Analysis and Injection Control of Circulating Current for Modular Multilevel Converters

Wang, Jun; Han, Xu; Ma, Hao; Bai, Zhihong

doi:10.1109/tie.2018.2808901

Cited by 80 publications

(37 citation statements)

References 25 publications

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“…Modular multilevel converters (MMCs) are another type of circuit that can realize five-level output voltage (Wang et al, 2019;Xu et al, 2019). In a way, MMCs are an extension of the earlier multilevel circuits based on the flying capacitors, with the exception that MMCs are much more feasible in higher voltage levels (Dekka et al, 2017).…”

Section: Topologies Of Five-level Front-end Convertersmentioning

confidence: 99%

Review of Five-Level Front-End Converters for Renewable-Energy Applications

et al. 2020

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Section: Topologies Of Five-level Front-end Convertersmentioning

confidence: 99%

Review of Five-Level Front-End Converters for Renewable-Energy Applications

et al. 2020

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“…This is while most recent studies of the same field have been unable to provide such mitigations in harmonic components of arm currents. For example, reference [33] proposes a unified on-line calculation scheme by using the instantaneous information of MMC in order to achieve different circulating current injection targets under different conditions. In this regard, four circulating current control targets have been considered.…”

Section: Gate Signalsmentioning

confidence: 99%

Control of MMC-Based STATCOM as an Effective Interface between Energy Sources and the Power Grid

Shahnazian

Adabi

et al. 2019

Electronics

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This paper presents a dynamic model of modular multilevel converters (MMCs), which are considered as an effective interface between energy sources and the power grid. By improving the converter performance, appropriate reactive power compensation is guaranteed. Modulation indices are calculated based on detailed harmonic evaluations of both dynamic and steady-state operation modes, which is considered as the main contribution of this paper in comparison with other methods. As another novelty of this paper, circulating current control is accomplished by embedding an additional second harmonic component in the modulation process. The proposed control method leads to an effective reduction in capacitor voltage fluctuation and losses. Finally, converter’s maximum stable operation range is modified, which provides efficiency enhancements and also stability assurance. The proficiency and functionality of the proposed controller are demonstrated through detailed theoretical analysis and simulations with MATLAB/Simulink.

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“…5a-d show current interruption performance of the proposed MMC HVDC system derived from the simulation in Section 7, where the dc line short circuit fault occurs on the dc side of the MMC with the different fault distances l m . The different arm inductances including 1 and 20 mH are considered, respectively, where the arm inductance L s is normally selected around the order of mH for the HVDC system [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Fig.…”

Section: Three-phase Current Interruption Momentmentioning

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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Analysis and Injection Control of Circulating Current for Modular Multilevel Converters

Cited by 80 publications

References 25 publications

Review of Five-Level Front-End Converters for Renewable-Energy Applications

Review of Five-Level Front-End Converters for Renewable-Energy Applications

Control of MMC-Based STATCOM as an Effective Interface between Energy Sources and the Power Grid

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

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