Study of Modified Flux-Coupling-Type SFCLs For Stability Improvement of a Multi-Machine Power System Based On Energy Function

Abstract

This paper investigates modified flux-coupling-type superconducting fault current limiters (SFCLs) for enhancing the transient stability of a multi-machine power system (MMPS). The clustering architecture of the MMPS with the modified SFCLs is presented, and the transient energy function (TEF) of the MMPS is established. Through clarifying the potential influence of the modified SFCLs, theoretical analysis signifies that the modified SFCLs can reduce the transient energy accumulation during the fault-feeding period, and increase the transient stability margin of the MMPS. Using MATLAB/Simulink, a benchmark IEEE 9-bus system with the SFCLs is modeled, and the simulation analysis of the generator rotor swing behaviors is carried out. Varying the resistive-inductive parameters and altering the positions of the SFCLs are considered, and the TEF method is applied to gain quantitative effects. The simulation findings in different scenarios testify the correctness of the theoretical analysis. The presence of the SFCLs can availably reduce the generator rotor oscillating and restrain the transient energy changing, and meanwhile, an extension of the critical clearance time is achieved for the MMPS.