Abstract
Reasonable active power dispatch for wind farms can reduce the dynamic fatigue loads of wind turbines (WTs) and prolong the service lives of the WTs. An active power dispatch method for wind farms based on the improved fatigue load sensitivity of WT is proposed. According to the WT operating parameters, the fatigue load sensitivity to the power reference value is improved. The analytical equations of the fatigue load sensitivity are rederived, and the accuracies of the fatigue load sensitivity calculations are improved. The wind farm fatigue load minimization is taken as the target, the tracking power reference value is taken as the constraint, and the active power distribution model is established. The quadratic programming optimization algorithm is used to calculate the power reference of each WT. Case studies were conducted with wind farm control for different turbulent winds. The effectiveness of the proposed method is verified by comparing the rainflow cycles and the damage equivalent load.
Highlights
With the increasing penetration level,1–3 the uncertainty of wind power has brought new technical challenges to power system operation.4–7 For the active power, the wind farm should be able to track grid dispatching commands
The traditional active power dispatch method of wind farms only considers the tracking power reference value and dispatches the power of each wind turbines (WTs) according to the available power ratio of the WT,10,11 regardless of the impact of the fatigue load generated by the dynamic stress on the WT life
An active power dispatch method based on improved fatigue load sensitivity (IFLS) is proposed, aiming at reducing the fatigue loads of wind farms
Summary
With the increasing penetration level, the uncertainty of wind power has brought new technical challenges to power system operation. For the active power, the wind farm should be able to track grid dispatching commands. The development of an active power dispatch method that can track the power reference value and reduce the fatigue load has an important application value for prolonging the service life of the wind farm.. The power reference tracking is considered in some dispatch methods proposed by Gionfra et al., and the fatigue load experienced by the WT is not considered. In addition to tracking the power reference, mechanical loads are minimized by coordinating generator torque and the pitch angle in some methods proposed by Berglind et al.. An improved fatigue load sensitivity (IFLS) based optimal active power dispatch method is proposed for wind farms to overcome the aforementioned problems. Simulation results in different wind conditions show that the fatigue loads experienced by the wind farm are reduced using the proposed method.
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