Torsional vibration error monitoring method for shaft system of steam turbine generator unit, monitor and system

Abstract

The invention discloses a torsional vibration error monitoring method for a shaft system of a steam turbine generator unit, a monitor and a system. The method includes the steps of S1, collecting output signals of rotation speed sensors, key phase sensors and bearing base vibration acceleration sensors on the steam turbine generator unit; S2, conducting Fourier transform on the collected output signal of each bearing base vibration acceleration sensor to obtain vibration spectrum signals; S3, extracting an amplitude value in the vibration spectrum signal of each bearing base vibration acceleration sensor under the corresponding rotation frequency; S4, obtaining the types of to-be-detected frequencies and separately extracting the corresponding amplitude value and phase under each type of to-be-detected frequency from the vibration spectrum signal of each bearing base vibration acceleration sensor to serve as feature parameters; S5, on the basis of a judgment principle and the extractedfeature parameters, judging whether or not torsional vibration errors of the shaft system occur in the steam turbine generator unit. By means of the method, real-time online monitoring of the torsional vibration errors of the shaft system is achieved.

Description

technical field [0001] The invention belongs to the technical field of generators, and in particular relates to a method, a monitor and a system for monitoring torsional vibration faults of a shaft system of a steam turbine generator set. Background technique [0002] As my country's demand for electricity increases day by day, my country's power system has entered the era of super (ultra) high voltage, long-distance, and large units. Supercritical, ultra-supercritical 600MW and 1000MW turbogenerators have become the main units of today's power grid. The shafting of the turbogenerator is more slender, and the bending stiffness and torsional stiffness of the shafting are also significantly reduced. The torsional vibration of the shafting is inherently Reduced frequency. In order to improve the power transmission capacity of the power system, a series of new technologies including series compensation have been adopted on the grid side. The development and application of the a...

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Problems solved by technology

However, this method is not sensitive enough to extract the early torsional vibration fault characteristics of the shaft system, and the anti-noise ability is not strong enough

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