Estimation of the parameters of filter for AC pulse equipment – regulators, converters is considered in this paper. The way to calculate parameters for the filters on the base of load inductance and switch duty ratio of AC/AC choppers introduced in circuit of reactive load – coil is shown. For damping of current oscillations in a grid circuit LC filter is introduced with the evaluated and presented operation regimes and calculation expressions. Computer modeling is made and the results of mathematical research and computer modeling are shown.