Improvement of transient stability analysis methods in verification of wide area control systems for long-distance AC interconnection

Transient stability enhancement is an important issue for all large power systems in the world especially in case of widespread blackouts. In order to increase transient stability level, various technical devices and methods are developed in electrical power system such as wide area control system (WACS). The method of transient stability level assessment on the basis of equal acceleration/deceleration area calculations, similar to D-decomposition in small-signal stability analysis, is proposed and used for finding the optimal settings of excitation (AVR+PSS) and governing control (AGC) with additional signals from wide area measurement system (WAMS) in two-machine test scheme.