Real-time network security monitoring, assessment and optimization

Wu, F.F.

doi:10.1016/0142-0615(88)90020-8

Cited by 45 publications

(9 citation statements)

References 98 publications

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“…With development of computational ability, application algorithms, communication technology, infrastructure, and power system equipment control centers keep upgrading from analog to digital computation and communication [1][2][3]. Supervisory Control and Data Acquisition (SCADA) system is also following this development.…”

Section: Introductionmentioning

confidence: 99%

Framework Incorporating Synchronized Phasor Data for Power System Operation and Control

Zhu

Chenine

et al. 2012

9th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2012)

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This position paper presents initial research and investigation on a unified framework combining two independent systems, the legacy SCADA system and the synchronized phasor data system, that share the same measurement sources, i.e., current and voltage transducers and the same communication medium. In this framework, conventional SCADA system coupled with substation automation system are modeled together with synchronized phasor systems. The contribution of this paper also includes a state-ofthe-art survey of topics related to the proposed architectures. Furthermore, an overview of the data flows between substation and control centers including both SCADA and phasor measurements are presented. Taking into consideration the growing interest in communication and automation standardization this paper also addresses the communication between the substations coupled with relevant standards and technology.

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Section: Introductionmentioning

confidence: 99%

Framework Incorporating Synchronized Phasor Data for Power System Operation and Control

Zhu

Chenine

et al. 2012

9th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2012)

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“…The results from state estimation provides the real-time database [1], [3] for other network applications such as security assessment, determination of power flows in parts of network that are not directly metered, optimal power flow, contingency analysis, etc. State estimation can also be used for data validation.…”

Section: Introductionmentioning

confidence: 99%

“…Power system state estimation is a mathematical procedure [1] which processes a set of real-time measurements such as voltages, real and reactive power injections, real and reactive power flows using the topology determined by the topology processor to come out with the best estimate of the current state of the power system. The state of a system is defined as a vector of the voltage magnitude and voltage angle of each bus of that system.…”

Section: Introductionmentioning

confidence: 99%

State Estimation of the Tanzanian Power System Network Using Non-Quadratic Criterion and MATLAB Environment

Kusekwa¹

2014

IJEPE

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Abstract:Power system state estimation is an effective online tool for monitoring, control and for providing consistent database in energy management systems. This paper presents an algorithm for state estimation of the Tanzanian power system network using a non-quadratic state criterion. Equality and inequality constraints existing in a power system are included in formulating the estimation problem. Equality constraints are target values used in load flow analysis and are included in power system state estimation in order to restore observability to those parts of the power system network which are permanently or temporarily unobservable. Inequality constraints are limits such as minimum and maximum reactive power generation, transformer tap and phase-shift. The solution techniques used is primal-dual interior point logarithmic barrier functions to treat the inequality constraints. An algorithm is developed using the method and a program coded in MATLAB is applied in implementing the simulation. Computational issues arising in the implementation of the algorithm are presented. The simulation results demonstrate that the primal-dual logarithmic barrier interior point algorithm is a useful numerical tool to compute the state of an electrical power system network. The inequality constraints play essential role in enhancing the reliability of the estimation results. Also, it is expected that significant benefit could be gained from application of the constrained state estimation algorithm to the Tanzanian power system network.

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“…Dentre as funções principais do sistema de análise de redes, enquadram-se: préfiltragem de informações, configurador de redes, estimador de estado, algoritmo de previsão de carga, fluxo de potência, análise de segurança, fluxo de potência ótimo e outros. A figura 1.1, a seguir, ilustra um diagrama de blocos contendo as funções principais do sistema de análise de redes, bem como o relacionamento entre elas (WU, 1988;BALU et al, 1992):…”

Section: Capítulo1unclassified

“…Figura 1.1: Diagrama de blocos das funções principais do sistema de análise de redes O aprofundamento teórico sobre essas funções não será apresentado no presente texto, o qual se limitará ao processo de estimação de estado. Entretanto, uma vasta revisão bibliográfica sobre as mesmas e suas evoluções, ao longo de mais de três décadas, pode ser obtida em trabalhos de Dy Liacco (1974-2002, Wu (1988), Wu et al (2005) e Balu et al(1992).…”

Section: Capítulo1unclassified

Índice de não-detecção de erros grosseiros no processo de estimação de estado em sistemas elétricos de potência

Benedito¹

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The present thesis proposes an index, called Undetectability Index (UI), to classify the measurements according to their characteristics of not reflecting their errors into the residuals of the weighted least squares state estimation process from a geometric analysis of this estimator. Gross errors in measurements with higher UIs are very difficult to be detected by methods based on the residual analysis, as the errors in those measurements are "masked", i.e., they are not reflected in the residuals. In this sense, critical measurements are the limit case of measurements that mask errors, that is, they have infinite UI and their residuals are always zero independently of their having or not gross errors. Based on the UI a methodology for gross error processing and two algorithms for metering system planning are also proposed in this thesis. These algorithms enable the obtaining of reliable measurement systems (observable and free from critical measurements and critical sets of measurements) with low investment and containing only measurements with UIs lower than a pre-established value. Several simulation results (with IEEE 14-bus and 30-bus systems) have validated the UI and its application.

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Real-time network security monitoring, assessment and optimization

Cited by 45 publications

References 98 publications

Framework Incorporating Synchronized Phasor Data for Power System Operation and Control

Framework Incorporating Synchronized Phasor Data for Power System Operation and Control

State Estimation of the Tanzanian Power System Network Using Non-Quadratic Criterion and MATLAB Environment

Índice de não-detecção de erros grosseiros no processo de estimação de estado em sistemas elétricos de potência

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