Enhancing Frequency Stability of Weak Grids with Modified Distributed Virtual Inertia Method

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Journal Title
Journal ISSN
Volume Title
Conference article in proceedings
Date
2020
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
187-192
Series
Proceedings of the 11th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2020, IEEE International Symposium on Power Electronics for Distributed Generation Systems
Abstract
In small–scale power systems, distributed virtual inertia (DVI)–based converters can effectively participate in primary frequency regulation. In this method, the synthetic inertia provision is fulfilled by discharging the preserved energy of dc–side capacitors employed in grid–interactive converters. Nevertheless, the eigenvalue analyses provided by small–signal state–space model of the converter reveal that the DVI function induces instability to the converter operating in weak grid connection. To address this issue aimed at improving grid frequency stability during frequency events, a new compensator is presented in this work. The compensator is designed so as eliminates the negative effect of DVI regulator on system stability. The effectiveness of proposed approach is illustrated by the time–domain simulations in MATLAB. The results show that the frequency rate of change following a frequency perturbation is enhanced by 40.38% compared with the scenario in which the synthetic inertia functionality is nullified.
Description
Keywords
Grid - following voltage source converter, VSC, Synthetic inertia, Frequency regulation, renewable energy source, RES
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Citation
Saeedian, M, Pournazarian, B, Eskandari, B, Shahparasti, M & Pouresmaeil, E 2020, Enhancing Frequency Stability of Weak Grids with Modified Distributed Virtual Inertia Method . in Proceedings of the 11th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2020 ., 9244475, IEEE International Symposium on Power Electronics for Distributed Generation Systems, IEEE, pp. 187-192, IEEE International Symposium on Power Electronics for Distributed Generation Systems, Virtual, Online, 28/09/2020 . https://doi.org/10.1109/PEDG48541.2020.9244475