Fig. 13

Transition between grid-connected and islanded modes. The switching between grid-connected and islanded modes is occurred at time 2.5 sec. The microsource dynamic responses including dc voltage tracking, frequency synchronization, the power sharing as well as ac voltage tracking (amplitudes at output terminals). The lines correspond to the microsources at: bus 3, ’–’, bus 6, ’- -’, bus 7, ’..’, bus 10, ’-.’. Moreover, the lines correspond to other microsources at: bus 4, ’ >-’, bus 5, ’+-’, bus 8, ’x-’, bus 9, ’o-’, bus 11,’*-’