Direct current support capacitor

The invention relates to the technical field of flexible direct-current power transmission, and discloses a direct-current support capacitor, which comprises a capacitor core body, a bus copper bar, a sleeve assembly, a potting material and a capacitor shell, and is characterized in that the capacitor core body is accommodated in the capacitor shell, the bus copper bar is arranged at the upper end of the capacitor core body, and the sleeve assembly is arranged on the bus copper bar; and a potting material is filled between the capacitor core body and the inner wall of the capacitor shell. According to the capacitor elements, the grid-shaped bus copper bars are connected in parallel, and the cross sectional area of the bus copper bars is equivalently increased by removing the tinned braided copper strips and forming the square holes in the copper bars, so that the copper bar resistance when harmonic current flows through is reduced, the heating loss of the direct-current support capacitor is reduced, and the s