三电平逆变器的开关管开路故障诊断策略

doi:10.16182/j.issn1004731x.joss.201808029

系统仿真学报 ›› 2018, Vol. 30 ›› Issue (8): 3058-3065.doi: 10.16182/j.issn1004731x.joss.201808029

三电平逆变器的开关管开路故障诊断策略

沈艳霞^1,2, 苗贝贝^1,2

1. 江南大学物联网技术应用教育部工程研究中心,江苏无锡 214122;
2. 江南大学电气自动化研究所,江苏无锡 214122

收稿日期:2016-11-02 出版日期:2018-08-10 发布日期:2019-01-08
作者简介:沈艳霞(1973-),女,山东,博士,教授,研究方向为新能源控制技术,电机非线性控制;苗贝贝(1993-),女,江苏,硕士生,研究方向为多电平逆变器的故障诊断。
基金资助:
国家自然科学基金(61573167,61572237)

Open Circuit Fault Diagnosis Strategy for Switch of Three Level Inverter

Shen Yanxia^1,2, Miao Beibei^1,2

1. The Internet of Things Technology Application Engineering Research Center of the Ministry of Education, Jiangnan University, Wuxi 214122, China;
2. Institute of Electrical Automation, Jiangnan University,Wuxi 214122, China

Received:2016-11-02 Online:2018-08-10 Published:2019-01-08

摘要/Abstract

摘要： 开关管故障诊断是实现三电平逆变器在开关管故障下系统可靠运行的前提。针对二极管中点钳位型(NPC)三电平逆变器的简单开路故障,提出了一种在线和离线诊断相结合的开路故障诊断方法。利用桥臂相电压的平均值进行故障相的检测,针对时域内可以区分的故障,利用负载相电压的最大值、最小值定位故障开关管,针对时域内难以区分的故障,经快速傅里叶变换(FFT)提取故障信号谐波的幅值,利用BP神经网络实现简单开路故障诊断。仿真验证该诊断方法,大大减少了对故障数据进行学习训练的工作量,提高了故障诊断的准确性。

关键词: NPC三电平逆变器, 开关管开路故障, 桥臂相电压平均值, 负载相电压最值, FFT, BP神经网络, 故障诊断

Abstract: Fault diagnosis of switch is the premise of reliable operation of three-level-inverter under the fault of the switch. Taking simple open circuit fault of the diode neutral point clamped (NPC) three level inverter as an example, the open circuit fault diagnosis method based on the combination of online and offline diagnoses is proposed. The fault phase is detected by the mean value of the bridge arm phase voltages. In the time domain, the fault switch tube is diagnosed by the maximum and minimum values of the load phase voltages. In the frequency domain, the amplitude of the fault signal is extracted by the fast Fourier transform (FFT), and the open circuit fault diagnosis of the NPC three-level-inverter is realized by using the BP neural network. Simulation results show that this method can greatly reduce the workload and improve the accuracy of fault diagnosis.

Key words: NPC three-level-inverter, open circuit faults of switches, bridge arm phase voltages mean value, load phase voltages maximum and minimum values, FFT, BP neural network, fault diagnosis

中图分类号:

TM464

沈艳霞, 苗贝贝. 三电平逆变器的开关管开路故障诊断策略[J]. 系统仿真学报, 2018, 30(8): 3058-3065.

Shen Yanxia, Miao Beibei. Open Circuit Fault Diagnosis Strategy for Switch of Three Level Inverter[J]. Journal of System Simulation, 2018, 30(8): 3058-3065.

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三电平逆变器的开关管开路故障诊断策略

Open Circuit Fault Diagnosis Strategy for Switch of Three Level Inverter

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