Interaction between AVR reactive power control and high power ac-dc Converter Control as possible cause of instability

Abstract

Abstract-TwoBoth oscillatory episodes produced great variation of active and reactive power in several 330 kV and 500 kV power system nodes.At first sight, these oscillations seemed inter-area electromechanical oscillations, but carried out studies suggest that this oscillatory behavior could be a consequence of interaction between Reactive Power Control of generators and the ac-dc Converter Control of high power loads.