中文摘要：

根据三相电压型脉宽调制（pulse width modulation，PWM）整流器的瞬时功率数学模型，在矢量空间中分别研究每个开关矢量对瞬时功率的不同影响，给出相应的作用图，并由此将整个空间重新划分为18个非固定扇区，提出一种新的具有通用性的开关矢量表，在此过程中探究直接功率（direct power control，DPC）控制的调制机制。这种新的开关矢量表不仅可以克服传统开关表对无功功率控制上的缺陷，获得更好的稳态和动态控制效果，而且可以对其他开关表的不足进行一定的解释。文中通过不同开关表的控制系统对比仿真与实验，验证了各项结论的正确性和实用性。

英文摘要：

The instantaneous power mathematical model of three-phase voltage-source pulse-width-modulation （PWM） rectifiers was introduced in this paper. In the vector-space, the influence on instantaneous power exercised by all the six power switches were studied and illustrated separately. The entire vector-space has been divided into 18 non-fixed sectors, by which a novel and generic switching-vector-table was proposed to research the modulation mechanism of direct-power-control （DPC）. This method can not only tackle the defects of the traditional method for reactive power control then make a better steady-state and dynamic performance, but also give an explanation of the shortcomings of the other switching tables. Simulations and experiments with different switching tables were carried out. The correctness and feasibility of the proposed control scheme was verified by the simulating and experimental tests.