A backup battery test method for pitch system

Abstract

The invention discloses a method for testing a backup battery of a pitch system, comprising the following steps: (1) after the pitch system feathers three blades of a fan to an emergency stop position, then opens a certain blade to a certain blade angle, and then close the motor brake on the shaft corresponding to the pitch system and the blade, and change the pitch system from the position control mode to the speed control mode; (2) After a certain period of time, the back-up of the shaft of the pitch system The battery voltage is judged, if it is greater than the value I, the backup battery is normal, and the status of the backup battery is alarmed between the value II and the value I; (3) Repeat steps (1)-(2) for the backup batteries of other axes of the pitch system carry out testing. The method disclosed in the present invention tests the backup battery by setting the pitch system to the speed mode, closing the motor brake, turning off the power to make the pitch system emergency feathering, and judging the backup battery voltage after a certain period of time. status, simple and effective.

Description

technical field [0001] The invention belongs to the field of wind power generators, and particularly relates to a backup battery testing method of a pitch system in the field. Background technique [0002] Electricity is an indispensable form of energy in daily production and life. Traditional thermal power generation not only consumes a lot of fossil resources, but also emits a lot of greenhouse gases; although nuclear power generation does not emit greenhouse gases, it is very dangerous. Once an accident occurs, it will cause irreversible damage to the environment. All are vigorously developing clean energy represented by wind power generation. The current mainstream wind turbine rotors are in the form of hubs and blades. In order to ensure the constant speed rotation of the wind rotor, it is necessary to adjust the windward angle of each blade of the fan in real time through the pitch system. [0003] The backup battery of the pitch system is very important to the safet...

AI Technical Summary

Problems solved by technology

[0003] The backup battery of the pitch system is crucial to the safety of the wind turbine. If the wind turbine is powered off, the pitch system needs to rely on the energy stored in the backup battery to feather the blades of the fan to the emergency stop position. At this time, if the capacity of the backup battery is insufficient or damaged , will cause the fan to overspeed or even collapse, seriously affecting the safety of the fan, but there is no mature, convenient and reliable method to effectively test the health status of the backup battery