Analysis of and Inductance Estimation for Half-Controlled Thyristor Converters

Operating diagrams are developed for single-phase as well as three-phase half-controlled thyristor converters connected to a general resistive, inductive, and EMF load. With the help of these diagrams, modes of operation of such converters are identified. Once the operating mode is identified for any given set of load circuit parameters and trigger angle, then the corresponding equations can be chosen with which the performance analysis can be carried out. Minimum inductance necessary in the load circuit for continuous current operation of three-phase converters is evaluated through a method wherein the load circuit resistance is neglected. A graphical solution is given for the evaluation of minimum inductance in those cases where the load circuit resistance may not be negligible.