基于SA-PSO算法的多电平逆变器半周期对称SHEPWM技术

Half-cycle Symmetric SHEPWM Technology of Multilevel Inverter Based on SA-PSO Algorithm

针对逆变器输出波形半周期对称需求,分别建立逆变波形半周期奇对称和半周期镜对称两种情况下的SHEPWM技术数学模型,并通过MATLAB/Sirnulink仿真平台搭建级联H桥型7电平逆变电路,控制方法采用SHEPWM技术,寻优算法采用SA-PSO算法,通过仿真分析,可知逆变波形半周期镜对称条件下,逆变器输出线电压THD值更低,且不含偶次谐波,因此成为半周期对称SHEPWM技术更为理想的波形设定。

According to the requirement of half-cycle symmetry of inverter output waveform,the mathematical models of SHEPWM technology are established under the conditions of half-cycle odd symmetry and half-cycle mirror symmetry.The cascaded H-bridge 7-level inverter circuit is built in MATLAB/Simulink,SHEPWM technology is adopted as the control method,and SA-PSO algorithm is adopted as optimization algorithm.Through simulation analyse,it can be known that the output line voltage THD of inverter under the condition of half-cycle mirror symmetry of inverter waveform is lower and contains no even harmonics.Therefore,it becomes a more ideal waveform setting for the half-cycle symmetric SHEPWM tech no logy.