Static electronic speed testing device and method for generator

Abstract

The invention discloses a static electronic speed testing device and method for a generator. The static electronic speed testing device comprises a phase voltage sampling module, an operational amplifier isolation module, three-phase voltage intersection point sampling module, a shaping and filtering module, a digital signal processor and a power module, wherein the phase voltage sampling module comprises three sampling circuits connected with three-phase voltage output ends of a secondary winding of the generator respectively; the operational amplifier isolation module comprises three operational amplifier circuits connected with output ends of the sampling circuits respectively; the three-phase voltage intersection point sampling module comprises six sampling circuits used for obtaining voltage signals of six intersection points, within a circle, of three-phase voltages; the shaping and filtering module is used for shaping and filtering analog levels where the intersection points are sampled; the digital signal processor is used for outputting rotating speed according to signals transmitted by the shaping and filtering module. The static electronic speed testing device does not need installing on the output shaft of the generator, and the rotating speed of the generator can be tested just through the three-phase output voltage signals. Influence of the environment on the static electronic speed testing device is small, and the static electronic speed testing device is easy to install and maintain and low in cost and fault rate.

Description

technical field [0001] The invention relates to a speed measuring device, especially a stationary electronic speed measuring device for a generator. Background technique [0002] In the power generation system, it is very important to detect the rotation speed of the generator, and many control methods are calculated on the basis of measuring the actual rotation speed of the generator. For example, the maximum power tracking control of our generator requires accurate generator speed to participate in the control. Existing generator speed measuring devices mostly use optical encoder sensors or Hall sensors to measure speed. Using the mechanical structure of rotary dynamic measurement, the installation is difficult, the failure rate is high, and the long-term service life will be greatly reduced, which will bring great harm to the maintenance of users. Big inconvenience. Taking the optical encoder sensor as an example, it is a sensor that converts the mechanical geometric di...

AI Technical Summary

Problems solved by technology

Existing generator speed measuring devices mostly use optical encoder sensors or Hall sensors to measure speed. Using the mechanical structure of rotary dynamic measurement, the installation is difficult, the failure rate is high, and the long-term service life will be greatly reduced, which will bring great harm to the maintenance of users. big inconvenience

Taking the optical encoder sensor as an example, it is a sensor that converts the mechanical geometric displacement on the output shaft of the permanent magnet generator into a pulse or digital quantity through photoelectric conversion. It is easily affected by the environment (light, dust) during the working process. The accuracy is low, and the measured speed is unstable, resulting in disturbance of power reference, or even loss of generator speed signal and shutdown

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