一种简化的三电平逆变器空间矢量脉宽调制算法  

A Simplified Space Vector PWM Algorithm for Three-Level NPC VSI

作　　者：丁娅[1] 李山[1] 叶阳建 王程[1] 

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2016年第8期122-128,142,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆理工大学基金资助项目

摘　　要：提出了一种简化的三电平中点钳位(NPC)电压型逆变器的空间矢量脉宽调制(SVPWM)算法。正弦脉宽调制(SPWM)波形对称规则采样波形类似于七段式SVPWM对称规则采样波形,唯一不同的是,这2种算法具有不同的零电压矢量运算时间。基于两电平逆变器SVPWM和SPWM的关系,提出了一种NPC型三电平逆变器SVPWM的简化算法,并引入一个从0变化到1的零矢量分布变量k。在该算法的基础上,提出了一种简单的中点电压平衡方法。与传统的SVPWM算法相比,由于新算法直接采用每个逆变桥臂的三相参考电压瞬时值计算实际的导通时间,使得简化的SVPWM算法更容易在数字器件中实现。通过Matlab SIMULINK仿真结果验证了此算法的有效性和可行性。This paper proposed a simplified space vector pulse width modulation （SVPWM） algorithm for three-level neutral point clamped （NPC） voltage source inverter. The waveform of sinusoidal pulse width modulation （SPWM） symmetric regular sampling is similar to the waveform of seven-segment SVPWM symmetric regular sampling. The only difference is that the two algorithms have different operation time of zero voltage vectors. Based on two-level inverter and the relationship between SVPWM and SPWM, a simplified SVPWM algorithm for threelevel NPC VSI was developed. A zero-vector distributi-on variable k, which changes from zero to one, was introduced. On the basis of proposed algorithm, a simple neutral-point voltage balancing method was proposed. Compared with the conventional SVPWM algorithm, the simplified SVPWM algorithm can be more easily imple- mented in a digital device because the algorithm directly uses the instantaneous value of three phase refere-nce voltages to calculate actual gating time for each inverter leg. The simulation results show that proposed method is valid and feasible.

关 键 词：简化SVPWM算法 三电平逆变器 中点电压平衡 零电压矢量 

分 类 号：TM624[电气工程—电力系统及自动化]