Wind Turbine Blade-Angle Feedforward Control for Curtailment
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Solution Overview
Problem
Existing wind power installations face challenges in rapidly changing operating points, such as speed and power adjustments, which can lead to mechanical loads and vibrations, particularly when sudden changes are required for safety or network stability, and existing solutions often cause oscillations and delays.
Innovation Solution
Implementing a feedforward control method to adjust rotor blade angles directly to a target position without closed-loop feedback, using a model-based approach to minimize mechanical loads and ensure rapid transitions to new operating points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If closed-loop control is used to adjust operating points, then stability is improved, but response speed deteriorates
Solution Approach 1:
The feedforward control calculates the required blade angle adjustment in advance based on the target operating point, bypassing the iterative closed-loop process. This preliminary calculation enables direct actuation to the target state, achieving both rapid response and stability without oscillations.
2Productivity
If rapid operating point changes are implemented, then productivity is improved, but mechanical loads increase
Solution Approach 1:
The system optimizes the blade angle adjustment parameters by calculating the precise target blade angle based on the target operating point and current wind speed. This optimized parameter selection enables rapid transitions while minimizing mechanical stresses and vibrations on the rotor and tower.
Data Source
AI summary
A method for control of a wind power installation which is connected to an electrical supply network and which has a rotor with rotor blades which are adjustable in terms of their blade angle, is able to be operated at a variable speed and is prepared for generating an installation power from wind, wherein a blade angle control is provided for adjusting the blade angles, a closed-loop speed control is provided for closed-loop control of the speed, a closed-loop power control is provided for limiting the installation power, and the wind power installation is able to be operated at an operating point which can be specified, wherein the operating point is characterized at least by the speed and the installation power comprises operating the wind power installation at a first operating point with a first blade angle, checking for a curtailment request, where a reduction in the speed and/or installation power is requested, and if there is a curtailment request, determining a new operating point as the target operating point depending on the curtailment request, wherein the target operating point is characterized by a target speed and a target installation power, and determining a setpoint blade angle as the target blade angle for the target operating point, wherein in order to change the blade angle to the target blade angle, a feedforward control blade angle, or a feedforward adjustment rate describing an adjustment rate of the blade angle, is specified via a feedforward control blade angle control process, wherein the feedforward control blade angle control process gives the feedforward control blade angle or the feedforward control adjustment rate directly to the blade angle control for implementation.