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Reactive power source capability allows active-frontend converters with average-current-mode control to be used as reactive power compensators in addition to their primary function as ac-dc converters. Reactive power control in these converters can be realized in multiple ways by adding a suitable controller to the current control loop. The paper presents a comprehensive study of reactive power control realizations in a single-phase AFE converter, along with their merits and limitations, including susceptibility to the ac line noise. Different forms of the reactive power controller are derived in a systematic way by using a closed-loop dynamic model of the converter. Theoretical analysis and simulation results are verified by experiments.