A blade pitch angle compensation control method and a wind turbine anti-overspeed control method

Abstract

The invention discloses a blade pitch angle compensation control method which comprises the steps of according to a certain time period, monitoring the generator speed of a wind generation set in thecontinuous time period in real time; calculating the generator speed error and the speed error change rate of the n period corresponding to the n-1 period; and comparing the speed error and the speederror change rate of the n period with preset reference values of a main control system of the wind generation set, wherein if the speed error and the speed error change rate of the n period exceed the preset reference values of the main control system of the wind generation set, the main control system of the wind generation set sets a rated pitch-regulated angle for a pitch system of the wind generation set, and the compensation control on a blade pitch angle is realized. The invention further discloses an anti-overspeed control method of the wind generation set comprising the blade pitch angle compensation control method. The aim of controlling the actin of the pitch angle in advance if necessary can be achieved, the wind generation set is ensured to run stably, the shutdown caused by the overspeed of the wind generation set is effectively avoided, the limit load during shutdown caused by the overspeed is effectively reduced, and the damage rate of the wind generation set is reduced.

Description

Technical field [0001] The invention relates to the technical field of wind power generation, in particular to a blade pitch angle compensation control method and a wind turbine anti-overspeed control method. Background technique [0002] The main control system of the wind turbine generator can include torque control and pitch angle control. When the wind turbine is running above the rated wind speed, it is mainly through controlling the pitch angle to keep the generator speed stable, so as to ensure the stable operation of the wind turbine and stable output power. However, under certain complex terrain, due to the influence of surface roughness, the turbulence is large and the wind speed changes drastically. In extreme cases, the wind speed change can reach 1s and 4m / s. In such wind conditions, considering the large inertia of the pitch angle execution system, the pitch angle following has a large lag, which causes the generator speed to exceed the safety protection value of t...

AI Technical Summary

Problems solved by technology

Under such wind conditions, considering the large inertia of the pitch angle actuator system, there is a large hysteresis in the pitch angle following, which causes the generator speed to exceed the safety protection value of the control system, and the wind turbine triggers an overspeed shutdown

Under the above circumstances, the occurrence of damage loads has increased significantly, and the existing pitch angle control methods cannot well meet the requirements of load reduction and smooth shutdown control, so it is necessary to optimize the pitch angle control methods

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