A generic protection system for interline power flow controllers is proposed. An effective protection algorithm manages and coordinates the PFC controllable switches and protection switches in the fault operations. The principle of the Power Flow Controllers protection system is based on the by-pass of uncontrollable PE switches for current protection while the voltage protection is guaranteed by the OverVoltage Limitation (OVL) devices across the voltage source and/or across the PFC itself. If required, Rate of Rise OverCurrent Limitation (OCL) devices are added.
Concepts validated in EMT simulation.