Wind turbine down-regulation strategy for minimum wake deficit

Abstract

Down-regulation mode of wind turbine is commonly used no matter for the reserve power for supporting ancillary service to the grid, power optimization in wind farm or reducing power loss in the fault condition. It is also a method to protect faulty turbine. A down-regulation strategy based on minimum wake deficit is proposed in this paper, for the power improvement of the downwind turbine in low and medium wind speed region. The main idea is to operate turbine work at an appropriate operating point through rotor speed and torque control. The effectiveness of the strategy is verified by comparing with maximum rotor speed strategy. The result shows that the proposed strategy can improve the power of downwind turbine effectively. 

Dynamic wake tracking using a cost-effective LiDAR and Kalman filtering: Design, simulation and full-scale validation

“…Similar aspects of closed-loop control schemes apply for individual wind turbine de-rating. This type of active wake control is based on the philosophy of replacing greedy individual wind turbines control with collaborative interdependent wind turbine control schemes, which result in optimal wind farm performance [14,15]. Nonetheless, multi-beam scanning LiDARs are still relatively expensive rendering their use confined to research applications.…”

Review of wake management techniques for wind turbines

“…As reviewed by Kheirabadi and Nagamune, 2 the resulting power gains from implementing AIC in experiments have been inconsistent and appear marginal at best. The majority of studies are low‐fidelity simulations and analytical studies that use one of a few popular wake models to approximate the dynamics of wake–turbine and wake–wake interactions 32,34,36–38,41,42,45,49,53,54,59,61,63,65,66,68,70,74,75,77,82,85,89,91,93,94 . Some have used high‐fidelity computational fluid dynamics (CFD) 3,9,26,37,60,62,67,76,81,86,90 or specifically large eddy simulations (LES), 50,55 as well as scaled wind tunnel experiments, 33,39,40,47,48,52,56,69,79,91 and field tests 35,43,44,62,71 .…”

“…As the wake expands, any turbine positioned directly downstream will not be able to harvest this excess energy. Another reason that so many studies may be inadequate indicators of AIC's potential is that they test it with a single column of turbines aligned to the inflow 26,33,35,37–40,42,48,50,55,56,59,62,63,65,66,68–70,74,76,77,79–82,85,89,91,92,94 . While such an arrangement does provide a worst‐case scenario as a baseline, it may also be a worst‐case scenario for AIC because downstream turbines are not optimally placed to harvest the excess energy left by upstream‐derated turbines.…”

Wind Farm Power Optimization and Fault Ride-Through under Inter-Turn Short-Circuit Fault

“…The Min-C t strategy can be used in the derating mode to reduce the wake effects on the WF power. The strategy used in this paper was proposed in [27]. The process is shown in Figure 4.…”