Development of a Reclosing Scheme for Reduction of Turbine Generator Shaft Torsional Torques: A Decision Method to Achieve Optimal Reactor Capacity

Abstract

-It is well known that line switching operations like reclosing are able to cause transient power oscillations which can stress or damage turbine generators. This paper presents a reclosing scheme to reduce the shaft torsional torques of turbine generators by inserting an additional reactor. A novel method to determine optimal reactor capacity to minimize the torsional torque generated in a turbine generator is also proposed. In this paper, the turbine generator shaft is represented by a multimass model to measure torsional torques generated in the shaft between the turbine and the generator. Transmission systems based on actual data from Korea are modeled to verify the proposed scheme using ElectroMagnetic Transient Program (EMTP) software. The simulation results clearly show the effectiveness of the proposed scheme and torsional torque can be minimized by applying the proposed scheme.

Algorithm for Fault Detection and Classification Using Wavelet Singular Value Decomposition for Wide-Area Protection

“…The target network is all the transmission lines of 345 kV and 765kV in 2008 [19][20][21][22]. The transmission lines of 154 kV are treated as a load.…”

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

“…Unlike the step-1, the step-2 focuses on the impact when a reclosing operation occurs. It has been researched that the impact on the turbine generator can be evaluated by a sudden power change, ΔP, generated by a switching operation [19][20][21][22][23]. An IEEE Committee recommends that a ΔP value equal to 0.5 per unit be considered an acceptable screening level for evaluating steady-state switching if a turbine generator is operating under the allowable load condition [14][15].…”