An Online Diagnostic Method for Rotary Diode Open-Circuit Faults in Brushless

被引：28

作者：

Wu, Yucai ^{[1
]}

Cai, Bochong ^{[1
]}

Ma, Qianqian ^{[1
]}

机构：

[1] North China Elect Power Univ, Dept Elect Engn, State Key Lab Alternate Elect Power Syst Renewabl, Baoding 071003, Peoples R China

来源：

IEEE TRANSACTIONS ON ENERGY CONVERSION | 2018年 / 33卷 / 04期

关键词：

Brushless exciter; rotating diode; open circuit; magnetic field detection coil; harmonics; diagnosis;

D O I：

10.1109/TEC.2018.2831241

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Arotating diode failure is themost common electrical fault in brushless exciters. It brings a safety hazard to the generator excitation system so that the whole unit is forced to be shut down. It is necessary to detect and deal with this fault accurately. According to the electrical structure characteristics of brushless exciters, this paper analyzes the influence of an open circuit rotating diode on the armature current and armature magnetic field. It is proposed here that we install the magnetic field detection coil on the stator yoke and use the rotational frequency component in the induced voltage to diagnose the open circuit fault in the rotating diode online. In this paper, a two-dimensional model of a 22-pole 39-phase brushless exciter is established, and the new detection method is verified using a finite element simulation. This provides a new solution for rotating diode fault diagnosis in brushless exciters. The detection method exhibits good performance in terms of practicability, real-time usage, and versatility.

引用

页码：1677 / 1685

页数：9

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