中文摘要：

双级矩阵变换器是一种新的矩阵变换器拓扑，存在中间直流环节，因此其整流级和逆变级可以分别采用空间矢量PWM调制策略。但是由于中间直流环节没有储能的电容或者电感，输入侧电压瞬时跌落直接影响输出电压和电流，降低双级矩阵变换器的性能。为了抑制输入电压瞬时跌落对双级矩阵变换器性能的影响，提出了一种整流级电路多种调制模式切换的控制策略，根据不同调制模式下电压利用率的不同，实现整流级电路各调制模式的平滑切换，提高整流级电路电压利用率，从而保证输出性能的稳定。该方法可以将整流级电路的电压利用率由SVM调制的0．866提高到0．955。在基于逆阻式IGBT的双级矩阵变换器样机上的实验验证了提出的方法的有效性。

英文摘要：

Two-stage matrix converter（TSMC） is a novel topology of matrix converter. It has a real DC link, and the rectifier and inverter can apply space vector PWM algorithms respectively. But no energy- stored capacitor or inductor in DC link, voltage sag in the source can immediately reflect to the output of TSMC. A control scheme of multi modulation modes smooth-switch in rectifier was proposed to restrain the influence of input voltages sag. According to the different voltage ratio of the modulation mode, when voltage sags in the source, the multi modulation mode of rectifier was smooth-switched to improve the voltage ratio to stabilize the output of TSMC. The voltage ratio of the rectifier can be improved from 0.866 of SVM to 0. 955. The experiments on a two-stage matrix converter prototype using reverse blocking IGBT validate the performance of the proposed control method.