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Energies 2018, 11(3), 502; https://doi.org/10.3390/en11030502

Active Stabilization Control of Multi-Terminal AC/DC Hybrid System Based on Flexible Low-Voltage DC Power Distribution

1,2
,
1,2,* and 1,2
1
Institute of Electrical Engineering, Chinese Academy of Sciences, No. 6 Beiertiao, Zhongguancun, Beijing 100190, China
2
The School of Electronic, Electrical and Communication Engineering (EECE), University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Shijingshan District, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 28 December 2017 / Revised: 22 January 2018 / Accepted: 31 January 2018 / Published: 27 February 2018
(This article belongs to the Special Issue DC Systems)
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Abstract

Multi-terminal AC/DC interconnection will be an important form of future distribution networks. In a multi-terminal AC/DC system, if scheduled power for the AC/DC converter exceeds limits this may result in instability of the DC network. In order to overcome these limitations and avoid an unstable situation during coordinated control, this paper proposes a general active stabilization method for a low-voltage multi-terminal AC/DC hybrid system. First, the typical coordinated control modes for a hybrid system are analyzed. Second, a multi-level active stabilization controller, using the Lyapunov method, is introduced, and a feedback law allowing large signal stability is proposed. Finally, a system simulation model is further established, and the proposed active stabilization method is tested and verified. Study results show that only low stabilizing power with a slight influence on the DC network dynamic can improve the system’s stability and ensure stable system voltage. View Full-Text
Keywords: multi-terminal AC/DC; coordinated control; flexible DC; stability; active stabilization multi-terminal AC/DC; coordinated control; flexible DC; stability; active stabilization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Deng, W.; Pei, W.; Li, L. Active Stabilization Control of Multi-Terminal AC/DC Hybrid System Based on Flexible Low-Voltage DC Power Distribution. Energies 2018, 11, 502.

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