Journal ArticleDOI
Master–Slave Current-Sharing Control of a Parallel DC–DC Converter System Over an RF Communication Interface
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TLDR
The proposed control concept, which can potentially attain redundancy that is achievable using a droop method, may lead to more robust and reconfigurable control implementation of distributed converters and power systems and may also be used as a (fault-tolerant) backup for wire-based control of parallel/distributed converters.Abstract:
Using analog wireless communication, we demonstrate a master-slave load-sharing control of a parallel dc-dc buck converter system, thereby eliminating the need for physical connection to distribute the control signal among the converter modules. The current reference for the slave modules is provided by the master module using radio-frequency (RF) transmission, thereby ensuring even sharing of the load current. The effect of delay due to RF transmission on system stability and performance is analyzed, and regions of operation for a stable as well as satisfactory performance are determined. We experimentally demonstrate a satisfactory performance of the master-slave converter at 20-kHz switching frequency under steady state as well as transient conditions in the presence of a transmission delay. The proposed control concept, which can potentially attain redundancy that is achievable using a droop method, may lead to more robust and reconfigurable control implementation of distributed converters and power systems. It may also be used as a (fault-tolerant) backup for wire-based control of parallel/distributed converters.read more
Citations
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Journal ArticleDOI
Control of Distributed Uninterruptible Power Supply Systems
TL;DR: The most important control schemes for the parallel operation of UPS systems, including active load-sharing techniques and droop control approaches, are depicted.
Journal ArticleDOI
Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids
TL;DR: In this article, the adaptive/improved droop control, network-based control methods, and cost-based droop schemes are compared and summarized for active power sharing for islanded microgrids.
Journal ArticleDOI
Implementation of Hierarchical Control in DC Microgrids
TL;DR: This paper presents a practical dc microgrid developed in the Water and Energy Research Laboratory (WERL) in the Nanyang University of Technology, Singapore using a novel hierarchical control technique.
Journal ArticleDOI
Impact of Communication Delays on Secondary Frequency Control in an Islanded Microgrid
TL;DR: Results from the Canadian urban distribution system have verified that communication delays can adversely affect the micro grid secondary frequency control, and the proposed gain scheduling approach can improve the robustness of the microgrid secondary frequency controller to communication delays.
Journal ArticleDOI
Reduced-Order Model and Stability Analysis of Low-Voltage DC Microgrid
TL;DR: This paper analyzes the stability of low-voltage dc microgrid systems using a linearized system model derived using small-signal approximation and identifies the eigenvalues of the system matrix to provide upper bound on droop constants.
References
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Linear Matrix Inequalities in System and Control Theory
TL;DR: In this paper, the authors present a brief history of LMIs in control theory and discuss some of the standard problems involved in LMIs, such as linear matrix inequalities, linear differential inequalities, and matrix problems with analytic solutions.
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TL;DR: Preface, Notations 1.Introduction to Time-Delay Systems I.Robust Stability Analysis II.Input-output stability A.LMI and Quadratic Integral Inequalities Bibliography Index
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Piecewise Linear Control Systems
Mikael Johansson,M. Johanssn +1 more
TL;DR: This thesis treats analysis and design of piecewise linear control systems, and it is shown how Lyapunov functions with a discontinuous dependence on the discrete state can be computed via convex optimization.