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A hybrid genetic algorithm for selective harmonic elimination control of a multilevel inverter with non-equal DC sources

机译:非等直流电源多电平逆变器选择性谐波消除控制的混合遗传算法

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摘要

The paper presents an optimal solution for eliminating pre-specified order of harmonics from a stepped waveform of a multilevel cascaded inverter topology with non-equal dc sources. The main challenge of solving the associated nonlinear equations, which are transcendental in nature and therefore have multiple solutions, is the convergence of the relevant algorithms and therefore an initial point selected considerably close to the exact solution is required. The paper discusses an efficient hybrid real coded genetic algorithm (HRCGA) that reduces significantly the computational burden resulting in fast convergence. An objective function describing a measure of effectiveness of eliminating selected order of harmonics while controlling the fundamental component is derived. Different cases including seven- and nine-level inverters with different values of modulation indices are reported. The theoretical findings are validated through simulation studies
机译:本文提出了一种最佳解决方案,用于从不等直流电源的多级级联逆变器拓扑的阶跃波形中消除预先指定的谐波次数。解决本质上是超验的并且因此具有多个解的相关联的非线性方程式的主要挑战是相关算法的收敛性,因此需要选择一个非常接近精确解的初始点。本文讨论了一种有效的混合实数编码遗传算法(HRCGA),该算法可显着减少计算负担并导致快速收敛。得出了一个目标函数,该函数描述了在控制基本分量时消除选定谐波次数的有效性的度量。报告了不同情况,包括具有不同调制指数值的七级和九级逆变器。理论结果通过仿真研究得到验证

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