PRINCIPLE OF A DUAL CURRENT SOURCE CONVERTER FOR AC MOTOR-DRIVES

Theprinciple of operation of a dual current source converter is briefly explained. The combination of two single current source converters (SCSC) to form a “dual (duplex) current source converter” (DCSC) is proposed. The DCSC is shown to have the following merits: 1) it retains all the advantages of the SCSC; 2) it reduces the harmonic content of the current waveform considerably; and 3) since the load current is shared equally between two current source converters, ratings of the individual components employed in the circuit are considerably lowered. A DCSC can be an attractive choice for-sophisticated large horsepower drives where a good performance of the drive rather than cost is a prime factor. An open-loop control scheme employing the DCSC for an ac motor drive has been successfully implemented in the laboratory. Oscillograms of the improved load current waveforms are shown. © 1979 IEEE