CONTROL STRATEGIES FOR MULTIPLE STATIC VAR COMPENSATORS IN LONG-DISTANCE VOLTAGE SUPPORTED TRANSMISSION-SYSTEMS

This paper addresses the small-signal stability and control problems a ssociated with a long distance voltage supported AC transmission syste m. Linear techniques are used for the control design of multiple stati c VAR compensators along the transmission system. Different voltage co ntrol strategies are investigated and additional stabilizing signals a re designed using frequency response techniques. A new centralized con trol strategy s proposed and its performance is shown to be superior t o the traditional individual bus voltage control. Linear time response s to step disturbances are included to illustrate the performances of the different control strategies investigated.