Analysis on Protection Function of VSC-HVDC Projects

In recent years, the construction of VSC-HVDC projects have been vigorously promoted in China, and its system structures and technical characteristics are quite different from LCC-HVDC projects. Therefore, this paper first describes and compares the typical system structures and technical characteristics of various projects based on the existing VSC-HVDC projects in China, and then taking actual project as an example, the protection configurations and functional principles of AC protection zone, AC connecting bus protection zone, converter protection zone and DC protection zone are analyzed. Finally, the configuration schemes of each protection function are analyzed.