Wind Turbine Pitch Control via Feedforward Speed Regulator
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Solution Overview
Problem
Existing wind turbines experience insufficient rapid power increase, leading to rotational speed and power overshoots and undershoots, resulting in increased mechanical loading during power limitation or startup.
Innovation Solution
A wind turbine system incorporating a speed regulator and generator regulator, with a feedforward controller that determines a control variable for pitch control based on rotational speed and power setpoints, reducing the need for action from the speed regulator and minimizing mechanical loading by controlling pitch angle adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional speed and power control is used in wind turbines, then the system operates reliably, but the power increase is insufficiently rapid and causes rotational speed overshoot and mechanical loading
Solution Approach 1:
The feedforward controller calculates the required pitch control variable in advance based on the power reference and current operating state, before the speed regulator responds. This preliminary action enables the pitch angle to be adjusted proactively to achieve the desired power increase rate without waiting for speed deviations to occur, thereby preventing mechanical loading and overshoot while maintaining rapid power response.
Solution Approach 2:
The control system combines feedforward control with feedback from the speed regulator. The feedforward controller provides proactive pitch adjustment based on power reference, while the speed regulator provides feedback based on actual speed deviations. This combination enables rapid power increase while the feedback mechanism prevents excessive overshoot and mechanical loading by correcting any deviations from the desired speed profile.
2Speed
If conventional pitch control is used, then the system responds to power deviations, but the response is too slow causing overshoots and undershoots
Solution Approach 1:
The feedforward controller computes the pitch control variable in advance based on the power reference and current operating conditions, before any speed deviation occurs. This preliminary action enables the pitch angle to be adjusted proactively to achieve the desired power increase rate without waiting for speed deviations to occur, thereby preventing mechanical loading and overshoot while maintaining rapid power response.
Solution Approach 2:
The control system combines feedforward control with feedback from the speed regulator. The feedforward controller provides proactive pitch adjustment based on power reference, while the speed regulator provides feedback based on actual speed deviations. This combination enables rapid power increase while the feedback mechanism prevents excessive overshoot and mechanical loading by correcting any deviations from the desired speed profile.
3Productivity
If feedforward control is implemented to enable rapid power increase, then productivity improves, but control system complexity increases
Solution Approach 1:
The feedforward controller computes the pitch control variable in advance based on the power reference and current operating conditions, before any speed deviation occurs. This preliminary action enables the pitch angle to be adjusted proactively to achieve the desired power increase rate without waiting for speed deviations to occur, thereby preventing mechanical loading and overshoot while maintaining rapid power response.
Data Source
AI summary
A wind turbine having a rotor, which has at least one rotor blade adjustable about its longitudinal axis via a pitch control, and a generator, driven by the rotor, having a speed regulator, which takes a control difference in the rotational speed and generates a control variable for the pitch control, and a generator regulator, which takes a power conductance and determines a rotational speed setpoint and a power setpoint, wherein a pilot control is provided that uses an inverse controlled system to determine a control variable for the pitch control, the inverse controlled system determining a power torque (MP) from the rotational speed setpoint and the power setpoint and also an acceleration torque (MB) from the change in the rotational speed setpoint over time and outputting the control variable for the pitch control as an output variable that provides pilot control for the output variable from the speed regulator.