Wind Turbine Blade Positioning for Low-Load Shutdown Maintenance
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Solution Overview
Problem
During maintenance of wind turbine generator plants, the residual load poses a safety risk to maintenance personnel due to uncontrolled wind conditions, necessitating a method to safely reduce the load and ensure personal safety.
Innovation Solution
A method and apparatus that determines the type of failure and corresponding maintenance wind speed, adjusting a blade to a predetermined azimuth angle (e.g., multiples of 30°) to lock the impeller, thereby reducing the load and ensuring safe maintenance conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wind turbine generator plant is shut down for maintenance, then maintenance personnel can enter the plant for repairs, but residual load remains on the plant creating safety risks
Solution Approach 1:
The patent changes the operational parameters of the wind turbine by adjusting blade pitch angles and impeller rotation speed to specific values that minimize residual load during maintenance. The control system modifies these parameters to create a safe maintenance state while keeping the plant accessible for personnel entry.
Solution Approach 2:
Before maintenance personnel enter the plant, the control system performs preliminary actions by actively reducing the residual load through blade and impeller adjustments. This preliminary load reduction ensures safety conditions are established before human entry, eliminating the hazard while maintaining maintenance accessibility.
2Reliability
If the impeller is locked at high wind speeds, then maintenance can be performed without load, but the maintenance window is limited by wind speed conditions
Solution Approach 1:
The patent implements a dynamic maintenance scheduling system that monitors real-time wind speed conditions and automatically determines when the impeller can be safely locked. The system adapts maintenance operations to varying wind conditions, locking the impeller when wind speeds are favorable and scheduling maintenance activities accordingly, thus balancing safety requirements with operational availability.
Data Source
AI summary
This application discloses a method, device, and apparatus for maintaining a wind turbine generator plant, which relates to the field of wind power generation. The method includes determining a failure of the wind turbine generator plant when the wind turbine generator plant enters a shutdown maintenance mode; determining a maintenance wind speed corresponding to the failure; adjusting one of blades of the wind turbine generator plant to reach a predetermined azimuth angle and lock an impeller of the wind turbine generator plant to maintain the wind turbine generator plant in a case where the failure belongs to a first type of failure and a real-time wind speed obtained is less than or equal to the maintenance wind speed corresponding to the failure, the first type of failure comprising a failure that requires to lock the impeller for maintenance and the predetermined azimuth angle being a different integral multiple of 30°.