作者：
Islam, ShafiqulNCF-263
Xavier University of Louisiana Dept. of Dual-Degree Computer Science and Engineering New OrleansLA70125 United States
In this paper, we present adaptive sliding mode-based load frequency control for interconnected electric power systems networks with the presence of disturbances. The design comprises a state and sliding mode feedback...
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作者：
Islam, ShafiqulNcf 263
Xavier University of Louisiana Dual-Degree Computer Science and Engineering Intelligent Robotics Mechatronics and Autonomous Systems Lab New OrleansLA70125 United States
This paper presents a delay-dependent convergence criterion for load frequency control (LFC) for smart power grid networks with the presence of disturbances and time-varying delays. The LFC scheme comprises delayed re...
详细信息
In this paper, we present adaptive sliding mode-based load frequency control for interconnected electric power systems networks with the presence of disturbances. The design comprises a state and sliding mode feedback...
In this paper, we present adaptive sliding mode-based load frequency control for interconnected electric power systems networks with the presence of disturbances. The design comprises a state and sliding mode feedback vector with robust and adaptive control terms to learn and compensate for disturbances. The disturbances in power networks may appear from load variations, modelling errors and other external fault disturbances. The power networks may also face additional disturbance from the changes in the power system structure for bilateral contracts between distribution and transmission companies for the future open and liberal electricity trading policy. The design and analysis are developed by using the Lyapunov method. It is shown in our analysis shows that the states of the power networks are bounded and their bounds asymptotically converge to zero in the Lyapunov sense. Compared with existing results, the proposed method does not require the exact bounds of the disturbances. The design is simple and easy to implement as it does not require the exact model of the interconnected power systems networks. Evaluation results on three-area power systems with extreme conditions are presented to illustrate the effectiveness of the proposed method for real-time applications.
This paper presents a delay-dependent convergence criterion for load frequency control (LFC) for smart power grid networks with the presence of disturbances and time-varying delays. The LFC scheme comprises delayed re...
This paper presents a delay-dependent convergence criterion for load frequency control (LFC) for smart power grid networks with the presence of disturbances and time-varying delays. The LFC scheme comprises delayed remote measurement and control signals with local state feedback signals. The convergence criteria are developed by using Lyapunov-Krasovskii functional for both symmetrical and asymmetrical time-varying delays associated with remote measurement and control channel. First, the analysis shows that all the power system states are bounded and asymptotically stable without the presence of disturbances. Then, the convergence analysis proves that all the power systems states are bounded and their bounds guarantee the convergence property of the $H_{\infty}$ control with the presence of bounded disturbances. These convergence properties are achieved by using well know Linear Matrix Inequalities (LMIs). Compared with the existing design, the proposed analysis uses both symmetrical and asymmetrical time-varying delays in the measurement channel from RTU to the control center and in the control channel from the control center to the power generation unit. In contrast with reported designs, the proposed design and analysis uses the disturbances associated with the closed loop systems appearing from modeling errors and other external load disturbances and faults.
The increasing prevalence of multidrug-resistant Acinetobacter baumannii as an opportunistic pathogen in wound infections raises significant concerns due to its antibiotic resistance and biofilm-mediated antibiotic to...
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The increasing prevalence of multidrug-resistant Acinetobacter baumannii as an opportunistic pathogen in wound infections raises significant concerns due to its antibiotic resistance and biofilm-mediated antibiotic tolerance. This underscores the urgent need to explore an alternative approach to effectively managing wound infections caused by MDR A. baumannii . In this study, combining subinhibitory concentrations of curcumin (25 µg/ml) or chitosan (156 µg/ml) with photodynamic therapy-PDT (10 J/cm 2 ) resulted in a significant reduction of planktonic viabilities and biofilm biovolume of MDR A. baumannii clinical isolates in vitro . In murine A. baumannii- associated wound infection, a combination of curcumin (25 µg/ml) or chitosan (156 µg/ml) with PDT (10 J/cm 2 ) resulted in complete bacterial eradication with wound healing at Day 15 of post-treatments with these combination therapies. Our study demonstrated that combining curcumin or chitosan with PDT at their subinhibitory concentrations represents a promising alternative strategy as localized therapy for effectively managing A. baumannii -associated wound infection.
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