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.

中文翻译：

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基于能量函数的改进磁通耦合型SFCL提高多机电力系统稳定性的研究


本文研究了改进的磁通耦合型超导故障电流限制器（SFCL），以增强多机电力系统（MMPS）的暂态稳定性。提出了具有改进的 SFCL 的 MMPS 的聚类架构，并建立了 MMPS 的瞬态能量函数（TEF）。通过阐明改进的SFCL的潜在影响，理论分析表明改进的SFCL可以减少故障馈电期间的暂态能量积累，并增加MMPS的暂态稳定裕度。使用 MATLAB/Simulink 对带有 SFCL 的基准 IEEE 9 总线系统进行建模，并对发电机转子摆动行为进行仿真分析。考虑改变阻感参数和改变SFCL的位置，并应用TEF方法来获得定量效果。不同场景下的仿真结果证明了理论分析的正确性。 SFCL的存在可以有效减少发电机转子振荡并抑制瞬态能量变化，同时延长MMPS的临界间隙时间。