A stability control method for floating wind turbines

Abstract

The invention discloses a method for stabilizing a floating wind power generating set. Below the rated wind speed, the generator speed signal is detected, and the torque setting value is output through a torque control loop to ensure that the wind rotor speed can be adjusted in proportion to the wind speed. When the wind speed changes, the optimal blade tip speed ratio remains unchanged to achieve maximum wind energy capture; when the wind speed reaches the rated wind speed, the pitch angle of the unit is changed through the pitch control loop to keep the generator speed at the rated speed. The present invention adds a control loop about the sway signal of the floating foundation platform on the basis of the above two control loops, which is called the floating platform control loop, and specifically obtains the acceleration signal of the sway operation of the floating foundation platform or The speed signal, through the floating platform control loop for control parameter setting, outputs a dynamic torque added value, which is superimposed on the output end of the torque control loop to reduce the load of the unit caused by the swaying motion of the floating foundation platform and improve the Crew stability.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a stability control method for 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 generating units have gradually expanded from offshore wind power to deep sea areas. Deep-sea wind power technology needs to use floating foundation platform as support, but due to the comprehensive action of ocean environment such as waves and ocean currents, floating foundation platform will produce corresponding swaying motion, 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 turbines are subject to...

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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