The converter on the low voltage side of a Smart Transformer often has to supply unbalanced loads. The consequent neutral current flows through the DC link electrolytic capackors in a DC-split configuration and hence represents the main cause of their overheating and of their premature failure. Since this kind of unbalanced operation is a very frequent condition to be faced, one way to extend the capacitor lifetime and the system reliability is to limit the neutral current through a zero-sequence current control. Nevertheless, this technique produces a large deviation of the PCC voltages, which no longer meet the limits set by the standards. To this purpose, the present paper proposes a zero-sequence injection technique that can achieve the best trade-off between the capacitor lifetime extension and the quality of the voltages at the PCC.

Zero-sequence injection technique for capacitor lifetime extension on the low-voltage converter of a smart transformer / Zhu, Rongwu; Monopoli, Vito Giuseppe; Liserre, Marco. - ELETTRONICO. - (2018), pp. 8591595.4415-8591595.4420. (Intervento presentato al convegno 44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018 tenutosi a Washington, DC nel October 21-23, 2018) [10.1109/IECON.2018.8591595].

Zero-sequence injection technique for capacitor lifetime extension on the low-voltage converter of a smart transformer

Monopoli, Vito Giuseppe;
2018-01-01

Abstract

The converter on the low voltage side of a Smart Transformer often has to supply unbalanced loads. The consequent neutral current flows through the DC link electrolytic capackors in a DC-split configuration and hence represents the main cause of their overheating and of their premature failure. Since this kind of unbalanced operation is a very frequent condition to be faced, one way to extend the capacitor lifetime and the system reliability is to limit the neutral current through a zero-sequence current control. Nevertheless, this technique produces a large deviation of the PCC voltages, which no longer meet the limits set by the standards. To this purpose, the present paper proposes a zero-sequence injection technique that can achieve the best trade-off between the capacitor lifetime extension and the quality of the voltages at the PCC.
2018
44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018
978-1-5090-6684-1
Zero-sequence injection technique for capacitor lifetime extension on the low-voltage converter of a smart transformer / Zhu, Rongwu; Monopoli, Vito Giuseppe; Liserre, Marco. - ELETTRONICO. - (2018), pp. 8591595.4415-8591595.4420. (Intervento presentato al convegno 44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018 tenutosi a Washington, DC nel October 21-23, 2018) [10.1109/IECON.2018.8591595].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/168438
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