Fundamental frequency modulation based current source converter (FFM-CSC) adopts advanced reverse impedance integrated gate commutated thyristor (IGCT) and greatly reduces switching losses by imitating the control method of line commutated converter (LCC)

while also having the ability to resist commutation failure. To solve the nonlinear and uncertain initial value differentiation problem in the steady-state stress analysis process of FFM-CSC

this paper proposes a modeling method named cyclic segmented analysis. The main electrical stress analysis

such as amplitude and harmonics

is carried out using the calculated time-domain expression. Finally

the accuracy of the modeling method and the convenience of FFM-CSC characteristic analysis are verified through simulation.