The damping capacitor

as an important component of thyristor converter valve

is in series with damping resistor to form damping circuit

which is placed on both ends of thyristor in parallel connection so to achieve dynamic grading of series thyristor

suppress commutation overshoot.Its parameter and structure design are the important links in the design of converter valve.In view of the smart design requirement of thyristor valve

a kind of integrated damping capacitor design method is proposed.Firstly

a simplified model for switching off the converter valve is established

the optimal resistance-capacitance parameter of thyristor is solved by an analytical method and is substituted the real electric circuit to analyze electrical stress at capacitor operation.Then

the flat integrated damping capacitor structure is proposedbased on the characteristics of the damping circuitand its structural parameter of case is determined through simulation of electrostatic field.Finally

the flat and integrated square damping capacitor design method is described from such two aspects as electric al and structure with combination of actual engineering parameter.The feasibility of the proposed method is verified by the capacitor proper test and the application test in the converter valve prototype.