Method for starting wind turbine generator

Abstract

The invention relates to a method for starting a wind turbine generator. The method comprises the first step of detecting environmental conditions and determining whether the wind turbine generator meets basic starting conditions; the second step of commanding a full-power frequency converter to be switched to a dragging operation mode and commanding the pitch angle of blades to be kept at a safety pitch angle [theta]s through a wind turbine generator control system; the third step of driving an impeller to rotate within a set safe rotation speed range through the frequency converter; the fourth step of calculating the rotational inertia J of the impeller; the fifth step of obtaining the rotational inertia variation limit value [delta]Jth of the impeller; the sixth step of judging whether a starting permission command is given; and the seventh step of switching the wind turbine generator back to a normal power generation mode and starting the wind turbine generator. According to the method, before the wind turbine generator is started, the frequency converter is used for driving the impeller to rotate at a low speed, and whether the impeller has abnormal conditions is judged, so that potential damage and detection condition limitations in detection in an operating state are avoided, and extra sensors do not need to be mounted.

Description

technical field [0001] The invention belongs to the field of wind power generation, in particular to a method for starting a wind turbine. Background technique [0002] The impeller of the wind turbine composed of blades and hubs is the main part of the wind turbine to absorb wind energy. Its state is directly related to the operation safety of the wind turbine. The impeller will have abnormal conditions such as icing, imbalance, and structural damage. The impeller of the wind turbine is covered with ice. It will change the aerodynamic shape, mass distribution and control characteristics of the blades, threatening the safe operation of the wind turbine. The detection and control of the abnormal state of the impeller is a key issue that must be considered in the operation of the wind turbine in the icing environment. The detection technology of the abnormal state of the impeller needs to be in operation. Judgment and response strategies can only be completed by accumulating o...

AI Technical Summary

Problems solved by technology

[0002] The impeller of the wind turbine composed of blades and hubs is the main part of the wind turbine to absorb wind energy. Its state is directly related to the operation safety of the wind turbine. The impeller will have abnormal conditions such as icing, imbalance, and structural damage. The impeller of the wind turbine is covered with ice. It will change the aerodynamic shape, mass distribution and control characteristics of the blades, threatening the safe operation of the wind turbine. The detection and control of the abnormal state of the impeller is a key issue that must be considered in the operation of the wind turbine in the icing environment. The detection technology of the abnormal state of the impeller needs to be in operation. Judgment and response strategies can only be completed by accumulating operating data in the process. At this time, the wind turbine has been working under abnormal blade conditions for a period of time, and corresponding hazards and fatigue damage have occurred. Unable to judge the current state during startup to ensure the safe operation of the wind turbine

[0003] The current method of abnormal state of the impeller also includes the method of installing sensors in the impeller to monitor the state of the impeller. This method requires the installation of additional measuring equipment, which is costly and requires accurate installation and calibration. With the accumulation of wind turbine running time, the sensor There are uncertain factors such as signal drift, and it is impossible to effectively judge the running state of the impeller

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