Pulse width modulation current source converter (PWM-CSC) composed of reverse-blocking integrated gate-commutated thyristor (IGCT) can completely solve the problem of commutation failure when LCC is applied to the receiving end

but PWM-CSC has the disadvantage of high operating loss and driver power. In response to this issue

this article proposes a capacitor commutated current source converter composed of reverse blocking IGCT. Firstly

a mathematical model of capacitor-commutated current source converter (C-CSC) is established

and based on the switching characteristics of IGCT

a valve turning off strategy is proposed and the ability of C-CSC to resist commutation failure is analyzed. Secondly

based on the operating principle of C-CSC

the design principles of C-CSC forward trigger angle and main circuit parameters are provided. Subsequently

a simulation model of C-CSC is built using the cigre benchmark. The comparisons of resist commutation failure ability between C-CSC and line commutated converter (LCC)

and the fault ride through characteristics under constant voltage and constant extinction angle control strategies is compared. The active and reactive operating characteristics of C-CSC during deep fault conditions are analyzed. Finally

a comparative analysis is conducted on the loss and junction temperature characteristics of C-CSC

PWM-CSC

and Hybrid-line commutated converter (H-LCC) under steady-state and transient operating conditions.