Abstract
The functioning of an alternating current (AC) voltage regulator based high voltage direct current (HVDC) power supplies with better input and output performances has been presented in this paper. The authors have incorporated a 3-phase series limiting inductor, along with detuned passive Alter in each power supply, to take care of line harmonics and the input power factor (IPF), which is simple, cost effective, reliable and provides input performance matching that of an equivalent active Alter. Such arrangement has special significance for controlled HVDC power supplies supplying to fixed load but operated from widely varying input voltages. It achieves line voltage total harmonic distortion (THD) below 4% and IPF better than 0.97, for 415 V – 30% to 415 V + 10% variations in 3-phase input voltages. A properly designed crowbar, along with suitable limiting elements, is incorporated in each power supply and stringent wire survivability tests were carried out to limit klystron fault energy below 10 Joules. Several simulated waveforms and experiment results are also presented.
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