Commutation failure (CF) is an inherent problem faced by line commuted converter high voltage direct current (LCC-HVDC) technology. To completely solve the problem of commutation failure

Tsinghua University has proposed a novel hybrid commutated converter (HCC) technology based on reverse blocking integrated gate commutated thyristor (RB-IGCT)

which can utilize two methods for commutation: grid voltage commutation and active turn-off forced commutation. This paper first explores the changes that HCC topology needs to make compared to LCC

and then presents different operating modes and control strategies based on different operating conditions. By building a simulation model of the ultra-HVDC system

this paper analyzes the transient

steady-state

and typical fault operation characteristics of HCC. The experimental platform for IGCT-HCC is established

and corresponding tests are conducted on the components and system characteristics of HCC

verifying the correctness and effectiveness of the HCC scheme. This article provides support for the application of HCC in the field of HVDC

which is of great significance for solving the problem of commutation failure in HVDC.