DC-Link Voltage Balance Control in Three-phase Four-wire Active Power Filters

Yu Wang; Yuanpeng Guan; Yunxiang Xie; Xiang Liu

DC-Link Voltage Balance Control in Three-phase Four-wire Active Power Filters

Vol. 16, No. 5, pp. 1928-1938, Sep. 2016

10.6113/JPE.2016.16.5.1928

Active power filter

DC-link voltage balance

Voltage control strategy

Compensation performance

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Abstract

The three-phase four-wire shunt active power filter (APF) is an effective method to solve the harmonic problem in three-phase four-wire power systems. In addition, it has two possible topologies, a four-leg inverter and a three-leg inverter with a split-capacitor. There are some studies investigating DC-link voltage control in three-phase four-wire APFs. However, when compared to the four-leg inverter topology, maintaining the balance between the DC-link upper and lower capacitor voltages becomes a unique problem in the three-leg inverter with a split-capacitor topology, and previous studies seldom pay attention to this fact. In this paper, the influence of the balance between the two DC-link voltages on the compensation performance, and the influence of the voltage balance controller on the compensation performance, are analyzed. To achieve the balance between the two DC-link capacitor voltages, and to avoid the adverse effect the voltage balance controller has on the APF compensation performance, a new DC-link voltage balance control strategy for the three-phase four-wire split-capacitor APF is proposed. Representative simulation and experimental results are presented to verify the analysis and the proposed DC-link voltage balance control strategy.

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Cite this article

[IEEE Style]

Y. Wang, Y. Guan, Y. Xie, X. Liu, "DC-Link Voltage Balance Control in Three-phase Four-wire Active Power Filters," Journal of Power Electronics, vol. 16, no. 5, pp. 1928-1938, 2016. DOI: 10.6113/JPE.2016.16.5.1928.

[ACM Style]

Yu Wang, Yuanpeng Guan, Yunxiang Xie, and Xiang Liu. 2016. DC-Link Voltage Balance Control in Three-phase Four-wire Active Power Filters. Journal of Power Electronics, 16, 5, (2016), 1928-1938. DOI: 10.6113/JPE.2016.16.5.1928.