Development of new technologies and functions for the on-line TSC system

The on-line TSC (transient stability control) system is the world's first online-type stabilization system for electric power systems, which realizes optimum stabilized control of moment-by-moment power system conditions by obtaining power system information online and carrying out stability calculations at certain intervals. Over ten years have passed since the start of operation of this system, and during this time it has received the 44th Edison Award and is now well reputed for its excellence both in Japan and abroad. This paper discusses the challenges this on-line TSC system has so far faced in its actual operations and our development of new technologies and functions to overcome these challenges. The new technologies and functions thus developed are believed to raise the accuracy of the stability control of the power system and contribute to cost reduction.