Resistor type superconducting fault current limiter: Optimum shunt resistance determination to enhance power system transient stability

Abstract

In power systems, Resistor type Superconducting Fault Current Limiters (RSFCL) can limit the prospective short-circuit currents to lower levels, so that the underrated switchgears can operate safely. Besides, RSFCLs can enhance the power system transient stability if they are accompanied by appropriate shunt resistances. This paper presents a method of optimum shunt resistance determination for transient stability improvement. The method is based on minimization of rotor kinetic energy oscillations. Meanwhile to make it more comprehensible, the method is utilized to determine the shunt resistances of three RSFCLs installed in a 9-bus 3-generator sample network. All of the simulations have been carried out by EMTP/ATP. The paper begins by modeling an RSFCL. Then RSFCL critical current determination is discussed in a model system. Finally, a method of optimum shunt resistance determination for transient stability improvement is presented. © 2009 The Institute of Electrical Engineers of Japan.