Scanning frequency method for testing large turbine generator set torsional vibration mode

Abstract

The present invention relates to 300MW, 600MW, 1000MW steam turbine generator set shaft torsional vibration mode measurement and test method of large-scale thermal power plant, discloses a method of acting on generator excitation through excitation signal combined with dynamic continuous adjustment of excitation signal to obtain the best The closed-loop test of the optimal response realizes the detection method of the shafting torsional vibration mode of the online dynamic frequency sweeping unit. The dynamic online frequency sweeping method is used to output the modal characteristic excitation signal, which acts on the excitation system of the turbo-generator set and passes through the excitation system. The controllable electrical torque is generated in the turbogenerator set, and then the torsional vibration of the shafting of the unit is excited, and the torsional vibration intensity of the shafting is measured at the same time, so as to determine the natural mode of the shafting of the unit. This method can accurately measure the mechanical natural frequency of the shafting of the turbogenerator set, that is, the torsional vibration mode. Accurately testing the torsional vibration mode of the generator set is the basic research to solve the hazards of the subsynchronous oscillation of the unit, and is used to prevent, suppress and protect the generator set and Subsynchronous oscillation occurs in the power grid.

Description

technical field [0001] The invention relates to electric power systems, large-scale thermal power plants, and industrial fields requiring turbogenerator sets or large-capacity motors Background technique [0002] Large-scale thermal turbine technology is one of the key equipment of major equipment in my country, and the large-scale construction of power plants is the guarantee for the rapid development of my country's industry. The shafting of high-power units has the characteristics of light weight and flexibility, multiple supports, large span, and high power density. The utilization factor of generator materials is improved, and the power density of the shafting section is relatively increased. The natural frequency spectrum of the system is relatively dense, and the energy induced by vibration is low; at the same time, the power grid is also developing in the direction of a large ultra-high voltage area. The application of advanced power transmission and distribution an...

AI Technical Summary

Problems solved by technology

At present, the domestic method of testing this content is to do various disturbance tests after the large-scale generator is running, including unit synchronization, de-loading, line switching, unit load shedding, etc. It cannot guarantee that the test is sufficient and effective each time, and it is harmful to the unit. and power grid operation are somewhat destructive

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