Wind Turbine Power-Limited Control via Speed and Torque Adjustment
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Solution Overview
Problem
Wind energy installations face challenges in power-limited operation, including unnecessary noise, poor control of wind turbines, and unfavorable torque and speed relationships, leading to excessive loading and inefficient operation.
Innovation Solution
A method for wind energy installations that incorporates rotor blade control, torque control, and a control unit to set and manage a target power value, determining a speed limit and adjusting torque to maintain optimal operation within power-limited conditions, using a characteristic curve to ensure efficient power generation and stable control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the wind turbine operates at rotational speeds corresponding to standard operation in power-limited mode, then the power generation capacity is maintained, but unnecessary noise is generated
Solution Approach 1:
The patent applies parameter changes by adjusting the rotational speed parameter from standard operation values to reduced values appropriate for power-limited mode. The control unit determines a reduced rotational speed setpoint that is lower than the standard operational speed, thereby reducing noise generation while maintaining appropriate power generation capacity for the limited operating conditions.
2Power
If the wind turbine uses torque control and rotor blade control in reduced-power mode, then power output is reduced, but the turbine assumes operating states that lead to unnecessary stress and are difficult to control
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual torque and rotational speed, comparing them with the setpoint values determined by the control unit. The control system adjusts the torque control and rotor blade control based on this feedback to maintain stable operating states, preventing excessive stress and ensuring controllable operation in power-limited mode.
Solution Approach 2:
The patent applies dynamics by making the torque and rotational speed setpoints variable rather than fixed. The control unit dynamically determines appropriate setpoint values based on the power-limited operating conditions, allowing the turbine to adapt its operating parameters in real-time to maintain stability and avoid unfavorable torque-speed combinations that cause stress and control difficulties.
3Power
If the wind turbine operates with high rotational speeds in power-limited mode, then power generation potential is maintained, but the torque and speed relationship becomes unfavorable for turbine operation
Solution Approach 1:
The patent changes the rotational speed parameter from high values to reduced values that are appropriate for power-limited operation. The control unit calculates and applies a reduced rotational speed setpoint that creates a favorable torque-speed relationship, making the turbine easier to operate and control while still maintaining appropriate power generation potential for the limited conditions.
Data Source
AI summary
Method for operating a wind turbine with a rotor blade control, a torque control and a control unit which, in a power-limited operating mode, specifies a setpoint for the input power that is less than the rated power, and which, from a limiting speed, reduces the torque by means of the torque control in such a way that the specified setpoint for power is not exceeded, wherein the limiting speed is determined to a value that is less than the rated speed, depending on the specified setpoint for torque.