CAJ | 학술논문

为限制级联多电平逆变器输出电压谐波,提出一种改进粒子群优化(PSO)算法.在考虑三倍次谐波的情况下,给出最优化阶梯波法的目标函数.粒子群优化算法的惯性权重按负反正切规律变化,加速常数按反正切规律变化.通过提高算法前期全局探索能力和后期局部开发能力,算法搜索能力增强,而算法计算量几乎未增加.分析该方法的参数范围和粒子轨迹收敛速度,并将该方法应用于十一电平逆变器谐波限制问题,获得较佳的开关角设置方案,表明该方法具有优良的收敛性能.
위한제급련다전평역변기수출전압해파,제출일충개진입자군우화(PSO)산법.재고필삼배차해파적정황하,급출최우화계제파법적목표함수.입자군우화산법적관성권중안부반정절규률변화,가속상수안반정절규률변화.통과제고산법전기전국탐색능력화후기국부개발능력,산법수색능력증강,이산법계산량궤호미증가.분석해방법적삼수범위화입자궤적수렴속도,병장해방법응용우십일전평역변기해파한제문제,획득교가적개관각설치방안,표명해방법구유우량적수렴성능.
To reduce the output voltage harmonic of cascaded multilevel inverters,a sort of modified Particle Swarm Optimization (PSO) algorithm is put forward.The objective function of staircase modulation is given while the triple harmonics are considered.The inertia weight changes with negative arc tangent function while the acceleration constants change with arc tangent function.The searching ability of the algorithm is improved with scarcely increased computational cost by improving the global exploration ability during the former period and the local exploitation ability during the latter period.The limitation of parameters and the convergence rate of particle trajectories are analyzed.This method is applied to the harmonic reduction problem of the 11-level inverter,and better setting of switching angles are obtained,which validates that this method possesses strong convergence capability.