Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 58, Issue 6, Pages 7620-7633Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2022.3199711
Keywords
Distributed generators (DGs); microgrids (MGs); nonlinear droop control; small-signal stability
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This article analyzes the effects of nonlinear droop relations on the stability of an inverter-based microgrid and develops a small-signal state-space linearized model to analyze the stability. The results are experimentally verified to demonstrate the effectiveness.
Nonlinear droop control has been introduced to establish an effective power-sharing between distributed generators without the need for communication links in microgrids (MGs). However, one of the missing studies in the literature is the effects of nonlinear droop relations on the stability of the MGs. In this article, the stability of an inverter-based MG operating with the nonlinear frequency droop-control has been analyzed. A complete small-signal state-space linearized model of the MG system, with optimized nonlinear droop relations, has been developed considering the dynamics of the overall system and is updated periodically. The stability of the system is then checked online at different operating points. Small-signal stability analysis of an islanded MG was performed using MATLAB/Simulink and the results were experimentally verified on an MG setup.
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