Simulation
Run the simulation and observe waveforms on the main variables scope block. The TCSC is in the capacitive impedance control mode and the reference impedance is set to 128 Ohm. For the first 0.5s, the TCSC is bypassed (assuming a circuit breaker), and the power transfer is 110 MW. At 0.5s TCSC begins to regulate the impedance to 128 Ohm and this increases power transfer to 610MW. Note that the TCSC starts with alpha at 90deg to enable lowest switching disturbance on the line.