Saif Bisma, Masood Uzma, Sarwar Adil, Ahmad Shafiq, Huang Liang-Yin, Liu Hwa-Dong
Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, 202002, India.
Industrial Engineering Department, College of Engineering, King Saud University, 11421, Riyadh, Saudi Arabia.
Sci Rep. 2024 Oct 19;14(1):24552. doi: 10.1038/s41598-024-75685-7.
Multilevel converters have gained significant popularity in medium-voltage and high-power applications due to their numerous advantages over traditional two-level converters. These advantages include reduced harmonic distortion, improved efficiency, and lower stress on power semiconductors. Selective harmonic elimination (SHE) is a modulation method that can be employed with multilevel converters to achieve high-quality output voltage waveforms. In this work, an extension of Broyden's method, known as the Quasi-Modified Newton Method, is implemented for selective harmonic elimination and accurate calculation of switching angles for a wide range of modulation indices. The proposed method is applied to cascaded H bridge inverters operating at levels 5, 7, and 9. The method offers simplicity, reduced computational burden, and faster convergence, making it easily implementable, reducing total harmonic distortion (THD), and reducing RMSE and MAD errors. The paper includes simulation and experimental results that validate the accuracy and effectiveness of the proposed approach.
多电平变换器由于相对于传统两电平变换器具有众多优势，在中压和大功率应用中已获得显著普及。这些优势包括降低谐波失真、提高效率以及降低功率半导体上的应力。选择性谐波消除（SHE）是一种可与多电平变换器一起使用以实现高质量输出电压波形的调制方法。在这项工作中，实现了Broyden方法的一种扩展，即准修正牛顿法，用于选择性谐波消除以及针对广泛的调制指数精确计算开关角。所提出的方法应用于5电平、7电平及9电平的级联H桥逆变器。该方法具有简单性、降低的计算负担和更快的收敛速度，使其易于实现，降低总谐波失真（THD），并降低均方根误差（RMSE）和平均绝对误差（MAD）。本文包括仿真和实验结果，验证了所提方法的准确性和有效性。
