我国青海地区已建成并规划建设多个大型光伏电站，利用柔直将大规模光伏进行汇集是一种理想的方案，然而光伏逆变器和柔直整流器相互作用可能会引发振荡。为了分析光伏与柔直互联系统的稳定性，文中首先利用谐波线性化方法，在三相静止坐标系中建立了光伏与柔直互联系统的阻抗模型，然后利用理论分析与仿真相结合的方法，分析了光伏电站与柔直整流站接口处产生振荡的机理及其影响因素。理论分析和仿真结果表明，光伏逆变器和柔直整流器阻抗具有LC特性，两者会在某些频段下发生电气谐振，而使接口电压和电流产生振荡。光伏电站输出功率增加会使系统的稳定性降低，而柔直整流器电压外环控制器比例系数和锁相环比例系数增加会提高系统的稳定性。 A number of large-scale PV stations have been built and planned to be built in Qinghai Province, and it is an ideal scheme to use VSC-HVDC to gather them; however, the interaction between PV inverter and VSC-HVDC rectifier may cause oscillation. In order to analyze the stability of PV and VSC-HVDC interconnection system, the harmonic linearization method is used to establish the impedance of it in three-phase static coordinate system, and then the mechanism and influencing factors of oscillation are analyzed by combining theoretical analysis and simulation. Theoretical analysis and simulation results show that the impedance of PV inverter and VSC-HVDC rectifier has LC characteristics, and they will have electrical resonance in certain frequency bands, which will cause oscillation of interface voltage and current. The stability of the system will be reduced with the increase of the output power of the PV station, while the increase of the proportion coefficient of the voltage controller of VSC-HVDC rectifier and the phase locked loop will improve the stability.