Increasing the electrical energy quality in electric power supply systems of stationary railway transport facilities

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Development of a technique of simulating railway electric power supply system modes equipped with devices for improving the electrical energy quality in networks powering stationary railway transport facilities. Two structural concepts were considered that provided unbalance reduction and voltage deviations on 0,4 kV buses of substations powering these facilities. The first one was based on the use of negative boosting transformers, and the second one - on the use of lines with an electrically grounded live wire. Two methods of connecting these transformers were considered: into insulated rail joints and into the return wire. The studies were carried out using the Fazonord software package ensuring complex simulation of the modes of railway power supply systems in phase coordinates. To determine the influence of negative boosting transformers and lines with the grounded live wire on the electrical energy quality indicators, an intersubstation zone of the traction network of a double-track 25 kV alternating current railway road with a length of 45 km is considered. The results obtained allowed drawing the following conclusions: when using negative boosting transformers that were connected to the rail break, the average value of the reverse sequence unbalance factor on the 0,4 kV buses of the facility substation was reduced by 2,5% in comparison with the absence of these devices; in the presence of transformers connected to the return wire, this indicator decreased by 19%. The use of line with the grounded live wire instead of a "two wires - rail" line allowed obtaining the electrical energy quality on the 0,4 kV buses. With that, the maximum of the reverse sequence unbalance factor was reduced by 40%. On the basis of computer simulation, it was shown that the use of negative boosting transformers with the return wire and 25kV lines with the grounded live wire makes it possible to improve the electrical energy quality in the systems of the electric power supply of stationary railway transport facilities.