晶闸管旁路开关在UPFC中的应用

在统一潮流控制器(UPFC)系统中为了防止串联变压器以及换流器在系统发生故障时因过电压损坏,要在串联变压器的一次侧或二次侧并联快速旁路设备,文中研究的晶闸管旁路开关是一种利用晶闸管快速导通性能的旁路开关设备。首先介绍了UPFC的过电压保护原理,快速旁路设备的组成及技术性能要求,然后以南京UPFC工程为例设计了快速旁路设备中晶闸管旁路开关(TBS)的结构、参数并进行器件的选型,校核晶闸管旁路开关的BOD保护和MOV之间的过电压配合,通过温升试验以及在合成回路中进行的最大短时电流耐受试验验证了晶闸管旁路开关的性能,最后介绍了TBS的状态检测系统构成及其检测流程。

The application of thyristor bypass witch in UPFC

To prevent the series transformer and inverter valve from over-voltage in the Unified Power Flow Controller (UPFC) during system fault, the two wingdings of series transformer should be paralleled with fast bypass devices such as mechanical bypass switch, thyristor bypass switch (TBS), MOV and etc. TBS that utilizes the fast conduction of thyristor is studied. The overvoltage protection principle of UPFC is introduced first, then taking the Nanjing UPFC project as an example, the structure and parameters of TBS are designed, the components selection of TBS is introduced and the overvoltage matching between the BOD protection of TBS and MOV is checked. The performance of TBS is verified by maximum short-time current withstand test in the synthetic test circuit and temperature rise test. In the end, the structure and detection process of the state detection system of the TBS are introduced.