Stability of interacting grid-connected power converters

doi:10.1007/s40565-013-0034-y

Home > Archive>Volume 1, Issue 3, 2013 >249-257. DOI:10.1007/s40565-013-0034-y

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Stability of interacting grid-connected power converters

DOI:

10.1007/s40565-013-0034-y

Author:

Cheng WAN
Cheng WAN
1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, China 2.Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Hong Kong, China
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Meng HUANG
Meng HUANG
2.Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Hong Kong, China 3.School of Electronic Engineering, Wuhan University, Wuhan, China
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Chi K. TSE
Chi K. TSE
Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Hong Kong, China
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Xinbo RUAN
Xinbo RUAN
College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
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Affiliation:

1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, China 2. Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Hong Kong, China 3. School of Electronic Engineering, Wuhan University, Wuhan, China 4. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China

Fund Project:

Hong Kong Polytechnic University Grants G-U866 and G-YJ32.

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Abstract:

The power grid in a typical micro distribution system is non-ideal, presenting itself as a voltage source with significant impedance. Thus, grid-connected convertersinteract with each other via the non-ideal grid. In this study, we consider the practical scenario of voltage-source converters connected to a three-phase voltage source with significant impedance. We show that stability can becompromised in the interacting converters. Specifically, the stable operating regions in selected parameter space maybe reduced when grid-connected converters interact undercertain conditions. In this paper, we develop bifurcationboundaries in the parameter space with respect to Hopftypeinstability. A small-signal model in the dq-frame isadopted to analyze the system using an impedance-based approach. Moreover, results are presented in design-orientedforms so as to facilitate the identification of variation trends of the parameter ranges that guarantee stable operation.

Key words:Power converters, Stability analysis,Interacting systems, Grid-connected converters

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Online: May 22,2015
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