Non Sinusoidal Modes of Traction Power Supply Systems Equipped with Reactive Power Compensation

Abstract

—Rectifier electric locomotives create essential harmonic distortions in tractive electric power supply systems. Because of the higher harmonics, overloads on capacitor banks are possible. Capacitors are a basic element of reactive power sources applied in power supply systems. In case of harmonic increased levels such overloads can lead to out of reactive sources operation. Therefore the task of possible overload prediction has the practical significance. It acquires special relevance when planning the pass of increased mass trains. In article the computer simulation technique allowing to define an capacitor batteries overload in the presence of higher harmonics currents is described. It is shown that the task of overload prediction can be solved by means of nonsinusoidal mode simulation for the schedulable amount of train movement by the methods and means developed at the Irkutsk state transport university. Simulation was carried out by the program Fazonord complex for the tractive power supply system including five inter substation zones of 27.5 kV two-way tractive network section. The received results showed that overloads of capacitor banks can be lowered to acceptable values by means of the protective reactor. In case of reactor switch-off an overload coefficients become unacceptably big. The offered computer simulation technique gives the chance to define capacitor batteries overloads in the presence of a non-sinusoidal curve currents and voltage. Technique application in practice will allow avoiding emergency situations which can lead to failure of the expensive equipment.