Ultrahigh-voltage circuit relaying protection system reliability assessment method with covert faults taken into consideration

Abstract

The invention belongs to the field of relaying protection device reliability assessment and relates to an ultrahigh-voltage circuit relaying protection system reliability assessment method with covert faults taken into consideration. An ultrahigh-voltage circuit relaying protection system is provided with two sets of main protection devices and a set of backup protection devices. According to the reliability assessment method, at first, every single protection system is assessed, and then the whole protection system is assessed. According to assessment of the single protection system, the state space of a single protection device is determined, the states comprise the normal operation state, the off-line state of a protected element, the off-line state of a protecting element, the operation state with the covert maloperation fault hidden danger, the operation state with the covert rejection hidden danger, the protected element and protecting element off-line operation state with the covert maloperation hidden danger, and the simultaneous off-line state of the protected element and the protecting element, a state space model is set up, a markov transition matrix corresponding to the model is determined, and the probability value of each state is obtained. By means of the method, the relaying protection device can be assessed more accurately and reliably in real time.

Description

Technical field [0001] The invention relates to the field of reliability evaluation of relay protection systems, and relates to a reliability evaluation method for ultra-high voltage line relay protection systems considering hidden faults. Background technique [0002] The reliability assessment of power system has been concerned as early as the 1980s, but so far, the relevant research at home and abroad has mainly focused on the primary system, and there are relatively complete assessment methods from equipment to system, while secondary The reliability assessment of the system is mostly conceived from the perspective of security defense, and the research on the overall risk assessment of the secondary system is relatively lacking. At present, most of the existing theoretical achievements in the reliability evaluation of relay protection systems are based on the Markov method and fault tree method. The impact of faults and system operating state changes, and the analysis a...

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Problems solved by technology

[0002] The reliability assessment of power system has been concerned as early as the 1980s, but so far, the relevant research at home and abroad has mainly focused on the primary system, and there are relatively complete assessment methods from equipment to system, while secondary The reliability assessment of the system is mostly proposed from the perspective of security defense, and there is a lack of research on the overall risk assessment of the secondary system

At present, most of the existing theoretical achievements in the reliability evaluation of relay protection systems are based on the Markov method and fault tree method. The impact of faults and system operating state changes, and the analysis and calculation process is very complicated when evaluating the reliability of relay protection systems with a large number of states, which greatly limits the application of these reliability evaluation methods

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