Vestas Wind Systems has filed a patent for a method of operating a wind turbine that actively promotes blade vibrations by applying a pitch actuation signal to the pitch actuator. The method also involves determining at least one parameter related to the blade vibration. GlobalData’s report on Vestas Wind Systems gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData s company profile on Vestas Wind Systems, aerial inspection drones was a key innovation area identified from patents. Vestas Wind Systems's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.

Blade monitoring and vibration promotion in wind turbines

Source: United States Patent and Trademark Office (USPTO). Credit: Vestas Wind Systems AS

A recently filed patent (Publication Number: US20230204010A1) describes a method of operating a wind turbine with pitch adjustable rotor blades. The method involves applying a pitch actuation signal to the blades, which is conditioned to promote blade vibration. Additionally, the method includes determining at least one parameter relating to the blade vibration.

The patent claims that while the pitch actuation signal is being applied, a selected monitoring parameter is monitored. If this monitoring parameter reaches a threshold, the active promotion of blade vibration is stopped. This allows for the control and regulation of the blade vibration to ensure it remains within acceptable limits.

The determination of the parameters relating to blade vibration can be based on a sensor signal. This allows for accurate measurement and analysis of the blade vibration, providing valuable data for monitoring and maintenance purposes.

The pitch actuation signal used in the method can be a time varied signal, allowing for flexibility and control in promoting blade vibration. The patent also mentions that the method can be applied when the wind turbine rotor is at standstill or rotating at a controlled speed. In the latter case, the application of the pitch actuation signal is correlated with the blade position in the rotor plane, ensuring it is conducted within a predefined angular range.

The patent also describes a control system for a wind turbine that includes a pitch actuation unit and a control module. The pitch actuation unit actively promotes blade vibrations in response to a pitch actuation signal, while the control module determines the parameters relating to blade vibration. The control module is configured to stop the active promotion of blade vibration when the parameters reach a threshold.

Overall, this patent presents a method and control system for operating wind turbines with pitch adjustable rotor blades, allowing for the active promotion and monitoring of blade vibration. This technology has the potential to improve the performance and maintenance of wind turbines, ensuring optimal operation and reducing the risk of damage or failure.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies