Abstract
The possibility of employing microprocessors for direct digital control of thyristors depends on the required dynamics and the attainable resolution. This paper describes a firing-control-algorithm for a three phase thyristor AC/DC convertor. The scheme has been implemented on a commonly available microprocessor; it operates sufficiently fast, so that there is enough spare time to carry out the computations for superimposed current and speed control loops as well. Without further pulse forming the output of the processor initiates directly the gate firing amplifier. Current and speed control algorithms are of proportional-integral type with output limiting. The current signal is the only analogue variable requiring A/D conversion, since speed measurement can be performed by digital techniques thus disposing of analogue transmitters such as DC tachometers.
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