[关键词]
[摘要]
针对三相准Z源逆变器的安全可靠运行问题,提出了一种快速、实用的准Z源逆变器IGBT开路故障诊断方法。新型IGBT开路故障诊断基于Z源逆变器自身特性实现,主要方法为在开关周期内观察故障前后直通状态的变化对系统变量的影响来辨识故障,实施时分为两个连续阶段,一是IGBT开路故障检测和定位,二是激活冗余桥臂,完成故障容错运行。利用三相准Z源逆变器低压样机开展了测试,实验结果验证了所设计IGBT开路故障诊断方案可快速检测出IGBT故障,并在0.5ms内完成系统重构,实现故障容错运行。轨道交通系统中采用所提出Z源逆变器IGBT开路故障诊断方案可以保证供电系统的可靠运行。
[Key word]
[Abstract]
Aiming at the problem of safe and reliable operation of three-phase quasi-Z-source inverters, a fast and practical IGBT open-circuit fault diagnosis method of quasi-Z-source inverters is proposed. The new IGBT open circuit fault diagnosis is realized based on the characteristics of the Z-source inverter. The main method is to observe the influence of the change of the shoot-through state before and after the fault on the system variables during the switching period to identify the fault. The implementation is divided into two consecutive stages, one is IGBT open-circuit fault detection and location, the second is to activate the redundant bridge arm to complete the fault-tolerant operation. The tests were carried out with a low-voltage prototype of a three-phase quasi-Z-source inverter. The experimental results verified that the designed IGBT open-circuit fault diagnosis scheme can quickly detect IGBT faults, and complete the system reconstruction within 0.5ms to achieve fault-tolerant operation. The use of the proposed Z-source inverter IGBT open-circuit fault diagnosis scheme in the rail transit system can ensure the reliable operation of the power supply system.
[中图分类号]
TM461
[基金项目]
浙江省科技计划项目(2019C01144)