An IGCT-based Multi-functional MMC System with Commutation and Switching

Xu, Chaoqun; Guo, Mengxue; Zhao, Biao; Tang, Bo; Yu, Zhanqing; Zhai, Dongling; Ren, Chunpin

doi:10.23919/epe20ecceeurope43536.2020.9215678

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…In addition, with the successful application of IGCT devices for DC power networks [23][24], the advantages of IGCT such as low cost, low loss, high reliability and good safety have become more evident. The IGCT-based DC-DC converter, with its advantages of large stand-alone capacity and high power density, is more suitable for high-capacity, grid-connected DC collection applications.…”

Section: Series Resonant Llc Circuitmentioning

confidence: 99%

Studies of large‐scale DC connected photovoltaic power system based on multi‐modular cascaded DC‐DC converter

Liu

Chen

Shi

et al. 2023

IET Generation Trans & Dist

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DC collection and transmission is one of the major development directions of large‐scale photovoltaic (PV) power system. In order to achieve low‐cost, high‐efficiency and long‐distance transmission of PV power, this paper adopted a DC grid‐connected topology by using multi‐modular cascaded DC‐DC converters, forming an input‐independent and output‐series (IIOS) system. In this system, an LLC type DC‐DC converter based on IGCT and magnetically integrated transformer was proposed in this paper, which can significantly increase the capacity, efficiency and power density of DC‐DC converter. And the equalization unit based on half‐bridge topology was adopted for the case of uneven irradiation of the PV inputs. In addition, this paper proposed an equalization control method based on the Nearest Level Modulation (NLM), which greatly simplifies the design of the acquisition and control system. Furthermore, the parametric design of a 50MW PV system was presented, and the simulation was carried out to verify the feasibility and advantages of the system in this paper. The proposed IIOS system is more suitable for high‐capacity, long‐distance PV power transmission, which can serve as a reference for the development of large‐scale photovoltaic systems.

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Section: Series Resonant Llc Circuitmentioning

confidence: 99%

Studies of large‐scale DC connected photovoltaic power system based on multi‐modular cascaded DC‐DC converter

Liu

Chen

Shi

et al. 2023

IET Generation Trans & Dist

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“…A direct implementation under MATLAB, with equations and a fixed time-step, has been chosen to enhance the model's performance. Many functions have been rewritten and adapted to the characteristics of the system: FIGURE 13 Flowchart describing the simulation of the converter at each time-step 1. The calculation of cell voltages, which depends on the switching states provided by the sorting algorithm.…”

Section: Implementation Of the Model Under Matlabmentioning

confidence: 99%

“…© 2021 The Authors. IET Power Electronics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology MMC-HVDC applications is being intensively investigated in China [11][12][13], where many multi-terminal HVDC links have been installed over the last ten years with a growing interest in coupling LCC technology with VSC-MMC solutions [14].…”

Section: Introductionmentioning

confidence: 99%

“…For such applications and because of the low switching frequency of the individual semiconductor power switches provided by the large number of levels, the replacement of the insulated-gate bipolar transistor (IGBT) by the integrated gatecommutated thyristor (IGCT) appears to be advantageous [5] because the IGCT has low on-state losses, inherent short-circuit failure-mode (SCFM) and higher reliability [6][7][8] with improved thermal cycling capabilities [9,10]. The use of this device for MMC-HVDC applications is being intensively investigated in China [11][12][13], where many multi-terminal HVDC links have been installed over the last ten years with a growing interest in coupling LCC technology with VSC-MMC solutions [14].…”

Section: Introductionmentioning

confidence: 99%

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Selection of an IGCT for multilevel converters dedicated to high‐voltage direct current grid connection of offshore wind‐farms

Ladoux

Sanchez

Cornet

et al. 2021

IET Power Electronics

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Grid connection of remote offshore wind-parks uses high-voltage direct current technology and in order to reduce costs and losses and maximise profitability, semiconductor power losses must be minimised. To properly choose the semiconductors, it is necessary to estimate their losses for a large number of operating conditions. This article deals with a modelling approach to calculate power losses for many such operating conditions, based on measured semiconductor characteristics and the chosen multilevel modulation strategy. The case of the integrated gate-commutated thyristor is considered because, for a given device rating, it is possible to select an integrated gate-commutated thyristor benefiting from the best trade-off between on-state losses and turn-off losses, thus minimising the power losses of the two end-stations.

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Electrothermal Modeling of IGCT: Application to Hybrid DC Circuit Breaker

Wang

Zhuang

et al. 2022

2022 6th International Conference on Green Energy and Applications (ICGEA)

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An IGCT-based Multi-functional MMC System with Commutation and Switching

Cited by 3 publications

References 19 publications

Studies of large‐scale DC connected photovoltaic power system based on multi‐modular cascaded DC‐DC converter

Studies of large‐scale DC connected photovoltaic power system based on multi‐modular cascaded DC‐DC converter

Selection of an IGCT for multilevel converters dedicated to high‐voltage direct current grid connection of offshore wind‐farms

Electrothermal Modeling of IGCT: Application to Hybrid DC Circuit Breaker

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