Abstract
The well-known control system of the active rectifier with negative phase-sequence voltage precontrol increasing stability of its operation in case of asymmetry of power voltage has been analyzed. The main characteristic of this system is the existence of the unit of a time delay, which together with the harmonic filter introduces an error between the true value of voltage and the selected reverse sequence signal. The control system of the active rectifier with the mains voltage precontrol in which there is no additional unit of a time delay is described. Three methods of the mains voltage filtering are analyzed and the optimum one is selected. Evaluation of the work of the active rectifier with advanced control system in case of different dips of voltage is made. The offered control system meets the delivered requirements and increases stability of operation of the active rectifier in case of the considered voltage dips.
Keywords
Rolling mill, active rectifier, control system, voltage dip, voltage unbalance.
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