A PMU-based Protection Relay In The Presence of STATCOM

The transmission line compensated with STATCOM affects the operation of protection relays in the system. In this context the effect of Static Synchronous Compensator on loss of field failure protection is analyzed. The existence of STATCOM has a pernicious effect on the operating time of generator field failure relay. To reduce the adverse effect of STATCOM a new phasor measurement unit based loss of excitation protection scheme is modelled in MATLAB/SIMULINK. Phasor measurement unit are high speed sensors that are used to estimate the magnitude and phase angle at a rate of 48 samples per cycle which makes it to detect fluctuations in voltage or current. The effect of STATCOM on PMU based LOE protection scheme are analysed for complete field failure and partial loss of field failure. The simulation results depicts that a new phasor measurement unit based LOE protection relay detects and operates the field failure protection relay even in the existence of Static Synchronous Compensator in transmission line.