SVC and power transformers controllers coordination

The use of shunt compensators such as FACTS (for example SVC) in power systems gives possibility of fast and flexible control of voltage or reactive power. An efficient cooperation between a transformer and compensator connected to busbars, or transformer´s tertiary winding, requires a proper coordination of controls. The article contains theoretical considerations and simulation results which indicate that such coordination is necessary. The principal recommendations for the transformer and compensator controllers settings and the coordination between control systems have been presented.