This paper deals with a novel hybrid transformer configuration able to face power quality issues occurring on modern distribution grids integrating distributed generation from renewable energy sources and non-linear power electronic loads. The proposed system encompasses a three-phase distribution transformer with secondary windings arranged according to an open-end configuration and a three-phase inverter with floating DC bus. Unlike previous hybrid transformers the proposed one does not require a bidirectional converter to manage bidirectional power flows, neither a tertiary winding to supply the inverter, thus allowing the use of standard MV-LV distribution transformers with simple modifications. The obtained power conversion system can be exploited to perform a voltage control at the distribution grid edge, a reactive power management and harmonic pollution mitigation. Simulations confirm the effectiveness of the proposed solution, ensuring high power quality voltage control under unbalanced grid and load conditions.

An open-end winding hybrid transformer

Tornello L. D.;Scelba G.;Cacciato M.
2020-01-01

Abstract

This paper deals with a novel hybrid transformer configuration able to face power quality issues occurring on modern distribution grids integrating distributed generation from renewable energy sources and non-linear power electronic loads. The proposed system encompasses a three-phase distribution transformer with secondary windings arranged according to an open-end configuration and a three-phase inverter with floating DC bus. Unlike previous hybrid transformers the proposed one does not require a bidirectional converter to manage bidirectional power flows, neither a tertiary winding to supply the inverter, thus allowing the use of standard MV-LV distribution transformers with simple modifications. The obtained power conversion system can be exploited to perform a voltage control at the distribution grid edge, a reactive power management and harmonic pollution mitigation. Simulations confirm the effectiveness of the proposed solution, ensuring high power quality voltage control under unbalanced grid and load conditions.
2020
978-1-7281-7019-0
Distribution Transformer
Grid voltage control
Hybrid Transformer
Open-end Winding
Power Quality
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/500460
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