TY - GEN
T1 - Zero-sequence injection technique for capacitor lifetime extension on the low-voltage converter of a smart transformer
AU - Zhu, Rongwu
AU - Monopoli, Vito Giuseppe
AU - Liserre, Marco
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/12/26
Y1 - 2018/12/26
N2 - 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.
AB - 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.
KW - Aluminum Electrolytic Capacitor
KW - Smart Transformer
KW - Solid-State Transformer
KW - Unbalanced Load
UR - https://www.scopus.com/pages/publications/85061531088
U2 - 10.1109/IECON.2018.8591595
DO - 10.1109/IECON.2018.8591595
M3 - 会议稿件
AN - SCOPUS:85061531088
T3 - Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
SP - 4415
EP - 4420
BT - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018
Y2 - 20 October 2018 through 23 October 2018
ER -