An Advanced Fault Control of Transformerless Modular Multilevel Converters in AC/DC Hybrid Distribution Networks Under the Single-Phase Grounding Fault

Li, Yuze; Pei, Xuejun; Yang, Minghong; Lin, Xin; Li, Zhengtian

doi:10.1109/tpwrd.2020.2997797

Cited by 23 publications

(6 citation statements)

References 25 publications

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“…v o'o is the potential to the ground of the DC side neutral point. The voltage equations of AC and DC side can be obtained by making the sum and difference of (2).…”

Section: Dynamics Of the Transformerless MMCmentioning

confidence: 99%

“…Modular multilevel converter (MMC) is an emerging technology that integrates power electronics converters and control circuitry. In the medium AC and DC hybrid distribution network applications, the transformerless MMC has become a promising alternative topology [1][2][3]. The transformerless MMC for medium power distribution system should reduce the size, weight, and volume because the weight of the transformer is 3000-4000 kg per 1 MVA.…”

Section: Introductionmentioning

confidence: 99%

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An improved four‐layer capacitor voltage control strategy combined with arm current control for transformerless modular multilevel converters

Liú¹,

Xiong²,

Fan³

et al. 2022

IET Power Electronics

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In order to improve the performance of the transformerless modular multilevel converters (MMC) under AC and DC grid fault conditions, this paper proposes an improved fourlayer capacitor voltage control strategy combined with arm current control. The proposed control strategy consists of overall submodule capacitor voltage averaging control, legbalancing control with flexible weight factor W, arm-balancing control with zero-sequence suppression, and inner-arm individual balancing control. The new concept of weight factor W for leg-balancing control is also originated, considering negative-sequence current and DC circulating current jointly from power point of view. The proposed approach effectively realizes the capacitor voltage balance, ac-side current tracking, and unwanted circulating current elimination. The practical implementation of the proposed control strategy and the experimental results from a downscale three-phase transformerless MMC prototype are presented to validate the performance of the proposed four-layer capacitor voltage control strategy under grid faults.

show abstract

“…v o'o is the potential to the ground of the DC side neutral point. The voltage equations of AC and DC side can be obtained by making the sum and difference of (2).…”

Section: Dynamics Of the Transformerless MMCmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An improved four‐layer capacitor voltage control strategy combined with arm current control for transformerless modular multilevel converters

Liú¹,

Xiong²,

Fan³

et al. 2022

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…According to the above objective function, the mathematical model of distribution network planning is constructed as an economic model [16] . At the same time, the data model is optimized by toughness enhancement technology, and the specific processing process is as follows [17] .…”

Section: Construction Of Distribution Network Planning Mathematical Modelmentioning

confidence: 99%

Research on energy storage depth planning of AC / DC distribution network based on toughness enhancement technology

Hu¹

2021

E3S Web Conf.

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At present, due to the abnormal objective function setting result of AC / DC distribution network energy storage depth planning method, the operation cost of power supply network has been increased frequently. Therefore, the energy storage depth planning method of AC / DC distribution network based on toughness enhancement technology is designed. The minimum peak valley difference, maximum load rate and minimum load change are taken as the energy storage depth planning objectives of AC / DC distribution network. The economic mathematical model of distribution network planning is constructed by using toughness enhancement technology and objective function to complete the in-depth planning of distribution network. So far, the energy storage depth planning method of AC / DC distribution network based on toughness enhancement technology has been completed. Simulation experiment has been constructed. Through the comparison, it can be seen that this method has better effect than the original method, possessing stronger control ability for operation components.

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“…It is noteworthy that, in the analysis of the three-phase systems in the αβ frame, a three-phase system can be modeled to two single-input single-output (SISO) single-phase systems, and then analyzed like a single-phase system, such as the three-phase systems in [10,14,24,27,28], and the relevant conclusions can be applied to singlephase and three-phase systems. In addition, there are still many studies based on single-phase systems in recent years, such as the fault control for modular multilevel converters (MMCs) in distribution network [36], unbalanced compensation of three-phase distribution systems using single-phase inverters [37,38], single-phase photovoltaic (PV) batteryenergy storage (BES) based hybrid systems [39,40], etc. Hence, a single-phase system is selected as the research object in this paper.…”

Section: Introductionmentioning

confidence: 99%

Passivity-based stability analysis of parallel single-phase inverters with hybrid reference frame control considering PLL effect

Han

Yang

et al. 2022

International Journal of Electrical Power & Energy Systems

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An Advanced Fault Control of Transformerless Modular Multilevel Converters in AC/DC Hybrid Distribution Networks Under the Single-Phase Grounding Fault

Cited by 23 publications

References 25 publications

An improved four‐layer capacitor voltage control strategy combined with arm current control for transformerless modular multilevel converters

An improved four‐layer capacitor voltage control strategy combined with arm current control for transformerless modular multilevel converters

Research on energy storage depth planning of AC / DC distribution network based on toughness enhancement technology

Passivity-based stability analysis of parallel single-phase inverters with hybrid reference frame control considering PLL effect

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