摘要
对于核电站频繁发生的多相旋转整流器开路故障,实际现场不仅需要可靠诊断,还需要对故障模式进行准确区分。利用故障在励磁机定子励磁电流中反映的特征来诊断无法被直接测量到的旋转整流器故障是一种有效的途径,但是以往研究均仅关注故障励磁电流的频域特征,能识别故障的发生而无法进一步对故障模式进行分类。为此,该文对旋转整流器一管开路、一相开路以及不同位置的两相开路故障后励磁电流时域、频域及频谱分布特征进行研究。首先,对某11相环形无刷励磁系统的运行特性进行理论分析,基于二极管导通顺序及故障二极管在电机运行周期中所处的位置,对故障励磁电流时域特征进行分析;其次,基于故障对励磁电流的影响机理,对励磁电流故障分量进行解析,得到了旋转二极管不同模式故障下的频域及频谱分布特征,并通过某11相动模样机实验验证了理论分析的正确性;最后,结合励磁电流时域、频域以及频谱分布三者特征,提出了二极管不同模式故障的诊断方法。样机实验表明,该文提出的诊断方法能实现所有故障模式的区分,可为一般多相环形无刷励磁系统旋转整流系统故障的保护提供依据。
The excitation system with a multi-phase annular brushless exciter(MPABE)is widely used in large-capacity nuclear power plants.However,the rectifier open-circuit fault caused by diodes or fuses damage often occurs in field operation.The fault types can be classified as one-tube open-circuit fault,one-phase open-circuit fault,and two-phase open-circuit fault.The actual site needs to reliably diagnose the open-circuit fault occurrence of multi-phase rotating rectifiers and accurately distinguish the fault modes.Since the field winding of the exciter is located at the stator and the rectifier rotates with the rotor at high speed,the rectifier fault cannot be monitored directly.Therefore,it is an effective way to diagnose the rotating rectifier fault using the excitation current characteristics.Hence,this paper analyzes the rectifier fault mechanism and proposes a new rectifier open-circuit fault diagnosis method based on the time-frequency characteristics of the fault excitation current.Firstly,the operation mechanism of an 11-phase annular brushless excitation system is analyzed theoretically.Based on the diode conduction sequence and the position of the fault diode in the motor operation period,the time-domain waveform of the fault excitation current is analyzed.Secondly,based on the influence mechanism of the fault diode on excitation current,the fault component of excitation current is analyzed,and the frequency-domain characteristics and spectrum distribution of one-tube open-circuit,one-phase open-circuit and two-phase open-circuit of the rotating diode are obtained.The experiments were carried out on a particular 11-phase exciter prototype.The theoretical analysis is consistent with the prototype experimental results.Finally,based on the combination of time-domain,frequency-domain,and spectrum distribution characteristics of exciter stator excitation current,a new fault diagnosis method of rotating rectifier open-circuit fault in MPABE is proposed for the rectifier one-tube open-circuit fault,one-phase open-c
作者
郝亮亮
陈建林
段贤稳
何力
陈俊
Hao Liangliang;Chen Jianlin;Duan Xianwen;He Li;Chen Jun(School of Electrical Engineering Beijing Jiaotong University,Beijing 100044 China;China Nuclear Power Operation Co.Ltd,Shenzhen 518172 China;Yangjiang Nuclear Power Co.Ltd,Yangjiang 529941 China;Nanjing NR Electric Co.Ltd,Nanjing 211102 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第18期4932-4946,共15页
Transactions of China Electrotechnical Society
基金
中央高校基本科研业务费专项资金项目(2021YJS153,2020JBM070)
中广核集团公司科技项目(3100077013)资助。
关键词
多相环形无刷励磁机
整流器故障
励磁电流
时域
频域
频谱分布
Multi-phase annular brushless exciter
rectifier fault
excitation current
time-domain
frequency-domain
spectral distribution
