NDLI: Pole-to-ground fault ride through strategy for half-/full-bridge hybrid MMC-based radial multi-terminal HVDC systems with low-impedance grounded

Content Provider	IET Digital Library
Author	Lin, Lei He, Zhen Hu, Jiabing He, Zhiyuan Xu, Kecheng
Abstract	Pole-to-ground (PTG) fault is one of the most common DC-side faults in multi-terminal high-voltage direct-current (HVDC) systems. During the PTG fault, the loss of system transmission power is a challenging issue. This study proposes a PTG fault ride through strategy for low-impedance grounded radial multi-terminal HVDC systems. It is realised by the coordinated operation between half-/full-bridge hybrid modular multilevel converters and mechanical DC switches. The mechanical DC switch is utilised to isolate the fault and a ground return path is formed to transmit the active power during PTG fault. If the fault is located at the sending terminal, half of the rated transmission power can be kept at the entire fault duration. If the fault is located at the receiving terminal, the successfully restarted active power regulator stations can further return to normal operation after the isolation of the PTG fault. With the proposed strategy, the loss of transmission power during PTG fault is minimised, which can improve the transient angle stability of the AC grid. PSCAD/EMTDC simulation is performed to verify the proposed strategy.
Starting Page	1038
Ending Page	1044
Page Count	7
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 4, Feb (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.0580
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-11-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Power Regulator Stations D.C. Transmission EMTDC Fault Duration Fault Location Full-bridge Hybrid MMC-based Radial Multiterminal HVDC System Half-bridge Hybrid MMC-based Radial Multiterminal HVDC System HVDC Power Converter HVDC Power Transmission Loss of System Transmission Power Low-impedance Grounded Radial Multiterminal HVDC System Mechanical DC Switches Modular Multilevel Converter Multiterminal High-voltage Direct-current System Pole-to-ground Fault Ride Through Strategy Power System Protection Power Transmission Fault PSCAD PTG Fault PTG Fault Ride Through Strategy Rated Transmission Power Sending Terminal Transient Angle Stability Voltage-source Converter
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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