Reliability assessment of SLCC DC transmission system based on GO-DBN

doi:10.11930/j.issn.1004-9649.202509044

Abstract

Abstract:

The multi-source adaptive multi source adaptive statcom and line commutation converter (SLCC) significantly reduces the probability of commutation failure. DC transmission systems based on SLCC offer higher transmission efficiency and improved stability, and have now progressed to physical engineering implementation. It is therefore essential to evaluate the reliability of SLCC-based DC transmission systems to provide theoretical support and reference for their safe operation and maintenance. In this study, reliability parameters of components such as the three-phase static reactive power compensation and static var & filter (SVF) are calculated using the frequency and duration method. A reliability evaluation model based on the (goal oriented, GO) method is proposed and integrated with dynamic bayesian network (DBN) to assess the reliability of the SLCC DC transmission system. The time-varying curve of system energy availability is derived, verifying the feasibility and effectiveness of the proposed model and method for reliability evaluation of SLCC DC transmission systems.

Key words: SLCC DC transmission system, reliability assessment, dynamic bayesian network

SHEN Xiaolin, DU Shangan, LIANG Chenguang, WU Fangjie, JI Yiming, CUI Dawei. Reliability assessment of SLCC DC transmission system based on GO-DBN[J]. Electric Power, 2026, 59(6): 202-210.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202509044

https://www.electricpower.com.cn/EN/Y2026/V59/I6/202

Figures/Tables 15

Fig.1 Main electrical connection of SLCC DC transmission system

Fig.2 Logical relationship of SLCC DC transmission system

Fig.3 Topology of SLCC converter

Fig.4 SVF valve state transition model

Fig.5 Two-state equivalent model of SVF valve

Table 1 Reliability parameters of SVF valve arms

故障率λ/ (次·年^–1)	维修时间/h	修复率μ/ (次·年^–1)	安装时间/h	安装率γ/ (次·年^–1)
0.031 25	18.00	486.667 00	0.75	11 680

Table 2 Reliability parameters of SVF valves

λ_SVF/(次·年^–1)	μ_SVF/(次·年^–1)	能量可用率/%	总等值停运时间/h
0.093 75	467.200 30	99.979 9	1.760 76

Table 3 Reliability parameters of operators of SLCC DC transmission system

单元元件	故障率λ/(次·年^–1)	平均修复时间/h
送端母线	0.000 0	—
交流滤波器	0.083 3	11.70
控保系统	1.309 5	8.80
换流变压器	0.030 9	25.00
LCC阀臂	0.031 3	18.75
直流滤波器	0.050 0	13.55
输电线路	0.661 3	10.36
SVF阀	0.093 8	18.80

Table 4 GO graph operator types and their functions

操作符类型	功能	操作符类型	功能
1	两状态单元	2	“或”
5	信号发生器	10	“与”

Table 5 GO graph operator number and its name

操作符编号	单元名称	操作符编号	单元名称
1	送端母线	2	交流滤波器
3, 4	控保系统	6, 7, 18, 19	换流变压器
8, 9, 14, 15	LCC阀臂	11	直流滤波器
12, 13	线路	16, 17	SVF阀
20, 21	启动回路	5	或门
10, 22	与门

Fig.6 GO diagram of SLCC DC transmission system

Fig.7 DBN model of SLCC DC transmission system

Fig.8 Energy availability of SLCC DC transmission system

Fig.9 Availability rate of system equivalent efficiency under equal time maintenance operation

Fig.10 Availability rate of system equivalent power at a set threshold

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