The study of reactive power characteristic of impact converter load is of great significance forreactive power compensator and the stable operation of electric power system. In this paper

based on thestructure feature and operation mode of impact 4 quadrant converter load

the displacement factor andreactive power analytic expression is derived through using the active power balance principle of AC-DCsystem

and three-dimensional curve model of the reactive power influence factor is set up

the reactivepower feature under various operation mode is deeply analyzed

the influence rule of the operation mode

DC current and triggering angle on the reactive power is mainly summarized. The theoretical analysis ofthe reactive feature is verified by the experiment and the result show that the actual reactive power featureof the converter system of the EAST device is identical to that of theory.