Читать книгу Microgrid Technologies - Группа авторов - Страница 54

As shown in Figure 2.21 with GUPFC and fuel cell in the system under intentional islanding condition, load voltage observed is 1 pu with a healthy system (i.e. between 0.0 and 1.0 s). A brief spike due to switching observed at the instant of fault (i.e. at 1.0 s). The load voltage rises to around 1.1 pu during three-phase to a ground fault between 1.0 and 1.5 s but minor unbalance is observed. The improvement in the load voltage is due to the presence of fuel cells and GUPFC. After clearing of the fault at 1.5 s the load voltage becomes normalized to 1 pu.

The load voltage again rises to 1.1 pu and remains constant during the single-phase to ground fault (i.e. during 2.0 to 2.5 s) with a brief switching spike at the instant of 2.0 s. After clearing of the fault, the load voltage becomes normalized to 1 pu.