An Eigen-Based Approach for Enhancing Matrix Inversion Approximation in Massive MIMO Systems

Lee, Kelvin Kuang-Chi; Chen, Chiao-En

doi:10.1109/tvt.2016.2622010

Cited by 14 publications

(4 citation statements)

References 15 publications

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“…If the vertex is denoted by V of G and if the subset of vertices is denoted by P in one component of G induced by cut set, then P, P represents the cut set, where P = V − P. Dimension of the n vertices for Cut set space of a graph is (n − 1). By utilizing these, the final Laplacian matrix will be denoted as L G [40][41][42].…”

Section: Representation Of the Networkmentioning

confidence: 99%

RES Based Islanded DC Microgrid with Enhanced Electrical Network Islanding Detection

et al. 2021

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An electrical islanding detection method for DC microgrid (MG) is proposed in this paper. Unlikely conventional AC MG system protection has been challenging for the DC MG system. The goal of the proposed scheme is to detect the islanding intelligently within the agent nodes. The proposed islanding detection technique detects the electrical link failure intelligently, and if any electrical link failure occurs, then the proposed technique maintains the MG operation and load sharing. Islanding detection is carried out using an injection signal and utilizes the existing communication network to check network connectivity. After checking the network connectivity, all the nodes maintain the look-up table of the connected network. This research work illustrates that the proposed electrical islanding detection technique is effective in maintaining the DC MG operation in the case of an electrical islanding/link failure scenario. The proposed scheme’s performance is checked through MATLAB/Simulink for the detection of islanding and maintaining the operation.

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Section: Representation Of the Networkmentioning

confidence: 99%

RES Based Islanded DC Microgrid with Enhanced Electrical Network Islanding Detection

et al. 2021

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“…A set of old vertices V g with possible unvisited edges are stored in memory [32,33]. The updated Laplacian matrix then can be obtained as [32,34,35]. The following Lemmas elaborate the formation of cut-sets: Lemma 1.…”

Section: Depth First Search Algorithmmentioning

confidence: 99%

A Virtual Micro-Islanding-Based Control Paradigm for Renewable Microgrids

et al. 2018

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Improvements in control of renewable energy-based microgrids are a growing area of interest. A hierarchical control structure is popularly implemented to regulate key parameters such as power sharing between generation sources, system frequency and node voltages. A distributed control infrastructure is realized by means of a communication network that spans the micro-distribution grid. Measured and estimated values, as well as corrective signals are transmitted across this network to effect required system regulation. However, intermittent latencies and failures of component communication links may result in power imbalances between generation sources, deviations in node voltages and system frequency. This paper proposes a hierarchical control structure to regulate the operation of an islanded AC microgrid experiencing communication link failures. The proposed strategy aims to virtually sub-divide the microgrid into controllable "islands". Thereafter, active power sharing, frequency and voltage restoration is achieved by competing converter systems through multi-agent consensus. The effectiveness of the proposed methodology has been verified through stability analyses using system wide mathematical small signal models and case study simulations in MATLAB, Simpower systems.

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“…Essentially, the in-degree matrices have a greater effect on the global dynamics of the node, which is influenced by its neighbors. In a practical system, if the graph is undirected (which means all the links are bi-directional), then the Laplacian matrix is balanced [30][31][32].…”

Section: Review Of Graph Theorymentioning

confidence: 99%

A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

et al. 2018

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Abstract:Communication-based distributed secondary control is extensively used in DC microgrids. Compared to centralized control, it can provide better voltage regulation and load sharing in microgrids. A conventional secondary control technique that converges the system to a common operating point is improved by using the control methodology to detect the communication link failure and stabilize the system operation during communication islanding. Recently, more robust control schemes have been proposed to improve resilience, but communication islanding has not been addressed at the secondary level control for which the system requires additional tertiary control. However, link failure is a possibility in the microgrid, so this paper proposes a control scheme at the secondary level to detect communication islanding. Communication islanding may lead the system to unpredictable behavior, which may cause the system to become unstable and may further lead to a cascading failure. The proposed control scheme sustains the stability and operation of a DC microgrid. Voltage and current observer works in a parallel manner with the proposed secondary control to achieve a correction term for global operating points. The proposed control scheme has been verified through analysis and simulation.

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An Eigen-Based Approach for Enhancing Matrix Inversion Approximation in Massive MIMO Systems

Cited by 14 publications

References 15 publications

RES Based Islanded DC Microgrid with Enhanced Electrical Network Islanding Detection

RES Based Islanded DC Microgrid with Enhanced Electrical Network Islanding Detection

A Virtual Micro-Islanding-Based Control Paradigm for Renewable Microgrids

A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

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