Using the virtual resistance control method to reduction oscillations in the input LC filter of AC-DC rectifiers

Using the virtual resistance control method to reduction oscillations in the input LC filter of AC-DC rectifiers This paper examines an important topic called Total Harmonic Distortion (THD) of input current in ac-dc rectifiers. It is especially important in high-power electric vehicle charging stations, which causes oscillations in the power grid.Since the in the rectifiers the input LC filter has the role of filtering and reducing oscillations.In this paper, changes are applied to the rectifier controller, which makes the LC filter behave like an RLC filter.which causes the damping of the input current oscillations to the power grid. Since it does not use any real resistance, the efficiency of the converter does not decrease and losses do not increase. Therefore, it is called virtual resistance control method. It can be considered in series or parallel with inductor or capacitor.This research is to reduce oscillations in high power loads in steady state, which can reduce losses in the filters of the chargers. In the following, the simulation results of the battery charger rectifier are in steady state, And finally to validate it The proposed method has been implemented in a laboratory and the results have been displayed.