for power PSS SIL model
surge impedance loading for 220 KV transmission line
about (SIL = 140 MW).
in area2 transmission line length 310 Km and load
140 MW the load voltage it is come dawn becose the
transmission line which is close to its surge impedance loading
The solution is to connect series capacitors to improve the voltage
at the load after the transmission line
If the capacitors are removed in the transmission line,
we will notice the voltage drop due to SIL