一种新型级联多电平单相空间矢量调制研究

Study of a Novel Single-phase SVPWM Based on Multilevel Topology

采用空间矢量脉宽调制(SVPWM)的级联H桥多电平逆变器,由于电压矢量数目过多,导致PWM发波时间计算困难及电压矢量选择复杂。对此研究了一种优化单相空间矢量级联多电平控制算法,将二维坐标空间矢量映射到一维坐标轴上,并根据对称原则选择扇区矢量,减少级联单元输出功率不平衡率,计算结果表明采用新的SVPWM算法可实现功率单元均衡输出。实验结果表明,所研究的算法实现了单相级联多电平SVPWM的简化,输出电压波形畸变率较小。

Cascade H-bridge multilevel inverter using space vector pulse width modulation（SVPWM）, producing ex- cessive number of voltage vector, which adds difficulties to calculate the PWM wave time and selects voltage vec- tor.This paper proposes an optimized single-phase space vector control algorithms based on cascade multilevel.The two-dimensional coordinate space vector axis is mapped to one-dimensional,and selecting sectors vector according to the principle of symmetry to reduce the cascade unit output power imbalances rate.The calculation shows that the new SVPWM algorithm can achieve balancing output of the power unit.The experimental results show that the study of algorithms can simplify the single-phase cascade multilevel SVPWM, the output voltage waveform distortion becomes smaller.