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access icon free Active yaw control in a horizontal axis wind system without requiring wind direction measurement

© The Institution of Engineering and Technology
Received 10/01/2016, Accepted 09/06/2016, Revised 08/06/2016, Published 10/06/2016

This study presents an improved active yaw control technique for a horizontal-axis wind turbine that is driven by a full power converter system with maximum power point tracking control. The turbine is aligned to the wind direction through the error between the rotor speed determined by the optimal tip speed ratio and the real rotor speed commanded by the maximum power point tracking control. Thus, the implementation of the yaw control is not based on the measurement of the wind direction and therefore, it is not influenced by inaccuracies that may be caused by the vortex flow downstream of the blades. The proposed yaw control method is intended for large turbines, since larger increase in the generated electric energy can be attained. However, since it is cost-effective, it is affordable to be applied in low power wind systems. Selective simulation and experimental results are presented in order to demonstrate the effectiveness and the resulting improvements of the proposed control scheme. The simulation analysis is conducted in a large wind turbine with permanent magnet synchronous generator and the experimental verification in a low power real wind system with squirrel cage induction generator. However, it can also be applied to a doubly fed induction generator.

Inspec keywords: rotors; wind power plants; permanent magnet generators; vortices; maximum power point trackers; angular velocity control; asynchronous generators; power generation control; wind turbines; synchronous generators

Other keywords: horizontal-axis wind turbine; rotor speed; doubly fed induction generator; electric energy; permanent magnet synchronous generator; full power converter system; squirrel cage induction generator; low power wind systems; horizontal axis wind system; active yaw control technique; maximum power point tracking control; optimal tip speed ratio; blade vortex flow

Subjects: Synchronous machines; DC-DC power convertors; Wind power plants; Velocity, acceleration and rotation control; Control of electric power systems; Asynchronous machines

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