Reactive power compensation in electrical traction Using Active impedance concepts

Traction systems are huge consumers of reactive power. It due to the presence of inductive reactance in traction transformer, traction motors, auxiliary motors, smoothening reactor. Reactive power keeps on varying in a traction substation as the number of locomotives increases and decreases in its working environment. As a result of this a detailed study of reactive power is required in traction substation and the traditional fixed capacitors should be replaced with active filter based on PI controller.