Sasan Yousefi - Electrical Engineering Department Amirkabir University of Technology (Tehran Polytechnic) Tehran, Iran
Aydin Zaboli - Electrical Engineering Department Amirkabir University of Technology (Tehran Polytechnic) Tehran, Iran
Mohammad Mahdi Hosseini-Biyouki - Electrical Engineering Department Amirkabir University of Technology (Tehran Polytechnic) Tehran, Iran
Hossein Askarian-Abyaneh - Electrical Engineering Department Amirkabir University of Technology (Tehran Polytechnic) Tehran, Iran

In electric railways, thyristor rectifiers are used in order to control the speed. As a consequence in addition to substantial input lead current, an enormous amount of harmonics is injected into the grid. To avoid such harmonics as well as reactive power compensation, reactive power hybrid filters consisting of active and passive filters are utilized. Hybrid filters have several different structures. Since electric railway has a non-linear and variable nature, a novel hybrid filter structure is designed that compensates reactive power and eliminates harmonics to attain desired harmonic level regarding the conventional allowable harmonics level standards. The designed filter model is simulated in MATLAB/SIMULINK and then applied to a harmonic model of an electric railway.

Non-linear loads; reactive power compensation; harmonics elimination; hybrid filters