Research on the rationalization of field commissioning for multi-terminal HVDC projects-taking lugaozhao HVDC project for example

High Voltage Direct Current(HVDC) transmission projects has been playing crucial role in China Southern Power Grid(CSG). These projects transmit the numerous hydro electricity from Yunnan to Guangdong and Guangxi. Keeping these HVDC projects stabilized operating is important to the whole power grid. Different from Alternate Current(AC) transmission projects, 78% of debugging and checking work for HVDC devices is proceeding before being service as estimated, the commission work actually. The Lugaozhao HVDC project is ±500kV three-terminal HVDC project, which is updated from Gaozhao HVDC project. The multi-terminal project keeps operating normally in the following year after well designed field commission. The paper analyzed the rationality of field commission for multi-terminal HVDC project through the principles, contents and unexpected action in commission.