Abstract
One of the main tasks of a railway power supply system is the provision of increased traffic volumes especially on direct current railway sections. For this reason the personnel of traction substations uses various means and methods of power supply strengthening including boosters representing two parallel thyristor bridges shunted by diodes. The paper considers three processes of commutation of rectifier currents arising in boosters: between two thyristors, between a shunt diode and thyristors and between thyristors and a shunt diode. The paper presents a detailed mathematical description of these processes. As a result, the authors gained a general formula for calculation of all three angles of commutation, with the use of which the authors have carried out all calculations. Reliability of gained expressions is confirmed on a physical model.
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