Maximum Wind Energy Capture Research Articles

Neural-Network-Based Sensorless Maximum Wind Energy Capture With Compensated Power Coefficient

This work describes a small wind generation system where neural network principles are applied for wind speed estimation and robust maximum wind power extraction control against potential drift of wind turbine power coefficient curve. The new control system will deliver maximum electric power to a customer with lightweight, high efficiency, and high reliability without mechanical sensors. A turbine directly driven permanent magnet synchronous generator (PMSG) is considered for the proposed small wind generation system in this paper. The new control system has been developed, analyzed and verified by simulation studies. Performance has then been evaluated in detail. Finally, the proposed method is also applied to a 15 kW variable speed cage induction machine wind generation (CIWG) system and the experimental results are presented.

Intelligent control for large-scale variable speed variable pitch wind turbines

Large-scale wind turbine generator systems have strong nonlinear multivariable characteristics with many uncertain factors and disturbances. Automatic control is crucial for the efficiency and reliability of wind turbines. On the basis of simplified and proper model of variable speed variable pitch wind turbines, the effective wind speed is estimated using extended Kaiman filter. Intelligent control schemes proposed in the paper include two loops which operate in synchronism with each other. At below-rated wind speed, the inner loop adopts adaptive fuzzy control based on variable universe for generator torque regulation to realize maximum wind energy capture. At above-rated wind speed, a controller based on least square support vector machine is proposed to adjust pitch angle and keep rated output power. The simulation shows the effectiveness of the intelligent control.

A generating wind scheme for maximum energy capture and minimum cost

This paper proposes a cheap, maintenance-free generator suitable for maximum wind energy capture. It can be designed for low speed applications, where it could be rigidly coupled to a Sandia-17-m Darrieus wind turbine without the need of a gearbox. The generator is operated at varying shaft speeds between 38 rpm and 76 rpm. Its torque is regulated so that energy extraction is maximized over the whole variable speed range of the turbine, by controlling two switching angles (switch-on and switch-off angles of the generator's excited phase winding). This generating system may be either connected to the main grid via a simple electronic circuit to provide a good quality power or to a storage battery for generating electrical energy at remote areas.