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A four-leg buck inverter for three-phase four-wire systems with the function of reducing DC-bus ripples

Yang, Peng, Ming, Wenlong, Liang, Jun and Wu, Jianzhong 2019. A four-leg buck inverter for three-phase four-wire systems with the function of reducing DC-bus ripples. 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. 1508-1513. 10.1109/IECON.2019.8927264

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Abstract

Three-phase four-wire inverters are usually used to feed unbalanced three-phase loads with neutral currents. The unbalanced three-phase loads also bring to second-order ripples in the DC bus, which should be mitigated by bulky DC-bus capacitors to improve the system performance. In this case, the DC capacitance is designed for the second-order ripple frequency instead of the switching frequency, so it can not be reduced even when SiC MOSFETs are adopted to achieve high switching frequency. Although various topologies of three-phase four-wire inverters has been proposed to provide the path for neutral currents, they cannot handle the second-order ripples. Also, some active power decoupling solutions can be adopted, but they require additional active swithes and components, which increases the cost of the system. In this paper, a four-leg buck inverter is proposed, which consists of four DC-DC buck converters. Each buck converter is independently controlled. This topology can not only provide neutral currents, but also reduce the second-order ripples in the DC bus with active power decoupling control. The proposed topology doesn't require any additional active switches comparing to the conventional topologies with neutral legs. The effectiveness of proposed topology is verified by the simulation in MATLAB/Simulink.

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 15:25
URI: http://orca-mwe.cf.ac.uk/id/eprint/131659

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