The Power Quality issues Due To connecting an Electric Train To a Power Supply System Through V/V Transformer

摘要

The wide application and usage of electrical traction system presents utilities with planning and operation challenges. Electric railways impose several power quality problems to the utility grid. Such as generated large negative sequence components (NSCs), undesirable harmonics, cause system voltage and current unbalance. Harmonic and unbalanced voltage also may cause negative effects on the components of the power system such as: overheating the transformers and the transmission lines, vibration and causes torque reduction of rotating machines, additional losses of lines and transformers, interference with communication systems, malfunctions of protection relays, measuring instrument error. All these problems have become more and more significant. This paper is an attempt to quantify and assess the impact of electrical traction on the grid side through a V/V transformer.