Study on the DC filter design for ±800 kV UHVDC transmission projects

DC filter is one of most important equipment installed in HVDC transmission project DC filed. Based on the study result attained, this paper analyzes the key issues of DC filter design for ±800 kV UHVDC transmission project, including the type of DC filter, resonance of DC side and typical faults of DC filter, and introduces the models and methods for the typical faults calculation of DC filter. Yunnan-Guangdong ±800 kV UHVDC transmission project being taken as an example, the resonance of DC side is verified and the transient ratings of DC filter components are calculated, showing that the design of DC filter of the project is reasonable, and it can meet the requirement of the project operating safely.