为避免柔性直流分区对频率稳定性造成的负面影响，提出了一种柔性直流系统送受端频率耦合控制方法，并分析采用该方法后系统的稳定性。首先，针对柔直逆变站提出直流电压与交流频率的耦合附加控制，将受端交流频率变化映射至直流电压信号；其次，针对柔直整流站提出有功功率附加控制，以送端频率和直流电压变化为输入调整有功功率指令值；然后，在采用上述控制方法的情况下建立交直流系统状态空间模型，分析送受端频率耦合控制对系统稳定性的影响；最后，在一个修改的IEEE 11节点系统中进行测试，验证了所提出送受端频率耦合控制方法的有效性与稳定性分析结果的正确性。

To mitigate the negative impact of modular multilevel converter （MMC） based high voltage direct current （HVDC） systems partitioning on frequency stability, a method for frequency coupling control of the sending and receiving ends is proposed, and the system stability after adopting this method is analyzed. Firstly, for the receiving-end MMC station, a coupling additional control of DC voltage and AC frequency is proposed, mapping changes in AC frequency to the DC voltage signal. Secondly, for the sending-end MMC station, active power additional control is proposed, adjusting the reference value based on changes in sending-end frequency and DC voltage. Then, under the application of the aforementioned control method, a state-space model of the AC/DC system is established to analyze the impact of frequency coupling control on system stability. Finally, tests are conducted in a modified IEEE 11-bus system to validate the effectiveness of the proposed frequency coupling control method and the correctness of stability analysis results.