单相Z源三电平中点钳位逆变器空间矢量调制方法

Space Vector PWM Algorithm for Z-Source Single-Phase Three-Level Neutral Point Clamped Inverter

研究了一种单相Z源三电平中点钳位(NPC)逆变器。提出了一种适用于该单相Z源三电平NPC逆变器的空间矢量脉宽调制(SVPWM)方法,实现了逆变器的升压输出。根据负载电流方向和直流侧分压电容电压偏差的大小,通过调整正负小矢量的作用时间,实现了直流侧分压电容中点电位的平衡控制。仿真结果验证了该单相Z源三电平逆变器及其空间矢量调制方法的有效性。

A topology of single-phase Z-source three-level neutral point clamped （NPC） inverter was proposed. A suitable space vector PWM scheme was also introduced, thus the output voltage gets boosted. According to the load current direction and the difference of the DC side capacitor voltages and by adjusting the effective time of the positive and negative small vectors, the neutral potential of the DC side capacitors gets controlled. The simulation results verify the validity of the single-phase Z-source NPC inverter and SVPWM algorithm.