Abstract: The risk of sub-/super-synchronous oscillation of renewable energy base connected into line commutated converter-based high voltage direct current (LCC-HVDC) seriously restrict the safe operation of the system. Impedance model has gradually become an effective method to analyze and solve the oscillation issues of large-scale renewable energy grid connection. In the current LCC-HVDC impedance modeling, the receiving-end converter station is equivalent to an ideal voltage source, so the influence of receiving-end converter station and the power grid strength are not considered yet. Firstly, an analytical LCC-HVDC impedance model is established, which taken the receiving-end converter station and power grid strength into account. The impedance coupling relationships between AC side and DC side of converter station, and between the sending-end station and receiving-end station are analyzed. And then, based on the coupled small-signal model between the sending-end and receiving-end stations, the influence mechanism of the receiving-end power grid strength, phase lock loop and DC voltage loop control at the receiving-end station, and DC current loop control at the sending-end station on the LCC-HVDC AC port impedance characteristics is revealed. Finally, based on the renewable energy and LCC-HVDC control and protection devices, an electromagnetic transient real-time simulation platform of the renewable energy base connected into LCC-HVDC is constructed. The impedance analysis and time-domain simulation of the system oscillation are carried out to verify the influence of the receiving end on the LCC-HVDC sending-end oscillation characteristics.