Based on the achievements in the former researches
instantaneous reactive power theory is applied to the control of static var compensator(SVC) to increase power factor of power supply system and to compensate three-phase unbalanced load.The model of SVC which may compensate three-phase load is established with PSCAD/EMTDC.Through theoretical analysis and simulation
it proved that the software PSCAD/EMTDC and the established simulation model can simulate the circuits of three-phase unbalanced loads which compensated by SVC accurately.