| REDUCTION OF HARMONIC CURRENTS GENERATED BY PARALLEL CONNECTED ELECTRIC TRACTION RECTIFIERS | ||||||
| Author(s) | E. Destobbeleer; J. P. Hautier | |||||
| Abstract | Harmonic current perturbations generated by electric locomotive rectifiers must be kept within strict limits particularly defined by the "equivalent disturbing current" led. The series or parallel connection of these rectifiers allow phase shifts between their controls. Three different controls of two to four, parallel connected, P.W.M. four quadrant choppers are theoretically studied. The P.W.M. consists in a triangular carrier intersecting a sinusoidal modulating wave the
harmonic content of the drawn current is spread among "families". The three control methods are: • Global phase shift of the input voltage of the rectifiers, • Phase shift of the triangular carrier of each rectifiers, • Combination of the two preceeding methods. The actions of the three control methods on the total harmonic current families and on the led are studied. |
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| Type | Members Only | |||||
| Date | Last modified 2019-08-12 by System | |||||
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