A Security Level Classification Method for Power Systems under N-1 Contingency

Security assessment is crucial for the reliable and secure operation of power systems. This paper proposes a security level classification (SLC) method to analyze the security level of power systems both qualitatively and quantitatively. In this SLC method, security levels are graded according to a...

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Main Authors: Zhigang Lu, Liangce He, Dan Zhang, Boxuan Zhao, Jiangfeng Zhang, Hao Zhao
Format: Article
Language:English
Published: MDPI AG 2017-12-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/10/12/2055
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spelling doaj-089db3e2ec7e427f82e471e1beb93af92020-11-24T21:15:23ZengMDPI AGEnergies1996-10732017-12-011012205510.3390/en10122055en10122055A Security Level Classification Method for Power Systems under N-1 ContingencyZhigang Lu0Liangce He1Dan Zhang2Boxuan Zhao3Jiangfeng Zhang4Hao Zhao5Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, ChinaKey Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, ChinaWeixian Power Supply Subsidiary, State Grid Hebei Electric Power Co., Ltd., Weixian 056800, ChinaKey Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, ChinaSchool of Electrical, Mechanical and Mechatronic Systems, University of Technology Sydney, Ultimo, NSW 2007, AustraliaKey Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, ChinaSecurity assessment is crucial for the reliable and secure operation of power systems. This paper proposes a security level classification (SLC) method to analyze the security level of power systems both qualitatively and quantitatively. In this SLC method, security levels are graded according to a comprehensive safety index (CSI), which is defined by integrating the system margin index (SMI) and load entropy. The SMI depends on the operating load and the total supply capacity (TSC) under N-1 contingency, and the load entropy reflects the heterogeneity of load distribution calculated from entropy theory. In order to calculate the TSC under N-1 contingency considering both of the computational accuracy and speed, the TSC is converted into an extended conic quadratic programming (ECQP) model. In addition, the load boundary vector (LBV) model is established to obtain the capacity limit of each load bus, and thus detect potential risks of power systems. Finally, two modified practical power systems and the IEEE 118-bus test system are studied to validate the feasibility of the proposed SLC method.https://www.mdpi.com/1996-1073/10/12/2055comprehensive safety index (CSI)extended cone quadratic programming (ECQP)security level classification (SLC)total supply capacity (TSC)
collection DOAJ
language English
format Article
sources DOAJ
author Zhigang Lu
Liangce He
Dan Zhang
Boxuan Zhao
Jiangfeng Zhang
Hao Zhao
spellingShingle Zhigang Lu
Liangce He
Dan Zhang
Boxuan Zhao
Jiangfeng Zhang
Hao Zhao
A Security Level Classification Method for Power Systems under N-1 Contingency
Energies
comprehensive safety index (CSI)
extended cone quadratic programming (ECQP)
security level classification (SLC)
total supply capacity (TSC)
author_facet Zhigang Lu
Liangce He
Dan Zhang
Boxuan Zhao
Jiangfeng Zhang
Hao Zhao
author_sort Zhigang Lu
title A Security Level Classification Method for Power Systems under N-1 Contingency
title_short A Security Level Classification Method for Power Systems under N-1 Contingency
title_full A Security Level Classification Method for Power Systems under N-1 Contingency
title_fullStr A Security Level Classification Method for Power Systems under N-1 Contingency
title_full_unstemmed A Security Level Classification Method for Power Systems under N-1 Contingency
title_sort security level classification method for power systems under n-1 contingency
publisher MDPI AG
series Energies
issn 1996-1073
publishDate 2017-12-01
description Security assessment is crucial for the reliable and secure operation of power systems. This paper proposes a security level classification (SLC) method to analyze the security level of power systems both qualitatively and quantitatively. In this SLC method, security levels are graded according to a comprehensive safety index (CSI), which is defined by integrating the system margin index (SMI) and load entropy. The SMI depends on the operating load and the total supply capacity (TSC) under N-1 contingency, and the load entropy reflects the heterogeneity of load distribution calculated from entropy theory. In order to calculate the TSC under N-1 contingency considering both of the computational accuracy and speed, the TSC is converted into an extended conic quadratic programming (ECQP) model. In addition, the load boundary vector (LBV) model is established to obtain the capacity limit of each load bus, and thus detect potential risks of power systems. Finally, two modified practical power systems and the IEEE 118-bus test system are studied to validate the feasibility of the proposed SLC method.
topic comprehensive safety index (CSI)
extended cone quadratic programming (ECQP)
security level classification (SLC)
total supply capacity (TSC)
url https://www.mdpi.com/1996-1073/10/12/2055
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