Synchronous torsional vibration excitation method simultaneously excitating multi-turbine generator set torsional vibration

A technology for torsional vibration of turbogenerator sets and shafting, which is applied in the field of power systems and large-scale thermal power plants, and can solve problems such as torsional rigidity drop, torsional vibration of generator sets, and fracture of shafting systems

CN101308182AActive Publication Date: 2008-11-19BEIJING SIFANG JIBAO AUTOMATION +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-11-19

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Abstract

The invention relates to an experimental method for simultaneously exciting out unit shafting torsional oscillation of a plurality of turbo-generator units in a large thermal power plant, which discloses an excitation method for realizing the synchronous torsional oscillation of a plurality of generating sets based on a synchronous torsional oscillation excitation device through GPS time tick, the synchronous torsional oscillation excitation device sends out synchronous torsional oscillation excitation signals having the same frequency with the unit mode to each generating set, the signals act on excitation systems of turbo-generator units and generate controllable electric torque in the turbo-generator units through the excitation systems, the shafting torsional oscillation on the plurality of units can be further excited out simultaneously, meanwhile, the strength of shafting torsional oscillation of each generating set can be detected for confirming the safety of the unit shafting. The method can accurately and controllably generate shafting torsional oscillation synchronously on the plurality of large turbo-generator units, and provides a test means for researching the effectiveness and setting of various measures for restricting sub-synchronous oscillation (SSO) and sub-synchronous resonance (SSR).
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Description

technical field

[0001] The invention relates to electric power systems, large thermal power plants, industrial fields requiring steam turbine generator sets, and electric power fields related to subsynchronous oscillation or subsynchronous resonance of electric power systems. Background technique

[0002] Large-scale thermal turbine unit technology is one of the key equipment of major equipment in my country. The shafting of high-power units has the characteristics of light weight, flexibility, multi-support, large span and high power density. The utilization factor of generator materials is improved, and the shafting section power The density increases relatively, the lengthening of the shafting reduces the torsional stiffness, the natural frequency spectrum of the shafting is relatively dense, and the energy of induced vibration is low; at the same time, the ultra-high voltage long-distance transmission of the power system uses a large number of series compensation capacitor...

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Embodiment Construction

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] The synchronous torsional vibration excitation device (CSC-811PT) can measure the torsional vibration modal signal of the shaft system of the generator set in real time to monitor the intensity of the torsional vibration excitation; it can output one or more (up to 5) torsional vibrations of a specified frequency in real time The vibration excitation signal acts on the excitation system to generate the electromagnetic torque of the generator shaft system, thereby exciting the generator set shaft system torsional vibration; it can receive the time synchronization signal of the GPS clock, and achieve the synchronous output of the excitation signal through the internal phase locking and frequency division. The time accuracy is less than 0.1ms; it can record the output excitation signal AO, the measured shafting speed difference signal dw,...