【目的】 对于高渗透新能源的送端电网，目前常采用快速切机或紧急降低新能源场站功率的措施来应对直流闭锁故障，但切机会削弱系统强度，进而恶化暂态过电压，容易引发连锁脱网事故。为此，提出一种直流闭锁故障下考虑暂态过电压约束的送端风电调切策略，在保障系统稳定的同时防止电压越限。 【方法】 在分析了直流闭锁后切机操作对换流母线暂态过电压影响的基础上，明确了考虑暂态过电压约束的风电机组调切原则，根据直流闭锁稳控指令值与场站总减载上限的大小来执行“以调代切”模式或“调切并举”模式，并在调切并举模式下进一步分析了暂态过电压约束对风电场站最大可切除量的影响，并据此制定了切机量计算原则和切机场站选择策略。 【结果】 基于DIgSILENT/PowerFactory平台搭建仿真模型进行验证，结果表明所提策略能够有效应对高渗透率新能源送端电网的直流闭锁故障，有效规避了暂态过电压引发的连锁脱网风险。 【结论】 所提策略为解决高比例新能源送端电网在直流闭锁过程中的暂态过电压与稳定控制矛盾提供了具体可行的方案，有助于提升电网安全稳定运行能力。

[Objective] For the power grid with high penetration of new energy，measures such as rapid shut-off or emergency reduction of the power of new energy stations are often used to deal with DC lockout faults，but the cutting will weaken the strength of the system，which will worsen the transient overvoltage，which can easily cause chain off-grid accidents. Therefore，a wind power switching strategy at the sending end considering transient overvoltage constraints under DC lockout fault is proposed to ensure the stability of the system and prevent the voltage from exceeding the limit. [Methods] On the basis of analyzing the transient overvoltage of the converter bus after DC lockout，the principle of wind turbine switching considering the transient overvoltage constraint is clarified，and the "switching instead of cutting" mode or "switching and cutting simultaneously" mode is implemented according to the DC locking stability control instruction value and the upper limit of the total load reduction of the station. [Results] Finally，a simulation model is built on the DIgSILENT/PowerFactory platform for validation. The results demonstrate that the proposed strategy effectively mitigates DC block faults in high-penetration renewable energy sending-end grids while avoiding cascading disconnection risks caused by transient overvoltage. [Conclusions] The proposed strategy provides a specific and feasible solution to solve the contradiction between transient overvoltage and stable control in the process of DC lockout of a high proportion of new energy transmission power grid，which is helpful to improve the safe and stable operation of the power grid.