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Over-speed prewarning protection method for generator of wind generating set

A technology for overspeed protection of wind turbines, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as the inability to realize overspeed warning and protection of generators, and achieve the effect of easy inspection

Inactive Publication Date: 2010-10-13
BEIJING TIANYUAN SCI & TECH CREATION WINDPOWER TECH
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a generator overspeed early warning and protection method for wind power generators aiming at the shortcomings of the existing technology that cannot realize the generator overspeed early warning protection

Method used

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  • Over-speed prewarning protection method for generator of wind generating set
  • Over-speed prewarning protection method for generator of wind generating set
  • Over-speed prewarning protection method for generator of wind generating set

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Embodiment Construction

[0023] The wind power generator overspeed warning and protection method provided by the present invention can realize the following functions: 1) detect the current rotation speed of the motor, and output the result according to the analog value (0-10VDC); 2) judge whether the current rotation speed of the motor exceeds the set value; Set the value, and output the result to the dry node signal.

[0024] refer to figure 1 , the present invention realizes the rotational speed detection by using two mutually independent proximity switch sensors to count the teeth of the same (60-tooth) chainring (and the speed of the chainring and the impeller is also synchronous), and the output of the sensor The duty cycle of the frequency signal is 50%, and the peak-to-peak value is 24VDC. One of the frequency signals is sent to the overspeed protection device, and the overspeed protection device judges whether the motor speed exceeds the set protection value. If the motor speed exceeds the s...

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Abstract

The invention discloses an over-speed prewarning protection method for a generator of a wind generating set. The over-speed prewarning protection for the generator is realized through a proximity switch, a fluted disk, an over-speed protection device, a bus and a blower control system, wherein the over-speed protection device consists of a rotating speed detection circuit, an over-speed judgment and protection circuit and a relay. The method comprises the following steps of: setting a rotating speed critical value at the over-speed judgment and protection circuit; acquiring a pulse signal of the generator through the proximity switch in contact with the fluted disk, and transmitting the pulse signal to the over-speed protection device; carrying out primary treatment on the pulse signal by the rotating speed detection circuit in the over-speed protection device, and converting a pulse frequency signal into a negative-going pulse signal with an adjustable duty ratio; and transmitting the negative-going pulse signal through two paths: wherein one path of the signal is transmitted to the over-speed judgment and protection circuit for treatment and then compared with the rotating speed critical value, and an over-speed judgment is made, the other path of the signal is directly transmitted to the control system through the bus, and the control system carries out the over-speed judgment.

Description

Technical field: [0001] The invention relates to a generator overspeed early warning protection method, in particular to a generator overspeed early warning protection method applied to a large grid-connected wind power generating set. Background technique: [0002] Domestic thermal power plants, hydropower plants, and steam turbine factories mainly use a speed sensor to detect the speed of the motor by installing an independent speed sensor for large generators. The independent speed sensor is indeed used on many large optional equipment, and the application range is relatively wide, but the price is relatively expensive, and it needs to be fixed on the equipment. In addition, there is a long distance between the sensor and the subsequent signal processing equipment. The signal line to connect. [0003] In the field of wind power generation, sensors are also used to detect the speed of wind turbine generators, but there are three disadvantages in using sensors for detectio...

Claims

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Application Information

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IPC IPC(8): H02H7/06
Inventor 朱超林王东亚韩东伟
Owner BEIJING TIANYUAN SCI & TECH CREATION WINDPOWER TECH
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