A Reliability Evaluation Method for Distribution Network Cyber-Physical System Considering the Whole Process of Fault Handling

Abstract

The invention discloses a reliability evaluation method of a distribution network cyber-physical system considering the whole process of fault processing. The reliability evaluation method of the distribution network cyber-physical system considering the whole process of fault processing comprises the following steps: initializing the distribution network cyber-physical system; confirming the current state of the distribution network cyber-physical system based on the sequential Monte Carlo method; obtaining the reliability of the three stages of fault location, fault isolation and power supply recovery by means of the fault tree model in view of the state of the distribution network cyber-physical system after the fault; classifying the load points according to the fault processing whole process event tree model to determine the impact degree of the fault processing on each load point; and calculating to obtain the system reliability indexes finally. The invention reflects the effect of the information failure on the state of the system after the fault from the overall point of view of fault processing, and takes full consideration of the time sequence process of the fault processing. According to the reliability evaluation method of the distribution network cyber-physical system considering the whole process of fault processing, the function of the information system in the analysis process of the fault consequences is considered, therefore, the invention helps to identify the integrated energy and the weak links of the communication infrastructure, assists the integrated operation of the distribution network cyber-physical system and the planning of the effective decision-making.

Description

technical field [0001] The invention relates to a reliability evaluation method, in particular to a reliability evaluation method of a distribution network information physical system. Background technique [0002] With the rapid development of the smart grid and the deep integration of the power grid and the communication network, the distribution network will become a typical cyber-physical system (CPS), and its safe and reliable operation is highly dependent on the information system. Studying the reliability assessment of distribution network CPS considering the influence of information system will help to identify the weak link in the integrated energy and communication infrastructure, and assist the effective decision-making of distribution network CPS comprehensive operation and planning to meet the increasingly prominent high reliability Power requirements. [0003] Compared with traditional power grid reliability assessment, the key to power grid CPS reliability as...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing power grid CPS reliability evaluation methods: 1) For grid component availability: the traditional grid component reliability parameters are statistical results that include the influence of various factors such as information systems, combined with information component reliability parameters The component reliability parameters corrected by analytical calculations cannot guarantee the credibility of the evaluation results; 2) For the analysis of fault consequences: for a given fault, the distribution network fault processing includes three stages of fault location, isolation and power supply restoration, and the fault consequences are determined by The processing results of the three stages are jointly determined, and the three stages in the whole process of fault handling are a sequential process

As one of the core functions of advanced power distribution operation, distribution network fault handling is the key to ensuring the reliable power supply and self-healing function of the distribution network. The whole process of fault handling (that is, the FLISR process) is highly dependent on reliable information systems. It may cause inaccurate fault location, uncontrollable feeder switch, etc., which will directly affect the consequences of fault handling

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