Method for diagnosing failure of hydraulic variable-pitch system of wind turbine generator based on fuzzy Petri net

Abstract

A method for diagnosing the failure of a hydraulic variable-pitch system of a wind turbine generator based on a fuzzy Petri net belongs to the field of technologies for diagnosing the failure of the hydraulic variable-pitch system of the wind turbine generator. The method comprises the following steps of determining a top event, then finding the direct reason of the event, and so forth finding the most basic reason causing the failure of the system to establish a failure Petri net model of the hydraulic variable-pitch system; acquiring the attainable set and the like of all failure libraries of the hydraulic variable-pitch system according to the relationship among all the libraries; and analyzing the immediately attainable set and the like of the failure libraries, determining failure reasons and the credibility of the failure libraries according to fuzzy production rules, transition trigger rules and a fuzzy inference algorithm and realizing the failure diagnosis of the hydraulic variable-pitch system of the wind turbine generator. The method has the advantages that the failure diagnosis of the hydraulic variable-pitch system of the wind turbine generator is realized, leaked judgment, wrong judgment and incapable judgment problems in the diagnosis of the hydraulic variable-pitch system are effectively solved, a failure possibility value can be quantitively given, and the diagnosis correct rate is increased. The method has positive meaning in the failure diagnosis of the hydraulic variable-pitch system of the wind turbine generator.

Description

technical field [0001] The invention relates to a fuzzy Petri net-based fault diagnosis method for a hydraulic pitch system of a wind turbine, and belongs to the technical field of fault diagnosis for a hydraulic pitch system of a wind turbine. Background technique [0002] With the crisis of energy and environment, wind power generation, as a form of renewable energy power generation, has received widespread attention from all countries. Improving the technical level and manufacturing capacity of my country's wind power equipment, reducing the cost of wind power generation, enhancing its market competitiveness, and reducing the operating cost of wind farms are the common wishes of all major wind turbine manufacturers and operators in my country. The single-unit capacity of wind turbines is increasing with the continuous expansion of wind power development, but frequent failures shorten the average annual power generation time of the units and lengthen the maintenance time o...

AI Technical Summary

Problems solved by technology

However, once the hydraulic system of a high-power wind turbine fails, it is difficult to repair

Images