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With IEEE 9 bus test model, as shown in Figure 2.16, various fault conditions such as three-phase to ground fault and single-phase to ground fault are simulated with and without grid connection using MATLAB simulation, as illustrated in Figure 2.17. The results are presented for test cases with and without GUPFC, with and without fuel cell (distributed generation) and with active GUPFC. Three-phase to ground fault shown from 1.0 to 1.5 s on time axis whereas single phase to ground fault shown between

Figure 2.14 Simplified test system.

Figure 2.15 Test system simulation.

Table 2.2 Test system simulation events.

S. No.	Time (s)	Event
1	0.00	Start
2	1.00	Fault on A and B phases
3	1.02	CB opens (disconnect sub-system from main system)
4	1.50	Fault Clear
5	1.52	CB close (connects sub-system to main system)
6	2.00	Fault on B and C phases
7	2.02	CB opens (disconnect sub-system from main system)
8	2.50	Fault Clear
9	2.52	CB close (connects sub-system to main system)
10	3.00	End