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Increasing voltage utilization in split-link, four-wire inverters

Liang, Jun, Green, T. C., Feng, C. M. and Weiss, G. 2009. Increasing voltage utilization in split-link, four-wire inverters. IEEE Transactions on Power Electronics 24 (6) , pp. 1562-1569. 10.1109/TPEL.2009.2013351

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Three-phase four-wire inverters, with either three-leg or four-leg topology, are useful for interfacing distributed generation to networks of unbalanced loads, but neither of the available circuit topologies is ideal. The split-link three-leg topology (with six switches) suffers from poor DC voltage utilization compared with the four-leg topology (with eight switches). The four-leg topology has an electromagnetic compatibility (EMC) difficulty because it imposes large-amplitude high-frequency voltages between the DC-link busbars and ground. To obtain both good dc voltage utilization and good EMC performance, it is proposed to use a split-link inverter with an active balancing circuit (also eight switches). The balancing circuit is used to modulate the DC busbar offset voltage to make better use of the available DC-link voltage. The optimum voltage term is established to be a third harmonic term, and the DC voltage utilization is improved. A deadbeat controller supplemented with a repetitive controller is designed to give good tracking and good disturbance rejection for the busbar offset voltage. System performance is studied through an experimental test rig.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: Busbar offset modulation; dc link; four-wire inverter; repetitive control; voltage utilization
Publisher: IEEE
ISSN: 0885-8993
Last Modified: 04 Jun 2017 02:03

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