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具有电容电压平衡能力的混合级联H桥逆变器工作范围的扩展

Extension of Operating Range in Hybrid Cascaded H-Bridge Inverters with Capacitor Voltage Balancing Capability.

作者信息

Tirupathi Abhilash, Pribadi Jonathan, Kim Min-Seok, Lee Dong-Choon

机构信息

Department of Electrical Engineering, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Republic of Korea.

出版信息

Sensors (Basel). 2024 Feb 3;24(3):991. doi: 10.3390/s24030991.

DOI:10.3390/s24030991
PMID:38339707
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10857524/
Abstract

In this article, a generalized control scheme is proposed to extend the operating range of three-phase hybrid cascaded H-bridge (HCHB) inverters into various voltage levels without necessitating alterations to the core structure or the integration of additional H-bridge submodules. This study addresses a critical challenge related to capacitor voltage drift at various modulation indices and power factors, which is a serious impediment to various applications. To overcome this challenge, a novel balancing control scheme has been developed based on the injection of two independent offset voltages to simultaneously control the DC-link and flying capacitors. A distinctive aspect of the proposed technique involves adjusting the common reference voltage to attain the nearest level in the same cluster, thereby mitigating the insufficiency of redundant switching states. The effectiveness of the proposed technique to regulate the capacitor voltages at various operating conditions has been verified through simulation and experimental results.

摘要

本文提出了一种通用控制方案，以将三相混合级联H桥（HCHB）逆变器的工作范围扩展到各种电压电平，而无需改变核心结构或集成额外的H桥子模块。本研究解决了与不同调制指数和功率因数下电容器电压漂移相关的关键挑战，这对各种应用来说是一个严重障碍。为克服这一挑战，基于注入两个独立的偏移电压来同时控制直流母线电容和飞跨电容，开发了一种新颖的平衡控制方案。所提技术的一个独特之处在于调整公共参考电压以达到同一簇中的最接近电平，从而减轻冗余开关状态的不足。通过仿真和实验结果验证了所提技术在各种运行条件下调节电容器电压的有效性。

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