Parameter Design and Optimization Methodology for Large Capacity Applications of Permanent-magnet-biased Saturation Based Fault Current Limiter

A straight-line type topology was employed for permanent-magnet-biased saturation based fault current limiter(PMFCL) to meet large capacity application requirements.By virtue of three basic variables of saturation depth ratio,inductance ratio and inductance sum,an algorithm for structural parameters design was established on the basis of equivalent magnetic circuit method.Through analysis of the iron-core's operational points,the optimization of the structural parameters was equivalently transformed to optimization of the three independent variables,which can also be considered as the optimization of three key points on the i-Be curve of iron-core.A solid foundation for optimal structural parameters was laid in view of all of the above work.The parameter optimization algorithm was applied to an actual case study in 110 kV system,and a magnetic field-circuit coupled simulation model was created with Maxwell-2D regarding the novel PMFCL topology,which verified the effectiveness of the proposed methodology and the optimized results.