Variable Blade Angle Adjustment Rate Limit for Wind Turbine Load Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wind power plants face excessive loads and rotational speeds due to spontaneous blade angle adjustments towards 0°, leading to potential damage and reduced lifespan, as existing control methods lack dynamic adjustment based on operating and environmental parameters.
Innovation Solution
Implementing a variable blade angle adjustment rate limit that adjusts depending on rotor rotational speed and environmental factors, such as wind speed and direction, to prevent excessive blade angle changes, with separate limits for positive and negative adjustments, and a control device to manage these limits dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blade angle adjustment rate is restricted by a pre-settable blade angle adjustment rate limit, then excessive loads and rotational speeds are prevented, but the regulation control cannot spontaneously adjust the blade angle towards 0° quickly enough when needed
Solution Approach 1:
The blade angle adjustment rate limit is changed from a static pre-settable value to a dynamic variable that automatically adjusts based on current operating conditions (rotor rotational speed, environmental parameters). This allows the limit to be higher when the rotor is slow and lower when the rotor is fast, resolving the contradiction between preventing excessive loads and enabling quick adjustment when needed.
Solution Approach 2:
The adjustment rate limit parameter is made variable by introducing dependency on rotor rotational speed and environmental parameters. The control device continuously monitors these parameters and adjusts the rate limit accordingly, allowing the system to adapt to changing conditions and resolve the contradiction between safety and responsiveness.
2Productivity
If the blade angle adjustment rate limit is increased to allow faster adjustment, then the regulation control can respond quicker to changes, but excessive loads and rotational speeds occur
Solution Approach 1:
The adjustment rate limit dynamically adapts to the current rotor rotational speed and environmental conditions. When the rotor is slow, the limit is higher allowing faster response. When the rotor is fast, the limit is lower preventing excessive loads. This dynamic adaptation resolves the contradiction between productivity and reliability.
Solution Approach 2:
The control device continuously monitors rotor rotational speed and environmental parameters, using this feedback to adjust the blade angle adjustment rate limit in real-time. This closed-loop control ensures the limit is optimized for current conditions, allowing fast response when safe and preventing excessive loads when dangerous.
3Device complexity
If a constant blade angle adjustment rate limit is used, then the control system is simple, but it cannot adapt to varying operating conditions and environmental parameters
Solution Approach 1:
The control system maintains relative simplicity while introducing adaptability by making the adjustment rate limit parameter variable based on easily measurable operating conditions (rotor speed, environmental parameters). The control device automatically adjusts the limit based on these parameters without requiring complex algorithms or additional hardware.
Data Source
AI summary
A method for the operation of a wind power plant (11) with a rotor (9), which has at least one rotor blade (10), wherein at least one part of the rotor blade (10) will be or is rotated around a longitudinal axis of the rotor blade (10) by a blade angle () wherein the rotation of the at least one part of the rotor blade (10) occurs with a pre-settable blade angle adjustment rate (θ), wherein the rotor (9) is operated speed variably and wherein the blade angle adjustment rate () is restricted by a pre-settable blade angle adjustment rate limit (G, G′, G1-G4). Furthermore, a wind power plant (11) with a rotor (9), which receives at least one rotor blade (10), wherein at least one part of the rotor blade (10) is rotatable around a longitudinal axis of the rotor blade (10) by a blade angle (), wherein a blade angle adjustment rate is pre-settable and the blade angle adjustment rate () is restricted by a blade angle adjustment rate limit (G, G′, G1-G4).