针对计及电流限制的水光互补发电经柔性直流送出系统暂态同步稳定性问题开展了研究。首先，考虑故障期间光伏逆变器与柔直整流器的限电流控制策略，基于戴维南定理推导得出故障切除前水电机组送出有功功率的数学表达式。其次，依托等面积定则推导出送出系统临界切除角的解析公式，并将该临界切除角作为衡量送出系统暂态同步稳定极限的核心指标，系统评估了光伏与柔直换流器饱和电流角参数取值、水光发电比例对送出系统暂态稳定性的影响规律，进而提出了一种能够提升系统暂态同步稳定性的最优控制参数整定方案。最后，通过时域仿真验证了送出系统暂态同步稳定性影响因素分析的准确性，以及所提最优控制参数整定方法的有效性。

A study is conducted on the transient synchronization stability of a hydropower and photovoltaic power generation system transmitted via voltage source converter high voltage direct current (VSC-HVDC) considering current limitations. Firstly, accounting for the current-limiting control strategies of photovoltaic inverters and flexible rectifiers during faults, a mathematical expression for the active power output of hydro-generating units before fault clearance is derived based on Thévenin′s theorem. Secondly, leveraging the equal area criterion, an analytical formula for the critical clearing angle of the transmission system is deduced. This critical clearing angle served as a key indicator for evaluating the transient synchronization stability limit of the system. The influence of parameters such as the saturation current angle of photovoltaic and flexible converter stations, as well as the hydro-photovoltaic power ratio, on the transient stability of the transmission system is systematically assessed. Subsequently, an optimal control parameter tuning scheme is proposed to enhance the system′s transient synchronization stability. Finally, time-domain simulations verify the accuracy of the analysis on factors affecting transient synchronization stability and the effectiveness of the proposed optimal control parameter tuning method.