Input Current-Based Diagnosis Scheme for Power Transistor Open-Circuit Faultin Traction Converter

doi:10.11985/2016.05.002

Abstract

Abstract:

In this paper, a novel method for fault diagnosis and location of traction converter for AC/DC drive is presented. This scheme compares the input current of the system under normal and fault condition. The fault state is obtained by the distinction and the fault location is identified by the fault diagnosis table. The diagnosis variable is the polarity of current error, eliminating the complicated calculations and avoiding the influence of load variation on the current. The fault detection device is simple, which can be directly included in the existing converter system without any increase of system complexity. The digital signal of fault diagnosis is achieved by using simple hardware, which significantly improves the ease of maintenance on the traction converter . The proposed method has a short diagnosis time, and it took only two fundamental periods to determine the diagnostic results. The simulation model is established in Matlab/Simulink software platform, and the effectiveness of the fault diagnosis method is verified by experiments.

Key words: Converter, fault diagnosis, fault location

CLC Number:

TM46

Chen Yitian,Chen Tefang,Cheng Shu,Chen Gaohua,Wang Han. Input Current-Based Diagnosis Scheme for Power Transistor Open-Circuit Faultin Traction Converter[J]. Journal of Electrical Engineering, 2016, 11(5): 11-20.

Figures/Tables 20

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故障管周期	T₁
正常	a₂→VD₃→VT₄→x₁→a₁→VD₁→VT₆→x₂
VT₁	~
VT₂	~
VT₃	~
VT₄	a₂→VD₃→VT₂→b₁→a₁→VD₁→VT₆→x₂
VT₅	~
VT₆	VD₃→VT₄→x₁→a₁→VD₁→VD₄
VD₃	VT₅→VT₄→x₁→a₁→VD₁→VT₆
VD₄	~
VD₁	a₂→VD₃→VT₄→VT₃→VT₆→x₂
VD₂	~
故障管周期	T₂
正常	x₂→VT₅→VD₂→a₁→b₁→VT₁→VD₄→a₂
VT₁	x₂→VT₅→VD₂→VD₁→VD₄→a₂
VT₂	~
VT₃	~
VT₄	~
VT₅	VD₃→VD₂→a₁→b₁→VT₁→VD₄
VT₆	~
VD₃	~
VD₄	VT₅→VD₂→a₁→b₁→VT₁→VT₆
VD₁	x₂→VT₅→VD₂→a₁→x₁→VT₃→VD₄→a₂
VD₂	x₂→VT₅→VT₄→VT₁→VD₄→a₂
故障管周期	T₃
正常	x₂→VT₅→VD₂→a₁→x₁→VT₃→VD₄→a₂
VT₁	~
VT₂	~
VT₃	x₂→VT₅→VD₂→a₁→b₁→VT₁→VD₄→a₂
VT₄	~
VT₅	VD₃→VD₂→a₁→x₁→VT₃→VD₄
VT₆	~
VD₃	~
VD₄	VT₅→VD₂→a₁→x₁→VT₃→VT₆
VD₁	~
VD₂	x₂→VT₅→VT₄→VT₃→VD₄→a₂
故障管周期	T₄
正常	a₂→VD₃→VT₂→b₁→a₁→VD₁→VT₆→x₂
VT₁	~
VT₂	a₂→VD₃→VD₂→VD₁→VT₆→x₂
VT₃	~
	（续）
故障管周期	T₄
VT₄	~
VT₅	~
VT₆	VD₃→VT₂→b₁→a₁→VD₁→VD₄
VD₃	VT₅→VT₂→b₁→a₁→VD₁→VT₆
VD₄	~
VD₁	a₂→VD₃→VT₂→VT₃→VT₆→x₂
VD₂	a₂→VD₃→VT₄→x₁→a₁→VD₁→VT₆→x₂

故障管周期	i₁				i₂
电流	T₁	T₂	T₃	T₄	T₁	T₂	T₃	T₄
正常	+	-	-	+	+	-	-	+
VT₄	+	-	-	+	+	-	-	+
VT₃	+	-	-	+	+	-	-	+
VT₁	+	-	-	+	+	0	-	+
VT₂	+	-	-	+	+	-	-	0
VD₂	+	-	-	+	+	+	0	+
VD₁	+	-	-	+	0	-	-	-
VT₆	0	-	-	0	+	-	-	+
VT₅	+	0	0	+	+	-	-	+
VD₄	+	0	0	+	+	-	-	+
VD₃	0		-	0	+	-	-	+

故障管周期	i₃				i₄
电流	T₁	T₂	T₃	T₄	T₁	T₂	T₃	T₄
正常	+	0	-	0	+	0	0	+
VT₄	0	0	-	0	+	0	0	+
VT₃	+	0	0	0	+	0	0	+
VT₁	+	0	-	0	+	0	0	+
VT₂	+	0	-	0	+	0	0	+
VD₂	+	+	0	0	+	0	0	+
VD₁	0	0	-	+	+	0	0	+
VT₆	+	0	-	0	+	0	0	+
VT₅	+	0	-	0	+	+	+	+
VD₄	+	0	-	0	+	0	0	+
VD₃	+	0	-	0	0	0	0	0

VT₁?VT₆	BTA16-600B
VD₁?VD₄	RHRP3060
75R/76R	RxQ-100-750ΩJ
11L/12L	0.028H
变压器	220V/190V X2,其一带中间抽头
电机	Z2-42（340V/4kW）

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