为降低 Vienna 整流器的生产成本，提高控制算法的工作效率，设计了基于无电流传感器的单闭环控制策略． 针对 Vienna 整流器的中点电位波动和传统三电平空间矢量调制(SVPWM)计算繁琐的问题，引入一种基于载波调制的简化等效 SVPWM 技术，主要是通过在零序分量中加入平衡因子来控制中点电位平衡． 单闭环控制算法和等效 SVP-WM 相结合大大简化了控制系统的设计过程，提高了整个控制系统的工作效率． 最后通过实验验证了该控制算法的正确性和高效性．

In order to reduce the cost of three-phase Vienna-type rectifiers and improve the efficiency of corresponding control algorithms，a single closed-loop strategy without current sensor is designed． Aiming at the problems of the neutral point voltage unbalance and the complex calculation of the space vector pulse width modulation(SVPWM) topology of Vienna-type rectifiers，a simplified equivalent SVPWM technology is proposed based on carrier modulation，which controls the neutral-point potential balance mainly by adding the balance factor into the zero-sequence component． The combination of the single closed-loop control algorithm with the equivalent SVPWM simplifies the design process of the control system，and improves the efficiency of the whole control system． Finally，the correctness and effectiveness of the proposed algorithm are verified by an experiment．