1 Hysteresis Current Control and Filtration

This paper presents an approach of harmonics control when harmonic components are present at the inverter output. The reduction of harmonics is important due to the fact that harmonic components have plenty of problematic features, including imbalanced and excessive neutral currents, interference in nearby communication networks and disturbance to other consumers, torque pulsations in electric motor drives and so forth. In order to get harmonics free output from a single phase half bridge inverter, an advanced modulation technique, based on the concept of minimizing the Total Harmonic Distortion (THD), which represents the ratio of non fundamental components to the fundamental components, by controlling current, has been illustrated in this paper. Furthermore, the implementation of an LC low pass filter, that is capable of blocking the higher harmonic components, is more convincing, as the comparative results of MATLAB simulation shows that the deviation of the actual modulated output current from the fundament modulated output current is only 0.013 %