Wind turbine pitch-angle control device and method thereof

Abstract

A windmill pitch angle controller which reduces aerodynamic loading at the time of stoppage of a windmill. Upon input of a windmill stop instruction, the windmill pitch angle controller moves a pitch angle of each of windmill wings 5-1, 5-2 and 5-3 to a feathering position after matching the pitch angle of each of the windmill wings 5-1, 5-2 and 5-3.

Description

technical field [0001] The invention relates to a pitch angle control device and method of a windmill independently controlling the pitch angle of the windmill blades. Background technique [0002] Conventional wind turbine control stops the wind turbine when the wind speed becomes higher than the stop wind speed at which the operation is stopped, or when an abnormality such as acceleration or over-power occurs. When the wind turbine is stopped, the pitch angle of the wind turbine blades is moved from the operating state position to the feathered position (for example, refer to Patent Document 1). [0003] Patent Document 1: JP-A-2006-16984 [0004] In the case of employing an independent pitch control method in which the pitch angles of the respective wind turbine blades are individually controlled, the pitch angles of the respective wind turbine blades do not necessarily coincide when the wind turbine is stopped. Therefore, it is also considered to make each windmill bla...

AI Technical Summary

Problems solved by technology

When moving to the feathered position from different pitch angles in this way, there is a problem that the aerodynamic load becomes larger due to the unbalanced load of each windmill blade.

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