为了满足±800 kV特高压直流输电控制保护设备测试及技术研究的需要，南瑞继保公司基于向家坝—上海 ±800 kV特高压直流输电系统电气参数搭建了特高压直流输电系统物理动态模拟仿真模型。该动态模拟系统不仅能够模拟特高压直流输电正常情况下的各种运行工况，还可以模拟换流变压器、换流阀、交直流滤波器、直流线路、交流系统等设备的故障。文中所述的闭环特高压直流输电仿真系统已成功应用于向上±800 kV特高压直流输电工程控制保护设备的出厂测试及国内特高压直流输电工程相关的多项关键科研项目，为特高压直流输电系统的建设和运行提供了有力的技术支持。

In order to test the ±800kV UHVDC control & protection system and research the UHVDC, an analog dynamic simulator for the UHVDC system has been developed by Nari-Relays Electric Co., Ltd based on the prototype of Xiangjiaba-Shanghai UHVDC transmission system to simulate such elements as main AC circuit connection, converter transformer, converter valve, DC field and AC/DC filter in detail. With the simulator, normal operation modes and all kinds of faults of the AC/DC system can be simulated. The simulator proposed by the company has been successfully used for the factory testing of the control & protection system for Xiangjiaba-Shanghai UHVDC project and some key UHVDC research projects, and contributed much in technologies to the construction and operation of UHVDC transmission systems in China.