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Article

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

Faculty of Information Technology and Communication Sciences, Tampere University, 33720 Tampere, Finland
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Author to whom correspondence should be addressed.
Energies 2020, 13(8), 2109; https://doi.org/10.3390/en13082109
Received: 20 March 2020 / Revised: 17 April 2020 / Accepted: 17 April 2020 / Published: 24 April 2020
(This article belongs to the Special Issue Power Electronics in Renewable Energy Systems Ⅱ)
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. View Full-Text
Keywords: grid-connected power electronics; stability analysis; impedance-based stability criterion; system instability; case study grid-connected power electronics; stability analysis; impedance-based stability criterion; system instability; case study
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MDPI and ACS Style

Alenius, H.; Roinila, T. Impedance-Based Stability Analysis of Paralleled Grid-Connected Rectifiers: Experimental Case Study in a Data Center. Energies 2020, 13, 2109. https://doi.org/10.3390/en13082109

AMA Style

Alenius H, Roinila T. Impedance-Based Stability Analysis of Paralleled Grid-Connected Rectifiers: Experimental Case Study in a Data Center. Energies. 2020; 13(8):2109. https://doi.org/10.3390/en13082109

Chicago/Turabian Style

Alenius, Henrik, and Tomi Roinila. 2020. "Impedance-Based Stability Analysis of Paralleled Grid-Connected Rectifiers: Experimental Case Study in a Data Center" Energies 13, no. 8: 2109. https://doi.org/10.3390/en13082109

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