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Theoretical harmonic analysis of cascaded H-bridge inverter under hybrid pulse width multilevel modulation

机译：混合脉宽多级调制下级联H桥逆变器的理论谐波分析

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摘要

This study investigates the analytical approach for determining the spectral components of a hybrid pulse width modulation (HPWM) strategy for cascaded H-bridge (CHB) multilevel inverters. By decomposing the HPWM voltage into a staircase waveform and a non-sinusoidal pulse width modulation waveform and applying the one-dimensional Fourier series as well as double Fourier series methods, the closed-form solution for arbitrary level HPWM voltage is derived. Based on the derived solution, analysis of HPWM output with a changed modulation index is also performed, with good stability and control dynamic demonstrated. The spectral analytical expression is verified extensively by comparison of theoretical calculation results with those of the simulation and laboratory experiment, which coincide with each other very well. Furthermore, a brief switch function rotation balancing method for HPWM-based CHB inverter is utilised, and is also validated by experimental results.
机译：本研究调查了用于确定级联H桥（CHB）多电平逆变器的混合脉宽调制（HPWM）策略的频谱分量的分析方法。通过将HPWM电压分解为阶梯波形和非正弦脉冲宽度调制波形，并应用一维傅里叶级数和双傅里叶级数方法，得出了任意水平HPWM电压的闭式解。基于导出的解决方案，还对调制指数已更改的HPWM输出进行了分析，并证明了其良好的稳定性和控制动态性。通过将理论计算结果与模拟和实验室实验的结果进行比较，对光谱分析表达式进行了广泛验证，二者非常吻合。此外，本文还提出了一种基于HPWM的CHB逆变器的开关功能旋转平衡方法，并得到了实验结果的验证。

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