Method for controlling the blade pitch angle of a wind turbine by using a hydraulic system

Applicants

Abstract

The present invention relates to a method of controlling a blade pitch angle of a wind turbine by using a hydraulic system. The hydraulic system includes a reservoir storing hydraulic fluid and a pump that supplies hydraulic fluid from the reservoir to the accumulator if the hydraulic fluid pressure in the reservoir is below a lower threshold and until the hydraulic fluid pressure in the reservoir exceeds an upper threshold. The accumulator stores pressurized hydraulic fluid supplied by the pump and supplies the pressurized hydraulic fluid to the pitch control cylinder via an output valve of the hydraulic system. Pressurized hydraulic fluid in the pitch control cylinder drives the piston to change the blade pitch angle. The method comprises the following steps: determining a target outflow of pressurized hydraulic fluid from the accumulator to the pitch control cylinder; determining a difference between the target outflow and a predetermined inflow of hydraulic fluid from the reservoir to the accumulator; if the target outflow is greater than the predetermined inflow, hydraulic fluid is supplied from the reservoir to the accumulator by the pump, regardless of whether the hydraulic fluid pressure is below a lower threshold.

Patent Family Records (6)

Method for controlling the blade pitch angle of a wind turbine by using a hydraulic system

Siemens Gamesa Renewable Energy A. Beryl, M.A. CHRISTENSEN

2024, CN-113294291-B

Method of controlling a blade pitch angle of a wind turbine by use of a hydraulic system  

Siemens (Denmark), Siemens Gamesa Renewable Energy AS BRILL ANTHONY, KRISTENSEN MIKKEL AGGERSBJERG

2023, US-11542918-B2

METHOD OF CONTROLLING A BLADE PITCH ANGLE OF A WIND TURBINE BY USE OF A HYDRAULIC SYSTEM  

Siemens (Denmark), Siemens Gamesa Renewable Energy AS BRILL ANTHONY, KRISTENSEN MIKKEL AGGERSBJERG

2022, EP-3869031-B1

METHOD OF CONTROLLING A BLADE PITCH ANGLE OF A WIND TURBINE BY USE OF A HYDRAULIC SYSTEM  

Siemens (Denmark), Siemens Gamesa Renewable Energy AS BRILL ANTHONY, KRISTENSEN MIKKEL AGGERSBJERG

2021, US-20210262436-A1

METHOD OF CONTROLLING A BLADE PITCH ANGLE OF A WIND TURBINE BY USE OF A HYDRAULIC SYSTEM  

Siemens (Denmark), Siemens Gamesa Renewable Energy AS BRILL ANTHONY, KRISTENSEN MIKKEL AGGERSBJERG

2021, EP-3869031-A1

Method for controlling the blade pitch angle of a wind turbine by using a hydraulic system  

Siemens (Denmark), Siemens Gamesa Renewable Energy AS BRILL ANTHONY, KRISTENSEN MORTEN AALBÆK

2021, CN-113294291-A

Data Provider: Digital Science