In this paper, a reactive power compensator is used for stabilization of the low voltage distribution line, and a novel reactive power control method of the Reactive power compensator is proposed to reduce size as well as maintain its long lifetime. The new reactive power control method using DC link ripple voltage mitigation technique and iterative controller compensation technique for compensating lower harmonic components is described. The performance of reactive power control algorithm is verified through simulation and experiment. A reactive power control is performed by controlling the d-axis current in the virtual synchronous reference frame, and the voltage control for maintaining the DC link voltage is implemented through the q-axis current control. The proposed method for compensating the ripple voltage effect consists of an extraction unit of DC link ripple voltage, high pass filter (HPF), and time delay unit. The HPF removes an offset component of DC link ripple voltage caused by an integrator, and a time delay unit compensates the phase leading effect due to the HPF. The compensated DC link voltage is used as a feedback component of voltage control loop in order to supply the stable reactive power. The performance of the proposed algorithm is verified through simulation and experiments. In case that DC link capacitor is 375uF, an effect of ripple voltage is reduced to 8Vpp from 74Vpp in the voltage control loop, and total harmonic distortion (THD) of the current is improved. The reactive power control method using the repetitive controller compensation technique is a repetitive controller to control the fundamental components through the PI controller and to compensate the lower harmonic components in order to stably inject ground or phase reactive power to maintain the line voltage at the setpoint voltage. A parallel connection with the PI controller is applied. The iterative controller performs the role of removing even-order harmonic components as implemented in the synchronous coordinate system and implemented as a discrete time function. In the case of the repetitive controller applied to the reactive power compensator, simulation and experiment confirmed that even-order harmonics were compensated, and the performance of the proposed algorithm was verified from the results of improving the current THD from 6% to 1%.