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Open AccessArticle

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

1
Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, China
2
Weixian Power Supply Subsidiary, State Grid Hebei Electric Power Co., Ltd., Weixian 056800, China
3
School of Electrical, Mechanical and Mechatronic Systems, University of Technology Sydney, Ultimo, NSW 2007, Australia
*
Author to whom correspondence should be addressed.
Energies 2017, 10(12), 2055; https://doi.org/10.3390/en10122055
Received: 7 November 2017 / Revised: 30 November 2017 / Accepted: 1 December 2017 / Published: 5 December 2017
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. View Full-Text
Keywords: comprehensive safety index (CSI); extended cone quadratic programming (ECQP); security level classification (SLC); total supply capacity (TSC) comprehensive safety index (CSI); extended cone quadratic programming (ECQP); security level classification (SLC); total supply capacity (TSC)
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Lu, Z.; He, L.; Zhang, D.; Zhao, B.; Zhang, J.; Zhao, H. A Security Level Classification Method for Power Systems under N-1 Contingency. Energies 2017, 10, 2055.

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