A speed monitoring method based on electrical signal extraction of synchronous generator

Abstract

The invention discloses a rotational speed monitoring method based on the generator terminal electric signal extraction of a synchronous generator. The rotational speed monitoring method comprises thefollowing steps: S1, collecting the port electric signal quantities of the synchronous generator, wherein the electric signal quantities comprise phase voltages ua, ub, uc and stator each-phase currents ia, ib, ic; S2, obtaining the port voltage phase information theta of the synchronous generator by using phase-locking control according to the electric signal quantities; S3, extracting three-phase current synchronous rotation signal quantities id, iq according to the port voltage phase information theta of the synchronous generator; and S4, obtaining the rotor rotational speed signal quantity of the synchronous generator according to the three-phase voltage and current synchronous rotation signal quantities. According to the rotational speed monitoring method, through accurate description of the electric signal quantities influencing the rotor rotational speed conversion of the synchronous generator, the precision of realizing the extraction of rotor rotational speed signal change signals of the synchronous generator through electric signal measurement is improved, and the problem that an existing rotor rotational speed signal extraction technology of the synchronous generator cannot quickly and accurately judge the torsional vibration of a shaft system of the synchronous generator is solved.

Description

technical field [0001] The invention belongs to the field of monitoring the rotational speed of a synchronous generator rotor, and more particularly relates to a rotational speed monitoring method based on the electrical signal extraction of a synchronous generator terminal. Background technique [0002] As one of the most important power supply equipment in the power system, the synchronous generator is expensive. The safe and stable operation of this equipment plays a vital role in the safety and stability of the power system. As an important part of the synchronous generator shaft system, the safety and stability of the shaft system is very important to the synchronous generator. With the gradual increase of the unit capacity of the steam turbine generator, the shaft system of the generator is more slender, and the characteristics of the shaft system reflect the Mechanical soft body properties. From the dynamic analysis of the shaft system, it can be known that the shaft...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the present invention provides a speed monitoring method based on the electrical signal extraction of the synchronous generator machine terminal. The signal measurement realizes the accuracy of the extraction of the synchronous generator rotor speed signal change signal, aiming to solve the technical problem that the existing synchronous generator rotor speed signal extraction technology cannot quickly and accurately judge the torsional vibration of the synchronous generator shaft system

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