基于温度场的双馈异步发电机电刷滑环系统故障诊断模拟

Simulation on Fault Diagnosis of Brush and Slip Ring System in Doubly-Fed Induction Generators Based on Temperature Field

应用热电耦合原理,利用ANSYS有限元分析平台建立了双馈风力发电机电刷滑环系统温度场仿真模型,对正常运行状态下的电刷滑环系统温度场进行仿真,给出了系统各部件温度场及电流密度矢量分布。通过对模型中不同电刷加载大小不同的电流载荷来模拟电刷电流分布不均匀故障,对该故障进行暂态仿真分析,同时对刷环系统在正常运行状态下与故障运行状态下的热电场分布做了比较分析。最后,给出相关结论,对电刷滑环系统的温度场状态监测及其过热故障预期具有指导意义。

A temperature field model of brush and slip ring system in doubly-fed induction generator is established in this paper by using the ANSYS software based on the principle of thermoelectric coupling. The temperature field of brush and slip ring system is calculated with the finite element method under normal operating condition, and the temperature field and current density vector distribution of the various components in the system are obtained in the paper. Then, the uneven distribution fault of brush current is simulated by loading different currents onto different brushes, and a transient simulation analysis is carried out on the brush and slip ring system under fault state. The temperature field and electric field under fault condition are compared with that under normal condition. Finally, relevant conclusions are given, which can guide the state monitoring of the temperature field and overheating fault forecast of the brush and slip ring system.