Method for calculating voltage gradient capable of being tolerated by direct-current support capacitor

The invention discloses a method for calculating the withstand voltage gradient of a direct-current support capacitor in the technical field of capacitor withstand performance calculation. The method comprises the following steps: step 1, establishing a capacitor withstand voltage gradient calculation model; 2, according to the capacitor withstand voltage gradient calculation model in the step 1, obtaining a limit voltage gradient calculation model which can be tolerated by the lossless capacitor; 3, deducing a limit voltage gradient calculation model which can be tolerated by an actual lossy capacitor according to the limit voltage gradient calculation model which can be tolerated by the lossless capacitor in the step 2; 4, obtaining a voltage gradient calculation model which can further tolerate the direct current support capacitor through the step 2 and the step 3; by analyzing the voltage gradient of the RLC basic circuit, the voltage gradient in the capacitor test can be calculated, and the damage of the