| Presently,as our society and national economy develops at high speed, various trades and industries need more and more electric power,and gradually modern power system develops into a large-scale, high-voltage interlinkage system by way of one area striding over the others.However,such development trend directly leads to the serious problem that the short-circuit current becomes very large,and that conventional current limiting technologies show their limitations.Therefore the direction of exploring new short-circuit current limiting technologies then further developing new short-circuit current limiting equipments becomes a hot study in power system currently.This paper presents a short-circuit simulating study:Firstly,it studies carefully the characters of topology, movement, short-circuit current and its present solutions etc in the Zhejiang Power System with the voltage grade of 500kV;Secondly,it introduces the scientific-research fruit of the project "Solid-State Power Switchgear and Short Circuit Current Limiting Technology" supported by National Natural Science Foundation in our university,then expatiates the topology, work principle, excellences etc of this new SSFCL; Finally,by use of the Power System Simulation Programing Software NETOMAC, it carries out the short-circuit simulating study of in the Highvoltage-line at the exit of the Beilun plant of Zhejiang Power System with the voltage grade of 500kV.The final simulation results show:If a short-circuit fault happens in the position noticed above,the application of SSFCL makes the fault current greatly reduce to 12.05% of the value simulated in the contion of not using any step to limit fault current,and simultaneously it minishes the voltage-dips degree, therefore improves the transient powerquality of the system after the fault;Further more,it makes the transient swing amplitude of each generator rotor in the system remarkably therefore improves the transient stability of the system after the fault.
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