Abstract

One of the ways to strengthen the DC power supply system of the main railways of Russia is the use of semiconductor voltage-boosting devices for voltage regulation at traction substations. The work of diode and thyristor bridge rectifiers connected in series with it is considered in the article. The analysis is performed under the condition that active and reactive resistances of the supply network and the converter transformer are zero. It was found out that, depending on the magnitude of the control angle, such a converter can have two modes of operation. For these modes, time diagrams of the rectified voltages of both the thyristor bridge and the entire converter are constructed. Expressions are obtained for determining the average values of the rectified voltages of a 12-pulse diode rectifier of a serial type and a 12-pulse thyristor rectifier of a parallel type connected in series with it. The calculation of the adjustment characteristics of this adjustable converter is performed.

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