A modified harmonic minimization scheme for seven-level CHB multilevel inverter with improved voltage harmonic profile and grid code satisfaction

IF 3.2 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Aeu-International Journal of Electronics and Communications Pub Date : 2025-09-03 DOI:10.1016/j.aeue.2025.156024

Samudra Panda , Sourabh Kundu , Subrata Banerjee

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引用次数: 0

Abstract

In this study a modified selective-harmonic-minimization pulse-amplitude-modulation (SHM PAM) scheme is proposed for a 7-level cascaded H-bridge (CHB) multilevel inverter (MLI). The proposed scheme minimizes various lower order harmonics of inverter line voltage, with automatic elimination of the 5th & its higher odd order harmonic components. The modified modulation scheme successfully satisfies six key grid code standards using a 7-level phase voltage waveform, designed based on the proposed angular constraint. The cost function, used to determine the optimized switching angles and per-unit voltages of the proposed voltage pattern, is formulated with a comparatively small number of variables; thereby simplifying and accelerating the overall computational process. This feature facilitates the seamless implementation of the proposed scheme in real-time scenarios. The applicability of the proposed scheme is validated through MATLAB-simulation studies & experimental tests on a 3-phase 7-level CHB MLI laboratory setup under various resistive & inductive loading conditions. Finally, the effectiveness of the proposed scheme is assessed through a comparative study with existing works, considering the number of optimization variables, the number of switching angles, and compliance with grid code standards.

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一种改进的七电平CHB多电平逆变器谐波最小化方案，提高了电压谐波分布和电网编码的满意度

针对7电平级联h桥（CHB）多电平逆变器（MLI），提出了一种改进的选择性最小谐波脉冲幅度调制（SHM PAM）方案。该方案最大限度地减少了逆变器线路电压的各种低阶谐波，并自动消除了5阶的高奇阶谐波分量。改进后的调制方案使用基于所提出的角约束设计的7级相电压波形成功地满足了6个关键电网编码标准。成本函数用于确定所提电压模式的最佳开关角度和单位电压，其变量数量相对较少；从而简化和加速整个计算过程。此特性有助于在实时场景中无缝实施所提出的方案。通过在三相7级CHB MLI实验室装置上的matlab仿真研究和实验测试，验证了该方案在各种电阻和电感负载条件下的适用性。最后，结合优化变量的数量、切换角度的数量以及是否符合电网规范标准，通过与现有方案的对比研究来评估所提方案的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Aeu-International Journal of Electronics and Communications 工程技术-电信学

CiteScore

6.90

自引率

18.80%

发文量

292

审稿时长

4.9 months

期刊介绍： AEÜ is an international scientific journal which publishes both original works and invited tutorials. The journal''s scope covers all aspects of theory and design of circuits, systems and devices for electronics, signal processing, and communication, including: signal and system theory, digital signal processing network theory and circuit design information theory, communication theory and techniques, modulation, source and channel coding switching theory and techniques, communication protocols optical communications microwave theory and techniques, radar, sonar antennas, wave propagation AEÜ publishes full papers and letters with very short turn around time but a high standard review process. Review cycles are typically finished within twelve weeks by application of modern electronic communication facilities.