Evaluating interaction between high speed power system controllers

Control coordination of fast acting voltage devices is considered of great significance in the electric utility industry as the existing transmission systems are expected to operate at higher loadings. Coordination of the controls of static VAr compensators, DC transmission systems and power system stabilizers will maximize the loading capability of the network. The available study tools are identified along with how they might be applied to coordinate controls. A procedure for coordinating controls for electromechanical and electromagnetic interactions is presented. A "global gain margin" is defined.