PC三电平逆变器电解电容故障特征分析

doi:10.16180/j.cnki.issn1007-7820.2022.05.013

摘要/Abstract

摘要：

针对目前NPC三电平逆变器电解电容故障特征难以提取的问题,提出变分模态分解与模态能量结合的故障特征提取方法。该方法通过采集NPC三电平逆变器输出端的电流信号,结合参考电流信号,求取电流的偏差信号。根据电流偏差信号频率分布的特点,用模态重复率对VMD的分解尺度进行参数寻优。利用VMD对电流偏差信号分解,得到具有中心频率的有限带宽的模态分量。根据模态分量的信息熵确定能表征电容故障的特征分量,进而计算特征分量的模态能量,构造特征向量,寻求特征变化规律,并对其进行分类。结果表明,此方法能够准确地反映出电解电容的工作状态。

关键词: NPC三电平逆变器, 变分模态分解, 电解电容, 模态能量, 模态重复率, 信息熵, 偏差信号, 中心频率

Abstract:

In view of the problem that it is difficult to extract the fault features of electrolytic capacitor in NPC three-level inverter, a fault feature extraction method based on variational mode decomposition and modal energy is proposed. By collecting the output current signal of NPC three-level inverter and combining with the reference current signal, the current deviation signal is obtained. According to the characteristics of frequency distribution of current deviation signal, the decomposition scale of VMD is optimized by modal repetition rate. The VMD is employed to decompose the current deviation signal to obtain the limited bandwidth modal component with the center frequency. According to the information entropy of the modal component, the characteristic component which can represent the capacitor fault is determined. Then the modal energy of the characteristic component is calculated, the characteristic vector is constructed, and the characteristic variation rule is sought and classified. The results show that this method can accurately reflect the working state of electrolytic capacitor.

Key words: NPC three level inverter, variational mode decomposition, electrolytic capacitor, modal energy, modal repetition rate, information entropy, deviation signal, center frequency

中图分类号:

TP29

王新,黄冲,许翔. PC三电平逆变器电解电容故障特征分析[J]. 电子科技, 2022, 35(5): 81-86.

WANG Xin,HUANG Chong,XU Xiang. Parametric Fault Characteristics Analysis of Electrolytic Capacitor in NPC Three Level Inverter[J]. Electronic Science and Technology, 2022, 35(5): 81-86.

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故障模式	故障编号	C₁退化范围	C₂退化范围
正常	f₀	0~10	0~10
C₁单故障	f₁₁	10~20	0~10
C₁单故障	f₁₂	20~30	0~10
C₂单故障	f₂₁	0~10	10~20
C₂单故障	f₂₂	0~10	20~30
C₁和C₂双故障	f₃₁	10~20	10~20
	f₃₂	10~20	20~30
	f₃₃	20~30	10~20
	f₃₄	20~30	20~30

故障编号	区域
f₀	(9.0124,10.3766)
f₁₁	(11.3477,13.0386)
f₁₂	(17.6594,20.0713)
f₂₁	(11.4476,13.8611)
f₂₂	(17.8842,20.3288)
f₃₁	(11.4513,13.2142)
f₃₂	(14.8223,17.2572)
f₃₃	(14.3399,16.8424)
f₃₄	(16.6393,18.5343)