Abstract
To obtain a current source with high voltage and high current from a single phase supply, a solution is a series-connection of two thyristor bridges. In spite of a sequential control of the conveners, the power factor of the system remains low because of the consumed reactive power inherent to thyristor structures and because of the harmonic content of the input current. Nevertheless a power factor improvement of this structure is possible when using semiconductors with turn-off capabilities associated with PWM control and power filters. Subsequently different control strategies are considered in this paper as they are determinant for both the filters raring and the overall efficiency of the system.
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