Distributed security secondary control for cyber-physical microgrids systems under network DoS attacks

Abstract

This paper considers the frequency regulation and power-sharing problems for cyber-physical microgrids (MGs) under network denial-of-service (DoS) attacks and time-varying communication delays. Compared to conventional distributed controllers based on a system model with ideal communication, a distributed security control protocol is designed. Benefiting from the developed security control method, the adverse effects of network DoS attacks and communication delays can be resisted. Then, a sufficient condition, which is used to achieve the achieve frequency restoration and power-sharing, is established according to the frequency and duration of DoS attacks. By using the average dwell time method and the Lyapunov stability theory, it is theoretically proved that the proposed control scheme can guarantee the stability of the overall AC microgrid system. In order to illustrate the proposed scheme, simulation studies are carried out based on an islanded AC microgrid system with four distributed generators (DGs) built in the simulation. The results do show its effectiveness and also verify the established theoretical results.

Keywords:

• Distributed security control
• network DoS attacks
• cyber-physical microgrids
• frequency regulation
• power sharing

Disclosure statement

No potential conflict of interest was reported by the author(s).

Notes

1 The design conditions of controller gains $k_{\omega }$ and $k_{{}_P}$ are given in Theorems 1 and 2, respectively. From the design conditions in Theorems 1 and 2, it can be seen that the controller gains can be designed separately.

Additional information

Notes on contributors

Zhijie Lian

Zhijie Lian received the B.Eng. degree in electrical engineering and automation from Huazhong University of Science and Technology, Wuhan, China, in 2017 and the M.Sc. degree in electrical engineering from National University of Singapore, Singapore, in 2018. She is currently working on the control and optimization of energy systems toward the Ph.D. degree in the Energy Research Institute, Interdisciplinary Graduate Programme, Nanyang Technological University, Singapore. Her research interests include distributed control, microgrid and smart grid.

Chao Deng

Chao Deng received the Ph.D. degree in control engineering from Northeastern University, China, in 2018. He is currently a Postdoctoral Research Fellow at the School of Electrical and Electronic Engineering in Nanyang Technological University, Singapore. His research interests include distributed fault-tolerant control, event-triggered control, adaptive fuzzy control, secondary control of microgrid, cyber-physical systems.