Method for testing health states of backup batteries of pitch system

Abstract

The invention discloses a method for testing health states of backup batteries of a pitch system. The method comprises the following steps of (1) after a fan blade of the pitch system is opened to a certain angle, disconnecting an external power supply of the pitch system and carrying out emergency feathering, and driving the pitch system to work by using backup batteries; (2) if the voltage of the backup battery for one shaft of the pitch system is low in the feathering process, restoring power supply of the external power supply and judging that the health state of the backup battery for theshaft is abnormal and the backup battery needs to be replaced; and (3) after feathering is completed, if the feathering speed of one shaft of the pitch system is smaller than a set value or the feathering time is greater than the set value, judging that the health state of the backup battery for the shaft is abnormal and the backup battery needs to be replaced, and if the feathering speed of oneshaft of the pitch system is greater than the set value or the feathering time is smaller than the set value, judging that the health state of the backup battery for the shaft is normal. According tothe method disclosed by the invention, the health state of each backup battery is judged through the feathering speed, the feathering time and the condition whether a contactor is closed or not, so that the method is simple and effective.

Description

technical field [0001] The invention belongs to the field of wind power generators, in particular to a method for testing the state of health of a backup battery of a pitch control 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 large amount of fossil resources, but also emits a large amount 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. Therefore, countries in recent years We have been vigorously developing clean energy represented by wind power generation. At present, the wind rotors of mainstream wind turbines are in the form of hubs and blades. In order to ensure the constant speed rotation of the wind rotors, it is necessary to adjust the windward angle of each blade of the fan through the pitch ...

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