中文摘要：

电网电压不平衡时,传统的整流器控制方法性能良好,但计算和控制复杂。和传统方法相比,文章采用的方法不需要对电网电压进行旋转变换和相位检测,也不必提取控制变量的正负序分量,从而有效降低了系统计算的复杂性和延迟。通过分析静止坐标系下的三电平整流器瞬时功率,在保证直流侧电压稳定及交流侧单位功率因数的条件下算得电流指令值。针对该控制方法,在Matlab/simulink数字仿真环境下对其进行了离散化仿真,实现了电网电压单相跌落或者有谐波时,直流母线电压基本稳定及交流侧电压电流同相位。

英文摘要：

Traditional rectifier controlling methods possess good performance under unbalanced network voltage, however their computation and control are complex. A control method of three-level rectifier in stationary coordinate system under unbalanced grid voltage is proposed, and comparing with traditional control methods it neither needs for the proposed method to perform rotating transformation and phase detection of grid voltage, nor to extract positive- and negative-sequence components, thus the time-delay and calculation complexity are effectively reduced. By means of analyzing instant power of three-level rectifier in stationary coordinate system, the reference current is calculated to ensure stable DC bus voltage and unit power factor at AC side. The proposed control method is simulated by Matlab/Simulink, and simulation results show that using the proposed control method the voltage of DC bus is basically stable and the current and voltage at AC side are in-phase while single-phase voltage sag occurs or harmonics exist in grid voltage.