Abstract
With the rapid development of ICT technology and automation control technology, the distribution network has gradually transformed into a distribution network cyber-physical system (distribution network CPS) with highly coupled information and physical systems. The information system supports the stable operation of the physical system but also brings about certain security risks to the distribution network CPS. Therefore, information impact should be considered in the original anticipated physical fault assessment. This paper proposes a security analysis and evaluation method for distribution network CPS considering anticipated combined information-physical fault screening. First, based on the CPS structure of the distribution network, a CPS correlation matrix model of the distribution network that can reflect the power-information coupling characteristics is established. Then, we analyze the correlation between information failure and physical failure, and we construct an initial anticipated combined information-physical-fault set according to topology and service correlations. Next, based on the fault recovery rate ordering, the key anticipated combined information-physical fault is selected. Finally, for the selected combination of anticipated failures, an assessment of the distribution network CPS security assessment indicators is carried out and verified via example.
Highlights
Given the advancement of smart grid and energy internet strategies, a high degree of coupling of information and physics has become a key feature of smart distribution networks [1]
In the distribution network CPS, the degree of influence of information on the physical system mainly depends on the role of information functions in power grid fault handling and recovery [7]–[9]
According to the CPS safety of the power distribution network, this paper proposes the failure recovery rate index as a fast screening index for the expected failure set of the information-physical combination
Summary
Given the advancement of smart grid and energy internet strategies, a high degree of coupling of information and physics has become a key feature of smart distribution networks [1]. Anticipated failure analysis [11] is based on the experience and existing knowledge of the operation dispatcher to establish a set of expected failure sets according to various possible failure locations and types of failures and to perform a safety and stability analysis of each of the expected failures in the anticipated failure set This method is currently widely used in the field of large power grids, and only a failure on the physical side is generally considered. This paper takes the failure recovery process of the distribution network CPS as the starting point; the indirect impact of information system failure on the physical system is analyzed, the distribution network CPS correlation matrix model reflecting the powerinformation coupling characteristics is established and based on the k(N − 1 + 1) security analysis criteria of the distribution network, and an information-physical combination anticipated fault set is constructed. The above method can quickly analyze the impact of information- physical-failure on Distribution Network CPS
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