Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault

Taking a 1000 MW turbine generator as the research object, short-circuit fault in electrical disturbance is analyzed. Since it very difficult to carry out analysis experiments and on actual systems, simulation one of more effective means diagnosis; simulation’s results approach behavior system are ideal tools for power analysis, can provide an empirical basis practical applications. The model SIMULINK built analyze two types faults terminals grid short-circuit. impact load spectrum, current speed fluctuation between low-voltage rotors were extracted conclusion that value electromagnetic torque at terminal greater than side. two-phase largest, three-phase side smallest. transient impulse any point short-circuit; much difference caused by largest. alternating frequency force four kinds avoids natural torsional vibration shaft system, resonance time domain will not appear. However, after removed, residual small has potential rotor system. This shows structural integrity safe operation units fault, which only be applied engineering practice, but also theoretical subsequent research.