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Transformerless series sag compensation with a cascaded multilevel inverter

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3 Author(s)
Visser, A.J. ; Dept. of Electr. & Electron. Eng., Stellenbosch Univ., South Africa ; Enslin, J.H.R. ; de T Mouton, H.

The use of a cascaded multilevel inverter for transformerless sag/dip compensation is investigated. This topology is investigated as a cost-effective means for series sag compensation by eliminating the large injection transformer and output filter components that are used in conventional series injection devices. This prototype inverter is designed for sag compensation of a 250-kVA load. In this design, cost effectiveness plays a major role in the selection of the energy storage and the switching components. Control schemes are discussed for series sag compensation with this multilevel inverter. New control methods for sag compensation and injection are also introduced. A prototype is developed and the control schemes of this sag compensator are successfully verified in the practical results and show successful compensation for sags for different types of loads. The performance of this compensator makes it promising for future power rating upgrade and industrialization.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:49 ,  Issue: 4 )

Date of Publication:

Aug 2002

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