Abstract
A mechanical vibration inverse analysis has been performed on 150MW hydro-power machine in order to identify unbalanced magnetic pull. FEM model of the machine is developed according to design data. The System Equivalent Reduction Expansion Process is involved in model validation during the power-machine experimental run. The unbalanced magnetic pull in the generator is calculated from the verified model and monitored data.
Highlights
The hydropower machinery is exposed to vibration during operation as result of many excitation sources
The unbalanced magnetic pull (UMP) in power machinery are subject of the recent research
In [6] has been developed a general theory for the UMP and the analytical expression is provided for the UMP that consists of harmonic components
Summary
The hydropower machinery is exposed to vibration during operation as result of many excitation sources. The reliable simulation of the dynamical behavior is strongly dependent on the mathematical models of hydropower machine and corresponding excitation. In [8] the analytical expression of the UMP in a three-phase electrical machine with any numbers of pole-pairs has been derived. In [9] and [10] an analytical model of hydro power units have developed in order to determine the UMP and obtained results have been compared with FEM simulation. The influence of the UMP on the rotor using linear and nonlinear model of the generator has been researched in [10] where an improved reduction technique was used to reduce the degrees of freedom of FE model to make a comparison with measurement. It is proved that the FEM model reliably simulates the dynamic interaction between turbine and generator for the considered operational state
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