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.