A SiC-based neutral leg for the three-phase four-wire inverter

Yang, Peng, Ming, Wenlong, Liang, Jun and Wu, Jianzhong 2019. A SiC-based neutral leg for the three-phase four-wire inverter. Presented at: IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, Lisbon, Portugal, 14-17 October 2019. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. IEEE, pp. 1555-1560. 10.1109/IECON.2019.8927531

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Abstract

SiC-based inverters can operate at high switching frequency with high efficiency, which can reduce the size of passive components and heat sinks to achieve high power density. However, in three-phase four-wire inverters supplying unblanced loads, the second-order ripples in the DC bus need to be mitigated by large DC capacitance, which increases the size of the converter. The conventional neutral leg is widely used in three-phase four-wire inverters to provide neutral currents for the unbalanced loads. In this paper, an improved neutral leg is proposed, which can provide neutral currents and reduce the second-order ripples in the DC bus simultaneously. The DC bus ripples can be reduced without adding any hardware components. Furthermore, the proposed neutral leg can save 50% DC capacitance comparing to the conventional neutral leg. The proposed neutral leg was built with SiC MOSFETs and tested with a three-phase four-wire inverter in the laboratory. The experimental results verified the effectiveness of the proposed neutral leg.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	IEEE
ISBN:	9781728148786
Date of First Compliant Deposit:	20 May 2020
Date of Acceptance:	9 December 2019
Last Modified:	20 May 2020 15:23
URI:	http://orca.cf.ac.uk/id/eprint/131658

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