Optimized Design of Full-Bridge Modular Multilevel Converter With Low Energy Storage Requirements for HVdc Transmission System

Zhao, Cong; Li, Yaohua; Li, Zixin; Wang, Ping; Ma, Xun; Luo, Yan

doi:10.1109/tpel.2017.2660532

Cited by 79 publications

(26 citation statements)

References 29 publications

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“…Substituting (6) and (7) into (8), the natural RMS of arm current without circulating current control is…”

Section: A Natural Circulating Currentmentioning

confidence: 99%

“…It has become a mainstay for voltage source converter based high voltage direct current (VSC-HVDC) transmission, especially in long distance transmission, asynchronous power grid interconnection and multi-terminal grid applications [1]- [4]. Currently, the important optimal objectives for MMC are to reduce the costs and losses [5], [6]. The submodule (SM) capacitor accounts for almost half of the SM volume and weight, and one third of the cost.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Objective Genetic Algorithm Based Coordinated Second- and Third-Order Harmonic Voltage Injection in Modular Multilevel Converter

Lin

et al. 2020

IEEE Access

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The submodule (SM) capacitor voltage ripple and the root mean square (RMS) of the arm current are related to the costs and losses of the modular multilevel converter (MMC). The optimization issues have received great attention. The second-order circulating current control and third-order harmonic voltage injection are two conventional optimization methods, but the existing research neglects their coupling effects. In this paper, these two methods are comprehensively investigated and coordinately combined. First, the various performances of MMC under multiple injections are characterized. Then, a multi-objective optimization model considering the output capability of arm voltage and the energy balance of capacitors, is proposed to reduce the SM capacitor voltage ripple and the RMS of the arm current. The amplitudes and phases of the injected second-and third-order harmonic voltages are designed coordinately by genetic algorithm. The simulation and experimental results have validated the effectiveness and feasibility of the proposed method. INDEX TERMS Modular multilevel converter, third-order harmonic voltage injection, circulating current control, multi-objective optimization, genetic algorithm. He is currently a Postdoctoral Fellow and a Research Assistant with the State Key Laboratory of Advanced Electromagnetic Engineering and Technology, SEEE, HUST. His research interests include flexible ac and dc transmission and distribution technology, power quality control, and multilevel converter.

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“…Substituting (6) and (7) into (8), the natural RMS of arm current without circulating current control is…”

Section: A Natural Circulating Currentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Objective Genetic Algorithm Based Coordinated Second- and Third-Order Harmonic Voltage Injection in Modular Multilevel Converter

Lin

et al. 2020

IEEE Access

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“…Also, the expensive ac CB and dc CB may be replaced with the cheap mechanical switch because of the current interruption capability of the proposed MMC HVDC system, which can greatly save cost. In comparison with the other MMC HVDC systems [13][14][15][16][17][18][19][20][21][22][23][24][25], the proposed MMC HVDC system can interrupt the current with simple circuit configuration and less number of power devices. System simulations and experimental results presented in Sections 7 and 8, respectively, show the effectiveness of the proposed scheme.…”

Section: Introductionmentioning

confidence: 99%

Thyristor‐based modular multilevel converter‐HVDC systems with current interruption capability

Wang

Deng

Liu

et al. 2019

IET Power Electronics

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The modular multilevel converter (MMC) is an attractive option for high-voltage direct-current (HVDC) transmission applications. The dc line short-circuit fault is one of the key challenges for the HVDC system. In this study, a thyristor-based MMC with current interruption capability is proposed, where the IGBT with anti-parallel thyristor is employed to realise current interruption with the advantages of the simple circuit configuration and less number of power electronic devices. Also, the protection scheme for the thyristor-based MMC HVDC system under dc lines short-circuit faults is also proposed, where the fault current can be quickly interrupted by the thyristor-based MMC. The proposed thyristor-based MMC HVDC system is not necessary to be disconnected with the ac grid during the dc-line fault, where the MMC can continue operating and can be used for reactive power regulation before the fault is cleared, and therefore improves the system performance. The simulation and experimental studies are conducted, and the results verify the effectiveness of the proposed thyristor-based MMC and control scheme.

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“…Regarding the physical volume of the MMC itself, it is found that a major contributor is the submodule capacitance [19]- [22]. The cell capacitors occupy more than half of the submodule volume.…”

Section: Introductionmentioning

confidence: 99%

Implications of Capacitor Voltage Imbalance on the Operation of the Semi-Full-Bridge Submodule

Heinig

Jacobs

Ilves

et al. 2019

IEEE Trans. Power Electron.

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Optimized Design of Full-Bridge Modular Multilevel Converter With Low Energy Storage Requirements for HVdc Transmission System

Cited by 79 publications

References 29 publications

Multi-Objective Genetic Algorithm Based Coordinated Second- and Third-Order Harmonic Voltage Injection in Modular Multilevel Converter

Multi-Objective Genetic Algorithm Based Coordinated Second- and Third-Order Harmonic Voltage Injection in Modular Multilevel Converter

Thyristor‐based modular multilevel converter‐HVDC systems with current interruption capability

Implications of Capacitor Voltage Imbalance on the Operation of the Semi-Full-Bridge Submodule

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