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An Active Voltage Stabilizer for a DC Microgrid System

Iyer, VM and Gulur, S and Bhattacharya, S and Kikuchi, J and Sridharan, S and Zou, K and Chen, C (2021) An Active Voltage Stabilizer for a DC Microgrid System. In: IEEE Access, 9 . pp. 86786-86800.

iee_9_86786-86800_9456853_2021.pdf - Published Version

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Official URL: https://doi.org/10.1109/ACCESS.2021.3087543


This paper analyzes the low-frequency stability challenges that exist in a complex DC microgrid (MG) system. The converters that belong to a DC MG are categorized into different groups based on their control approach. The small-signal model of the DC MG is presented, and the conditions for system stability are derived. In some DC MG applications, there is the possibility of installing off-the-shelf converters with little flexibility and access for controller auto-tuning. To tackle this, a hardware-based active voltage stabilizer solution is proposed to stabilize the DC MG. The active stabilizer's functionality, based on an isolated bidirectional DC-DC converter, is elucidated, and a suitable control strategy is proposed. The active stabilizer and its associated control configuration involve only local voltage sensing and are non-intrusive. A dual active bridge (DAB) converter-based active stabilizer is implemented, and hardware-based steady-state and transient experimental results from a DC MG test-bench are provided to validate the functionality and effectiveness of the proposed active stabilizer. © 2013 IEEE.

Item Type: Journal Article
Publication: IEEE Access
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright for this article belongs to Authors
Keywords: System stability, Active stabilizer; Active voltage; DC microgrid; Dual active bridge; Dual active bridges; Impedance emulation; Microgrid; Small signal impedances; Small signal model; Stabiliser, DC-DC converters
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 28 Nov 2021 06:37
Last Modified: 28 Nov 2021 06:37
URI: http://eprints.iisc.ac.in/id/eprint/70439

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