基于三电平的优化SVPWM算法研究

摘要

For the basic relationship between SVPWM and SPWM modulation strategy theory, the three-level fast equivalent SVPWM algorithm based on the increase of zero voltage vector is put forward.The algorithm is based on the increase of the time to zero voltage vector function, and directly uses the reference voltage instantaneous value to calculate each phase bridge arm switch tube conduction time, thus not only removing the traditional calculation of trigonometric functions of SVPWM algorithm, but also reducing the THD.Finally, in the environment of MATLAB/Simulink simulation experiment, simulation results show that compared with traditional SVPWM algorithm, the three-level fast equivalent SVPWM algorithm has the advantages of simple implementation, short computing time, and small THD.%基于SVPWM与SPWM调制策略之间的基本关系原理,提出一种依据增加零电压矢量作用的三电平逆变器的快速等效SVPWM算法.此算法根据增加的零电压矢量作用时间的长短,并且直接利用参考电压的瞬时值来计算每相桥臂开关管的导通时间,不仅免去了传统SVPWM算法中的复杂三角函数计算,也减少了THD.最后,在MATLAB/Simulink环境下进行系统的仿真实验.实验结果清楚地表明,所提的三电平逆变器的快速等效SVPWM算法相对于传统SVPWM算法具有实现简单、计算量少、THD小的优点.