计及二次侧开关开路故障的半有源桥变换器多模式容错运行策略

doi:10.19595/j.cnki.1000-6753.tces.230073

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摘要半有源桥（S-DAB）变换器广泛适用于电动汽车充电、光伏发电等仅需单向功率流的多种场景。针对二次侧开关开路故障,为了提高S-DAB的可靠性,需要采取容错运行策略抑制故障电流保证高可靠性运行。该文分析S-DAB正常运行模式的工作原理。在此基础上,提出S-DAB变换器二次侧开关发生开路故障时故障诊断与容错单有源桥（SAB）运行方法。所提出的故障诊断策略只需要一个额外的电压传感器能够识别二次侧故障开关位置。在实现故障定位后,基于所提容错SAB方法,能够保证开路故障后,变换器仍具备一定的功率传输能力。所提方法能够以较低的成本提高变换器容错运行的可靠性。实验结果验证了所提出的故障诊断策略与容错SAB模式的有效性。

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关键词 ：半有源桥（S-DAB）变换器, 开路故障, 故障诊断, 容错运行, 可靠性

Abstract：Semi-dual active bridge (S-DAB) converter is widely applied for scenarios requiring unidire- ctional power flow, such as electric vehicle charging and PV generation. Considering that the secondary side switch open-circuit fault of the S-DAB converter may threaten the normal operation of the system, the S-DAB converter should be able to maintain uninterrupted operation after a fault. This paper presents a fault diagnosis and fault-tolerant method for the S-DAB converter under open-circuit fault.
When an open-circuit fault occurs in the secondary side switch of the S-DAB converter, the current flow path is changed, leading to an abnormal state of the circuit, including a DC bias generated by the transformer current and a significant change in the periodic average of the AC voltage on the secondary side bridge at the moment of an open-circuit fault. Therefore, a fault diagnosis system based on voltage measurement is designed. The proposed strategy requires only one additional voltage sensor to identify the location of the fault switch, improving the reliability of the S-DAB converter at a low cost.
According to the previous analysis, the circuit topology is no longer symmetrical when an open-circuit fault occurs in the secondary side switch of the S-DAB converter, causing DC bias of leakage current. To eliminate DC bias, a fault-tolerant single active bridge (SAB) operation method is proposed. Specifically, after an open-circuit fault occurs in any switch on the secondary side of the S-DAB converter, the driving signal of the other switch is blocked. As a result, the secondary bridge is transformed into a diode bridge, forming a symmetrical circuit structure. Based on the proposed fault-tolerant SAB mode, the DC component of the leakage current caused by the fault switch can be eliminated. The potential damage caused by excessive current can be avoided, effectively ensuring the safe operation of the switch, capacitor, and inductor components of the circuit. Furthermore, the S-DAB converter still has a specific power transfer capability after the fault-tolerant operation.
An experimental prototype is built. The normal operation, open-circuit fault operation, and fault-tolerant operation of the S-DAB converter are experimentally verified. According to the experimental results, the proposed fault diagnosis strategy and fault-tolerant method can accurately locate and remove open-circuit faults within four cycles and promote the reliability tolerance of the S-DAB converter.

Key words： Semi-dual active bridge (S-DAB) converter open-circuit fault fault diagnosis fault-tolerant operation reliability

收稿日期: 2023-01-18

PACS:

TM46

基金资助:国家自然科学基金智能电网联合基金资助项目（U2166216）

通讯作者: 马建军男,1992年生,助理教授,研究方向为电力电子化电力系统、新能源并网、能量路由器等。E-mail: j.j.ma@sjtu.edu.cn

作者简介: 管硕男,1998年生,硕士研究生,研究方向为高可靠性DC-DC变换技术。E-mail: gs5973989@mail.shiep.edu.cn

引用本文:

管硕, 马建军, 朱淼, 张德桢. 计及二次侧开关开路故障的半有源桥变换器多模式容错运行策略[J]. 电工技术学报, 2024, 39(6): 1843-1858. Guan Shuo, Ma Jianjun, Zhu Miao, Zhang Dezhen. Multi-Mode Fault-Tolerant Operation Strategy of Semi-Dual Active Bridge Converter Considering Open-Circuit Fault of the Secondary Side Switch. Transactions of China Electrotechnical Society, 2024, 39(6): 1843-1858.

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