Superposition of Voltage Disturbances Generated by Direct Current Traction

Electric traction vehicles require a power supply with appropriate voltage parameters. In Poland, a direct voltage power supply system has been adopted. This requires the use of traction substations with the conversion of alternating voltage to direct voltage, which generates a number of disturbances related to the quality of electric power. Dynamic changes in the substation load resulting from the movement of traction vehicles are another cause of voltage changes. The article presents an analysis of measurement results carried out simultaneously in systems powering various traction substations and non-traction demand lines. Due to the fact that non-traction demand lines supply both recipients related to the movement of traction vehicles (including railway stations) and other industrial and municipal recipients, the quality of energy is therefore very important.