For detection and analysis of wind speed and a series of variable factors on the impact of VSC-HVDC system in wind farm, so as to improve the structure of large offshore wind farm, this paper puts forward a new type of VSC-HVDC model, named no switch VSC-HVDC phasor model, which can control system through feedback of modulation. On this basis, it combines the advantages and disadvantages of various strategies and chooses a kind of effective control strategies for the design of controller in order to realize the control of the system. AC current and DC voltage of power grid side and their control strategies are analyzed, the dq current control and PI voltage control are chosen as the optimal control strategy, through calculating and adjusting the inner and outer loop controller parameters to meet the design requirements. Matlab simulation results show that the strategies of no switch control VSC-HVDC phasor model has the applicability and rationality.