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Figure 2.20 shows the load voltage profile in intentional islanding condition with GUPFC and without fuel cell. At normal healthy working conditions between 0.0 and 1.0 s, the load voltage observed around 1 pu. A three-phase to ground fault observed between 1.0 and 1.5 s. After the occurrence of fault at 1.02 s generator at the bus no. 3 and load at the bus no. 5 get islanded from the main system. A spike due to switching seen at the instant of 1.0 s. During islanding conditions (i.e. between 1.02 and 1.5 s), the load voltage rises to around 1.1 pu. The load voltage gets normalized to 1 pu when islanded part of the system reconnected with the main system (i.e. between 1.5 and 2.0 s) During the single-phase to ground fault (i.e. between 2.0 and 2.5 s), the load voltage rises to around 1.1 pu due to the intentional islanding of the generator at the bus no. 3 and a load at the bus no. 5. The voltage profile improves due to the islanding of a balanced system.

Figure 2.20 Load voltage profile in test case-3.