基于定子电流谐波法的无刷励磁机旋转二极管开路故障检测

The Detection of Open-circuit Fault of Rotary Diode in Brushless Exciter Using Stator Current Harmonic Method

旋转整流器是无刷励磁机的关键部件,同时也是无刷励磁机稳定运行时的薄弱环节。旋转二极管的开路故障是无刷励磁机的典型电气故障,给发电机励磁系统带来了安全隐患。本文根据无刷励磁机的电气结构特点,分析了旋转整流器的二极管一管开路对电枢磁场以及定子电流的影响,运用定子电流谐波法来检测无刷励磁机的旋转二极管开路故障。本文以22极39相无刷励磁机为例,通过有限元仿真验证了定子电流谐波法的检测性能。

Rotary rectifier is the key component of the brushless exciter, and it is also the weak point for the stable operation of the brushless exciter. The open-circuit fault of the rotating diode is a typical electrical fault of the brushless exciter, which brings security risks to the generator excitation system. According to the electrical structure characteristics of the brushless exciter, this paper analyzes the influence of the open-circuit fault of the diode of the rotary rectifier on the armature magnetic field and stator current, which uses the stator current harmonic method to detect the open-circuit fault of the rotary diode of the brushless exciter. A brushless exciter with 22 poles and 39 phases was taken as an example to verify the performance of the stator current harmonic method by the finite element simulation.