Single-phase current-source active rectifier: New approach in active suppression of low-frequency disturbances on converter AC side

This paper deals with a single-phase active current-source rectifier (ACSR) developed within the research into a new generation of main traction converters employing medium-frequency transformer dedicated for suburban units operating on both ac electrification systems of 25kV/50 Hz and 15kV/16, 7 Hz. The new approach in active suppression of low-frequency disturbances in trolley-wire current using resonant (R) controllers is presented. Proper function of proposed control strategy with a new compensative principle has been verified by simulations and large experimental study made on designed small-scale prototype of ACSR of rated power of 7kVA.