Active control and simulation test study on torsional vibration of large turbo-generator rotor shaft

Abstract In the paper, a new analysis method is presented for calculating the torsional wave in a multi-stepped shaft system according to the elastic wave theory, and it is used to simulate the torsional vibration of a turbo-generator shaft system (TSS). Based on the continuous mass model, an active control strategy for minimizing the total energy of torsional vibration in a TSS is deduced against the excitation due to short circuits in the generator or ground faults in the electric network. The responses of torsional vibration and their control process are simulated under the different operate condition. It is shown that active control can not only achieve good vibration attenuation and a fast response to the faults, but also adapt the change of exciting load and work effectively in all of the operating range of the machine.

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Sensitivity Analysis on the Dynamic Characteristics of a 1000 MW Turbo-Generator Rotor

Proceedings of the 9th IFToMM International Conference on Rotor Dynamics - Mechanisms and Machine Science ◽

10.1007/978-3-319-06590-8_152 ◽

2015 ◽

pp. 1841-1852 ◽

Cited By ~ 1

Author(s):

Van Thanh Ngo ◽

Danmei Xie ◽

Yi Yang ◽

Shang Gao ◽

Jie Guo

Keyword(s):

Sensitivity Analysis ◽

Dynamic Characteristics ◽

Generator Rotor ◽

Turbo Generator

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Experimental Study of Water Flow in Full-Size Test Rig for Water-Cooled Turbo-Generator Rotor

Proceedings of the Institution of Mechanical Engineers ◽

10.1243/pime_proc_1966_181_011_02 ◽

1966 ◽

Vol 181 (1) ◽

pp. 53-73 ◽

Cited By ~ 6

Author(s):

I. K. Csillag

Keyword(s):

Operating Conditions ◽

Experimental Investigations ◽

Air Cooling ◽

Test Rig ◽

Full Size ◽

Generator Rotor ◽

Turbo Generator ◽

Hydrogen Cooling ◽

Major Factors ◽

Design And Manufacture

The demand for electric power has doubled in the last decade. The most economical way to meet this demand is by building large-output generating units. The study of the major factors which determine the output of such generators shows that the only effective way to increase the output is by improving the cooling of their windings. For that reason design has progressed from air-cooling to indirect hydrogen-cooling, then to direct hydrogen-cooling. Now the trend is towards direct water-cooling where the water is in direct contact with the copper windings. The introduction of water into the stator winding was established in 1956 (1)† and was in fact directly responsible for the present increase in unit rating. The introduction of water to a rotating winding presents difficult problems in both design and manufacture. The test rig dealt with in this paper was built to study some of these problems and to carry out experimental investigations on a full size model of the special hydraulic features for a water-cooled turbo-generator rotor. The investigations were concentrated around the following five different problems which are dealt with in detail: (1) increase in pressure drop due to rotation; (2) free-rotating seal (inlet seal) (2); (3) vacuum-breaking device (water outlet) (3); (4) loss-distribution in the rotor; (5) measurement of the rotor vibrations in various operating conditions.

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