经过多个直流输电工程的实践，我国直流输电技术国产化水平在不断提高。介绍了我国南方电网天广、贵广I 回和II回、±800 kV云广直流输电系统中交流滤波器保护采用的装置及功能。通过对比各直流输电系统中交流滤波器保护系统的优缺点，概述了我国南方电网直流输电系统交流滤波器保护系统不断完善和发展、逐渐实现国产化的历程。

After the practice of several HVDC transmission projects, the HVDC technique of China has been improved rapidly. In this paper, the protections of AC filters used in Tian-Guang、Gui-Guang I、II and ±800kV Yun-Guang HVDC transmission system are introduced. With the comparison of the protection used in each HVDC system, the course of development and the localization of the AC filters protection used in HVDC systems of CSG have been discussed.