Wind Turbine Rotation Speed Exclusion for Tower Resonance Avoidance
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Solution Overview
Problem
Wind turbines with high-flexible towers face issues due to overlapping frequency components, leading to resonance and safety concerns when operating at low rotational speeds, which restricts power generation performance.
Innovation Solution
A method and apparatus for controlling rotational speed exclusion in wind turbines, which determines the power exclusion range based on the rotational speed exclusion range, allowing the wind turbine to operate within safe limits and avoid resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the minimum rotational speed of the generator rotor is limited to avoid resonance with the tower, then the safety and reliability of the wind turbine is improved, but the power generation performance deteriorates due to the narrow operating range between minimum and rated rotational speeds
Solution Approach 1:
The patent implements dynamic rotational speed exclusion control by continuously monitoring the actual rotational speed of the generator rotor and dynamically adjusting the exclusion range boundaries. The control method determines whether to exclude certain rotational speeds based on real-time operating conditions, wind speed, and grid requirements, rather than using fixed minimum rotational speed limits. This dynamic approach allows the wind turbine to safely operate across a broader rotational speed range while avoiding resonance conditions when they would be harmful.
2Reliability
If the rotational speed exclusion range is increased to avoid resonance, then the safety of the wind turbine is improved, but the power generation performance deteriorates because the operational range becomes too restricted
Solution Approach 1:
The patent changes the parameters of the rotational speed exclusion control by introducing variable exclusion range boundaries (first and second rotational speed exclusion boundaries) that are adjusted based on multiple factors including actual rotational speed, wind speed, and grid power requirements. The control method dynamically modifies these boundary parameters to minimize the exclusion range under safe operating conditions, thereby maximizing the available operational range for power generation while still preventing resonance when necessary.
Solution Approach 2:
The control system dynamically adjusts the rotational speed exclusion boundaries in real-time based on monitored operating conditions. When the wind turbine operates in conditions where resonance is not a concern, the exclusion range is minimized or eliminated entirely, allowing full power generation capability. When resonance risks are detected, the exclusion boundaries are dynamically adjusted to prevent operation in harmful speed ranges, thus maintaining safety without unnecessarily restricting power generation.
3Adaptability or versatility
If limited-power operation is implemented to meet grid requirements, then the adaptability to grid conditions is improved, but the risk of operating within the rotational speed exclusion range increases, leading to resonance and safety issues
Solution Approach 1:
The patent implements a feedback control mechanism that continuously monitors the actual rotational speed of the generator rotor and compares it against the dynamically determined rotational speed exclusion boundaries. When limited-power operation is commanded by the grid, the control system receives this instruction and adjusts the exclusion boundaries accordingly, while simultaneously monitoring whether the actual rotational speed approaches these boundaries. If the monitored rotational speed indicates a risk of entering the exclusion range, the control system takes corrective action to prevent resonance, thus maintaining safety while complying with grid requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents the rotational speed of wind turbines from overlapping with the exclusion range during limited-power operations, thereby avoiding abnormal resonance, overloaded loads, and ensuring safety and reliability.
Implementation Method 1
due to an inherent low frequency of the high-flexible tower itself, a frequency doubled component in an operating rotational speed of the wind turbine overlaps with the inherent frequency of the high-flexible tower
Data Source
AI summary
A rotation speed exclusion control method for a wind turbine generator system. The method comprises: when a power-limited operation instruction is received, determining a power value upper limit required by the instruction; determining that the required power value upper limit is in a power exclusion interval corresponding to a rotation speed exclusion interval; and when the required power value upper limit is in the power exclusion interval, setting the maximum allowable power value of a wind turbine generator system to be a lower boundary value of the power exclusion interval.