CONVERSION AND DISTRIBUTION UNIT FOR TRACTION POWER SUPPLY SUBSTATIONS

Abstract

Intense development of power semiconductor units allows designing powerful arcless disconnection devices which could make a single set along with conversion units of traction substations. The authors suggest a promising design of conversion and distribution 3,3 kV unit for DC power traction substations, that has some technical and economic advantages. The circuit is realized with the help of controlled 12 pulse rectifier, built without cathode groups of cells in the second bridges of rectifiers. Three-phase switches of feeders are assembled on thyristors, and the cathodes there-of are electrically interconnected and create the terminals of direct current. The main elements of the unit are described and the algorithm of its operation is studied. Using the MATLAB software, the authors have created mathematical model of traction substation and simulated disconnection of a short-circuit at one of the feeders of overhead catenary, while considering a traction load at the other feeder. To make better demonstration of the model, the results of simulation are shown as an oscilloscope pattern, where the process of disconnection is divided into several stages.