Valve-side Single-phase-to-ground Fault Analysis in Bipolar MMC-HVDC Systems with Hybrid SMs

Pingyang Sun; Gen Li; Hongyi Wang; Jun Liang; Georgios Konstantinou

doi:10.1109/TPWRD.2024.3429783

Valve-side Single-phase-to-ground Fault Analysis in Bipolar MMC-HVDC Systems with Hybrid SMs

Pingyang Sun, Gen Li^*, Hongyi Wang, Jun Liang, Georgios Konstantinou

^*Corresponding author for this work

Research output: Contribution to journal › Letter › peer-review

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Abstract

This letter presents a comprehensive fault analysis for a modular multilevel converter high-voltage direct current (MMC-HVDC) system with hybrid half-bridge submodules (HBSMs) and full-bridge SMs (FBSMs) under valve-side single-phase-to-ground (SPG) faults. The analysis shows protection for upper arms is necessary due to the inevitable upper arm overvoltage. It further specifies that the proportion of FBSMs utilized in each arm should be at least 86.6% of the available voltage to safely clear valve-side SPG faults without overvoltage in the lower arms. The accuracy of the theoretical analysis is validated in the positive pole of a bipolar MMC-HVDC system with different ratios of FBSMs modelled in PSCAD/EMTDC.

Original language	English
Journal	IEEE Transactions on Power Delivery
Volume	39
Issue number	5
Number of pages	4
ISSN	0885-8977
DOIs	https://doi.org/10.1109/TPWRD.2024.3429783
Publication status	Published - 2024

Keywords

Valve-side ac fault
Single-phase fault
Hybrid SMs
HVDC
MMC

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title = "Valve-side Single-phase-to-ground Fault Analysis in Bipolar MMC-HVDC Systems with Hybrid SMs",

abstract = "This letter presents a comprehensive fault analysis for a modular multilevel converter high-voltage direct current (MMC-HVDC) system with hybrid half-bridge submodules (HBSMs) and full-bridge SMs (FBSMs) under valve-side single-phase-to-ground (SPG) faults. The analysis shows protection for upper arms is necessary due to the inevitable upper arm overvoltage. It further specifies that the proportion of FBSMs utilized in each arm should be at least 86.6% of the available voltage to safely clear valve-side SPG faults without overvoltage in the lower arms. The accuracy of the theoretical analysis is validated in the positive pole of a bipolar MMC-HVDC system with different ratios of FBSMs modelled in PSCAD/EMTDC.",

keywords = "Valve-side ac fault, Single-phase fault, Hybrid SMs, HVDC, MMC",

author = "Pingyang Sun and Gen Li and Hongyi Wang and Jun Liang and Georgios Konstantinou",

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doi = "10.1109/TPWRD.2024.3429783",

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TY - JOUR

T1 - Valve-side Single-phase-to-ground Fault Analysis in Bipolar MMC-HVDC Systems with Hybrid SMs

AU - Sun, Pingyang

AU - Li, Gen

AU - Wang, Hongyi

AU - Liang, Jun

AU - Konstantinou, Georgios

PY - 2024

Y1 - 2024

N2 - This letter presents a comprehensive fault analysis for a modular multilevel converter high-voltage direct current (MMC-HVDC) system with hybrid half-bridge submodules (HBSMs) and full-bridge SMs (FBSMs) under valve-side single-phase-to-ground (SPG) faults. The analysis shows protection for upper arms is necessary due to the inevitable upper arm overvoltage. It further specifies that the proportion of FBSMs utilized in each arm should be at least 86.6% of the available voltage to safely clear valve-side SPG faults without overvoltage in the lower arms. The accuracy of the theoretical analysis is validated in the positive pole of a bipolar MMC-HVDC system with different ratios of FBSMs modelled in PSCAD/EMTDC.

AB - This letter presents a comprehensive fault analysis for a modular multilevel converter high-voltage direct current (MMC-HVDC) system with hybrid half-bridge submodules (HBSMs) and full-bridge SMs (FBSMs) under valve-side single-phase-to-ground (SPG) faults. The analysis shows protection for upper arms is necessary due to the inevitable upper arm overvoltage. It further specifies that the proportion of FBSMs utilized in each arm should be at least 86.6% of the available voltage to safely clear valve-side SPG faults without overvoltage in the lower arms. The accuracy of the theoretical analysis is validated in the positive pole of a bipolar MMC-HVDC system with different ratios of FBSMs modelled in PSCAD/EMTDC.

KW - Valve-side ac fault

KW - Single-phase fault

KW - Hybrid SMs

KW - HVDC

KW - MMC

U2 - 10.1109/TPWRD.2024.3429783

DO - 10.1109/TPWRD.2024.3429783

M3 - Letter

SN - 0885-8977

VL - 39

JO - IEEE Transactions on Power Delivery

JF - IEEE Transactions on Power Delivery

IS - 5

ER -

Valve-side Single-phase-to-ground Fault Analysis in Bipolar MMC-HVDC Systems with Hybrid SMs

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