Demonstration of Impact of STATCOM on Loss of Excitation Protection Through Real Time Hardware in-Loop Simulation

This paper demonstrates the impact of Static Synchronous Compensator (STATCOM) on generator loss of excitation protection. Presence of Static Synchronous Compensator (STATCOM) in transmission line affects the reach/operating time of generator loss of excitation protection relay depending upon the loading conditions. In this context hardware in the loop simulation by using real time digital simulator (RT-Lab), linear power amplifier and generator protection relay (MiCom P343) is performed to analyze the impact of Static Synchronous Compensator (STATCOM) on reach of loss of excitation protection relay. The hardware in the loop simulation is performed for total loss of excitation and partial loss of excitation. The obtained result clearly demonstrates that there is a delay in operating time of relay in the presence of Static Synchronous Compensator (STATCOM). The delay in operating time affects the coordination between loss of excitation protection, generator under excitation limiter and steady state stability limit.