Variable-Speed Wind Turbine Boost Power Under Torque Limits
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Solution Overview
Problem
Wind turbines are limited to rated power and speed to avoid damage and reduce service life, but increasing output above rated levels is desirable to enhance yield, especially at low temperatures, without risking damage or reducing operating time.
Innovation Solution
A method for controlling a wind turbine with adjustable rotor blades and a generator to operate above rated power by managing impact torque, power loss, and generator torque within predetermined limits, using variables like cooling capacity, ambient conditions, and load criteria to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wind turbine is operated at rated power and speed to avoid damage, then reliability is improved, but productivity decreases
Solution Approach 1:
The patent applies dynamics by transitioning from static rated power operation to dynamic variable power operation. The control system continuously adjusts the power output based on real-time monitoring of impact torque and power loss, allowing the turbine to operate above rated power when conditions permit while maintaining safety. This dynamic adaptation resolves the contradiction by making power output flexible rather than fixed.
Solution Approach 2:
The patent changes the operating parameters from fixed rated values to variable values that adapt to current conditions. By monitoring impact torque and power loss as key parameters, the system determines when to exceed rated power limits. This parameter-based control enables increased productivity while maintaining reliability through continuous parameter assessment.
2Productivity
If the wind turbine operates above rated power to increase yield, then productivity is improved, but reliability deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring impact torque and power loss during operation. When these parameters approach critical thresholds, the control system automatically reduces power output to prevent damage. This closed-loop feedback mechanism enables the turbine to safely operate above rated power by providing real-time information about the actual mechanical and thermal stresses experienced by the system.
Solution Approach 2:
The patent applies preliminary action by establishing predetermined safety thresholds for impact torque and power loss before operation begins. These pre-defined limits serve as protective boundaries that the control system uses to prevent excessive stresses. By preparing these safety criteria in advance, the system can quickly respond to changing conditions without compromising reliability.
3Loss of energy
If the wind turbine operates at higher power output, then loss of energy is reduced, but object-generated harmful factors increase
Solution Approach 1:
The patent uses feedback control to monitor power loss and impact torque in real-time. By continuously measuring these parameters, the system can determine the actual mechanical stresses and energy losses occurring during operation. This information enables the control system to optimize the balance between energy efficiency and mechanical stress, allowing higher power output only when power loss reduction justifies the increased stresses.
Solution Approach 2:
The patent changes the approach to energy loss and mechanical stress from fixed design values to variable operational parameters. By monitoring actual power loss and impact torque during operation, the system adapts its power output to minimize energy losses while keeping mechanical stresses within acceptable limits. This dynamic parameter adjustment resolves the contradiction by making both energy efficiency and stress levels controllable variables.
Data Source
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AI summary
The invention relates to a method for controlling a wind turbine (100; 602) with a variable-speed aerodynamic rotor (106) having rotor blades (108) with adjustable blade angle (αB), and with a generator (101) for generating generator power, wherein the wind turbine (100; 602) is characterized by a rated speed (nN), a rated power (PN) and a rated wind speed at which the rated speed (nN) and the rated power (PN) are achieved, and the method comprises: for a wind speed above the rated wind speed, operating the wind turbine (100; 602) with a power above the rated power (PN), wherein the power is increased by a boost power (P+) above the rated power (PN), the wind turbine (100;602) is operated in such a way that an impact moment (ms) remains below a predetermined limit moment, and an actual power loss (PV) does not exceed a predetermined power loss limit (PVL).;