Wind-farm reliability evaluation method of considering wind-turbine transmission system fatigue

Abstract

The invention relates to a wind-farm reliability evaluation method, and particularly to a wind-farm reliability evaluation method of considering wind-turbine transmission system fatigue. The method solves the problem that risks cannot be accurately evaluated by existing evaluation methods, and includes the steps of: 1, generating a historical fatigue load time sequence and a fatigue load spectrumof turbines; 2, generating a shafting material performance S-N curve; 3, carrying out fatigue analysis on turbine shafting; 4, establishing a shafting fatigue failure rate model; 5, establishing a Markov model of considering the transmission system fatigue; and 6, using a Monte Carlo method for reliability analysis. The method of the invention has the advantage that possibility that fatigue damageof traditional turbine shafting causes a turbines outage and occurrence probability and caused consequences thereof are considered when it is determined that the turbines are in running or outage status, thus a more accurate turbine outage probability model according with reality is provided in turbine reliability modeling, then accuracy of wind-power reliability evaluation is significantly improved, and an analysis result can be indirectly used for guiding of wind-farm overhaul plans and running plans.

Description

technical field [0001] The invention relates to a reliability evaluation method of a wind farm, in particular to a reliability evaluation method of a wind farm considering the fatigue of a transmission system of a wind turbine. Background technique [0002] With the rapid growth of wind power grid-connected capacity, wind power generation poses increasingly severe challenges to the reliable operation of power systems. For a long time, the fatigue problem of the mechanical transmission system of wind turbines has been a major problem in the field of wind power. Wind turbines are usually installed in remote areas with rich wind energy resources, where the natural environment is relatively harsh. Large wind turbine cabins are usually installed on the top of the tower, and the internal space is small. Once the equipment parts fail, it will be very difficult to repair. At the same time It will also result in longer downtime for failures. According to statistics, the failure rat...

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Problems solved by technology

[0003] The present invention solves the problem that the existing wind farm reliability evaluation method cannot accurately reflect the relationship between the real "age" of the components and the failure rate, ignores the differences in the operating conditions and use intensity of different units, and fails to combine the reliability evaluation in the electrical field with the failure rate. Fatigue analysis in the mechanical field is organically combined, and it is impossible to predict the risk of wind power grid-connected by mechanical fatigue. A wind farm reliability evaluation method that takes into account the fatigue of the wind turbine drive system is provided.

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