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Energies 2015, 8(3), 1606-1627; doi:10.3390/en8031606

Design of a Four-Branch LCL-Type Grid-Connecting Interface for a Three-Phase, Four-Leg Active Power Filter

School of Electrical Engineering, Southeast University, No 2 Si Pai Lou, Nanjing 210096, China
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Academic Editor: Frede Blaabjerg
Received: 6 January 2015 / Revised: 15 February 2015 / Accepted: 16 February 2015 / Published: 27 February 2015
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Abstract

Compared with the three-phase, two-split-capacitor active power filter (3P2C-APF), the three-phase, four-leg active power filter (3P4L-APF) has been widely used in three-phase, four-wire grid utility for power quality control due to its numerous advantages, such as higher current output capability, particularly in phase N, lower current and easier voltage control on the DC-side. However, designing the grid-connecting interface, which is between the voltage source converter (VSC) and grid utility, is rather difficult due to the higher requirement for current ripple filtering in phase N, cross-coupling in four phases and lack of relevant design methodology and specification. In this paper, a four-branch LCL-type (4B-LCL) grid-connecting interface is proposed for 3P4L-APF, which features better current ripple filtering performance without decreasing the current output capability in all phases. First, this paper describes the mathematical models of 4B-LCL in the fully-complex-vector form from the zero and non-zero sequence perspective, resulting in two independent and uniform equivalent circuits without cross coupling terms. Then, the 4B-LCL parameter design method based on the most comprehensive performance index is proposed, including three main stages as the specification: performance index requirement determination, fulfillment of that requirement, and verification. Finally, the validity and effectiveness of the proposed design are proven by the simulated and experimental results of a 3P4L-APF with 4B-LCL. View Full-Text
Keywords: three-phase four-leg (3P4L); four-branch LCL (4B-LCL); grid-connecting; active power filter (APF); power quality (PQ); pulse-width-modulated (PWM) converter three-phase four-leg (3P4L); four-branch LCL (4B-LCL); grid-connecting; active power filter (APF); power quality (PQ); pulse-width-modulated (PWM) converter
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cao, W.; Liu, K.; Ji, Y.; Wang, Y.; Zhao, J. Design of a Four-Branch LCL-Type Grid-Connecting Interface for a Three-Phase, Four-Leg Active Power Filter. Energies 2015, 8, 1606-1627.

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