A power system redution method for the torsional torque analysis of turbine-generator shafts

This paper proposes a method to reduce a large power system to a simple system in order to analyze the torsional torque of a turbine-generator shaft. First, a large power system is divided into 2 areas such as the area of concern and the external area. Secondly, the external area is simplified to the equivalent Thevenin´s voltage sources. The reduced simple power system is modeled with EMTP-RV software to simulate the power system disturbances in accordance with the predetermined sequence of events. To verify the proposed reduction method, the outputs of EMTP-RV such as voltage profile, active power and reactive power at the generator output terminal in the reduced power system are compared with the results of PSS/E simulation in the original large power system.