TRANSIENT EXCITATION BOOSTING AT GRAND COULEE 3RD POWER-PLANT - POWER-SYSTEM APPLICATION AND FIELD-TESTS

Transient excitation boosting (TEB) has been installed on the Grand Co ulee Third Power Plant hydrogenerators (three 600 MVA units and three 700 MVA units). TEB is initiated for outages of the 3100 MW Pacific HV DC Intertie, and results in a decaying pulse input to the generator vo ltage regulators. TEB temporarily raises Pacific Northwest transmissio n voltages which increases voltage-sensitive loads. The increased load brakes Northwest generators which are accelerating because of the los s of HVDC Intertie power. Transient stability of the parallel Pacific AC Intertie is thus improved. Power system-wide commissioning tests we re conducted on May 7, 1991. We describe the tests and compare test re sults with simulation results.