Jun Yang
Keyword(s):  
Pitch Angle ◽  
Compressible Flows ◽  
Structured Grids ◽  
Numerical Predictions ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Simulation Results ◽  
Volume Method ◽  
Current Turbine ◽  
Blade Pitch Angle

This paper presents the 3D CFD computation of an 800mm diameter model of MCT based on structured grids, RANS equations and turbulence model. A time-accurate, upwind, finite volume method for computing compressible flows on structured grids is presented. Numerical predictions for a series of blade pitch angle settings and speeds are compared with the other simulation results of commercial software, verified by the experimental measurement of the model. Such results provide confidence in using the CFD computation tools to develop the forthcoming design of MCT.

scholarly journals Adaptive backstepping control for ship nonlinear active fin system based on disturbance observer and neural network

2022 ◽  
Vol 12 (2) ◽  
pp. 1392
Author(s):  
Nguyen Thai Duong ◽  
Nguyen Quang Duy
Keyword(s):  
Neural Network ◽  
Disturbance Observer ◽  
Negative Impact ◽  
Basic Function ◽  
Backstepping Control ◽  
Adaptive Backstepping ◽  
Adaptive Backstepping Control ◽  
Ship Roll ◽  
Simulation Results ◽  
Reduction Effectiveness

<span>Adaptive backstepping control based on disturbance observer and neural network for ship nonlinear active fin system is proposed. One disturbance observer is given to observe the disturbances of the system, by this way, the response time is shorten and the negative impact of disturbance and uncertain elements of the system is reduced. In addition, radial basic function neural network (RBFNN) is proposed to approach the unknown elements in the ship nonlinear active fin system, therefor the system can obtain good roll reduction effectiveness and overcome the uncertainties of the model, the designed controller can maintain the ship roll angle at desired value. Finally, the simulation results are given for a supply vessel to verify the successfulness of the proposed controller.</span>

Sign in / Sign up

Export Citation Format

Share Document