A single three phase variable speed drive with unity power factor

The new proposed topology for a single three-phase variable speed drive was developed after considering the advantages and disadvantages of previous topologies. The new topology employs only six switches that form and active front-end rectifier and a four-switch inverter. The active front-end rectifier is the first leg of the three-phase bridge. It not only rectifies the voltage source but it also regulates one of the phases for the motor. The four-switch inverter produces the variable frequency. Excessive distortion currents drawn by a converter can cause voltage distortions. For this reason the converter should draw a high quality sinusoidal current from the supply. Excessive currents drawn from the supply are also the result of poor power factors. The converter should therefore operate at close to unit power factor. N Mohan, T Underland, W.P Robins [3].

Grantor dc:publisher.institution

Department of Electrical Engineering

Year dc:date.issued

2000

Author dc:creator

• Douglas, Hugh

Advisor dc:contributor.advisor

• Malengret, Michel

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/11427/5274

OAI identifier oai:identifier

oai:open.uct.ac.za:11427/5274