A Deterioration Assessment Method for Hydroelectric Units Based on Bathtub Failure Curve

Abstract

The invention discloses a bathtub failure curve based hydroelectric unit deterioration evaluation method. The method takes full account of a bathtub failure path of a unit from installation to final extended service. Three different deterioration models are adopted to evaluate single indicators, so that early, middle and late deterioration degrees of the unit can be accurately characterized by different indicators of the unit. Meanwhile, family defects, inspection records and other site data are considered, and variable-weight weighted calculation is performed on indicators of various aspects, so that the comprehensive deterioration degree and grade of the unit are finally obtained, and maintenance decision and extended service running of the unit is guided. The method can effectively evaluate the deterioration degree of the hydroelectric unit, and has very good economic benefits and engineering values.

Description

technical field [0001] The invention relates to the field of state evaluation of hydroelectric units, in particular to a method for evaluating degradation of hydroelectric units based on bathtub failure curves. Background technique [0002] With the increasing calls for global response to climate change and the increasingly severe situation of energy shortage and energy supply security, hydropower, as a renewable energy source, is constantly improving its status in the energy strategies of various countries because of its clean, safe and sustainable characteristics. However, as the hydroelectric unit is affected by factors such as erosion, wear, and interactive stress during operation, the performance of each component will gradually degrade with the increase of service time. The reliability of its equipment performance has an important impact on the safety and stability of the power grid. If a failure occurs, it may cause the unit to be shut down for maintenance, thereby di...

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Problems solved by technology

The current assessment adopts a simple single limit value method, which does not conform to the actual deterioration of the unit

Secondly, in our country, the evaluation is mostly based on the vibration measurement results of the key points of the unit components, which does not include the characteristics of the unit’s initial design problems and gradual defect changes, and cannot fully reflect the comprehensive degradation degree of the hydropower unit.

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