Systems and methods for optimal phase shift between dynamic control actions for wind turbines
| DWPI Title: Wind farm control system for controlling wind turbine farm operations and controls e.g. dynamic wake control, has first control module for controlling rotor speed and collective pitch control of first wind turbine |
| Abstract: Dynamic wake control (or dynamic induction control) is used to promote wake breakdown and recovery behind a wind turbine that improve wind farm performance/efficiency. Constructive interference is created by simultaneously performing harmonic rotor speed control and harmonic collective pitch control so that the phase of the rotor speed perturbations leads the phase of the collective pitch perturbations by 90-135 degrees. |
| Use: Wind farm control system for controlling wind turbine farm operations and controls i.e. dynamic wake control. |
| Advantage: The harmonic oscillation is introduced by an active wake control, that promotes wake breakdown and recovery behind a wind turbine by periodically forcing the wake flow using rotor speed control and collective pitch control. The harmonic actuation of the rotor speed and collective pitch control are set in tandem with the phase of the rotor speed perturbations leading the phase of the collective pitch perturbations by a 90-135 degrees so that the synergistic effects of the actions at this phase shift reduces the near-wake length of a wind turbine more than either of the individual actions. The system can improve the benefit of optimal forcing strategies that encourage wake recovery. The system can provide dynamic wake control (DWC) to promote wake breakdown and recovery behind a wind turbine by dynamic forcing of the wake to excite instability modes, which is performed by introducing an oscillation into the wake flow at an appropriate frequency to amplify the tip vortex instability and accelerate wake breakdown and recovery. |
| Novelty: The system has a first control module for controlling rotor speed and collective pitch control of a first wind turbine (100). A second control module is used for determining downstream turbine energy efficiency changes at a downstream turbine resulting from periodically changing the rotor speed and collective pitch control between a time period of two set points to excite inherent fluid dynamic instabilities in the wake (300) and decrease wake length. The first controller is used to oscillate the rotor speed and collective pitch provides constructive aerodynamic interference from harmonic actuation of the rotor speed and collective pitch being performed in tandem with the phase of the rotor speed perturbations leads the phase of the collective pitch perturbations by a 90-135 degrees such that synergistic effects of actions at this phase shift reduces the near-wake length of the wind turbine more than either of the individual actions. |
| Filed: 1/10/2023 |
| Application Number: US18095358A |
| Tech ID: SD 15714.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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