Zero Harmonic Distortion Converter, formerly named True Unity Power Factor Converter, is a grid-tie converter with the sinusoidal current. This current is achieved by no use of a PWM high-frequency rectifier. Instead, there is a three-winding transformer with two converters using Selective Harmonic Elimination (SHE) modulation. Some harmonics are eliminated by SHE modulation while others are mitigated by the three-winding transformer. However, its use in a already distorted grid represents a challenge to eliminate current distortions. This article discusses the implementation of a set of angles for selective harmonic elimination modulation that generates a lower level of non-eliminated harmonics and that contributes to better total demand distortion (TDD) levels for the converter current. The modulator change was able to reduce the TDD of the current on the power grid from 7.39% to 2.41%, within the limits recommended by IEEE 519–2014.