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This paper presents an approach of power grid vulnerability assessment based on maximum flow. Solution of the maximum flow problem of the power grid provides a rank of different transmission lines of the power grid in terms of real power flow based criticality. The dual formulation of the maximum flow problem provides a set of transmission lines that need to be monitored carefully to maintain connectivity...
In this paper, a complex network framework based network resiliency (percolation) analysis has been presented. A topological model of transmission level Australian National Electricity Market (NEM) with projected renewable integration has been simulated. The effects of random and targeted removal of transmission lines or substations on the network structure and functionality have been analyzed. A...
This paper justifies the criticality of nodes in a power system found from previous analysis. Critical nodes are identified from complex network theory based modified centrality approaches whose failure would stress the system badly in terms of line overloading. Impact of removal of critical nodes on two different standard test systems are analyzed. Simulation results suggest that these indices do...
A centrality measure has been proposed considering the directionality of power flow of future smart grid. Applicability of the proposed method has been evaluated in several standard IEEE test systems. Various comparisons are shown between impacts of removal of critical nodes found from two different models: nondirectional and bidirectional. Larger impact of removing critical nodes found from bidirectional...
New closeness and betweenness based centrality measures have been evaluated in this paper. Power grid is modeled as a directed graph. The graph is analyzed in terms of complex network theory to identify influential nodes which control power flow pattern throughout the whole grid and as a result can create cascade if removed unintentionally or targetedly. Various measures of impacts have been analyzed...
Unified Power Quality Conditioner (UPQC) can fulfil multiple power quality control objectives such as needs of reactive power compensation, voltage flicker and harmonics current compensation. However UPQCs are quite expensive and therefore are not widely used. In this paper the potential of Plug in Hybrid Electric Vehicles (PHEV) in a V2G mode of operation is explained, which gives a low-cost solution...
Modified versions of betweenness and closeness centrality measures are proposed to identify and rank critical nodes in power systems. Power flows in various lines of a transmission system are taken as weighting parameters to calculate betweenness and closeness centrality measures. Changes in measures of impact like path length, connectivity loss and size of blackout are observed when nodes from the...
The HVDC converters used for rectifying or inverting operations absorb reactive power from the converters connected bus. Compensation of reactive power in AC side of converters is quite necessary in either case of operation. On the other hand the nonlinear behavior of power electronic converters produces harmonics in both sides of HVDC links. Passive and active filters are used to filter the harmonics...
A new model of power system to identify critical elements for smart and bulk power transmission grid environment is presented in this paper. Proposed bidirectional power flow model under complex network framework can quantify the criticality of nodes whose removal would trigger cascading failure. The proposed model based centrality, which is an extension of nominal power flow based model, is able...
Bidirectional or two way power flow based centrality measure has been implemented in bulk and smart power transmission systems. Proposed model can identify critical nodes from the system whose removal would affect the system severely. A combination of two models has been adopted to capture the power flow scenario of smart grid. Impacts of removal of critical nodes have been analyzed in terms of increase...
The classical definitions of various centrality measures are modified to incorporate electrical parameters of the power grid. In this paper three distinct measures of centrality are presented and they are described with suitable examples. The usefulness of these measures are described. Various standard test systems are simulated to find critical nodes of the system. Complex network is a new area of...
Voltage profile of distribution networks with distributed generation are affected significantly due to the integration of distributed generation (DG) on it. This paper presents a way to control voltage of distribution networks with DG using reactive power compensation approach. In this paper, the voltage control approach is shown based on the worst case scenario of the network. To keep the voltage...
A method of critical node identification in a power system is presented in this paper. Maximum flow in a network is used to measure centrality of various nodes in the power system. The proposed approach is an improvement of previous methodology in the sense that it does not take into consideration shortest electrical distance as path to flow power. Instead of using normal steady-state condition maximum...
In this paper, a new methodology for stability assessment of a smart power system is proposed. The key to this assessment is an index called betweenness index which is based on ideas from complex network theory. The proposed betweenness index is an improvement of previous works since it considers the actual real power flow through the transmission lines along the network. Furthermore, this work initiates...
For large scale analysis of power grid using complex network framework a network matrix is formed. The elements of the matrix represents the pair dependency of various buses of the system. This matrix could be used as a measure of centrality of various buses of a power system. A simple test system is used to illustrate the idea behind the dependency matrix of the power system as well as to demonstrate...
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