A novel coordinated control strategy for wind farms based on offshore doubly-fed induction generator(DFIG)type integrated into voltage source converter based(VSC-based)high voltage direct current(HVDC)transmission system is proposed. The constant power control strategy based on phase locking loop(PLL)is applied to the sending converter station

which regulates the active power according to the reference from the wind farm. Meanwhile

the droop of the active power and the squared DC voltage is added to active power control loop of the sending converter station to enhance the transient stability of the DC voltage. The synchronized control is applied to the offshore DFIG wind turbines

which can control the amplitude and angle for the offshore AC grid voltage. Compared with the classical fault ride-through(FRT)coordinated control strategy

this novel control strategy can enhance the DC voltage transient stability and is insensitive to communication delay. Meanwhile

the novel control strategy can also achieve low-voltage ride-through in the case of a 3-phase short-circuit at the sending converter station. This paper uses the example of an offshore wind farm integrated into a two-terminal multilevel modular converter(MMC)VSC-based HVDC transmission system as simulation cases to validate the effectiveness and advantages of the novel FRT coordinated control strategy. This work is supported by National Key Research and Development Program of China(No. 2016YFB0900100).