The comparative analysis of the inverse parallel connected thyristor-thyristor and thyristors-diode power controller configurations are presented in this paper. The controlled variations of the r.m.s value of the alternating voltage applied to a load via power controller scheme were examined. Analyses of the first fundamental component of the Fourier series of the load current were presented. The normalized value of the load current (ILnorm) at various firing angle () varying from 0 to 180° were obtained and plotted for both the thyristor-thyristor and the thyristor- diode configurations. The result shows that the applied power to the load can be varied from 1.0 to 0.0per unit and from 1.0 to 0.707 per unit for thyristor-thyristor and thyristordiode configurations respectively. The analysis further revealed that 100% control (Fully controlled) can be achieved using thyristor-thyristor configuration, while about 70.7% (half controlled) can be achieved using thyristor- diode configuration. The domestic and industrial application of these schemes will be imperative in minimizing power loss, thereby increasing production efficiency and control.
