Common‐mode voltage injection‐based nearest level modulation with loss reduction for modular multilevel converters

Zhou, Weihao; Dong, Yufei; Yang, Heya; Li, Wuhua; He, Xiuyu; Hu, Jiabing; Yuan, Xiaoming

doi:10.1049/iet-rpg.2015.0438

Cited by 19 publications

(8 citation statements)

References 26 publications

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“…From (11) and (17), it is interesting to note that the ratio of u a,2f has the same mathematical expression as that of Δu C . Thus, u a,2f with the proposed ADCM is also higher than that with the conventional NLM.…”

Section: Circulating Current Suppressionmentioning

confidence: 99%

“…The equivalent switching frequency of MMC is the sum of sub-module switching transients. According to [17], when the sorting scheme is adopted, the total sub-module switching transients decrease with the reduction of sub-module number N. In the proposed modulation, the sub-module number N is minimised. As a result, the switching losses of MMCs are also reduced lightly.…”

Section: Loss Improvement Of MMC With Adcmmentioning

confidence: 99%

“…For the MMC conduction losses, they are mainly affected by the conduction voltage drop of the power device, the arm current and the sub-module number [17]. Since the arm current is determined by the terminal voltage and output power of MMC, it is difficult to optimise the conduction losses by adjusting the arm current.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the efficiency can be improved by reducing the sub‐module numbers. In [17, 21], the required sub‐module number is decreased with the common‐mode voltage injection‐based nearest level modulation. However, this method can be only used in MMCs without the common mode path.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive DC voltage component modulation of sub‐modules in modular multilevel converters for efficiency optimisation during wide AC voltage range

Dong

Yang

et al. 2018

IET Power Electronics

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Realisation of high-efficiency modular multilevel converters (MMCs) during wide AC grid voltage variation is a significant challenge for the voltage-source-converter based high-voltage direct-current system. In this study, the DC component of the sub-module output voltage is investigated to be a new control freedom by building the inherent relationship between the DC voltage component and active sub-module number. Then, the effect of AC voltage on DC voltage component is explored. The adaptive DC voltage component modulation is proposed to dynamically regulate the active sub-module numbers during wide AC voltage variation, resulting in the improved MMC conversion efficiency. Moreover, the detailed performance analysis shows that the adoption of the proposed modulation brings little effect on the sub-module capacitor voltage/current ripple, circulating current suppression as well as the AC and DC terminal voltages. Finally, the simulation and experiment results show that the adaptive DC voltage component modulation is effective to reduce the power losses during a wide AC voltage range. Nomenclature U 1 amplitude of AC voltages U dc DC terminal voltage u jp , u jn upper/lower arm voltages of phase j (j = a, b, c) i jp , i jn upper/lower arm currents of phase j (j = a, b, c) u sm sub-module output voltage u sm,dc , u sm,ac DC/AC component of u sm u C sub-module capacitor voltage U C rated sub-module capacitor voltage Δu C sub-module capacitor voltage ripple Δu C1st , Δu C2nd first-/second-order capacitor voltage ripple of Δu C u sm,2f second-order voltage component of u sm u a,2f second-order voltage component of phase a i C sub-module capacitor current i C1st , i C2nd first-/second-order capacitor current of Δi C i cir circulating current of MMC N active sub-module number per arm N rated rated active sub-module number per arm Σu C sum of active sub-module capacitor voltages per arm IET Power Electron.

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Section: Circulating Current Suppressionmentioning

confidence: 99%

Section: Loss Improvement Of MMC With Adcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adaptive DC voltage component modulation of sub‐modules in modular multilevel converters for efficiency optimisation during wide AC voltage range

Dong

Yang

et al. 2018

IET Power Electronics

Self Cite

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“…Common‐mode voltage injection‐based NLM method is presented by Zhou et al, which reduces conduction and switching losses. Feasibility of proposed strategy is validated with simulation cases under normal and unbalanced AC fault conditions.…”

Section: Control Conceptmentioning

confidence: 99%

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

Kurtoğlu

Eroğlu

Arslan

et al. 2018

Int Trans Electr Energ Syst

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Summary The modular multilevel converters (MMCs) are frequently preferred for medium and high power energy conversion systems thanks to their modular structure and high quality output waveform. The remarkable studies related to the MMC have been carried out in recent years, which are mainly focused on its topology, control, or application. In this paper, MMC circuit topologies consisting of traditional submodule cells and new proposed configurations are introduced, and their control process, modulation techniques, and application areas are discussed in order to provide the readers the current state of the art of MMC technology. A wide part of this article is devoted to demonstrate the recent contributions arising in MMC studies. In this context, this paper not only outlines the circuit topology, control objectives, and applications of the MMC but also presents a comprehensive review, principally in terms of the latest developments of it. Ultimately, detailed proposals and new possible topics are provided to drive future expectations of MMC technology.

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The Voltage Fluctuation Strategy of MMC Submodule Injected with Common Mode Voltage and Circulation

Zhao

Fang

Guo

et al. 2021

Advances in Intelligent Automation and Soft Computing

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Common‐mode voltage injection‐based nearest level modulation with loss reduction for modular multilevel converters

Cited by 19 publications

References 26 publications

Adaptive DC voltage component modulation of sub‐modules in modular multilevel converters for efficiency optimisation during wide AC voltage range

Adaptive DC voltage component modulation of sub‐modules in modular multilevel converters for efficiency optimisation during wide AC voltage range

Recent contributions and future prospects of the modular multilevel converters: A comprehensive review

The Voltage Fluctuation Strategy of MMC Submodule Injected with Common Mode Voltage and Circulation

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