Adjustable Speed AC Drive Systems for Pump and Compressor Applications

The paper covers the application and performance of a cycloconverter type frequency converter and a doubly fed wound rotor ac motor as applicable to adjustable speed drive systems for pump and compressor loads. The paper covers the subject by discussion of the following: 1) basic theory and operation of a cycloconverter and a doubly fed wound rotor motor; 2) motor and converter ratings to meet the performance requirements of typical pump and compressor applications; 3) control schemes for starting, running, and process control; 4) efficiency and power factor; and 5) summation, including advantages of adjustable speed ac drive systems and static frequency conversion equipments.