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Title: Stability improvement for three-phase grid-connected converters through impedance reshaping in quadrature-axis
Authors: Fang, Jingyang
Li, Xiaoqiang
Li, Hongchang
Tang, Yi
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2017
Source: Fang, J., Li, X., Li H., & Tang, Y. (2018). Stability improvement for three-phase grid-connected converters through impedance reshaping in quadrature-axis. IEEE Transactions on Power Electronics, 33(10), 8365 - 8375. doi:10.1109/TPEL.2017.2777972
Journal: IEEE Transactions on Power Electronics 
Abstract: Three-phase AC-DC and DC-AC power converters have been extensively employed as grid-interfaces in various applications, e.g., distributed generation and energy storage systems. In these applications, power converters should always synchronize with the mains grid so that active and/or reactive power can properly be regulated while maintaining desired waveforms of grid currents. Grid synchronization necessitates accurate information of grid voltages, which is normally obtained through phase-locked-loops (PLLs). However, the employment of PLLs may bring in stability concerns. Previous research revealed that the inclusion of PLLs shapes the impedance of power converters into a negative resistance in the quadrature-axis (q-axis), and this should be responsible for instability. To resolve the instability issue caused by PLLs, this paper proposes an impedance controller for reshaping the q-axis impedance into a positive resistance in the low-frequency band. Without any extra burden on system hardware, the proposed controller can easily be implemented by directly relating the q-axis voltage to the q-axis current reference. As a result, the presented three-phase power conversion system can operate stably even under a severely weak grid condition, which are verified by simulation and experimental results.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2017.2777972
Rights: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
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