Stable control method for floating type wind generating set

Abstract

The invention discloses a stable control method for a floating type wind generating set. The stable control method for the floating type wind generating set comprises detecting a rotating speed signalof a generator under a rated wind speed, outputting a torque set value through a torque control loop, ensuring that the rotating speed of a wind wheel can be proportionally adjusted along with the wind speed, keeping the optimal blade tip speed ratio unchanged when the wind speed is changed, and realizing maximum wind energy capture. When the wind speed reaches the rated wind speed, the pitch angle of the set is changed through a variable pitch control loop, and the rotating speed of the generator is kept at the rated rotating speed. According to the stable control method for the floating type wind generating set, on the basis of the two control loops, a control loop related to a floating type foundation platform swaying signal is added, and is called as a floating type platform control loop, specifically, an acceleration signal or a speed signal of swaying operation of a floating type foundation platform is obtained through a sensor, control parameter setting is conducted through thefloating type platform control loop, a dynamic torque additional value is output and superposed to the output end of the torque control loop, so that the set load caused by related swaying motion ofthe floating type foundation platform is reduced, and the stability of the set is improved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for stabilizing a floating wind power generating set. Background technique [0002] With the continuous development of domestic offshore wind power technology and the further demand for wind energy resources in recent years, my country's wind power generators have gradually expanded from offshore wind power to deep sea areas. Deep-sea wind power technology requires a floating foundation platform as a support, but due to the comprehensive action of waves, currents and other marine environments, the floating foundation platform will produce corresponding swaying motions, and then coupled with the relevant structural characteristics of the wind turbine itself, it will be more It is prone to system instability such as negative damping. [0003] Similarly, compared with fixed offshore wind turbines, the components of floating wind turbines are subjected to grea...

AI Technical Summary

Problems solved by technology

However, in floating wind turbines, according to current research, the characteristic frequency exhibited by the floating foundation platform is lower, which greatly limits the bandwidth of the pitch loop controller. Sufficient dynamic speed regulation performance of the propeller mechanism is prone to overspeed and other unstable situations. From the perspective of control engineering, this is because the transfer function from the pitch angle to the generator speed forms a non-minimum phase system in the right half plane of the frequency domain. This causes a large lag in the phase of the unit, which affects the stability and rapidity of the unit system

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