Economic Analysis of Saturated Core Fault Current Limiter

With the continuous improvement of China's power grid interconnection and the gradual promotion of ultrahigh voltage construction, the grid structure is increasingly strengthened, and the short-circuit current exceeding the standard is becoming more and more serious. How to economically and effectively limit the short-circuit current level is a key problem that urgently needs to be solved in power system planning and operation maintenance. The saturated core fault current limiter (SCFCL) is one of the most promising measures to limit the short-circuit current in the power grid. This article first introduces the typical topologies of four types of SCFCL: DC bias, permanent magnet bias, superconducting, and hybrid bias. The functional characteristics and technical advantages and disadvantages of these four types of SCFCL are compared and analyzed. Then, the economic evaluation model of SCFCL was introduced, which can be used to comprehensively calculate the cost of SCFCL. Finally, the current research status of FCL in economic analysis of systems was elaborated, and future research directions were discussed.