Simulation model of radial vibration for a large hydro-turbine generator unit and its application

Simulating to predict the dynamic response of large hydro-turbine generator units (hydro-units) is of great significance. In this paper, a rotordynamic model of radial vibration is presented, which takes into account guide bearing, thrust bearing, unbalanced magnetic pull, hydraulic force and unbalanced force. The brief and practical database method is employed to model the guide bearing. Taking advantage of the method, operating conditions can be considered in the simulation model. A novel algorithm, which can take account of both transient and steady-state analysis, is proposed to solve the model. Dynamic response for 125 MW hydro-units in Gezhouba Power Station is simulated. Compared with the simulation results, monitoring data from Optimal Maintenance System for Hydro power plants (HOMS) are analyzed.