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Title: Distributed power system virtual inertia implemented by grid-connected power converters
Authors: Fang, Jingyang
Li, Hongchang
Tang, Yi
Blaabjerg, Frede
Keywords: Frequency Regulation
Power Converter
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2017
Source: Fang, J., Li, H., Tang, Y., & Blaabjerg, F. (2018). Distributed power system virtual inertia implemented by grid-connected power converters. IEEE Transactions on Power Electronics, 33(10), 8488-8499. doi:10.1109/TPEL.2017.2785218
Series/Report no.: IEEE Transactions on Power Electronics
Abstract: Renewable energy sources (RESs), e.g., wind and solar photovoltaics, have been increasingly used to meet worldwide growing energy demands and reduce greenhouse gas emissions. However, RESs are normally coupled to the power grid through fast-response power converters without any inertia, leading to decreased power system inertia. As a result, the grid frequency may easily go beyond the acceptable range under severe frequency events, resulting in undesirable load-shedding, cascading failures, or even large-scale blackouts. To address the ever-decreasing inertia issue, this paper proposes the concept of distributed power system virtual inertia, which can be implemented by grid-connected power converters. Without modifications of system hardware, power system inertia can be emulated by the energy stored in the dc-link capacitors of grid-connected power converters. By regulating the dc-link voltages in proportional to the grid frequency, the dc-link capacitors are aggregated into an extremely large equivalent capacitor serving as an energy buffer for frequency support. Furthermore, the limitation of virtual inertia, together with its design parameters, is identified. Finally, the feasibility of the proposed concept is validated through simulation and experimental results, which indicate that 12.5% and 50% improvements of the frequency nadir and rate of change of frequency can be achieved.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2017.2785218
Rights: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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