Cyberattacks with limited network information leading to transmission line overflow in cyber-physical power systems

2021 ◽  
pp. 100505
Author(s):  
Javad Khazaei
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
Network Information

Toward Online Control of Local Bifurcation in Power Systems via Network Topology Optimization

2015 ◽  
Vol 25 (12) ◽  
pp. 1550167
Author(s):  
Lei Wang ◽  
Hsiao-Dong Chiang
Keyword(s):  
Topology Optimization ◽  
Power Systems ◽  
Transmission Line ◽  
Network Topology ◽  
Online Control ◽  
Power Grids ◽  
Local Bifurcations ◽  
Network Topology Optimization ◽  
Online Methods ◽  
The Impact

This paper presents online methods for controlling local bifurcations of power grids with the goal of increasing bifurcation values (i.e. increasing load margins) via network topology optimization, a low-cost control. In other words, this paper presents online methods for increasing power transfer capability subject to static stability limit via switching transmission line out/in (i.e. disconnecting a transmission line or connecting a transmission line). To illustrate the impact of network topology on local bifurcations, two common local bifurcations, i.e. saddle-node bifurcation and structure-induced bifurcation on small power grids with different network topologies are shown. A three-stage online control methodology of local bifurcations via network topology optimization is presented to delay local bifurcations of power grids. Online methods must meet the challenging requirements of online applications such as the speed requirement (in the order of minutes), accuracy requirement and robustness requirement. The effectiveness of the three-stage methodology for online applications is demonstrated on the IEEE 118-bus and a 1648-bus practical power systems.

scholarly journals Analysis of the Incidence of Direct Lightning over a HVDC Transmission Line through EFD Model

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 555 ◽  
Author(s):  
Ednardo Rodrigues ◽  
Ricardo Pontes ◽  
João Bandeira ◽  
Victor Aguiar
Keyword(s):  
Finite Elements ◽  
Electric Field ◽  
Power Systems ◽  
Transmission Line ◽  
Lightning Strikes ◽  
Shielding Failure ◽  
Hvdc Transmission ◽  
Hvdc Line ◽  
Four Levels ◽  
Electrogeometric Model

HVDC systems are becoming more common worldwide, specially in Brazil, since the adoption of such system for Itaipu’s hydroelectric complex in the 1980’s. Today, the country has the Xingu-Estreito bipole, with length of 2375 km. This system crosses a region with high lightning incidence, a phenomenon which causes faults in power systems. The most widely used model for the positioning of the arrestor cables over a transmission line is the electrogeometric model. This model, however, does not take into account the different potentials over the structure’s surface, and therefore presents significant inaccuracies when assessing the risk of lightning strikes on structures such as a HVDC line. This work then used the Electric Field Deflection (EFD) model with the aid finite elements. Four levels of lightning are assessed (I, II, III and IV), with current peaks of 3.9, 5.4, 10.1 and 15.7 kA. It was verified that the positive pole tends to attract most of the lightning with shielding failures width (SFW) of 12, 8, 4 and 0 m. It was then proposed to move the arrestor cables horizontally. The study indicates that this horizontal shifting of the cables in 5 and 8 m toward the side with larger chance of direct incidence reduces the shielding failure widths in 50% for peak current of 3.9 kA and almost eliminates the strikes for lightning with peak currents of 5.4, 10.1 and 15.7 kA.

scholarly journals A Novel Approach to Arcing Faults Characterization Using Multivariable Analysis and Support Vector Machine

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2126 ◽  
Author(s):  
John Morales ◽  
Eduardo Muñoz ◽  
Eduardo Orduña ◽  
Gina Idarraga-Ospina
Keyword(s):  
Support Vector Machine ◽  
Power Systems ◽  
Transmission Line ◽  
Transmission Lines ◽  
Multivariable Analysis ◽  
Support Vector ◽  
Committee Report ◽  
Fault Type ◽  
Novel Approach ◽  
Convolution Process

Based on the Institute of Electrical and Electronics Engineers (IEEE) Standard C37.104-2012 Power Systems Relaying Committee report, topics related to auto-reclosing in transmission lines have been considered as an imperative benefit for electric power systems. An important issue in reclosing, when performed correctly, is identifying the fault type, i.e., permanent or temporary, which keeps the faulted transmission line in service as long as possible. In this paper, a multivariable analysis was used to classify signals as permanent and temporary faults. Thus, by using a simple convolution process among the mother functions called eigenvectors and the fault signals from a single end, a dimensionality reduction was determined. In this manner, the feature classifier based on the support vector machine was used for acceptably classifying fault types. The algorithm was tested in different fault scenarios that considered several distances along the transmission line and representation of first and second arcs simulated in the alternative transients program ATP software. Therefore, the main contribution of the analysis performed in this paper is to propose a novel algorithm to discriminate permanent and temporary faults based on the behavior of the faulted phase voltage after single-phase opening of the circuit breakers. Several simulations let the authors conclude that the proposed algorithm is effective and reliable.

scholarly journals Integrating Greenhouse Gas Emissions Costs in Lifecycle Loss Evaluations: A Case Study for Transmission Lines

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Antonis L. Lazari ◽  
Charalambos A. Charalambous
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
Transmission Lines ◽  
Evaluation Method ◽  
Energy Savings ◽  
Electrical Energy ◽  
Low Loss ◽  
Enhanced Transmission ◽  
Investment Volume

Considering the investment volume in the electrical energy infrastructure and the increasing awareness for global warming and climate change, this paper aims to deliver an enhanced transmission line losses evaluation method that integrates true environment financial figures. The enormous volume of transmission lines utilized in power systems across the world provides a considerable potential for energy savings by adopting the idea of “energy-efficient transmission lines.” In this paper the total owning cost (TOC) formula with built-in environmental components is used to assess the relative economic benefit of a high-first-cost, low-loss transmission line unit versus one with a lower first cost and higher losses. The proposed methodology is applied on the Cyprus Power System, by incorporating true financial data and system characteristics.

scholarly journals A Modular Neural Network Scheme Applied to Fault Diagnosis in Electric Power Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-13
Author(s):  
Agustín Flores ◽  
Eduardo Quiles ◽  
Emilio García ◽  
Francisco Morant ◽  
Antonio Correcher
Keyword(s):  
Fault Diagnosis ◽  
Power Systems ◽  
Power System ◽  
Transmission Line ◽  
Electric Power ◽  
Diagnostic System ◽  
Specific Area ◽  
Electric Power Systems ◽  
Electric Power System ◽  
Power Network

This work proposes a new method for fault diagnosis in electric power systems based on neural modules. With this method the diagnosis is performed by assigning a neural module for each type of component comprising the electric power system, whether it is a transmission line, bus or transformer. The neural modules for buses and transformers comprise two diagnostic levels which take into consideration the logic states of switches and relays, both internal and back-up, with the exception of the neural module for transmission lines which also has a third diagnostic level which takes into account the oscillograms of fault voltages and currents as well as the frequency spectrums of these oscillograms, in order to verify if the transmission line had in fact been subjected to a fault. One important advantage of the diagnostic system proposed is that its implementation does not require the use of a network configurator for the system; it does not depend on the size of the power network nor does it require retraining of the neural modules if the power network increases in size, making its application possible to only one component, a specific area, or the whole context of the power system.

scholarly journals Application of Network Information Communication Technology in Power System

2018 ◽  
Vol 2 (6) ◽  
Author(s):  
Chuanpeng Liu
Keyword(s):  
Power Systems ◽  
Power System ◽  
Information Transmission ◽  
Communication Technology ◽  
Information Communication Technology ◽  
Operational Efficiency ◽  
Power Grids ◽  
Information Communication ◽  
Efficient Operation ◽  
Network Information

Abstract: Network information communication technology in power systems is the key to ensuring the safe and efficient operation of power grids. The network information communication technology itself has advantages in automation operation and information transmission, thus is widely applied to the power system. In the case of ensuring that the power system is compatible with the network information communication technology, the control of the power system can be strengthened, and the operational efficiency of the power system can be improved. This paper mainly analyzes the specific application of network information communication technology in power system.

scholarly journals Incorporating Open/Free GIS and GPS Software in Power Transmission Line Routine Work: The Case of Crete and Rhodes

2017 ◽  
Vol 7 (1) ◽  
pp. 1316-1322 ◽  
Author(s):  
D. Pylarinos ◽  
I. Pellas
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
Power Transmission ◽  
Geographical Information ◽  
Routine Work ◽  
Global Positioning ◽  
Line Work ◽  
User Friendly ◽  
Planning And Operation

Geographical Information System (GIS) and Global Positioning System (GPS) software are widely gaining attention in power system planning and operation. Although commercial systems are increasingly being incorporated in power systems applications, they are yet to be fully incorporated in the routine work of utilities (and especially in the work of crews), due to several reasons such as cost, portability, connectivity, performance/speed, infrastructure etc. This paper focuses on incorporating certain open/free GIS and GPS software in routine transmission line work. The case study is the 150kV transmission systems of the Greek islands of Crete and Rhodes which show increased complexity due to certain localized factors such as Greek legislation, the diverse terrain/routes, the segmented design due to the network’s growth over the years (regarding both voltage levels and routes) and the use of different Coordinate Reference Systems (or Geodetic Systems) from the Greek state. The main goals of this work was to incorporate open/free software that provided limitless online access points, offline navigation and a user friendly design that wouldn’t require any additional training, programming etc. The basic scheme described in this paper can be followed to provide similar results in other applications.

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