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Application and research of resistive superconducting fault current limiter in 60kV HVDC system

In recent years, flexible DC transmission technology has developed rapidly and matured in the industry, but it has brought about unavoidable problems: once a short circuit or other fault occurs in the high voltage DC transmission system, the rapid increase in fault current will cause irreversibility to the power grids damage. Aiming at the problems of rapid rise of fault short-circuit current and high peak current in the existing HVDC system, a resistive superconducting fault current limiter (RSFCL) model was built, which takes advantage of the quench characteristics of the second generation high temperature superconducting tape YBCO. This article introduces the working principle and working status of RSFCL in detail, uses PSCAD/EMTDC software to adopt new numerical modelling of RSFCL, applies it to 60kV high voltage direct current system, and verifies its correctness through a series of simulation experiments. The simulation results show that RSFCL will quench in a very short time and form a high resistance state. The larger the quench resistance value, the more obvious the current limiting effect. The final quench resistance value of 20Ω is the ideal choice for this article, but at the same time the quench process will cause the temperature of the superconducting strip to rise sharply, requiring additional auxiliary cooling equipment. The simulation results verify that the proposed RSFCL has an obvious role in limiting the rise rate and peak value of the fault short-circuit current.