Simulation Modeling of Subsynchronous Resonance of an Autonomous Power District with a Gas Turbine Unit

One of the sticking points of distributed generation facilities operation is considered—increased shaft vibration activity of the autonomous electric generator unit (AEU), which leads to the shutdown of the gas turbine unit (GTU) by antivibration protection. The main reasons for subsynchronous resonance in the AEU are analyzed. The AEU model based on a GTU, power transformer, and linear and nonlinear loads is presented. The results of simulation modeling of an AEU with a thyristor rectifier as a nonlinear load are obtained, and the influence of rigidity and response time of the power system mechanical component is studied.