Active suppression of low-frequency disturbances on AC side of traction active current-source rectifier

This paper deals with traction 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/16⅔ Hz. The new control strategy able to operate under distorted trolley-wire voltage and actively suppress (i) low-frequency disturbances in trolley-wire current caused by distorted trolley-wire voltage, and (ii) input LC filter oscillations is presented. Proper function of proposed control strategy has been verified by simulations and large experimental study made on designed small-scale prototype of ACSR of rated power of 7kVA.