中文摘要：

三相/电平/开关中点嵌位VIENNA整流拓扑因为良好的谐波性能和较低的管子电压应力而在AC-DC单向整流器中得到广泛的应用。以抑制直流电压纹波和单位功率因素校正为控制目标,该文给出一种新型的abc自然坐标系下电网三相不平衡时VIENNA整流器的控制方法。首先通过已经提出的直接解耦同步法（direct decoupled synchronization method,DDSM）,得到三相不平衡电网电压的正负序分量和参数,然后结合对电网三相不平衡时VIENNA整流器的数学建模和分析,得到了abc坐标系下电流环三相参考电流的给定方案。这些给定参考电流仍然是基波频率的正弦信号并可以很方便地进行跟踪。与传统的双坐标变换法相比,该方法通过有效结合直接解耦同步法并直接在abc自然坐标系下给定三相参考电流,大大简化了控制方法的复杂程度。通过DSPACE半实物仿真实验,验证了该方法的工作性能。

英文摘要：

Three-phase/level/switch neutral-point clamped VIENNA topology is very suitable for AC-DC unidirectional power rectifier application for its low current harmonics and low blocking voltage stress on the power semiconductors. A novel natural frame control scheme for a VIENNA rectifier under three unbalanced operation conditions was proposed, in order to eliminate the dc-link voltage ripple and the dc component of the reactive power. Firstly, by applying an early developed direct decoupled synchronization method （DDSM）, fundamental positive-/negative-sequence voltages were derived. Then, natural frame current control loop was designed based on mathematical modeling of VIENNA rectifier under three-unbalanced conditions, in which the three-phase current reference generated were still sinusoidal waveforms with fundamental frequency. Realized in the natural abc frame, the proposed control scheme considerably reduces total algorithm complexity in comparison to traditional dual current control schemes. Experimental results are given to demonstrate the effectiveness of the proposed control scheme.