中海油文昌柔性直流输电系统暂态故障仿真分析

柔性直流输电是基于电压源换流器的新一代高压直流输电技术。针对中海油文昌±10 kV/4 MW柔性直流输电项目,在PSCAD/EMTDC仿真环境下分别对直流侧系统、逆变侧系统故障进行仿真分析。结果显示,换流器直流侧电容器组和电缆之间加入串联电抗器能够有效抑制短路电流。逆变器交流400 V发生短路时,故障电流越限快速闭锁逆变侧换流器,能够阻止故障的扩大、保障设备安全。

Simulation Analysis on the Transient Fault of CNOOC Wenchang VSC-HVDC Transmission System

Flexible DC transmission is a novel generation of HVDC power trasmission technology with voltage source converters. For the CNOOC Wenchang ±10 kV / 4 MW project, the fault conditions of DC side and inverter AC side are analyzed with PSCAD / EMTDC simulation software. The results show that the short-circuit current can effectively be inhibited with a reactor in series installed between the DC capacitor and the DC cable, and the fault of AC 400 V shorting at inverter, which leads fault current out of limitation, can be prevented to be worse with quick block of the inverter side so to ensure the device seculity.