TK1034 : Modelling & Robust Distributed Event Triggered Control of DC Microgrids with Communication Delays ‌
Thesis > Central Library of Shahrood University > Electrical Engineering > PhD > 2024
Authors:
Mohaddeseh Amerian [Author], Hossein Gholizade-Narm[Supervisor], [Advisor]
Abstarct: This research adopts a comprehensive approach to analyze and propose innovative solutions for the challenges in implementing distributed control within DC microgrids. In this context, two primary control objectives are considered as the fundamental pillars of this study: regulating the average bus voltage and achieving balanced current distribution among distributed generation sources. The realization of these objectives, within the frxamework of operational challenges such as heterogeneous delays in communication networks and inherent bandwidth limitations, introduces significant complexities in the design and analysis of control systems. The first section of this thesis presents a modified secondary control scheme. This scheme aims to model the delayed system in a standard form, thereby resolving the singularity issue of the Laplacian matrix. Furthermore, a novel estimator is proposed to reduce the average voltage deviation and minimize communication load. Robust stability analysis of the system is conducted utilizing Lyapunov-Krasovskii theory, and optimal control gains are designed baxsed on linear matrix inequalities. The second part of the research addresses the issue of communication bandwidth reduction. To this end, a novel dynamic event-triggered control mechanism is proposed. This mechanism significantly reduces network traffic by optimizing the information transmission process and limiting it to essential time intervals. In this section, the disturbed delayed system is modeled in standard form, and robust stability analysis is performed using the Lyapunov-Krasovskii method. Control gains are also designed baxsed on linear matrix inequalities. Results from extensive simulations and practical implementation of the system demonstrate the efficiency and effectiveness of the proposed methods. These findings indicate that the novel approaches presented are capable of achieving control objectives despite the presence of heterogeneous communication delays.
Keywords:
#DC microgrid #event-triggered control #secondary control #heterogeneous communication delay #Lyapunov-Krasovskii stability theorem. Keeping place: Central Library of Shahrood University
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