Harmonic mitigation technique using active three-phase converters utilised in commercial or industrial distribution networks

Current harmonics generated by adjustable-speed drives (ASDs) are one of the main power quality concerns in commercial and industrial distribution networks due to a high number of ASDs. These harmonics affect the grid power quality, instability, resonances, and power losses. Therefore, different harmonic mitigation strategies using active front end have been proposed to tackle this issue. However, due to the cost-effectiveness, conventional front end such as diode rectifier is still recommended in industries for a broad range of three-phase power electronics systems. Thus, in this study, a new DC modulation method is proposed using three-phase diode rectifier with controlled DC-link current (boost converter) for grid harmonic elimination approach. Simulations and experiments have been carried out to validate the proposed concept that a selective harmonic can be eliminated from the grid using the developed strategy.