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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.