Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32809
Title: Effects of interaction of power converters coupled via power grid : a design-oriented study
Authors: Wan, C
Huang, M
Tse, CK 
Ruan, X
Keywords: Grid-connected converters
Interacting systems
Power converters
Stability analysis
Issue Date: 2015
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on power electronics, 2015, v. 30, no. 7, 6881708, p. 3589-3600 How to cite?
Journal: IEEE transactions on power electronics 
Abstract: Voltage-source converters are commonly employed as rectifiers for providing a regulated dc voltage from an ac power source. In a typical microdistribution system, the power grid is nonideal and often presents itself as a voltage source with significant impedance. Thus, power converters connected to the grid interact with each other via the nonideal grid. In this paper, we study how stability can be compromised in a system of interacting grid-connected converters, which are used typically as rectifiers. Specifically, the stable operating regions in the selected parameter space may shrink when grid-connected converters interact under certain conditions. We consider the effect of both source (grid) impedance and transmission line impedance between converters, and derive bifurcation boundaries in the parameter space. A small-signal model in the dq-frame is adopted to analyze the interacting system using an impedance-based approach. It is shown that the system of interacting converters can become unstable. Moreover, results are presented in design-oriented forms so as to facilitate the identification of variation trends of stable operation boundaries. Experimental results verify the instability phenomenon.
URI: http://hdl.handle.net/10397/32809
ISSN: 0885-8993
EISSN: 1941-0107
DOI: 10.1109/TPEL.2014.2349936
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