The controller is typically of the proportional–integral (PI) type that outputs

the desired susceptance signal within the preset limits, as discussed in Chapter

4. A linearizer block converts the susceptance signal into a firing-angle signal.

An operation-mode selector unit is generally used for TCSC protection.

During short-circuit conditions, at which time the current through the metaloxide

varistor (MOV) exceeds a threshold, the TCSC is made to switch to the

bypassed-thyristor mode or the thyristor-switched reactor (TSR) mode. In this

mode, the thyristors conduct fully (j c 1808), reducing both the TCSC voltage

and the current substantially and thereby reducing the stress on the MOV.

During the clearance of faults, the “waiting mode” is implemented when the

capacitors are brought back into the circuit, a dc-voltage offset builds up that

is discharged into this waiting mode.

The steady-state control characteristic-The controller is typically of the proportional–integral (PI) type that outputs

the desired susceptance signal within the preset limits, as discussed in Chapter

4. A linearizer block converts the susceptance signal into a firing-angle signal.

An operation-mode selector unit is generally used for TCSC protection.

During short-circuit conditions, at which time the current through the metaloxide

varistor (MOV) exceeds a threshold, the TCSC is made to switch to the

bypassed-thyristor mode or the thyristor-switched reactor (TSR) mode. In this

mode, the thyristors conduct fully (j c 1808), reducing both the TCSC voltage

and the current substantially and thereby reducing the stress on the MOV.

During the clearance of faults, the “waiting mode” is implemented　when the

capacitors are brought back into the circuit, a dc-voltage offset builds up that

is discharged into this waiting mode.

The steady-state control characteristic