Analysis of Mechanical Characteristics and Operation Risk of Synchronous Condenser Rotor Under Dynamic Conditions With Typical Fault

ABSTRACT To address the safety concerns regarding the mechanical performance of the rotor, a coupled electromagnetic–structural–fatigue simulation model is established to investigate the impact of transient shock processes under rotor interturn short circuit (RISC) and static air‐gap eccentricity (SAGE) faults on the dynamic response and fatigue damage of the rotor shaft system during forced excitation operation of the synchronous condenser. First, the unbalanced magnetic pull (UMP) acting on the rotor is theoretically derived and its magnitude is obtained through electromagnetic simulation, followed by the calculation of the rotor's vibration response and corresponding experimental validation. Subsequently, a coupled electromagnetic–structural–fatigue simulation model is established to analyse the stress distribution of the rotor and verify its transient load‐bearing capacity. Finally, a fatigue simulation is conducted to evaluate the impact of forced excitation fault operation on the rotor's service life. The results show that the rotor can maintain stable vibration in normal operation, and the amplitude of rotor characteristic frequency vibration increases during fault. Forced excitation operation with faults has a significant effect on the fatigue damage of the rotor shaft system. As the degree of fault increases, the fatigue life of the rotor shaft system decreases sharply.