Control method, central controller and system of wind turbine

Abstract

The invention provides a control method, central controller and system of a wind turbine. The control method of the wind turbine comprises the following steps: measuring the measured value containing the position signal Pact, of each blade of the wind turbine; according to the position measured value of each blade, outputting the preset values containing the position preset signal Pset, wherein the preset values are used to control the blades; according to the measured value of each blade, outputting the delay speed of two adjacent blades; and according to the measured values and delay speed of the blades, correcting the preset values and outputting the corrected values containing the position corrected value P'set, wherein the corrected values are used to control the blades of the wind turbine. The controller of the invention contains a control unit, an asymmetric prediction unit and an asymmetric adjustment unit, wherein the control unit can output the preset values according to the measured values of the blades; the asymmetric prediction unit can output the delay speed of two adjacent blades according to the measured values; and the asymmetric adjustment unit can correct the preset values. The central controller of the invention is connected with the pitch controller of the wind turbine, thus the asymmetric fault of the wind turbine can be effectively prevented, the cost is low and the effect is good.

Description

technical field [0001] The present invention relates to a control method of a wind turbine, a central controller and a wind turbine system using the central controller, in particular to a control method and a central controller capable of preventing asymmetric faults of wind turbine blades in a variable-speed constant-frequency wind turbine and its system. Background technique [0002] Variable-speed constant-frequency wind turbines can be used in wind power generators. When the wind speed changes, the wind turbines can rotate adaptively to capture wind energy and drive the generator to produce electricity. A wind turbine has at least one blade, and in most cases three blades. Each blade is controlled by an electric pitch system. figure 1 Shown is a variable speed wind turbine with three blades 1, 2 and 3, operating at an angular velocity W r turn. The electric pitch system is the most important subsystem in this type of wind turbine, which controls the angle of the roto...

AI Technical Summary

Problems solved by technology

But these methods only protect against asymmetric failure for a limited period of time, and parts are expensive to replace and install

Images