A Novel Hexagonal Switched Capacitor Unit (HSCU) Design With Seven-Level Multilevel Inverter Topology

IF 1.8 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Circuit Theory and Applications Pub Date : 2025-02-13 DOI:10.1002/cta.4469

Murat Karakılıç

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Abstract

In this paper, a new switched capacitor (SC) unit is proposed, which provides a solution for the multiple DC voltage requirement of multi-level inverters (MLIs). The proposed hexagonal switched capacitor unit (HSCU) contains SCs that have self-balancing ability and do not require any additional circuits. HSCU provides three voltage boosts using only one DC voltage source with four power switches, two capacitors, and two discrete diodes. A comparison with related topologies in the literature indicates that the proposed topology requires considerably fewer power devices than others. To suppress impulsive charging currents in the capacitors, a soft charging cell (SCC) is utilized. Experimental results demonstrate that the SCC effectively suppresses current peaks, contributing to improved circuit performance. In addition, the proposed 7L SC-MLI has successfully passed the simulation and experimental realization tests with nearest level control (NLC) modulation techniques and sinusoidal pulse width modulation (SPWM) modulation techniques. Response to dynamic changes in frequency, modulation index (MI) and load have been verified through tests. Power loss analysis was performed in PLECS software, and the efficiency was found to be 96.45%.

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一种具有七电平多电平逆变器拓扑结构的新型六角形开关电容单元（HSCU）设计

本文提出了一种新型的开关电容（SC）单元，为多级逆变器的多重直流电压需求提供了一种解决方案。所提出的六方开关电容单元（HSCU）包含具有自平衡能力且不需要任何额外电路的sc。HSCU仅使用一个直流电压源，四个电源开关，两个电容器和两个分立二极管提供三个电压提升。与文献中相关拓扑的比较表明，所提出的拓扑所需的功率器件比其他拓扑少得多。为了抑制电容器中的脉冲充电电流，采用了软充电电池（SCC）。实验结果表明，SCC有效地抑制了电流峰值，提高了电路性能。此外，所提出的7L SC-MLI已成功地通过了最近电平控制（NLC）调制技术和正弦脉宽调制（SPWM）调制技术的仿真和实验实现测试。通过试验验证了该系统对频率、调制指数（MI）和负载动态变化的响应。在PLECS软件中进行功耗分析，效率为96.45%。

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来源期刊

International Journal of Circuit Theory and Applications 工程技术-工程：电子与电气

CiteScore

3.60

自引率

34.80%

发文量

277

审稿时长

4.5 months

期刊介绍： The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering. Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices. Contributions to CAD and simulation are welcome.