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EPE Journal Volume 12-1 - Papers
EPE Journal Volume 12-1 - Editorial
By T. Undeland
The Editorial of the EPE Journal Volume 12 N°1, "A Letter from America", written by Prof. Tore Undeland, EPE Association.
EPE Journal Volume 12-1 - Papers
By E. G. Shivakumar; K. Gopakumar; S. K. Sinha; A. Pittet; V. T. Ranganathan
The technique of space vector PWM control of dual voltage source inverter fed three phase open-end winding induction motor is presented in this paper. A space vector PWM technique is developed based on the combination of space vectors from dual inverters feeding the induction motor from both ends (open-end winding without neutral point). A total of 64 voltage space vector combinations are available for PWM voltage control of the inverter fed machine with open-end winding. A space phasor based PWM scheme is proposed with minimum number of switching in a cycle per inverter coupled with equal number of switching for each inverter. All the voltage space vector combinations are utilized for generating the reference voltage vector to cover the entire speed range. The open-end winding structure can have significant third harmonic currents unless suitable third harmonic filters are used to suppress it. The third harmonic currents are suppressed by using isolated transformers for both inverters.
By J. Svensson; A. Sannino
In this paper, a static series compensator for voltage sag mitigation is completed with a voltage active filtering function for further power quality improvement. The control system developed here performs isolation of voltage harmonics in several rotating coordinate systems, thus being able to cancel (or reduce) only selected harmonics, if desired. Moreover, it compensates for the effect of the converter output filter, which is frequency-dependant. Simulated results confirm the capability of the device to cancel symmetrical and unsymmetrical harmonics. Moreover, it is shown by using actual voltage sag recordings that the addition of the active filtering feature does not affect the speed of response during transients.
By C. Turpin; F. Richardeau; T. Meynard; F. Forest
To test and to characterise in terms of losses high power converters is never easy because loads and input sources adapted to the commutated power are necessary. In this paper, the authors propose to study the opposition method which avoids this problem. It offers a very good accuracy for measurement of losses. Its principle and its main properties are presented. The calculations of the theoretical losses in the opposition method are shown. Moreover a method to choose the smoothing inductor, a crucial point, is proposed. This method is applied to the multicell multilevel inverters: two identical 1800V-200A-16kHz hard switched 3-cell/4-level inverter legs are opposed.