Wind Turbine Output Control via Variable Rate Adaptation
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Solution Overview
Problem
Existing methods for controlling wind turbine output struggle to quickly reach the output upper limit while minimizing overshoot or undershoot, leading to reduced profitability due to fixed maximum output rates that do not adapt to the difference between the current output and the upper limit.
Innovation Solution
An output control apparatus for wind turbines that calculates a difference between the current output and the upper limit, sets a maximum output rate based on this difference, and adjusts the output command value to prevent overshooting or undershooting, using a lookup table to optimize the rate according to past overshoot or undershoot events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed maximum output rate is used to regulate the rate of change of wind turbine output, then overshoot and undershoot of the output upper limit can be suppressed, but the output cannot quickly reach the upper limit, reducing profitability
Solution Approach 1:
The patent applies dynamics by making the maximum output rate variable rather than fixed. The control device dynamically adjusts the maximum output rate based on the difference between current output and the upper limit, allowing the system to adapt its response characteristics in real-time to balance speed and stability.
Solution Approach 2:
The patent changes the parameter of maximum output rate from a constant value to a variable value that depends on the output difference. By setting different maximum output rates according to the magnitude of the difference between current and target output, the system optimizes both response speed and overshoot suppression.
2Productivity
If a high maximum output rate is used to quickly reach the output upper limit, then productivity and profitability improve, but overshoot and undershoot increase, reducing output stability
Solution Approach 1:
The system dynamically adjusts the maximum output rate based on real-time conditions. When the difference between current and target output is large, a higher maximum output rate is permitted to accelerate response. When the difference becomes small, the maximum output rate is reduced to prevent overshoot, thus maintaining stability.
Solution Approach 2:
The maximum output rate parameter is changed from a fixed value to a condition-dependent variable. The control device calculates the difference between current and target output and sets the maximum output rate accordingly, optimizing the trade-off between speed and stability for each operating condition.
3Reliability
If the output upper limit is set by external dispatch center due to insufficient adjusting power, then grid stability is maintained, but wind turbine profitability is reduced due to inability to quickly utilize available capacity
Solution Approach 1:
The patent enables dynamic response to the output upper limit by continuously adjusting the maximum output rate based on the difference between current and target output. This allows the wind turbine to quickly adapt to changes in the output upper limit while maintaining stability, maximizing profit within grid constraints.
Solution Approach 2:
The control device uses feedback from the difference between current and target output to adjust the maximum output rate. This closed-loop control ensures that the wind turbine responds efficiently to the output upper limit set by the dispatch center, minimizing lost profit opportunities while maintaining grid stability.
Data Source
AI summary
An output control apparatus for a wind turbine, including an output difference calculation unit; a maximum output rate setting unit; an output command value calculation unit; and an output control unit, wherein the maximum output rate setting unit is configured so that the larger an absolute value of the difference is, the higher the maximum output rate is set at least in a range that the absolute value of the difference is not greater a threshold value.