With the rapid development of China's AC/DC hybrid power grid

the characteristics of weak transmission end systems are becoming increasingly prominent. The voltage support advantages of grid forming and grid following new energy hybrid transmission modes are significant. However

the dynamic interaction process of system power during DC fault disturbance is not yet clear. Therefore

this article first analyzes the limitations of conventional grid following converters sent out through line commutated converter based high voltage direct current (LCC-HVDC). It is revealed that under weak voltage support

power oscillations are prone to occur and thus deepen the fault depth after commutation failure (CF)

leading to subsequent commutation failures. Secondly

this paper theoretically analyses the phase-volume relationship of electrical quantities corresponding to the regulation limit of the current distribution coefficient of conventional grid forming converters. It is also revealed that there is a delayed withdrawal of current limit control in the process of commutation failure in grid forming converters

which results in a poor inhibition of transient overvoltage and even leads to the occurrence of subsequent phase-change failure. Finally

the improved current limiting fault ride-through control under the time scale of commutation failure is proposed

and the correctness and effectiveness of the relevant theoretical analysis and control strategy are verified based on the PSCAD/EMTDC simulation platform.