Study on Grading Technology of DC-filter Capacitor Bank for HVDC
In this paper,the influence of bench design on DC voltage distribution is studied on the basis of bench structure of DC filter capacitor for HVDC,the relationship among the number of series segments,leakage ratio and DC voltage non-uniform coefficient of capacitor shell connection elements is studied,and the conclusion that the more the number of series segments of the elements,the more the non-uniform of the DC voltage distribution is concluded;In combination with the characteristics of the capacitor unit,it is concluded that the electric time constant of the capacitor is only a constant which is only related to ρε and,on the basis of above conclusion,the reasons for the unsatisfactory operation of the large-capacity DC capacitor bank are analyzed,and the design recommendations for DC filter capacitor banks are given.
HVDCDC-filter capacitorgrading measuresDC voltage non-uniform coefficientleakage ratioelectric time constant
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