Повышение устойчивости сверхдальних линий электропередачи переменного тока на основе распределенного управления устройствами FACTS

Abstract

Steady-state operation modes and stability of a long-distance extra-high voltage transmission line equipped with FACTS devices are studied. The capabilities of increasing the transmitted power limits to a level of more than 30% above the power line surge impedance loading are shown. The effect the coordinated control of FACTS devices has on the power line small-signal stability is analyzed. By incorporating the power transmission full phasor difference feedbacks into the FACTS device control systems it becomes possible to obtain good small-signal stability indices in the entire range of power transmission operation. Tt has been found that a quite moderate response speed is required in measuring, transmitting, and converting such signals. The transient stability of a long-distance extra-high voltage ЛС transmission line under two-phase short-circuit on the power plant buses is calculated, and the need of using additional emergency controls to maintain its stable operation is shown.