Analysis and Protection Scheme of Station Internal AC Grounding Faults in a Bipolar MMC-HVDC System

Xue, Shimin; Gu, Cheng; Liu, Baibing; Fan, Boyang

doi:10.1109/access.2020.2971516

Cited by 11 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Once a valve-side SPG fault occurs, the converter overcurrent protection will block the faulty converter. The detection of valeside SPG faults has been studied in [21]. The criterion of discriminating a valve-side SPG fault can be expressed as:…”

Section: A Thyristor-pair-and Damping-sm-based Protection Schemementioning

confidence: 99%

See 1 more Smart Citation

Thyristor-Pair- and Damping-Submodule-Based Protection Against Valve-Side Single-Phase-to-Ground Faults in MMC-MTDC Systems

Liu

Zheng

et al. 2022

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

Section: A Thyristor-pair-and Damping-sm-based Protection Schemementioning

confidence: 99%

“…Although the probability of the SPG fault is low, it may bring severe damages to the equipment and system [11]- [21]. In LCC-HVDC systems, the SPG fault on the inverter side may lead to commutation failure [12]- [13].…”

Section: Introductionmentioning

confidence: 99%

Thyristor-Pair- and Damping-Submodule-Based Protection Against Valve-Side Single-Phase-to-Ground Faults in MMC-MTDC Systems

Liu

Zheng

et al. 2022

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

“…For instance, because the level number of the two-level or three-level converter is small, the switching loss is relatively high, and there are difficulties in voltage equalization. For instance, power quality is reduced by the unstable output of renewable energy sources [6][7][8]. In 2001, Rainer Marquard, a German scholar, invented a new topology, and the modular multilevel converter stepped into the field of HVDC power transmission [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fault and Protection Strategy of a Converter Station in MMC-HVDC System

et al. 2022

View full text Add to dashboard Cite

With the development of power energy technology, flexible high voltage direct current (HVDC) systems with high control degree of freedom flexibility, power supply to passive systems, small footprint, and other advantages stand out in the field of long-distance large-capacity transmission engineering. HVDC transmission technology based on a modular multilevel converter has been widely used in power grids due to its advantages such as large transmission capacity, less harmonic content, low switching loss, and wide application field. In the modular multilevel converter (MMC)-based HVDC system, the protection strategy of converter station internal faults is directly related to the reliability and security of the power transmission system. Starting from the MMC topological structure, this paper establishes the MMC mathematical model in a synchronous rotation coordinate system by combining the working state of sub-modules and the relationship between each variable of the upper and lower bridge arms of each phase of the MMC. It provides a theoretical basis for the design of the MMC-HVDC control system. The causes of the AC system faults and the internal faults of the converter station in the MMC-HVDC system are analyzed, and the sub-module faults and bridge arm reactor faults in the converter station are studied. The sub-module redundancy protection and bridge arm overcurrent protection strategies are designed for the faults, and the correctness of the scheme is verified by Matlab/Simulink.

show abstract

“…The AC grounded faults, especially the single-line-toground (SLG) faults are the most common grid fault types in the offshore wind power HVDC system [5], [6]. When AC grounded fault happens, the power delivery capability of the onshore MMC will decrease severely, which will cause surplus power in the DC bus and make the DC-bus voltage increase rapidly [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Low-Voltage Ride Through Strategy for MMC With Y₀/Y₀ Arrangement Transformer Under Single-Line-to-Ground Fault

et al. 2021

View full text Add to dashboard Cite

In the offshore wind farm high-voltage direct-current (HVDC) system, the power delivery capability of the onshore modular multilevel converter (MMC) decreases severely under grid fault, which makes the DC-bus voltage increase rapidly and threatens the safe operation of the system. This paper proposes a low-voltage ride through (LVRT) strategy for MMC with Y0/Y0 arrangement transformer under single-lineto-ground (SLG) fault. The influence of different transformer arrangements to the MMC under SLG fault is analyzed. On this basis, a power delivery capability enhanced method is proposed for MMC with Y0/Y0 arrangement transformer to take advantage of its control ability on zero sequence current. In addition, an optimized LVRT strategy based on resonant controller is proposed, which has simple control structure and can ride through the SLG fault without DC chopper. The offshore wind farm MMC-HVDC simulation system is established in PSCAD/EMTDC and simulation studies are conducted to validate the effectiveness of the proposed LVRT strategy. INDEX TERMSModular multilevel converter (MMC), grid fault, high-voltage direct-current (HVDC), low-voltage ride through (LVRT)

show abstract

Analysis and Protection Scheme of Station Internal AC Grounding Faults in a Bipolar MMC-HVDC System

Cited by 11 publications

References 24 publications

Thyristor-Pair- and Damping-Submodule-Based Protection Against Valve-Side Single-Phase-to-Ground Faults in MMC-MTDC Systems

Thyristor-Pair- and Damping-Submodule-Based Protection Against Valve-Side Single-Phase-to-Ground Faults in MMC-MTDC Systems

Analysis of Fault and Protection Strategy of a Converter Station in MMC-HVDC System

Low-Voltage Ride Through Strategy for MMC With Y₀/Y₀ Arrangement Transformer Under Single-Line-to-Ground Fault

Contact Info

Product

Resources

About