Title :
AC/DC/AC high voltage traction drives with quasi-zero reactive power demand
Author :
Bertini, Sandro ; Ghiara, Tommaso ; Marchesoni, Mario
Author_Institution :
Dept. of Electr. Eng., Genoa Univ., Italy
fDate :
10/1/1993 12:00:00 AM
Abstract :
A novel AC/DC/AC conversion structure has been developed, referring to single-phase AC (25 kV/50 Hz) traction systems using induction motor drives. High-voltage converters delivering multilevel voltage waveforms with lower harmonic content have been employed on both the line side and the motor side. High-performance techniques have been studied for controlling the whole system, assuring a quasi-unitary power factor and a low distorted line current. The control system was designed following VSS (variable structure system) principles, obtaining high-dynamics responses and insensitivity to parameter variations and disturbances. Simulation results confirm the validity of the methodologies proposed and of the analyses performed
Keywords :
electric current control; electric drives; induction motors; power convertors; railways; reactive power; traction; voltage control; 25 kV; 50 Hz; AC/DC/AC conversion structure; AC/DC/AC high voltage traction drives; control system; high-dynamics responses; high-performance techniques; high-voltage converters; induction motor drives; line side; low distorted line current; lower harmonic content; motor side; multilevel voltage waveforms; parameter variations insensitivity; quasi-unitary power factor; quasi-zero reactive power demand; railways; single-phase traction systems; variable structure system; Analog-digital conversion; Control systems; Electric variables control; Pulse width modulation converters; Pulse width modulation inverters; Reactive power; Switching frequency; Topology; Traction motors; Voltage;
Journal_Title :
Power Electronics, IEEE Transactions on
