FREQUENCY SPECTRUM GENERATED BY THYRISTOR CONTROL

This paper describes the measured harmonics in the load currents of thyristor circuits and shows that with firing angle control the harmonic amplitudes decrease sharply with increasing harmonic frequency, but that they extend to very high harmonic orders of around 6000. The amplitudes of the harmonics are a maximum for a firing delay angle of around 90°.

[1]  W. FISHWICK,et al.  Semiconductor Controlled Rectifiers , 1965, Nature.