A capacitance reduction method of hybrid modular multilevel converter based on multi-harmonic voltage injection

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-05-28 DOI:10.1049/pel2.12722

Hongxu Li, Qin Wang, Qunfang Wu, Lan Xiao, Jinbo Li, Qi Chen

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Abstract

In a modular multilevel converter (MMC) system, the sub-module (SM) capacitors account for a large proportion of cost, volume and weight. Increasing modulation index (m) is an effective method to reducing the capacitance. Traditional MMC based on half-bridge SM (HBSM) cannot boosting m while the hybrid MMC composed of HBSMs and full-bridge sub-modules (FBSM) can increase the m. The negative voltage is required when hybrid MMC works at the boosted m, which is only provided by the FBSMs because the HBSMs cannot output negative voltage. Therefore, appropriate control strategies are needed to achieve the normal operation of hybrid MMC under boosted m. This paper presents a control method suitable for hybrid MMC with high m based on multi-harmonic voltage injection. The m is increased to 1.41 with the proposed multi-harmonic voltage injection. Compared with the HBSM-MMC, the proposed method reduces the total capacitance by more than 32%. Boosting m also reduces the RMS and peak value of the arm current by 18%. A comprehensive comparison was presented to demonstrate the cost and effect. Simulation and experiment verified the proposed method.

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基于多谐波电压注入的混合模块化多电平转换器电容降低方法

在模块化多电平转换器（MMC）系统中，子模块（SM）电容器占成本、体积和重量的很大比例。提高调制指数（m）是减少电容的有效方法。传统的基于半桥 SM（HBSM）的 MMC 无法提高 m，而由 HBSM 和全桥子模块（FBSM）组成的混合 MMC 则可以提高 m。因此，需要适当的控制策略来实现混合 MMC 在升压 m 下的正常运行。本文提出了一种基于多谐波电压注入的控制方法，适用于高 m 的混合 MMC。通过多谐波电压注入，m 值提高到了 1.41。与 HBSM-MMC 相比，所提出的方法将总电容降低了 32% 以上。增强 m 还能将臂电流的有效值和峰值降低 18%。对成本和效果进行了综合比较。仿真和实验验证了所提出的方法。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.