中文摘要：

在孤网运行方式下，为抑制交流故障后交流系统的瞬时频率，利用换流器稳态方程导出换流母线电压与直流电流的动态关系，结合故障特点，应用HVDC的快速和高可控特性，设计了一种反映整流站换流母线电压具有惯性环节的高压直流输电（HVDC）瞬时频率附加控制器，实现对整流器给定电流的修正和直流功率调制，提高了故障后送端交流系统瞬时频率稳定性。云广±800kV特高压直流输电系统的电磁仿真结果表明，在送端交流系统故障下，该附加控制器能够有效抑制交流系统的瞬时频率。

英文摘要：

In the isolated AC system running mode, for suppressing instantaneous frequency when AC system faults, using the steady-state equations of converter, the dynamic relationship between direct current and bus- bar voltage was deduced, with application of the rapid and HVDC high controllable characteristics, a kind of reflection rectifier busbar voltage HVDC instantaneous frequency additional controller with inertial link was de- signed, which gives the current correction of rectifiers, to realize power modulation, and to keep frequency stability of sending end AC system after sending terminal AC system fault. On Yun Guang ±800 kV DC transmission system, electro-magnetic simulation results show that the additional control can suppress the AC system of sending instantaneous frequency with AC system fault occurring in sending end.