The Simulation of Kunliulong Flexible DC Project with Single Station Operation and out of Operation

The hybrid DC transmission technology which fully combines the economic and technological advantages of LCC (Line Commutated Converter) and MMC (Modular Multilevel Converter) has developed rapidly due to its large transmission capacity and no commutation failure, etc. This paper takes Kunliulong hybrid three-terminal DC transmission project with conventional UHV converter station at the sending end and hybrid valve flexible UHV converter station at the receiving end as an example, analyzing the operation mechanism of hybrid three-terminal HVDC system. In this paper, a simulation model of hybrid three-terminal DC transmission system is established and a controller of hybrid three-terminal DC transmission system is designed by using simulation software based on line topology and parameters. The Kunliulong project is qualitatively analyzed under normal operation, single station operation and out of operation conditions, which provides reference and basis for the reconstruction and expansion of Kunliulong UHV multi-terminal Hybrid DC transmission project and other DC projects.