Abstract
The existing reliability models of the cyber physical distribution systems, which are mostly based on some simplified assumptions, cannot accurately evaluate the reliability of complex cases in practical engineering applications. To solve this problem, an elaborate reliability evaluation method considering the whole process of fault location, isolation and supply restoration is proposed. This paper establishes reliability models of components and the two systems, summarizes the mapping relationship between various cyber system failures and the physical fault handling into several laws, proposes the reliability evaluation procedure in the framework of Monte Carlo method, and verifies the feasibility and effectiveness of the method in an actual distribution network cyber physical system. In the proposed method, the multiple component characteristics, complex topological structure, coupling relationship of the cyber-physical distribution systems, and the actual human-computer joint participation are considered in the analysis of fault location, isolation and supply restoration process, which provides a effective and accurate theory for the application of reliability evaluation in the actual distribution network and prosumer energy management system.
Highlights
The access of a large number of renewable distributed energy resources (DERs)[1], [2] makes the distribution network become an multi-energy system [3]
The main reason that affects SAIFI is the reliability parameters of the component in physical system, and the cyber physical distribution system (CPDS) reliability algorithm proposed in this paper focuses on the quantitative modeling and analysis of the indirect effect of cyber system on the physical system
4) Compared with case 4, SAIDI, CAIDI and EENS increased by 4.42% (17.5 minutes), 4.39% (13.5 minutes) and 4.53% respectively, and ASAI decreased by 0.0034% in case 3. This shows that the lack of careful consideration of IED reliability model will lead to errors that cannot be ignored in the final reliability calculation results of complex CPDS
Summary
The access of a large number of renewable distributed energy resources (DERs)[1], [2] makes the distribution network become an multi-energy system [3]. How to model the cyber-physical interaction process in CPDS more elaborately, quantify the impact of cyber system failures on the physical system more accurately, and establish a CPDS reliability analysis method suitable for various complex scenarios in the actual distribution network, are the current challenges in this field of research. IEDs which are installed at switches or distribution transformers, are the interface equipment to carry out the real-time monitoring and fault handling of the distribution network The impact of their module faults or communication link faults on the reliability of power supply can be divided into direct impact and indirect impact.
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