Page 402 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

Microgrid for High-Surety Power: Architectures, Controls, Protection, and Demonstration 389

[2.000 s/div]
Grid voltage v g (400 V/div)
0
SC current i (100 A/div)
b
0

0
Gas current i (100 A/div)
g
DC bus voltage v Bus (200 V/div)

(a)

[100.0 ms/div]
Grid voltage v (400 V/div)
g
0
SC current i b (100 A/div)

0
0
Gas current i (100 A/div)
g
40 V DC bus voltage v Bus (200 V/div)

(b)

FIGURE 14.36 Waveforms of transferring from grid normal mode to gas engine power mode. (a) Transferring
waveform. (b) The waveform zoomed in when grid fails.

Fault occurs Isolate fault successful
[20.00 ms/div]
Load voltage v l (200 V/div)
Load voltage v l (200 V/div) [6.400 us/div]

0 Load current i l (50 A/div) 0 Load current i l (50 A/div)

0
0
Fault current i s (500 A/div)
Fault current i s (500 A/div)
Voltage of SSB v b (200 V/div) Voltage of SSB v b (200 V/div)
0 0
(a) (b)

FIGURE 14.37 Waveforms of short-circuit fault protection in DC module. (a) Short-circuit protection wave-
form. (b) The waveform zoomed in.