Open AccessSecurity distance for distribution system: Definition, calculation, and application
Author(s) -
Xiao Jun,
Lin Qisi,
Bai Linquan,
Zhang Xinsong,
Zuo Lei,
Zhou Huan,
Li Hang
Publication year - 2019
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/2050-7038.2838
Subject(s) - boundary (topology) , security analysis , computer security model , computer science , security service , state (computer science) , distribution (mathematics) , mathematics , computer security , information security , algorithm , mathematical analysis
Summary This paper proposes the definition, calculation, and application of security distance for distribution system. Firstly, state space is divided into N‐1 security region, sub–security region, and insecurity region considering N‐1 contingency. Security distance is the distance from an operating point (state) to the boundary of the security region. Secondly, two types of distances, ie, geometric distance and state distance, in state space are defined. Then 18 specific security distances are defined and calculated using two‐step method based on DC and AC power flow. Thirdly, the application of the proposed security distances on security analysis is presented, including security check, security evaluation, and cross‐boundary analysis. The most insecure directions and security control schemes with minimum cost can be found by the cross‐boundary analysis. Finally, case studies are presented to illustrate and verify the effectiveness of the proposed security distances. In this paper, security distance for distribution system is systematically developed, and the cross‐boundary analysis method enriches the existing security analysis.