This research was funded by Science and technology projects of State Grid Zhejiang Electric Power Co., Ltd. 2021ZK37 (Research on partition coordinated self-healing recovery technology of power system based on artificial intelligence).
Cyber-physical systems (CPSs), as emerging products of industry
4.0
, play a key role in the development of intelligent manufacturing. This paper proposes an observer-based adaptive neural network (NN) control for nonlinear strict-feedback CPSs subject to false data injection attacks. Since there may be strict constraints on the state or output signals of nonlinear cyber-physical systems (NCPSs), we propose a time-varying asymmetric barrier Lyapunov function to realize the specific output constraints of NCPSs under cyber-attacks. Besides, since false data injection attacks will corrupt the transmitted state variables, an observer is designed to obtain observations of the exact states, and NN is used to approximate the unknown nonlinearity of NCPSs. With the proposed control strategy, the constraint control problem of NCPSs subject to false data injection attacks is settled. Finally, a numerical simulation example verifies the effectiveness of the proposed controller.
This article is part of the theme issue ‘Towards symbiotic autonomous systems’.
Mobile emergency resources (MERs) are critical to the resilience of distribution systems for an emergency response to natural disasters. However, after disasters, the communication network of MERs may be unreliable. For example, the communication topology switches in different modes randomly. The conventional centralized control algorithms may not converge. As a result, the instability of frequency and voltage happened. To alleviate the impacts of the unreliable communication network on the second control performance, this paper regards the distribution system after disasters as multiple microgrids. A distributed secondary control algorithm is designed to regulate frequency and voltage in islanded microgrids over switching communication topologies. The algorithm is guaranteed to converge in a fixed time. Case studies are carried out to demonstrate the effectiveness and robustness of the proposed control algorithm under switching communication topologies.INDEX TERMS Mobile emergency resources (MERs), resilience, switching topologies, distributed control.
Till now there is no mature calculation method to II. CALCULATION MODEL AND SOLUTION METHOD OF analyze the passive interference of the high voltage transmission RERADIATION FROM HIGH VOLTAGE OVERHEAD line to the radio station nearby. Based on the production TRANSMISSION LINE mechanism of the reradiation, the paper gives the simplified model of the tower and the transmission line by using equivalentThe metal barriers near radio station's antenna array, way, which make the simulation for the passive interference to including high voltage overhead transmission lines and towers, realize .Finally, it verified the model's enough precision by is considered as the equivalent receiving antenna, and produce comparing it with the shortwave radio direction finding error the secondary induced electromotive force to radio coming experiments data, applicable in designing the protecting distance wave, which will give birth to induced current in the metal between the UHV transmission line and the wireless radio station conductors again. The induced current also will bring nearby in the future. reradiation electromagnetic field around. Due to different
In the paper, we analyze the features of access control of management-type SaaS. Based on the traditional RBAC, we put forward the access control model based on both tenant and role, in which the tenant is as the minimum unit of administrative domain. To be sure user identity with physical security, we put forward the hierarchical authentication and management of user in the management-type SaaS. In order to ensure the access control model of management-type SaaS in line with the reality, we abolish the inheritance right of role in the traditional RBAC. Based on the timing diagram of UML, analyzing the access control model of the cattle public administration platform based on the SaaS, we present its dynamic modeling of access control. Test and analysis is shown that the access control model based on both tenant and role can ensure the accessibility, security and privacy to access cross-domain in the management-type SaaS, and promote the popularization and application of the management-type SaaS.
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