Page 153 - Hybrid-Renewable Energy Systems in Microgrids

Study of control strategies of power electronics during faults in microgrids 137

Figure 7.10 Control structure of a VSI operating in islanded mode with negative-
sequence control loop.

feeder resistance and reactance are shown in Table 7.2. The fault level and R/X ratio
of the utility network (10 kV, 50 Hz) are 300 kVA and 5, respectively.

5.2 Steady state

This section examines the operation of the microgrid under two different modes. In
grid-connected mode, VSI 1, 2, and 3 initially deliver 30, 40, and 10 kW at unity
power factor receptively. All the loads consume 8.07 kW active power. The microgrid