DC Fault Current Clearance at the Source Side of HVDC Grid Using Hybrid MMC

Xu, Jianzhong; Zhao, Xibei; Jiang, Hao; Liang, Jun; Zhao, Chengyong

doi:10.1109/tpwrd.2019.2927234

Cited by 58 publications

(20 citation statements)

References 23 publications

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“…9 shows the fault current characteristics of the MMC employing the proposed AFCLC. The blue solid line shows the simulation results and the calculation results shown with a dash-dotted line are obtained by equations (6), ( 13) and (20). As can be seen, the results show a good agreement, which verifies the mathematical analysis presented in the previous sub-section.…”

Section: B Verification Of Effectiveness Of the Proposed Afclcsupporting

confidence: 77%

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An Adaptive Fault Current Limiting Control for MMC and Its Application in DC Grid

Xiang

Zhou

et al. 2021

IEEE Trans. Power Delivery

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This paper proposes an adaptive fault current limiting control (AFCLC) for modular multilevel converters (MMC). Without introducing extra current limiting devices, this control scheme enables fast fault current suppression during DC faults. The AFCLC will be triggered automatically once DC faults occur. By adaptively reducing the output DC voltages of MMCs, the fault current can be suppressed. Compared with the existing current limiting methods, the proposed AFCLC has a better performance on fault current limiting, since it only depends on the real-time operating condition and no fault detection delay is imposed. Firstly, the principle of the proposed AFCLC together with the mathematical analysis is disclosed. Then, the sensitivity analysis of the impact of key control parameters on the current limiting effect is investigated. Finally, the effectiveness of AFCLC is demonstrated in a four-terminal HVDC grid test model. The simulation results show that the proposed AFCLC can reduce the interrupted current and energy absorption of a DCCB from 10.39 kA and 38.24 MJ to 4.62 kA and 8.32 MJ, respectively. The simulation results also prove that the AFCLC will not affect the accuracy of the DC fault detection algorithms under DC faults.

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Section: B Verification Of Effectiveness Of the Proposed Afclcsupporting

confidence: 77%

“…It is also validated in [19] that the full-bridge MMC can actively control the fault current, reducing the interruption energy of DCCB. Reference [20] proposed the methods of controlling the converter current or line current to zero to interrupt the fault current without implementing DCCBs for a four-terminal meshed DC grid.…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Fault Current Limiting Control for MMC and Its Application in DC Grid

Xiang

Zhou

et al. 2021

IEEE Trans. Power Delivery

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“…For an MMC-based MTDC power grid, the dominant component of the short-circuit currents is the discharge currents of SM capacitors. The AC infeed contributions are exclusively present after 10 ms, which can be faithfully ignored [34,43]. It should be noted that the dynamics of MMCs that are based on various SM topologies under DC faults are developed in the same way before blocking, including HB-SM and other SM topologies with DC fault ride through capability [3,7,13].…”

Section: Pole-to-pole Short Circuit Current Calculation Methodsmentioning

confidence: 99%

Review on Short-circuit Current Analysis and Suppression Techniques for MMC-HVDC Transmission Systems

et al. 2020

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The modular multilevel converter (MMC) has been widely adopted in high voltage direct current (HVDC) transmission systems due to its significant advantages. MMC-HVDC is developing towards multi-terminal direct current (MTDC) power grid for reliability enhancement. However, there exist a huge amplitude and a steep rise in fault current due to the low impedances of DC lines and MMCs, which threaten the security and reliability of the DC power grids. It is necessary to restrain the DC short circuit current in order to ensure the safe and stable operation of DC power grids. This paper gives a comprehensive review and evaluation of the proposed DC short-circuit current analysis and suppression techniques used in MMC-based MTDC power girds, in terms of MMC modeling, short circuit calculation, and suppression method. In addition, future trends of countermeasures to short circuit current in MMC-based MTDC power grids are also discussed.

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“…Other hybrid topologies with similar functionality, which combine HB-SMs with FB-SMs or other SM types have also been proposed [22]- [24]. A fault management strategy based on the H-MMC for HVDC grids has been proposed in [25], which explores the capability to control either the converter current or the line current to clear the DC fault with limited power interruption. Despite the fault current limitation capability, the increased investment and operational costs, and the higher conduction losses cannot justify the additional functionalities offered by the FB-MMC and H-MMC.…”

Section: Introductionmentioning

confidence: 99%

DC Fault Management Strategy for Continuous Operation of HVDC Grids Based on Customized Hybrid MMC

Psaras

Vozikis

Adam

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Successful deployment of High-Voltage Direct Current (HVDC) grids necessitates effective DC fault handling strategies, which can minimize the severe consequences caused by DC faults on the AC and DC side of the HVDC grids. Therefore, this paper investigates the enhanced DC fault performance of the Customized Hybrid Modular Multilevel Converter (CH-MMC), in which a limited number of full-bridge sub-modules (FB-SMs) is added into the arms of the conventional MMC in an effort to significantly extend the timespan between fault inception and fault clearance, thus allowing the use of relatively slow and cheaper DC circuit breakers. Based on this converter, a dedicated DC fault handling strategy for CH-MMC based HVDC grids is proposed, which aims to improve the fault resiliency and security of HVDC grids for pole-to-pole faults. Moreover, the proposed DC fault management strategy guarantees the continuous operation of the grid during pole-to-ground DC faults, including full reactive power provision from the converter stations. The performance of the strategy is demonstrated using comprehensive electromagnetic transient (EMT) simulation studies conducted on an illustrative four-terminal meshed HVDC grid, which consider a range of scenarios with different fault current limiting inductors and DC circuit breaker operation times.

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DC Fault Current Clearance at the Source Side of HVDC Grid Using Hybrid MMC

Cited by 58 publications

References 23 publications

An Adaptive Fault Current Limiting Control for MMC and Its Application in DC Grid

An Adaptive Fault Current Limiting Control for MMC and Its Application in DC Grid

Review on Short-circuit Current Analysis and Suppression Techniques for MMC-HVDC Transmission Systems

DC Fault Management Strategy for Continuous Operation of HVDC Grids Based on Customized Hybrid MMC

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