Wind Turbine Control for Complex Wind Load Protection
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Solution Overview
Problem
Existing wind turbines struggle to accurately identify and respond to complex wind conditions, such as rapid changes in rotational speed and pitch angle, which can lead to fatigue loads and ultimate loads, especially in challenging terrain and climatic conditions, increasing the risk of extreme events like blade sweeping the tower.
Innovation Solution
A control system and method that utilizes wind resource data and operation data from sensors like wind vanes, anemometers, rotational speed sensors, and pitch angle sensors to identify complex wind conditions, including gusts, extreme wind direction changes, abnormal speed and rotational speed increments, and pitch angle increments, and triggers protective measures when these conditions exceed predefined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the converter 30 is configured to convert power from the power grid to a frequency matching the rotational speed of the wind turbine rotor, then the wind turbine can operate at variable speeds to maximize energy capture, but the converter adds device complexity and potential failure points
Solution Approach 1:
The control system continuously monitors the rotational speed of the wind turbine rotor and adjusts the converter's output frequency accordingly. This feedback mechanism ensures that the converter adapts to varying wind conditions, maintaining optimal operating speed for maximum energy capture while managing the complexity through intelligent control rather than mechanical complexity
Solution Approach 2:
The converter dynamically changes its operating parameters (frequency and voltage) based on the rotor's rotational speed. By adjusting these electrical parameters in real-time, the system maintains synchronization between the grid power frequency and the turbine's mechanical speed, enabling variable speed operation without requiring complex mechanical transmission systems
2Productivity
If the converter 30 converts power frequency to match rotor speed, then the wind turbine can feed power back to the grid effectively, but increased converter complexity raises the risk of converter failure
Solution Approach 1:
The control system is designed to detect converter malfunctions or abnormal conditions and switch to alternative operating modes before complete failure occurs. This preparatory protective measure ensures that the system can maintain basic functionality or shut down safely, preventing total system failure and protecting the investment in the wind turbine infrastructure
Solution Approach 2:
The control system continuously monitors the converter's operational status and automatically adjusts its control strategies to compensate for detected issues. This self-diagnosis and self-adjustment capability reduces the need for external intervention and maintains system reliability by allowing the converter to service itself within operational limits
3Reliability
If the control system monitors converter status and controls power conversion accordingly, then system reliability is improved through fault detection, but the control system complexity increases
Solution Approach 1:
The control system performs multiple functions using a single integrated unit: it monitors converter status, adjusts power conversion parameters, detects faults, and controls the overall wind turbine operation. This multi-functional approach consolidates what could be separate complex systems into one coordinated controller, improving reliability through comprehensive monitoring while managing complexity through functional integration rather than proliferation of separate components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces fatigue accumulation and prevents extreme events by implementing protective strategies like power limitation or shutdown, enhancing the safety and adaptability of wind turbines in complex wind conditions.
Implementation Method 1
a power converter configured to convert power from the power grid to power having a frequency corresponding to a rotational speed of the wind turbine rotor
Data Source
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AI summary
A wind turbine generator system, and a control method, controller and control system therefor. The control method for a wind turbine generator system comprises: monitoring wind resource data of the location of a wind turbine generator system, and operation data of the wind turbine generator system; identifying a complex wind condition according to the wind resource data and the operation data; determining the cumulative time ratio of the complex wind condition occurring within a first predetermined time period; and in response to the cumulative time ratio exceeding a first preset threshold value, controlling the wind turbine generator system to perform a protection operation. The present invention can effectively reduce fatigue accumulation of a wind turbine generator system, reduce the operation risk thereof, ensure the safe working of the wind turbine generator system under a complex wind condition, and improve the adaptability of the wind turbine generator system to complex wind conditions.