直流电压降低时混合MMC器件损耗分布的最优控制

IF 4.2 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-05-15 DOI:10.1016/j.epsr.2025.111817

Maozeng Lu, Jinyi Yang, Yanlei Zhao, Zehao Liu

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引用次数: 0

摘要

混合模块化多电平变换器既可以在正常直流电压下工作，也可以在降低直流电压下工作。当混合模块多电平转换器（mmc）作为逆变器工作时，特别是在直流链路电压降低的情况下，半桥子模块（hbsm）中上部和底部igbt的功率损耗并不大，这导致它们的使用寿命差异很大。由于系统的可靠性依赖于寿命较低的器件，器件的可靠性将严重威胁变流器的安全可靠运行。为了解决这一问题，本文提出了一种基于两自由度（TDOF）控制的器件损耗分布优化方法，该方法包括HBSMs电容器电压的直流和纹波分量。首先，通过定量分析各hbsm的平均开关函数，计算了直流链路电压降低时混合MMC的器件损耗，并解释了器件损耗失衡加剧的原因。然后，分析了电容电压直流分量和纹波分量对HBSMs底部igbt的影响。在此基础上，利用降低直流电压方案所提供的臂输出电压冗余性，提出了一种基于直流和纹波分量调节HBSMs电容器电压的控制策略，以优化器件损耗分布。最后，仿真和实验结果验证了该方法的可行性和有效性。

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Optimal control of devices loss distribution for hybrid MMC operating with a reduced DC-link voltage

Hybrid modular multilevel converter can work under both the normal DC-link voltage and reduced DC-link voltage operations. Power losses on the upper and bottom IGBTs in half-bridge submodules (HBSMs) are not even when hybrid modular multilevel converters (MMCs) work as inverters especially under the reduced DC-link voltage, which results in a large difference in their lifetimes. Since the system reliability depends on the device with the low lifetime, the safe and reliable operation of the converter will be seriously threatened by the reliability of the devices. To address this issue, this paper proposes an optimization method for device loss distribution based on the two degree of freedom (TDOF) control, which includes the DC and ripple components of the HBSMs capacitor voltages. Firstly, device loss for hybrid MMC under the reduced DC-link voltage is calculated through analyzing of the average switching function of all HBSMs quantitatively, and the reason for worsening the imbalance of device losses is explained. Then, the influences of both the DC and ripple components of the HBSMs capacitor voltage on the bottom IGBTs in HBSMs are analyzed. Furthermore, taking advantage of the redundancy of arm output voltages provided by the reduced DC voltage scenario, a control strategy based on the DC and ripple component regulation of the HBSMs capacitor voltage is proposed to optimize the device loss distribution. Finally, Simulation and experimental results demonstrate the feasibility and validity of the proposed method.

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.