Impact of fault resistance and fault distance on fault current reduction ratio of hybrid SFCL

Abstract

Summary Superconducting fault current limiters (SFCLs), as the novel power system devices, have attracted attentions in the last years. However, in order to achieve the maximum benefit from SFCLs, their interaction with power system should be comprehensively evaluated before equipping the power system with them. This paper investigates the effect of fault resistance and fault distance on the steady‐state fault current reduction ratio (FCRR) of hybrid SFCL. Based on the equivalent circuit model, analytical studies are presented to obtain the relation between 2 abovementioned factors and the FCRR of hybrid SFCL. Then, through the detailed simulation studies, the current limiting behavior of hybrid SFCL is evaluated when the value of fault resistance and the position of fault change in wide range. As a result, although the hybrid SFCL is able to reduce the fault current under different circumstances; however, FCRR significantly varies under outside the control changing circumstances. For far faults and faults with high fault resistance, the FCRR of hybrid SFCL is not as good as the other fault conditions. Hence, in the last section of the paper, the remedial actions to enhance the performance of hybrid SFCL during these conditions are proposed.

Studying a novel method for mitigation of the adverse impacts of SFCL on transmission line distance protection

“…Moreover, in the presence of HSFCL, the HTS element does not quench for far fault with high fault resistance. Since the current is lower than the critical current of superconductor [28]. Therefore, during this circumstance, the insertion impedance by HSFCL is zero and trip characteristics of the conventional method in presence of this device exactly coincides with the case that no SFCL is used.…”

Sustainable protection coordination in presence of distributed generation with distributed network

“…In order to retain production coordination and DGs fault current reduction, FCL and SFCL were applied in previous studies . But FCL causes continuous power dissipation due to permanent connectivity in the power network.…”

“…A similar multi-agent technique is represented in Wan et al 21 In order to retain production coordination and DGs fault current reduction, FCL and SFCL were applied in previous studies. [22][23][24] But FCL causes continuous power dissipation due to permanent connectivity in the power network. This power dissipation was eradicated by using SFCL because of its zero resistance characteristics during normal operation but SFCL are not recommended because of high cost.As a conclusion, protection coordination is hot research area nowadays, which is highly effected by DG contribution in fault current.…”

Investigation of the performance of distance relay in the presence of saturated iron core SFCL and diode bridge type SFCL

“…As above, it is expected that FCL is widely used in the power system in the future. However, it is necessary to consider all facets associated with the installation of FCL in the power system . One of the aspects is the impact of FCL installation on the distance relay performance.…”

“…However, it is necessary to consider all facets associated with the installation of FCL in the power system. [8][9][10][11] One of the aspects is the impact of FCL installation on the distance relay performance. Conventional distance relay effectively detects the occurrence of the faults in a transmission line with the help of six impedance measurement units.…”