三有源桥变换器开关开路故障诊断与容错运行策略
Fault Diagnosis and Tolerant Method of Open-circuit Fault for Triple Active-bridge DC-DC Converter
杨伟业 1马建军 2朱淼 3胡存刚 1文书礼 3刘碧1
作者信息
- 1. 安徽大学电气工程与自动化学院,安徽省 合肥市 230601
- 2. 上海交通大学国家电投智慧能源创新学院,上海市 闵行区 200240
- 3. 电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 闵行区 200240
- 折叠
摘要
作为一种典型多端口变换器,三有源桥(triple active bridge,TAB)DC-DC变换器广泛应用于分布式直流系统中,其开关器件开路故障将严重影响系统运行.为降低开关故障带来的影响,该文提出TAB变换器开路故障诊断方法与容错运行策略.首先,分析TAB变换器正常运行特性以及开关管开路故障暂态过程,提出利用TAB变换器各桥臂中点电压平均值实现开路故障定位.通过闭锁故障开关所在桥臂的驱动信号消除开路故障导致的直流偏置;然后,分析闭锁状态下TAB变换器的运行特性,确定能够保证TAB变换器实现开路故障容错运行的移相角范围,当开路故障发生于直流母线侧,调节移相角使得直流母线吸收功率,当开路故障发生于储能侧时,调节移相角使故障储能切除.实验结果验证所提方法可准确快速实现各开关管开路故障诊断,并实现容错运行,提升TAB变换器的可靠性.
Abstract
As a typical multiport converter,triple active-bridge(TAB)DC-DC converter is widely used in distributed DC system.The open-circuit fault(OCF)of TAB seriously threatens the system safety operation.This article proposed an OCF diagnosis and tolerant method for TAB converter to reduce the impact of OCF.Firstly,normal mode and OCF mode of TAB are analyzed.Base on the analysis,the average value of the midpoint voltage of each bridge arm can be used as an OCF diagnosis indicator.The DC bias of transformer winding current are eliminated by blocking the gate-driving signal of the faulty bridge arm.Then the blocking mode is analyzed.Finally,fault-tolerant operation is achieved by regulating the phase shift angle range.If the OCF occurs on the DC bus side,the phase shift angle is adjusted to ensure that the DC bus still absorbs power.If the OCF occurs on the energy storage side,the phase shift angle is adjusted to ensure that the energy storage cut off.The OCF can be diagnosed accurately and quickly according to the experimental results.The impact of OCF can be reduced,which promotes the reliability of TAB converters.
关键词
分布式直流系统/三有源桥变换器/开路故障/故障诊断/故障容错运行Key words
distributed DC system/triple active-bridge(TAB)converter/open-circuit fault/fault-diagnosis/fault-tolerant operation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据