A fault diagnosis method for ground faults between CHB-BESS modules based on loss characteristic matrix

doi:10.19799/j.cnki.2095-4239.2023.0811

Abstract

Abstract:

Battery energy storage systems based on cascaded H bridges are prone to grounding faults between modules, and reducing such fault losses requires rapid and accurate determination of the fault location. The electrical characteristics of the fault are related not only to the location of the fault but also to the ground transition resistance. To rapidly and accurately locate the fault module under conditions of uncertain grounding transition resistance, we propose a fast fault diagnostic method based on the loss characteristic matrix. First, a zero-sequence equivalent circuit model is established, and then the zero-sequence current model is discretized. Finally, a fault diagnostic method is developed based on the loss characteristic matrix. In this method, the topological matrix describes the traversal information of the fault location and the transition resistance. The zero-sequence current is calculated based on the discretized model, and the difference between the calculated and measured results is recorded in the loss characteristic matrix. This study further confirms that the fault location has a unique optimal solution, and given an uncertain ground transition resistance, the deviation optimal solution still accurately locates the fault. Based on convergence, this paper also proposes an acceleration method based on optimization calculations. The experimental results show that the average position given by the proposed method errs by only 0.2 submodules, which means that the fault position is accurately determined when the grounding transition resistance is highly uncertain. In addition, the diagnostic speed was significantly improved.

Key words: CHB-BESS, grounding failure between modules, fault diagnosis, loss characteristic matrix, optimization calculation

CLC Number:

TM 73

Zhihao LIU, Yiqun GAO, Jun ZHANG, Zhibin LING, Xuguang LI. A fault diagnosis method for ground faults between CHB-BESS modules based on loss characteristic matrix[J]. Energy Storage Science and Technology, 2024, 13(3): 850-857.

Figures/Tables 8

Fig. 1

Fig. 2

Fig. 3

Table 1

CHB-BESS parameters"

参数名称	参数值
额定电压 $U N$	380 V
额定功率 $S N$	6.6 kW
单相子模块数量 $N$	16
电池电压 $U d c$	24 V

Table 1

Table 2

Equivalent circuit parameters"

参数名称	参数值
$R 1$	$0.1 Ω$
$L 1$	$0.8 m H$
$C 0$	$0.6 μ F$
$R m$	$0.15 Ω$
$L m$	$4 m H$

Table 2

Fig. 4

Table 3

Experimental result"

接地位置	接地电阻 $33 Ω$ 诊断结果	接地电阻66 $Ω$ 诊断结果	结果接地电阻130诊断	接地电阻 $330 Ω$ 诊断结果
1	1	1	1	1
4	4	4	4	4
8	8	8	8	8
12	12	11	11	10
16	16	16	16	16

Table 3

Table 4

Comparison of different methods"

方法	平均定位误差/个子模块	平均诊断时间/s	使用数据量	可解释性	迁移能力
本工作方法	0.2	0.51	0	有	有
遍历计算( $∆ r = 50 Ω$ )	0.6	5.40	0	有	有
SVM	0.5	0.01	256	无	无

Table 4

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