针对三相Vienna整流器采用传统控制在系统负荷变化、网侧电压波动时响应速度慢、抗干扰性差的问题，以及常用滑模控制存在的抖振、稳态误差等问题，提出了基于二阶非奇异终端滑模和模型预测的控制策略。在电压外环引入二阶非奇异终端滑模控制，以实现在负载扰动和电网电压波动时直流侧电压的快速恢复和稳定输出。在内环采用模型预测电流控制，使输入电流具有快速跟踪速度的同时保持低谐波畸变率。仿真和实验结果验证了所提控制策略的可行性和有效性。

In response to the issues of slow response speed and poor anti-disturbance performance of traditional control methods for three-phase Vienna rectifiers under system load variations and grid-side voltage fluctuations, as well as the problems of chattering and steady-state errors associated with commonly used sliding mode control, a control strategy based on second-order nonsingular terminal sliding mode and model predictive control is proposed. The second-order nonsingular terminal sliding mode control is introduced into the voltage outer loop to achieve rapid recovery and stable output of the DC-side voltage under load disturbances and grid voltage fluctuations. The model predictive current control is adopted in the inner loop to enable the input current to have fast tracking speed while maintaining low harmonic distortion. Simulation and experimental results verify the feasibility and effectiveness of the proposed control strategy.