Wind turbine generator system alternating current variable pitch system backup power supply capacity detection method

Abstract

The invention discloses a wind turbine generator system alternating current variable pitch system backup power supply capacity detection method. The wind turbine generator system alternating current variable pitch system backup power supply capacity detection method comprises the steps that a capacity testing mode is turned on; a speed and a position of a current blade are changed by a master control command; an initial voltage value of a current backup power supply during testing is recorded; when the test is ended, the lowest working voltage value and the testing time value of the current backup power supply are recorded; the energy value provided by the backup power supply and an energy consumption value of a driving motor are calculated; the ratio between the energy consumption value of the driving motor and the energy value provided by the backup power supply is used as a testing result, and whether the current backup power supply capacity is abnormal is determined according to the testing result. The method provided by the invention is advantageous in that remote operation is realized, and when the backup power supply capacity is lower than a normal operation range of a device, a wind turbine generator system electric control system is used to determine whether a backup power supply module group is required to be replaced, and therefore the backup power supply is guaranteed to be provided with the enough capacity to satisfy a requirement of emergency feather; the measurement is simple, the testing period is short, and the testing is convenient.

Description

technical field [0001] The invention relates to the field of wind power, in particular to a method for detecting the backup power supply capacity of an AC variable pitch system of a wind generator set. Background technique [0002] The backup power supply of the AC pitch system is the only energy supply device in the pitch system after the power grid of the wind farm is powered off, and it is also a necessary condition to ensure the safe and reliable emergency pitch collection of the AC pitch system. The capacity of the backup power supply (super capacitor) is affected by the aging of the equipment itself, and is affected by the harsh external environment such as high and low temperature, humidity, salt spray, etc. After a certain period of work, the capacity of the backup power supply (super capacitor) cannot reach the initial design and fan safety. The necessary conditions for operation may cause emergency feathering failure of the AC pitch system, resulting in heavy prope...

AI Technical Summary

Problems solved by technology

At this stage, it is necessary to manually charge and discharge the supercapacitors in the three backup power cabinets of the pitch system by climbing the wind turbines one by one and manually using external equipment. The measurement is very troublesome, and the interval between each test is half a year to one year. No, the measurement interval is too long

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