Counteractive control against cyber-attack uncertainties on frequency regulation in the power system

IF 1.7 Q3 COMPUTER SCIENCE, INFORMATION SYSTEMS IET Cyber-Physical Systems: Theory and Applications Pub Date : 2020-11-24 DOI:10.1049/iet-cps.2019.0097
Sheetla Prasad
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引用次数: 11

Abstract

In this study, an observer based control strategy is proposed for load frequency control (LFC) scheme against cyber-attack uncertainties. Most of research work focused on detection scheme or delay estimation scheme in presence of cyber-attack vulnerabilities and paid less attention on design of counteractive robust control scheme for LFC problem. Thus, observer based control scheme is designed here and provides robust performance against unknown input attack uncertainty and communication time-delay attack uncertainty. The generalized extended state observer (GESO) is used not only for state and disturbance estimation but also for disturbance rejection of the system. The said observer ensures accurate estimation of the actual states leading to convergence of estimation error to zero. So, the observer based linear quadratic regulator (LQR) is used to regulate the closed-loop damping ratio against cyber-attack uncertainty. In addition to fast response in terms of settling time and reduced over/undershoots, the proposed control scheme satisfactorily compensates the cyber-attack uncertainties in power system cyber physical networks and also compared with existing traditional PI and PID controllers. The simulation results demonstrate the robustness in terms of stability and effectiveness in terms of system security with proposed controller when subjected to cyber-attack uncertainties and load disturbances.

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电网频率调节中网络攻击不确定性的反主动控制
针对网络攻击的不确定性,提出了一种基于观测器的负载频率控制策略。大多数研究工作都集中在存在网络攻击漏洞的检测方案或延迟估计方案上,而很少关注LFC问题的反主动鲁棒控制方案的设计。因此,本文设计了基于观测器的控制方案,对未知输入攻击的不确定性和通信时延攻击的不确定性具有鲁棒性。广义扩展状态观测器(GESO)不仅用于系统的状态估计和扰动估计,而且用于系统的扰动抑制。所述观测器确保了对实际状态的准确估计,从而使估计误差收敛到零。因此,采用基于观测器的线性二次型调节器(LQR)来调节闭环阻尼比以应对网络攻击的不确定性。该控制方案不仅在稳定时间上响应速度快,而且在过欠冲量上减少,还能较好地补偿电力系统网络物理网络中网络攻击的不确定性,并与现有的传统PI和PID控制器进行了比较。仿真结果表明,该控制器在面对网络攻击的不确定性和负载干扰时,具有良好的稳定性和安全性。
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来源期刊
IET Cyber-Physical Systems: Theory and Applications
IET Cyber-Physical Systems: Theory and Applications Computer Science-Computer Networks and Communications
CiteScore
5.40
自引率
6.70%
发文量
17
审稿时长
19 weeks
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