Adaptive Single-Pole Autoreclosing Concept with Advanced DC Fault Current Control for Full-Bridge MMC VSC Systems

Stumpe, Maximilian; Ruffing, Philipp; Wagner, Patrick; Schnettler, Armin

doi:10.1109/tpwrd.2017.2706361

Cited by 34 publications

(19 citation statements)

References 25 publications

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“…Generally, the modular multilevel converter (MMC) can be realized using unipolar cells (such as the half-bridge (HB) cell), symmetrical bipolar cells (such as the full-bridge (FB) cell) and asymmetrical bipolar cells (such as the hybrid cell, which is equivalent to series connection of HB and FB cells) [1]. In these categories of the MMC, the cell type determines the MMC characteristics such as control range, resiliency to dc faults and semiconductor losses [2], [3]. Between the two established implementations, the MMCs with large number of cells per arm, where the switching devices and capacitor of each cell block sized for relatively low voltage of 1.5kV-2.8kV [4] have been exhaustively researched and adopted in many projects offered from different manufacturers of HVdc systems.…”

Section: Introduction Present Generations Of Multilevel Voltage Somentioning

confidence: 99%

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Vozikis

Adam

Rault³

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper describes the operating principles and theoretical relationships that underpin the modelling and control system of the enhanced modular multilevel converter (EMMC). A full-scale model of a point-to-point HVdc link that employs EMMCs is used to examine its performance during normal operation in all four quadrants, and resiliency to symmetrical and asymmetrical ac and dc faults. Results of exhaustive simulation studies reveal that the improved ac and dc power qualities, which are achieved by incorporation of a few full-bridge cells into the arms of conventional half-bridge modular multilevel converter (HB-MMC) with medium-voltage cells to create the EMMC do not affect its ac and dc fault ride-through capability nor its dynamics during normal operation as active and reactive power set-points being varied. In addition, a variant of the EMMC is proposed, in which the number of full-bridge cells to be added into the arms of HB-MMC could be increased to offer bespoke features beyond that explicitly defined in original vision of the EMMC, such as reduced dc voltage operation during pole-toground dc fault, and potential extension of fault clearance times in multi-terminal HVdc grids. Moreover, the validity of the new variant has been confirmed using results obtained from highfidelity HVdc link models developed in EMPT-RV platform, in which the EMMCs are replaced by the proposed variant.

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Section: Introduction Present Generations Of Multilevel Voltage Somentioning

confidence: 99%

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Vozikis

Adam

Rault³

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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“…But this method still brings about large dissipation requirement of DCCBs, which will reduce the life time of DCCBs. Reference [18] proposes an adaptive reclosing strategy for full-bridge MMC-HVDC system. The nonlinear interdependence between the fault resistance and the current is used to detect nonpermanent faults.…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Reclosing Strategy for MMC-HVDC Systems With Hybrid DC Circuit Breakers

Yang

Xiang

Zuo

et al. 2020

IEEE Trans. Power Delivery

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Modular multilevel converter (MMC) based high voltage direct current transmission (HVDC) is an effective solution for large-scale renewable power integration over long-distance. In the overhead MMC-HVDC systems, the high voltage DC circuit breakers (DCCB) are implemented to interrupt the DC fault current. Subsequent to fault isolation, the DCCBs are required to automatically re-close to restore power transmission quickly. However, when the DCCBs are re-closed to permanent faults, they will be tripped again, resulting in a high requirement of interruption capacity for DCCBs and second overcurrent strikes on the HVDC systems. To overcome the drawbacks of the conventional auto-reclosing scheme, this paper proposes an adaptive reclosing scheme based on the active pulse injection from the converter associated with the coordination control of hybrid DCCBs. The single-end adaptive reclosing scheme as well as the two ends adaptive reclosing scheme dedicated to two-terminal HVDC systems and meshed DC grids are presented respectively. By applying this method, the location of faults can also be achieved in the case of permanent faults. In order to verify the effectiveness of the proposed adaptive reclosing schemes, extensive simulations have been conducted under PSCAD/EMTDC.

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“…When a short-circuit fault occurs on the DC line, very large fault currents will be caused in the DC lines and converters [6]. Since temporary faults often occur on overhead lines, MMC-HVDC needs reclosing to improve the reliability and continuity of the power supply [7]. Consequently, the vulnerable power electronic elements in the converter will be exposed to overcurrent again when the system attempts to reclose a permanent fault.…”

Section: Introductionmentioning

confidence: 99%

A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

Jiang

Gong

2019

Applied Sciences

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A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent problem. In this paper, a new fault current limiter (FCL) based on reclosing current limiting resistance (RCLR) is proposed to solve the overcurrent problem during the reclosing process. Firstly, a mesh current method (MCM) based short-circuit current calculation method is newly proposed to solve the fault current calculation of a loop MMC-HVDC grid. Then the method to calculate the RCLR is proposed based on the arm current to limit the arm currents to a specified value during the reclosing process. Finally, a three-terminal loop MMC-HVDC test grid is constructed in the widely used electromagnetic transient simulation software PSCAD/EMTDC and the simulations prove the effectiveness of the proposed strategy.

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Adaptive Single-Pole Autoreclosing Concept with Advanced DC Fault Current Control for Full-Bridge MMC VSC Systems

Cited by 34 publications

References 25 publications

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

An Adaptive Reclosing Strategy for MMC-HVDC Systems With Hybrid DC Circuit Breakers

A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

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