A condition-based maintenance method for power transmission equipment based on system risk

Abstract

The invention discloses a method for maintaining the state of power transmission equipment based on a system risk. The method comprises the following steps that: a control system calculates the forced stoppage rate of the power transmission equipment to be maintained under the current state; the control system calculates a risk increment which is brought to the system by the power transmission equipment to be maintained under the current state; the control system sequences the importance of the power transmission equipment to be maintained; the control system screens feasible maintenance timeintervals of the kth power transmission equipment to be maintained according to restraint conditions; the control system determines the optimum maintenance time interval of the kth power transmissionequipment to be maintained; the control system updates the forced stoppage rate and operating data of the kth power transmission equipment to be maintained after maintenance, wherein k is equal to k+1; and if maintenance schedules of all pieces of power transmission equipment to be maintained are made, the system ends operation, otherwise, the system repeatedly executes the operation. By the method, a new equipment importance evaluation index is provided and can reflect the current state of the equipment and influence size of the system risk. On the premise of an operating mode of a power system and the time sequence change of the state of the equipment, the total risk of the system in investigation time is minimized.

Description

technical field [0001] The invention relates to a power transmission equipment maintenance method, in particular to a system risk-based power transmission equipment condition maintenance method. Background technique [0002] With the development of society and economy, the demand for electricity has grown rapidly, and the scale of the power grid has expanded rapidly. The society has higher and higher requirements for the reliability of power grid power supply. Equipment maintenance is an important measure to ensure the reliability of power grid operation, and the rationality of its maintenance strategy is crucial to the safe and economical operation of the power system. According to whether to consider equipment status and equipment importance, maintenance strategies are divided into post-event maintenance, planned maintenance, condition-based maintenance and reliability-centered maintenance. [0003] After-event maintenance is to repair the equipment after it breaks down. ...

AI Technical Summary

Problems solved by technology

However, as the power system develops towards high-voltage levels, large-capacity transmission and the Internet, planned maintenance has the following disadvantages: First, as the scale of the power grid continues to expand, more and more equipment will be required. Second, due to the difference in equipment design and manufacturing levels and operating conditions, if the equipment is still repaired at a fixed scale at a fixed time, some equipment will have "overhaul" and cause a waste of maintenance resources. For some equipment, there will be "insufficient maintenance", because some early defects can be eliminated through early maintenance, so as to avoid the occurrence of failure; ③ some preventive tests require power failure, but important power equipment usually cannot be easily shut down, and The equipment state (such as temperature, voltage, etc.) after the power failure is inconsistent with the live operation, which affects the accuracy of the test results

[0007] Literature Endrenyi J, G.J.Anders, Bertling L, et al. Comparison of Two Methods for Evaluating the Effects of Maintenance on Component and System Reliability [C]. Iowa State University, Ames, Iowa, 2004: 307-312. and literature Bertling L , Allan R, Eriksson R.A Reliability-Centered Asset Maintenance Method for Assessing the Impact of Maintenance in Power Distribution Systems[J].IEEE Transactions on Power Systems, 2005, 20(1):75-82. The method of system reliability and operating cost impact adopts a logical route of system analysis-component analysis-system analysis: firstly, the importance of the equipment is sorted according to the system reliability sensitivity index, and then the most important equipment is calculated in different maintenance strategies. The failure rate of the system under different failure rates, and then calculate the system reliability index of the most important equipment under different failure rates, and finally obtain the equipment maintenance strategy with the highest system reliability or the lowest maintenance cost as the objective function. The shortcoming of this method is that the system During the analysis, only a typical operation mode of the system is considered, but in fact the power load changes with time, and this change factor should be considered

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