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Supply and loading quality improvement in sinusoidal power systems with unbalanced loads supplied with asymmetrical voltage

Verbesserung der Versorgungsqualität bei dreiphasigen Energiesystemen mit unsymmetrischer Belastung und unsymmetrischer Spannung

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Contents

Asymmetry of the supply voltage of a load and variation of its RMS value deteriorate supply quality, similarly as asymmetry of the load current, its reactive component, and variation of the current RMS value deteriorate loading quality. A method for adaptively improving the supply and loading quality with respect to the load unbalance and the voltage asymmetry is suggested and analyzed in this paper. The discussed method can be implemented for the development of an adaptive compensator for both the load balancing and supply voltage symmetrization. It was shown, moreover, that only three samples per periodT of two voltages and two currents are needed for generating the control signals for the adaptive operation of such a compensator.

Übersicht

Eine unsymmetrische Versorgungsspannung stört die Versorgungsqualität ähnlich wie ein unsymmetrischer Laststrom. In diesem Beitrag wird ein Verfahren zur adaptiven Verbesserung der Versorgungsqualität bezüglich Unsymmetrien der speisenden Spannung und der Lastschaltung vorgeschlagen und analysiert. Das Verfahren kann für die Entwicklung eines adaptiven Kompensators verwendet werden, der sowohl die Last als auch die Klemmenspannung symmetriert. Außerdem wird gezeigt, daß nur 3 Abtast-werte pro Periode bei je 2 Spannungen und Strömen ausreichen, um die Steuersignale für den adaptiven Betrieb eines solchen Kompensators zu erzeugen.

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Czarnecki, L.S. Supply and loading quality improvement in sinusoidal power systems with unbalanced loads supplied with asymmetrical voltage. Archiv f. Elektrotechnik 77, 169–177 (1994). https://doi.org/10.1007/BF01573892

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