Power transmission systems¿today and tomorrow

The Importance ot system stability and reactive compensation has been recognised for many years for satisfactory operation of a.c. power transmission systems, which may be either highly interconnected networks like the British National Grid system or provide point-to-point transfer over long distances. The impact of the relatively new solid-state devices on these two aspects of power transmission has already been considerable: first, from a computational viewpoint, for the offline prediction of system behaviour and, more recently, online control; and, secondly, for the rapid control of large amounts of power by thyristors