Power Quality Improvement in the Grid via High-power AC Regenerative Electric Drives

This paper considers the problems of power quality that arise in the grid via powerful regenerative AC drives with active front-end rectifiers (AFE). The results of practical studies show that the correct choice of the PWM method with selective harmonic elimination (SHEPWM) for AFE can significantly reduce the THD in the grid. It is also noted that it is expedient to calculate THD up to the 150th harmonic, since in this case it is possible to perform a more accurate assessment of electromagnetic compatibility. It was concluded, the main direction to improve power quality of high-power AC regenerative electric drives in the grid is to optimize PWM algorithms for AFE rectifiers.