Study on ±1100 kV HVDC project DC filter scheme

The characteristic of the DC side harmonics produced by the converter in ±1100 kV HVDC project is analyzed in this article. The DC side harmonic voltage is calculated according to the available project parameters. The calculation result and ±800 kV HVDC project are compared. The equivalent disturbing currents in DC pole lines and DC electrode lines are calculated. After many times filtering performance result for different DC filter schemes are calculated, finally one DC filter solution, which satisfies the performance limits and low-cost, is proposed. The maximum equivalent disturbing currents in DC pole lines and DC electrode lines is calculated. The maximum equivalent disturbing current: bipolar mode 2728 mA; unipolar mode 5882 mA. The result of this study is helpful in determining the final project DC filter solution.