A method and system for detecting a rotor of a wind power generator

Abstract

The invention discloses a method and system for detecting a wind driven generator rotor. The method comprises the steps that a proximity switch is used for detecting low-frequency pulse signals generated by tooth sockets formed in the wind driven generator rotor when the tooth sockets are detected by the switch; high-frequency pulse signals with the fixed period of t are generated, a counter used for counting the low-frequency pulse signals and the high-frequency pulse signals is initialized, the low-frequency pulse signals and the high-frequency pulse signals are counted through the counter, and whether the count value of the low-frequency pulse signals is equal to the number of the tooth sockets of the wind driven generator rotor or not is detected; if the count value of the low-frequency pulse signals is equal to the number of the tooth sockets of the wind driven generator rotor, the count value of the high-frequency pulse signals is recorded, the count value is cleared and the rotating speed of the wind driven generator rotor is calculated according to the recorded count value; and the system comprises a low-frequency pulse signal detecting unit, a pulse signal counting unit and a rotor rotating speed calculating unit. The method and system for detecting the wind driven generator rotor have the advantages that the implementation cost is low, the method is simple and reliable and influence of the installation precision of the tooth sockets and the proximity switch is avoided.

Description

technical field [0001] The invention relates to wind power generation technology, in particular to a wind power generator rotor detection method and system. Background technique [0002] At present, traditional megawatt-level wind turbines usually use an absolute speed encoder to measure the rotor speed of the wind turbine, and the output of the encoder is connected to the controller for data processing. However, the installation conditions of the encoder are relatively harsh. In order to install the encoder, the measurement position needs to be finely processed, and the cost of the encoder itself is relatively high. [0003] The Chinese patent document with the patent application number CN201410270651 discloses a speed sensorless speed measurement method, which organically integrates sliding mode control and model reference adaptive control, and selects the stator current measurement value of the doubly-fed wind turbine as a reference model. The stator current adjustable m...

AI Technical Summary

Problems solved by technology

However, this technical solution has the following disadvantages: (1) the speed calculation accuracy depends on the measurement accuracy of the radius of the circular trajectory where the bolt and nut are located, and the measurement accuracy of the arc length corresponding to the two proximity switches; processing method

For example: when a bolt and nut pass through the proximity switch, a pulse is sent out, but when it passes the proximity switch, no pulse is sent out, so the calculated speed will have a large deviation from the actual value; (3) no angle measurement is provided method

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