Power flow analysis and optimal locations of resistive type superconducting fault current limiters

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Table 1 Optimal installation strategies for SFCLs according to the step-resistance and E–J power law models

Step-resistance model
Maximum fault current reduction (%):	290	400	470	480	495
No. of measuring conditions with/without FCR:	6/2	7/1	8/0	8/0	8/0
Number of installed SFCLs:	1	2	3	4	5
SFCLs’s locations:	2	2, 3	2, 3, 4	1, 2, 3, 4\(^{\mathrm{a}}\)	1, 2, 3, 4, 5
No. of measuring conditions with/without FCR:	7/1	8/0	8/0	8/0	8/0
Accumulated FCR (%) for max. no. of measuring conditions:	130	330	470	480	495
Number of installed SFCLs:	1	2	3	4	5
SFCLs’s locations:	5	1, 2	2, 3, 4	1, 2, 3, 4	1, 2, 3, 4, 5
E–J power law model
Maximum fault current reduction (%):	220	330	375	395	395
No. of measuring conditions with/without FCR:	6/2	7/1	8/0	8/0	8/0
Number of installed SFCLs:	1	2	3	4	5
SFCLs’s locations:	2	2, 3	2, 3, 4	2, 3, 4, 5	1, 2, 3, 4, 5
No. of measuring conditions with/without FCR:	7/1	8/0	8/0	8/0	8/0
Accumulated FCR (%) for Max. No. of measuring conditions:	120	250	375	395	395
Number of installed SFCLs:	1	2	3	4	5
SFCLs’s locations:	5	4, 5	2, 3, 4	2, 3, 4, 5	1, 2, 3, 4, 5

The maximum fault current reduction (FCR) value (per case) has been calculated as the sum of the percentage reductions of the fault current measured at the wind farm output, the integrated point, and branches 1 and 2, for the three fault conditions shown in Fig. 1. The fault current was not reduced at all measuring locations, as shown in Fig. 8. Therefore, the table also shows the values for the accumulated fault current reduction when the fault current was reduced for the greatest number of measuring conditions
^a Same performance is achieved when the four SFCLs are located at the positions 2, 3,4, and 5