一种三相四桥臂拓扑结构的新型矩阵变换器

A three-phase four-leg topology of the new matrix converter

提出了一种三相四桥臂矩阵变换器的电路拓扑结构,可作为三相四线制交流电压源对三相不平衡负载供电.针对该矩阵变换器的拓扑结构,提出了一种新颖的间接空间矢量调制策略,并推导了开关矢量合成公式,给出了区间选择、占空比计算和输出参考电压设定的方法,最后对该新型电路拓扑进行了仿真研究.结果表明,该拓扑结构能在三相负载不平衡情况下,保证输出电压波形的正弦性和稳定性.

We present a three-phase four-leg matrix converter circuit topology, which can be used as three-phase four-wire AC voltage source to power the load imbalance. For the matrix converter topology, a novel indirect space vector modulation strategy is proposed, and the switch vector synthetic formula are deduced, giving a range of options, duty-cycle calculation and output reference voltage settings. Finally the new circuit topology for the simulation is studied. The results show that the circuit topology under three-phase unbalanced load can ensure sinusoidal output voltage waveform and stability.