液力变矩型同步风力发电机是一种基于液力变矩器和无刷同步发电机耦合的前端调速式风力发电机组，关键技术在于采用前端调速技术，使发电机转速恒定可以实现同步并网。风机在低速传动链上采用转速模糊闭环控制，高速传动链上采用液力变矩技术闭环控制转矩平衡，使风机在发生低电压穿越时转速与转矩控制的动态响应速度和精准度得到了较大改善。同时，同步发电机励磁系统采用强励模式，迅速提高发电机电动势及时补偿电磁功率的损失，并为电网提供无功能量支撑维持电网稳定。该机型低电压穿越性能经过现场实地认证测试，结果充分验证了其控制策略的有效性和可行性。

The synchronous wind turbine with hydraulic torque converter is a kind of frontend adjusting speed wind turbine based on the coupling of hydraulic torque converter and brushless synchronous generator. The key technology is to adopt the frontend adjusting speed technology to keep the generator speed constant and realize synchronous grid connection. The fuzzy closedloop control of speed is applied on the lowspeed drive chain of the wind turbine, and the control of torque balance is executed by the hydraulic torque converter technology on the highspeed drive chain. The dynamic response speed and accuracy of the speed and torque control is greatly improved when the wind turbine undergoes the lowvoltage ride through. Simultaneously, the forced excitation mode of excitation system introduced in synchronous generator can increase the generator EMF rapidly, compensate the loss of electromagnetic power timely, and provide reactive energy support for the power grid to maintain the stability of the power grid. The certification test of low voltage ride through performance for this wind turbine is executed on site. The result demonstrates the effectiveness and feasibility of this control strategy.