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Impedance-Based Stability Analysis of Paralleled Grid-Connected Rectifiers: Experimental Case Study in a Data Center

Author

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  • Henrik Alenius

    (Faculty of Information Technology and Communication Sciences, Tampere University, 33720 Tampere, Finland)

  • Tomi Roinila

    (Faculty of Information Technology and Communication Sciences, Tampere University, 33720 Tampere, Finland)

Abstract

Grid-connected systems often consist of several feedback-controlled power-electronics converters that are connected in parallel. Consequently, a number of stability issues arise due to interactions among multiple converter subsystems. Recent studies have presented impedance-based methods to assess the stability of such large systems. However, only few real-life experiences have been previously presented, and practical implementations of impedance-based analysis are rare for large-scale systems that consist of multiple parallel-connected devices. This work presents a case study in which an unstable high-frequency operation, caused by multiple paralleled grid-connected rectifiers, of a 250 kW data center in southern Finland is reported and studied. In addition, the work presents an experimental approach for characterizing and assessing the system stability by using impedance measurements and an aggregated impedance-based analysis. Recently proposed wideband-identification techniques based on binary injection and Fourier methods are applied to obtain the experimental impedance measurements from the input terminals of a single data center rectifier unit. This work provides a practical approach to design and implement the impedance-based stability analysis for a system consisting of multiple paralleled grid-connected converters. It is shown that the applied methods effectively predict the overall system stability and the resonant modes of the system, even with very limited information on the system. The applied methods are versatile, and can be utilized in various grid-connected applications, for example, in adaptive control, system monitoring, and stability analysis.

Suggested Citation

  • Henrik Alenius & Tomi Roinila, 2020. "Impedance-Based Stability Analysis of Paralleled Grid-Connected Rectifiers: Experimental Case Study in a Data Center," Energies, MDPI, vol. 13(8), pages 1-15, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:2109-:d:349749
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    References listed on IDEAS

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    1. Teuvo Suntio & Tuomas Messo & Matias Berg & Henrik Alenius & Tommi Reinikka & Roni Luhtala & Kai Zenger, 2019. "Impedance-Based Interactions in Grid-Tied Three-Phase Inverters in Renewable Energy Applications," Energies, MDPI, vol. 12(3), pages 1-31, January.
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    Cited by:

    1. Weiming Zhang & Hui Fan & Jiangbo Ren & Xianzhi Wang & Tiecheng Li & Yibo Wang, 2022. "A Vector Inspection Technique for Active Distribution Networks Based on Improved Back-to-Back Converters," Sustainability, MDPI, vol. 15(1), pages 1-17, December.
    2. Matthias Buchner & Krzysztof Rudion, 2021. "Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics," Energies, MDPI, vol. 14(21), pages 1-23, November.

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