Wind Turbine Control for High-Turbulence Fatigue Load Limits
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Solution Overview
Problem
Existing wind power generator set control methods result in significant energy loss when turbulence intensity exceeds specified levels, particularly affecting large-scale wind power plants with complex terrains and prevailing wind directions, as they resort to shutdowns rather than adjusting operations to mitigate fatigue loads.
Innovation Solution
A control method and apparatus that acquire wind speed data, calculate turbulence intensity, and adjust the maximum rotating speed and torque of the wind wheel within a determined wind speed distribution range to meet preset fatigue load standards, thereby reducing the impact of excessive turbulence without shutting down the generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wind power generator set is shut down when turbulence intensity exceeds the specified level, then the fatigue load of the wind power generator set is reduced, but the loss of generated electric energy increases significantly
Solution Approach 1:
The patent applies dynamics by adjusting the maximum rotating speed and maximum torque of the wind wheel in real-time based on the measured turbulence intensity. Instead of a static shutdown decision, the system dynamically modifies operating parameters (rotating speed and torque) to adapt to varying turbulence conditions, thereby reducing fatigue loads while maintaining continuous operation and minimizing energy loss.
Solution Approach 2:
The patent implements parameter changes by modifying the maximum rotating speed and maximum torque parameters of the wind wheel according to the measured turbulence intensity. When turbulence exceeds the specified level, the system adjusts these parameters to reduce the thrust variation amplitude and fatigue loads, rather than shutting down, thus achieving both fatigue load reduction and energy loss minimization.
2Reliability
If the maximum rotating speed and torque are adjusted according to thrust variation amplitude, then the fatigue load meets preset standards, but the control system complexity increases
Solution Approach 1:
The patent applies feedback by continuously measuring the turbulence intensity, calculating the thrust variation amplitude based on the relationship among thrust, thrust coefficient, and wind speed, and then using this information to adjust the maximum rotating speed and maximum torque. This closed-loop feedback mechanism ensures fatigue load control while maintaining a relatively simple control structure that builds upon existing control parameters.
Data Source
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AI summary
A control method and a control apparatus of a wind power generator set are provided, in which a wind speed at a location of the wind power generator set is acquired, turbulence intensity is calculated according to the wind speed, and a wind speed distribution range corresponding to the turbulence intensity is determined; a thrust variation amplitude of the thrust in the wind speed distribution range is determined based on a relationship among the thrust suffered by a wind wheel of the wind power generator set, a thrust coefficient and the wind speed; and a maximum rotating speed and a maximum torque of the wind wheel in the wind speed distribution range are adjusted according to the thrust variation amplitude. The maximum rotating speed and the maximum torque makes a fatigue load of the wind power generator set in the wind speed distribution range meet a preset standard. According to the present disclosure, when the turbulence intensity is beyond a specified level, a fatigue load of a wind power generator set in the wind speed distribution range is made to meet a preset standard by adjusting a maximum rotating speed and a maximum torque, instead of shutting down the wind power generator set. Thereby influence on the wind power generator set is reduced when the turbulence intensity is beyond the specified level and a loss of generated electric energy is lowered.