Vibration Characteristics of a Hydroelectric Generating System with Different Hydraulic-Mechanical-Electric Parameters in a Sudden Load Increasing Process

In a sudden load increasing process (SLIP), the hydroelectric generating system (HGS) experiences severe vibration response due to change of hydraulic-mechanical-electric parameters (HMEPs). The instability HGS limits ability increase, and its flexibility reliability are reduced. Thus, in this study, new transient nonlinear coupling model is proposed, which couples hydro-turbine governing (HTGS) generator shafting (HGSS) with force, rotating speed, flow rate, torque, electromagnetic guide vane opening. By using numerical simulation, influences different HMEPs on characteristics SLIP analyzed. result shows that, compared stable operating conditions, amplitude increases sharply SLIP. increase amount, blade exit angle, mass eccentricity excitation current, decrease bearing stiffness average air gap between stator rotor cause abnormal degrees HGS. Hydraulic factors have greatest influence dynamic behavior maximum increased by 70.46%, that under conditions. This study provides reasonable reference for analysis multiple sources.