State-monitoring-based repairing method for relay protection system of intelligent substation

Abstract

According to actual engineering requirements on state repairing of a relay protection system of an intelligent substation, the invention puts forward a state-monitoring-based repairing method for a relay protection system of an intelligent substation. According to an operation state score of an element, whether the element is in a normal working condition or an abnormal condition is determined; with consideration of the influence of a service age repairing roll back, a degradation threshold (DT) model based on a long-term evolution rule and a degradation shock (DS) model based on a short-termsudden change rule are established respectively; and then a comprehensive risk model of the relay protection system is established by combining the configuration situation of the protection system andthen repairing strategy plans of all elements of the relay protection system are made. Therefore, actual needs of state repairing of the relay protection system of the intelligent substation are met.

Description

technical field [0001] The technical field of the electric power system of the present invention is specifically a kind of maintenance method of the intelligent substation relay protection system based on state monitoring. Background technique [0002] Relay protection is an important part of smart substation, and its normal operation has a very important impact on the operation of the power system. With the continuous development of condition monitoring methods such as protection devices and communication systems, the implementation of condition-based maintenance for relay protection systems in smart substations has become an important means to improve the reliability of relay protection systems and reduce the probability of equipment failure. An important direction for the construction of electrical protection systems. At present, most of the research on condition-based maintenance of relay protection systems in smart substations is qualitative analysis, and research on q...

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Problems solved by technology

[0003] [State Grid, "Guidelines for Condition-Based Maintenance of Relay Protection Systems" [Z]: 2014], using the method of scoring secondary equipment to give the program of condition-based maintenance of computer-based relay protection devices, but the scoring method of this program It does not combine the actual rules of equipment failure or abnormal operation, and the maintenance time given by it is also rough, which is likely to cause the phenomenon of "over-inspection" or "under-inspection"; [Ding Maosheng, Wang Gang, He Wen. Based on reliability economics Analysis of the optimal maintenance interval of relay protection[J]. Chinese Journal of Electrical Engineering, 2007, 27(25):44-48], this document proposes an optimal maintenance interval scheme for relay protection based on reliability and economy , established a state space model for single protection and two protections, but this literature did not consider the multi-component characteristics and condition-based maintenance strategy of the smart substation relay protection system. When there are many equipment states, there will be a state combination space explosion problem; [ Li Ming, Han Xueshan, Wang Yong, etc. Decision-making model and solution of substation condition-based maintenance [J]. Chinese Journal of Electrical Engineering, 2012, 32(25): 196-202], this document proposes to use genetic algorithm to solve substation based on condition-based maintenance results The minimum economic loss determines the condition-based maintenance strategy, but this method is not universal for relay protection systems

[0004] In summary, the existing condition-based maintenance schemes of relay protection systems are easy to apply in engineering, but there are also prominent problems that the equipment maintenance cycle cannot be directly determined, and it is difficult to give full play to the advantages of condition-based maintenance technologies, while other condition-based maintenance methods are not suitable for smart substation relays. electrical protection system

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