Analysis and performance of hybrid thyristor-controlled three-phase resistive loads

The authors describe a method of analysis for and the performance characteristics of hybrid thyristor power controllers for three-phase resistive loads, Different circuit configurations having full-wave or half-wave control are discussed. It is shown that of the various configurations considered, the three-phase, three-wire, star-connected system with full-wave control offers the best overall performance, having a sensitive range of power control over a wide range of firing angles. Line current distortion is small, so that the circuit is characterized by high distortion factor and input power factor. For some applications such hybrid power controllers appear to be more suitable than conventional thyristor power controllers.<>