The fault characteristics of large-scale photovoltaic （PV） sending-end grid under VSC-HVDC are significantly affected by the control strategy and system topology form of double-end power electronic equipment, and the adaptability of traditional relay protection is challenged. Considering the fault control strategy of the converter, the topology of the sending-end grid, the transformer wiring mode and the fault location, a fault-equivalent model of the AC transmission line of the PV sending-end grid in terms of both equipment modeling and system modeling is established. By analyzing the composite sequential network of the system, the differential current characteristics of asymmetrical faults and fault distance impedance characteristics are extracted. Based on the fault characteristics of the VSC-HVDC side, asymmetric fault distance protection schemes for PV sending-end grid are proposed. For the distance protection scheme of grounded short-circuit fault, the fault distance impedance is calculated by using the sequential component characteristics, which is not affected by the transition resistance in principle. For the distance protection scheme of the ungrounded short-circuit fault, the fault distance is calculated based on the impedance complex-plane method by utilizing the fault-phase differential-current characteristics. Based on the simulation results of PSCAD/EMTDC, the proposed schemes can accurately calculate the fault distance impedance by utilizing only the single-ended quantity information of the VSC-HVDC side, reliably distinguish between internal and external faults, and improve the ability of the distance protection to tolerate the transition resistance in the double-ended weak-feeding scenario.