FOPIR controller for TCSC based gate turn-off switches to control power quality in transmission line

The transistor has the problem of inability to tolerate high voltage, which leads to power quality issues in high power applications. Therefore, to solve this problem, a thyristor controlled series compensator (TCSC) is adopted, which will reduce the power quality problem in high power applications integrated with renewable systems. However, to reduce the effect of thyristors in TCSC, the gate turn-off (GTO) thyristors are employed. Also, the cost of the system is reduced by using PV based DC supply to the compensator. However, the supply from the renewable system is not constant, which induces harmonics and oscillation in output voltage. This results in an unsynchronized supply between the grid voltage and the renewable system, which has been reduced by using a novel controller that generates switching pulses for the GTO to reduce distortion in the output voltage. Since the GTO works well with switching signals rather than gate voltage, an effective control signal generation scheme is required. Therefore, this paper introduces a novel Fractional Order Proportional Integral Retarded (FOPIR) controller optimized by the Rock Hyraxes algorithm. As a result, the proposed controller reduced the harmonics to 17.52% with respect to the PIR controller.