Optimised Operations and Modulation Scheme for Simplified Seven-Level Hybrid-Clamped Converters

IF 1.7 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IET Power Electronics Pub Date : 2025-04-02 DOI:10.1049/pel2.70028

Mingzhe Wu, Jun Hao, Jiazhe Li, Qi Zhang, Yanyong Yang, Kehu Yang

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引用次数: 0

Abstract

Seven-level hybrid-clamped (7L-HC) converters are new and promising candidates for high-power medium-voltage applications. Their configurations can be simplified further by reducing one of the two flying capacitors per phase. However, such simplification significantly reduces the available redundant states, making it hard for dc-link capacitors balancing and operation optimisation. In this article, the optimised operations and a low switching frequency modulation scheme are proposed for S7L-HC converters. Various new switching states are explored to help reduce the switching frequency, facilitate the balance of switching frequency distributions and reduction of the dynamic voltage stress on switches. The proposed modulation based on an improved selective harmonic elimination pulse width modulation (PWM) can achieve voltage balancing for all capacitors under a low switching frequency. Simulation and experimental results verify the proposed operations and modulation scheme.

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简化七电平混合箝位变换器的优化操作和调制方案

七电平混合箝位（7L-HC）转换器是大功率中压应用的新候选器件。它们的结构可以通过减少每相两个飞行电容器中的一个来进一步简化。然而，这种简化大大减少了可用的冗余状态，使得直流链路电容器的平衡和操作优化变得困难。本文提出了S7L-HC变换器的优化操作和低开关频率调制方案。探索各种新的开关状态，有助于降低开关频率，促进开关频率分布的平衡，降低开关上的动态电压应力。提出了一种基于改进的选择性谐波消除脉宽调制（PWM）的调制方法，可以在低开关频率下实现所有电容器的电压平衡。仿真和实验结果验证了所提出的操作和调制方案。

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来源期刊

IET Power Electronics ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

5.50

自引率

10.00%

发文量

195

审稿时长

5.1 months

期刊介绍： IET Power Electronics aims to attract original research papers, short communications, review articles and power electronics related educational studies. The scope covers applications and technologies in the field of power electronics with special focus on cost-effective, efficient, power dense, environmental friendly and robust solutions, which includes: Applications: Electric drives/generators, renewable energy, industrial and consumable applications (including lighting, welding, heating, sub-sea applications, drilling and others), medical and military apparatus, utility applications, transport and space application, energy harvesting, telecommunications, energy storage management systems, home appliances. Technologies: Circuits: all type of converter topologies for low and high power applications including but not limited to: inverter, rectifier, dc/dc converter, power supplies, UPS, ac/ac converter, resonant converter, high frequency converter, hybrid converter, multilevel converter, power factor correction circuits and other advanced topologies. Components and Materials: switching devices and their control, inductors, sensors, transformers, capacitors, resistors, thermal management, filters, fuses and protection elements and other novel low-cost efficient components/materials. Control: techniques for controlling, analysing, modelling and/or simulation of power electronics circuits and complete power electronics systems. Design/Manufacturing/Testing: new multi-domain modelling, assembling and packaging technologies, advanced testing techniques. Environmental Impact: Electromagnetic Interference (EMI) reduction techniques, Electromagnetic Compatibility (EMC), limiting acoustic noise and vibration, recycling techniques, use of non-rare material. Education: teaching methods, programme and course design, use of technology in power electronics teaching, virtual laboratory and e-learning and fields within the scope of interest. Special Issues. Current Call for papers: Harmonic Mitigation Techniques and Grid Robustness in Power Electronic-Based Power Systems - https://digital-library.theiet.org/files/IET_PEL_CFP_HMTGRPEPS.pdf