Harmonics and technical barriers in adjustable speed drives

All thyristor adjustable-speed drives, unlike fixed-speed ones, generate harmonics to some degree. Harmonics are currents and voltages that are multiples of the fundamental 60 Hz frequency. Any power converter that converts AC to DC or DC to AC can be considered to be a source of harmonics. The characteristics of harmonics produced by an adjustable-speed drive system, methods of reducing them, and installation examples are presented.<
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