LCC-FHMMC hybrid HVDC system can completely solve the problem of commutation failure at inverter side

and has broad application prospects in the field of power supply to passive network. The mathematical model of double ended hybrid DC transmission system is set up and

on the basis of the analysis of the fault mechanism at the sending end and the characteristics of the passive network

a kind of fault ride-through control strategy based on the bridge arm voltage control is proposed. By allowing the load to actively participate in regulating the unbalanced power of the converter station

the load switching can be avoided at the time of quickly restoring the DC power transmission. Meanwhile

the fault ride-through of the receiving converter station and the load can be achieved. The regulation range of DC voltage at the inverter side is expanded by way of relying on the characteristic that the full bridge sub-module topology can output negative level

the blocking of converter station caused by excessive discharge of sub-module capacitor is avoided

which effectively reduces the DC impulse current after fault clearance. The selection principle of relevant parameters under different severity of AC fault is designed

and then the simulation model of double ended hybrid DC transmission system is set up based on electromagnetic transient simulation software to verify the effectiveness of the proposed control strategy.