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On the Impact of Fault Ride-Through on Transient Stability of Autonomous Microgrids: Nonlinear Analysis and Solution

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Bibliographic Details
Title: On the Impact of Fault Ride-Through on Transient Stability of Autonomous Microgrids: Nonlinear Analysis and Solution
Authors: Eskandari, M, Savkin, AV
Source: IEEE Transactions on Smart Grid. 12:999-1010
Publisher Information: Institute of Electrical and Electronics Engineers (IEEE), 2021.
Publication Year: 2021
Subject Terms: anzsrc-for: 4009 Electronics, anzsrc-for: 4606 Distributed computing and systems software, 02 engineering and technology, anzsrc-for: 40 Engineering, 4009 Electronics, anzsrc-for: 0915 Interdisciplinary Engineering, 0202 electrical engineering, electronic engineering, information engineering, 4008 Electrical Engineering, Sensors and Digital Hardware, anzsrc-for: 4008 Electrical Engineering, anzsrc-for: 0906 Electrical and Electronic Engineering, 40 Engineering
Description: Fault ride-through (FRT) is essential for inverter-interfaced distributed generation (IIDG) units to protect semiconductor switches from being imposed to overcurrent conditions while the transients are securely passed. To this end, a current limiting strategy is adopted for IIDG units, mostly embedded in control loops, to limit the current within the withstand-able band and to make the IIDG units stay connected to the (micro) grid during the transient. However, the FRT/current limiting of grid-forming inverters affects the transient stability of the autonomous droop-based microgrids and may make them unstable, which yet has not been well-explored in the literature. This issue is considered in this work through a scrupulous observation of the second-order nonlinear differential equation describing the frequency-phase angle dynamics and investigating the problem through the Lyapunov theory. The Chetaev’s instability theorem, which is developed based on the Lyapunov direct method, is used to explore the instability conditions due to the FRT. It is revealed that the phase angle variation, as a consequence of the current limiting, and the arbitrary/resistive transient impedance of grid-forming inverters make the system unstable. Numerical and time-domain results through MATLAB/Simulink platform prove the validity of the models.
Document Type: Article
File Description: application/pdf
ISSN: 1949-3061
1949-3053
DOI: 10.1109/tsg.2020.3030015
Access URL: https://ieeexplore.ieee.org/document/9220790/
https://dblp.uni-trier.de/db/journals/tsg/tsg12.html#EskandariS21
Rights: IEEE Copyright
CC BY NC ND
Accession Number: edsair.doi.dedup.....5fb95e0f2034cbba1b3a5ed60e71b05a
Database: OpenAIRE
Description
Abstract:Fault ride-through (FRT) is essential for inverter-interfaced distributed generation (IIDG) units to protect semiconductor switches from being imposed to overcurrent conditions while the transients are securely passed. To this end, a current limiting strategy is adopted for IIDG units, mostly embedded in control loops, to limit the current within the withstand-able band and to make the IIDG units stay connected to the (micro) grid during the transient. However, the FRT/current limiting of grid-forming inverters affects the transient stability of the autonomous droop-based microgrids and may make them unstable, which yet has not been well-explored in the literature. This issue is considered in this work through a scrupulous observation of the second-order nonlinear differential equation describing the frequency-phase angle dynamics and investigating the problem through the Lyapunov theory. The Chetaev’s instability theorem, which is developed based on the Lyapunov direct method, is used to explore the instability conditions due to the FRT. It is revealed that the phase angle variation, as a consequence of the current limiting, and the arbitrary/resistive transient impedance of grid-forming inverters make the system unstable. Numerical and time-domain results through MATLAB/Simulink platform prove the validity of the models.
ISSN:19493061
19493053
DOI:10.1109/tsg.2020.3030015