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

Abstract

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

CLC Number:

TP29

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.

Figures/Tables 10

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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)

Parametric Fault Characteristics Analysis of Electrolytic Capacitor in NPC Three Level Inverter

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