电力系统及其自动化学报2017，Vol.29Issue(10)：18-21,29,5.DOI:10.3969/j.issn.1003-8930.2017.10.004
三电平逆变器SHEPWM技术的所有解问题
Complete Solutions for SHEPWM of Three-level Inverter
摘要
Abstract
Aiming at the problem that the selective harmonic elimination pulse-width modulation (SHEPWM) of a multi-level inverter has a high dependence on the initial values of switching angle in the solving process of nonlinear equations,double-angle trigonometric functions are used in this paper to convert the nonlinear equations of SHEPWM of three-level neutral point clamped(NPC)inverter into an algebraic polynomial mode,and all the solutions in full modulation region can be obtained by using the"Solve"function in MATLAB to process the polynomial model without the need to know the initial values of switching angle. The trajectories of switching angles and the corresponding total harmonic distortion(THD)of line voltage,which vary with the modulation ratio,are also given. Moreover,the distribu?tion characteristics of the solutions of switching angles are analyzed and compared,which provides a theoretical refer?ence for the selection of switching angles in practical engineering. Finally,the correctness and feasibility of using the"Solve"function to compute the switching angles is verified by simulations and experiments.关键词
三电平逆变器/代数多项式/消谐模型/开关角初值Key words
three-level inverter/algebraic polynomial/harmonic elimination model/initial value of switching angle分类
信息技术与安全科学引用本文复制引用
叶满园,李宋,蔡鸿..三电平逆变器SHEPWM技术的所有解问题[J].电力系统及其自动化学报,2017,29(10):18-21,29,5.基金项目
国家自然科学基金资助项目(51167006) （51167006）
江西省工业科技支撑计划资助项目(20161BBE50057) （20161BBE50057）
江西省自然科学基金资助项目(20161BAB206157) （20161BAB206157）
江西省教育厅自然科学基金资助项目(GJJ160495) （GJJ160495）
