Assessment of Low-Loss Configurations for Efficiency Improvement in Hybrid Modular Multilevel Converters

Yumeng TIAN; Harith R. WICKRAMASINGHE; Pingyang SUN; Zixin LI; Josep POU; Georgios KONSTANTINOU

doi:10.1109/ACCESS.2021.3130588

Assessment of Low-Loss Configurations for Efficiency Improvement in Hybrid Modular Multilevel Converters

Yumeng TIAN^*, Harith R. WICKRAMASINGHE, Pingyang SUN, Zixin LI, Josep POU, Georgios KONSTANTINOU

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

13 Citations (Scopus)

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Abstract

Hybrid modular multilevel converters (HMMC) address the DC-fault blocking limitations of the half-bridge submodules (HB-SMs) of the standard MMC by combining HB-SMs with full-bridge submodules (FB-SMs). In order to improve the overall conversion efficiency, this article proposes two low-loss configurations for the HMMC. The main improvement in the proposed HMMCs is achieved by the combination of low-loss unipolar and low-loss bipolar SMs in the same arm of the HMMC. It is shown that the simplest structure (LLH1) can reduce the SM losses (switching and conduction losses in an SM) by 30% compared to the HMMC at the cost of limited fault blocking capabilities. The fully controlled structure (LLH2) reduces SM losses by 10% compared to the HMMC, and 30% compared to the FBSM-based MMC. These results represent an increase of 20% over the typical HBSM-based MMC for a converter (LLH2) that can provide fault-blocking capabilities. Assessment of efficiency in both HMMCs is provided over a range of operating conditions both in inverter and rectifier mode from an 800-MVA HVDC system model.

Original language	English
Pages (from-to)	158155-158166
Journal	IEEE Access
Volume	9
Online published	25 Nov 2021
DOIs	https://doi.org/10.1109/ACCESS.2021.3130588
Publication status	Published - 2021
Externally published	Yes

Funding

This work was supported by the Australian Research Council's Discovery Grant DP210102294.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Research Keywords

High-voltage direct current (HVDC)
Hybrid power electronics converters
Losses
Modular multilevel converter
Submodules/cells

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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abstract = "Hybrid modular multilevel converters (HMMC) address the DC-fault blocking limitations of the half-bridge submodules (HB-SMs) of the standard MMC by combining HB-SMs with full-bridge submodules (FB-SMs). In order to improve the overall conversion efficiency, this article proposes two low-loss configurations for the HMMC. The main improvement in the proposed HMMCs is achieved by the combination of low-loss unipolar and low-loss bipolar SMs in the same arm of the HMMC. It is shown that the simplest structure (LLH1) can reduce the SM losses (switching and conduction losses in an SM) by 30% compared to the HMMC at the cost of limited fault blocking capabilities. The fully controlled structure (LLH2) reduces SM losses by 10% compared to the HMMC, and 30% compared to the FBSM-based MMC. These results represent an increase of 20% over the typical HBSM-based MMC for a converter (LLH2) that can provide fault-blocking capabilities. Assessment of efficiency in both HMMCs is provided over a range of operating conditions both in inverter and rectifier mode from an 800-MVA HVDC system model.",

keywords = "High-voltage direct current (HVDC), Hybrid power electronics converters, Losses, Modular multilevel converter, Submodules/cells",

author = "Yumeng TIAN and WICKRAMASINGHE, {Harith R.} and Pingyang SUN and Zixin LI and Josep POU and Georgios KONSTANTINOU",

year = "2021",

doi = "10.1109/ACCESS.2021.3130588",

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TY - JOUR

T1 - Assessment of Low-Loss Configurations for Efficiency Improvement in Hybrid Modular Multilevel Converters

AU - TIAN, Yumeng

AU - WICKRAMASINGHE, Harith R.

AU - SUN, Pingyang

AU - LI, Zixin

AU - POU, Josep

AU - KONSTANTINOU, Georgios

PY - 2021

Y1 - 2021

N2 - Hybrid modular multilevel converters (HMMC) address the DC-fault blocking limitations of the half-bridge submodules (HB-SMs) of the standard MMC by combining HB-SMs with full-bridge submodules (FB-SMs). In order to improve the overall conversion efficiency, this article proposes two low-loss configurations for the HMMC. The main improvement in the proposed HMMCs is achieved by the combination of low-loss unipolar and low-loss bipolar SMs in the same arm of the HMMC. It is shown that the simplest structure (LLH1) can reduce the SM losses (switching and conduction losses in an SM) by 30% compared to the HMMC at the cost of limited fault blocking capabilities. The fully controlled structure (LLH2) reduces SM losses by 10% compared to the HMMC, and 30% compared to the FBSM-based MMC. These results represent an increase of 20% over the typical HBSM-based MMC for a converter (LLH2) that can provide fault-blocking capabilities. Assessment of efficiency in both HMMCs is provided over a range of operating conditions both in inverter and rectifier mode from an 800-MVA HVDC system model.

AB - Hybrid modular multilevel converters (HMMC) address the DC-fault blocking limitations of the half-bridge submodules (HB-SMs) of the standard MMC by combining HB-SMs with full-bridge submodules (FB-SMs). In order to improve the overall conversion efficiency, this article proposes two low-loss configurations for the HMMC. The main improvement in the proposed HMMCs is achieved by the combination of low-loss unipolar and low-loss bipolar SMs in the same arm of the HMMC. It is shown that the simplest structure (LLH1) can reduce the SM losses (switching and conduction losses in an SM) by 30% compared to the HMMC at the cost of limited fault blocking capabilities. The fully controlled structure (LLH2) reduces SM losses by 10% compared to the HMMC, and 30% compared to the FBSM-based MMC. These results represent an increase of 20% over the typical HBSM-based MMC for a converter (LLH2) that can provide fault-blocking capabilities. Assessment of efficiency in both HMMCs is provided over a range of operating conditions both in inverter and rectifier mode from an 800-MVA HVDC system model.

KW - High-voltage direct current (HVDC)

KW - Hybrid power electronics converters

KW - Losses

KW - Modular multilevel converter

KW - Submodules/cells

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JF - IEEE Access

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Assessment of Low-Loss Configurations for Efficiency Improvement in Hybrid Modular Multilevel Converters

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Research Keywords

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