头脑风暴优化算法的SHEPWM逆变器剩余谐波分析

Analysis of residual harmonics of SHEPWM inverter based on brainstorming optimization algorithm

传统数值算法在求解NPC逆变器SHEPWM消谐模型时,存在初值依赖性高且不易收敛的问题。采用头脑风暴算法求解三电平NPC逆变器消谐模型的开关角度,通过分组、替换、创造操作更新个体,增加种群的多样性,提升逆变器SHEPWM消谐模型的计算精度,分析单极性调制方式下的剩余谐波分布规律,利用Matlab/Simulink仿真验证该算法的准确性。结果表明,输出的相、线电压中5、7、11、13次及3的倍数次谐波含量为0,剩余的最低3~4次谐波成为主导谐波,而剩余高次谐波含量较低,可以忽略不计。在谐波要求较高的场合,为降低谐波能量可以有选择地消除该类谐波。

This paper is focused on the efforts to address the traditional numerical algorithm plagued by higher initial value dependence and more difficulties in convergence as occurs in solving the SHEPWM harmonic elimination model of the NPC inverter.These efforts consists of optimizing the switching angle of the harmonic elimination model of the three-level NPC inverter using brainstorming algorithm;updating individuals through grouping,replacement,and creation operations;increasing the diversity of the population,and improving the calculation accuracy of the inverter SHEPWM harmonic elimination model;and analyzing the residual harmonic distribution law under unipolar modulation mode and verifying the accuracy of the algorithm by Matlab/Simulink simulation.The results show that the 5th,7th,11th,13th,and 3 times harmonic content in the output phase and line voltage is 0,the remaining lowest 3-4th harmonic becomes the dominant harmonic,and the remaining high-order harmonic content is low and can be negligible.In the case of higher harmonic requirements,there could be a selective elimination of such harmonics for the harmonic energy reduction.