利用FMECA法的兆瓦级风力机故障模式分析

Failure Mode Analysis of MW Scale Direct-Drive Permanent Magnet Wind Power Generator Based on FMECA Method

在分析1.5 MW永磁直驱风力发电机系统的结构组成基础上,建立了永磁直驱风力发电机的功能框图以及任务可靠性逻辑框图。针对风力发电机组关键工作部分的风轮、变桨系统、偏航系统、永磁同步发电机、机舱底座、塔架、测风共7个子系统,利用FMECA法对其进行故障模式分析。根据风电场内永磁直驱风机的运营和故障维护数据,归纳统计了各机组子系统可能的故障模式,并对每个故障模式进行了故障原因、故障影响以及危害度分析,对每个故障模式进行了风险等级评价,找出风机薄弱环节,得到FMECA分析结果表,为后续子系统的可靠性分配以及后期风力发电机组运行维护过程中的故障监测和诊断提供了参考。

The function frame diagram and the mission reliability diagram of direct-drive wind generator are established based on the structural analysis of a 1.5 MW direct-drive permanent magnet wind power generator. For 7 key subsystems of wind power generator including wind wheel, pitch system, yaw system, permanent magnet synchronous generator, wind turbine set, tubular tower and wind direction ＆ speed detection system, the failure mode analysis is conducted based on FMECA. According to the operation and failure maintenance data from a wind farm, this study summarizes the possible failures of each subsystem and conducts the failure cause analysis, the failure effect analysis and the criticality analysis. Meanwhile, reliability＇s weak links are detected by con- ducting the risk evaluation for all failure modes and the FMECA results of direct-drive wind power generator are gained, which might provide reference for the distribution of system reliability, failure monitoring and diagnosis in operation.