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首页 >> 新闻中心 >> 行业新闻 >> IGBT短路检测功能在模块化UPS系统中的应用

IGBT短路检测功能在模块化UPS系统中的应用

日期:2017-02-24
背景
 
模块化UPS系统中,当系统中的某一个功率模块发生故障,该功率故障模块需要及时退出系统,以减少该故障功率模块对模块化UPS系统的影响,从而保证输出电压的稳定。
 
我司在模块化UPS的研发过程中,会进行多种单一故障测试,以保障UPS功率模块在发生单一故障时,能够保证模块化UPS系统的稳定运行。其中逆变IGBT短路单一故障对模块化UPS系统的输出稳定性提出了较大的挑战。
 
只有1个功率模块的模块化UPS系统在逆变IGBT短路下的工作状态
 
当模块化UPS机柜中只插入一个功率模块,该功率模块的逆变IGBT发生短路时,输出电压及电流都下降,功率模块判断出逆变故障后,间断切换到旁路供电,输出电压恢复稳定。此过程输出间断时间小于20mS。
 
有2个功率模块的模块化UPS系统在逆变IGBT短路下的工作状态
 
当模块化UPS机柜中插入两个功率模块,其中一个功率模块的逆变IGBT发生短路时,输出电压,另一个功率模块的输出电流反灌入故?#31995;?#21151;率模块,剩余的一个功率模块输出电流能量有限,无法将故障模块的输出保险熔断。直到故障模块检测出逆变故障退出系统,系统存在一定风险间断?#20449;?#36335;供电,此过程输出间断小于20mS。
 
INVT独有的IGBT短路检测功能
 
针对上述问题,INVT 加入了独有的IGBT短路检测功能电路,结合软件算法,能够快速的检测出IGBT短路状态,主动控制功率模块退出系统,从而保证模块化UPS系统在单一功率模块逆变IGBT短路故障发生时,能够维持逆变供电,无需切换到旁路供电模式。并且间断时间小于10mS。
有2个功率模块的模块化UPS系统(具有IGBT短路检测功能)在逆变IGBT短路下的输出电压波形。
 
将具有IGBT短路检测功能的两个UPS模块插入UPS机柜,短路其中一个功率模块的逆变IGBT,利用功率模块的故障录播功能,功率模块在发生逆变IGBT短路时自动保存逆变IGBT短路时刻前后的输出电压波形。该波?#31283;?#19979;图所示:
 
根据故障录波的波形显示,输出的间断时间为8mS。大大降低了负载掉电的风险。

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