中文摘要：

将滤波换相换流器（FCC）引入到多馈入直流输电（MIDC）系统,以CIGRE直流输电标准模型为基础,推导求得含FCC的混合MIDC系统（由FCC和电网换相换流器（LCC）构成）的熄弧角计算模型。通过算例对比分析了传统MIDC系统和混合MIDC系统在不同电气距离和交流强度下逆变站发生换相失败时的相互影响。在PSCAD/EMTDC中建立了传统MIDC系统和混合MIDC系统模型,并进行仿真对比研究,结果表明：与传统MIDC系统相比,FCC提高了熄弧角裕度,有效提升了换相过程中的抗扰动能力,也削弱了子系统间换相失败的影响强度,降低了发生连续换相失败的几率。

英文摘要：

By integrating FCC（Filter Commutated Converter） into MIDC（Multi-Infeed HVDC） transmission system and based on CIGRE benchmark HVDC model,the extinction angle calculation model is deduced for the hybrid MIDC transmission system composed of FCC and LCC（Line Commutated Converter）.By case study,the interaction among inverters during commutation failure is analyzed for different electrical distances and strengths of AC power system and compared between traditional and hybrid MIDC transmission systems.Based on PSCAD / EMTDC,the models of traditional and hybrid MIDC transmission systems are built and the simulative study indicates that,compared with traditional MIDC transmission system,FCC broadens the extinction angle margin,enhances effectively the anti-disturbance capability of commutation process,weakens the interaction among inverters and decreases the possibility of continuous commutation failure.