Key technology on AC filter capacitor bank in HVDC converter station is mainly described inthis paper and the parameters of filter capacitor bank is obtained by calculation in accordance with the needof filtering and reactive power capacity. The parameters and layout scheme of the capacitor bank areobtained as per the calculation result of insulation coordination

electric field distribution and structureseismic. The unbalance protection scheme is proposed according to the structure of the capacitor bank.TheAC filter capacitor at Funing converter station is taken as an example to verify the design reasonability.Atpresent

the AC filter capacitor bank of Funing converter station has been put into operation with goodfiltering and compensation result.