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Small-signal stability and robustness analysis for microgrids under time-constrained DoS attacks and a mitigation adaptive secondary control method

Small-signal stability and robustness analysis for microgrids under time-constrained DoS attacks and a mitigation adaptive secondary control method
Small-signal stability and robustness analysis for microgrids under time-constrained DoS attacks and a mitigation adaptive secondary control method
With the close integration of cyber and power systems, the consensus-based secondary frequency control in a microgrid is increasingly vulnerable to communication failures such as transmission delays and denial-of-service (DoS) attacks, which can affect the efficiency of frequency recovery in the secondary frequency control. Leveraging the small-signal model, this paper develops a novel cyber-physical system model to analyze the cross-layer effect of DoS attacks on microgrids. In this way, the cross-layer impact on the microgrid from the cyber system to the physical system can be convincingly analyzed. Based on the root approximation method, the tolerant saving time is designed for the microgrid as the index to evaluate the tolerance margin of the time-constrained DoS attack, and then the relationship between the margin and secondary control coefficients is found. A mitigation adaptive secondary control technique is proposed so that the attacked microgrid can dynamically tune the secondary control gain according to the saving time and tolerant saving time (TST). The simulation results show that although the microgrid with high secondary control gain has good dynamic robustness, its TST is low. In addition, the proposed adaptive secondary control system is significantly better than the traditional control system in terms of the stability performance of the microgrid under a DoS attack.
adaptive secondary frequency control, cyber-physical system security, denial-of-service attack, hierarchical control architecture, microgrid
1674-733X
Sun, Qiuye
0db411bb-ed6d-4db4-b91e-a92b38fdcd89
Wang, Bingyu
6e40f3bf-da6d-4f2c-8581-4fd019dc46c3
Feng, Xiaomeng
22a65b28-6daa-4cd4-8cad-4608c412aa08
Hu, Shiyan
19bb09b2-bf52-4bd7-818a-63e8da474072
Sun, Qiuye
0db411bb-ed6d-4db4-b91e-a92b38fdcd89
Wang, Bingyu
6e40f3bf-da6d-4f2c-8581-4fd019dc46c3
Feng, Xiaomeng
22a65b28-6daa-4cd4-8cad-4608c412aa08
Hu, Shiyan
19bb09b2-bf52-4bd7-818a-63e8da474072

Sun, Qiuye, Wang, Bingyu, Feng, Xiaomeng and Hu, Shiyan (2022) Small-signal stability and robustness analysis for microgrids under time-constrained DoS attacks and a mitigation adaptive secondary control method. Science China Information Sciences, 65 (6), [162202]. (doi:10.1007/s11432-021-3290-3).

Record type: Article

Abstract

With the close integration of cyber and power systems, the consensus-based secondary frequency control in a microgrid is increasingly vulnerable to communication failures such as transmission delays and denial-of-service (DoS) attacks, which can affect the efficiency of frequency recovery in the secondary frequency control. Leveraging the small-signal model, this paper develops a novel cyber-physical system model to analyze the cross-layer effect of DoS attacks on microgrids. In this way, the cross-layer impact on the microgrid from the cyber system to the physical system can be convincingly analyzed. Based on the root approximation method, the tolerant saving time is designed for the microgrid as the index to evaluate the tolerance margin of the time-constrained DoS attack, and then the relationship between the margin and secondary control coefficients is found. A mitigation adaptive secondary control technique is proposed so that the attacked microgrid can dynamically tune the secondary control gain according to the saving time and tolerant saving time (TST). The simulation results show that although the microgrid with high secondary control gain has good dynamic robustness, its TST is low. In addition, the proposed adaptive secondary control system is significantly better than the traditional control system in terms of the stability performance of the microgrid under a DoS attack.

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Small-signal Stability and Robustness Analysis - Accepted Manuscript
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More information

Accepted/In Press date: 2 June 2021
e-pub ahead of print date: 26 April 2022
Published date: June 2022
Additional Information: Funding Information: This work was supported by National Key Research and Development Program of China (Grant No. 2018YFA0702200) and National Natural Science Key Foundation of China (Grant No. U20A20190). Publisher Copyright: © 2022, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Keywords: adaptive secondary frequency control, cyber-physical system security, denial-of-service attack, hierarchical control architecture, microgrid

Identifiers

Local EPrints ID: 467930
URI: http://eprints.soton.ac.uk/id/eprint/467930
ISSN: 1674-733X
PURE UUID: b76ec8d3-b833-47e3-a866-4c27a5b5b480

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Date deposited: 26 Jul 2022 16:34
Last modified: 06 Jun 2024 04:03

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Contributors

Author: Qiuye Sun
Author: Bingyu Wang
Author: Xiaomeng Feng
Author: Shiyan Hu

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