直驱式永磁同步风力发电机组(permanent magnet synchronous wind turbine generator，PMSG)全功率变流器是具有非线性、强耦合的复杂系统，易受到电网电压波动及非线性负载影响。为提高变流器直流母线电压的稳定性，提出一种基于改进线性自抗扰控制(linear active disturbance rejection control，LADRC)技术的PMSG高电压穿越控制策略。在传统LADRC基础上，将总扰动的微分扩张为一个新的状态变量，对总扰动的变化趋势进行提前观测，提高线性扩张状态观测器(linear extended state observer，LESO)的动态扰动观测能力。直流侧采用卸荷电阻优化方案，网侧变流器运行于无功补偿模式，为电网电压恢复稳定提供动态无功支撑。多种工况下的仿真结果表明，该控制策略缩小直流母线电压波动范围的同时减少了调节时间，能有效提升直流母线电压抗干扰能力，确保PMSG在高电压故障期间不脱网连续运行，同时提供一定的感性无功帮助电网电压恢复稳定。

The full power converter of direct-driven permanent magnet synchronous wind turbine generator (PMSG) is a complex system with nonlinear and strong coupling, which is easily affected by voltage fluctuation of power grid and nonlinear load. In order to improve the converter DC bus voltage, a high voltage ride through control strategy of PMSG based on improved linear active disturbance rejection control (LADRC) technology is proposed in this paper. Based on the traditional LADRC, the differential of the total disturbance is expanded into a new state variable, and the change trend of the total disturbance is observed in advance to improve the dynamic disturbance observation capability of the linear extended state observer (LESO). The unloading resistance optimization scheme is adopted on the DC side, and the converter on the grid side runs in reactive power compensation mode to provide dynamic reactive power support for voltage stabilization. The simulation results under various operating conditions indicate that this control strategy reduces the fluctuation range of DC bus voltage while reducing the adjustment time, effectively improving the anti-interference capability of DC bus voltage, ensuring that the PMSG does not disconnect from the grid for continuous operation during high voltage faults, and providing a certain amount of inductive reactive power to help restore stability to the grid voltage.