Results 21 to 30 of about 8,400 (267)
Energies, 2022 Modular multilevel converters (MMCs) based on half-bridge submodules (HBSMs) are unable to prevent the AC side contribution to DC side fault currents, thus necessitating circuit breakers (CBs) for protection.
Munif Nazmus Sakib +2 more
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Fault Detection and Fault Tolerance Mechanism for DC/DC Converters in Microgrids
IFAC-PapersOnLine, 2018 Abstract A solution for modelling and controlling the operation of DC/DC converters, both in normal and in fault regime, is proposed. The proposed converter model is based on ARX structure with variable coefficients. Feedforward fully connected neural network are used in order to generate the appropriate model coefficients for variable duty cycle.
Vlad Muresan +5 more
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Research on fast solid state DC breaker based on a natural current zero-crossing point
Journal of Modern Power Systems and Clean Energy, 2014 The DC fault characteristics of voltage source converter based high voltage direct current (VSC-HVDC) systems are analyzed in this paper. The phenomenon whereby the capacitor on DC side discharges quickly during a DC fault contributes to a large short ...
Wang Xiang +4 more
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DC fault detection technology for AC/DC distribution network based on DBN
电力工程技术, 2023 With the development of multi-source AC/DC distribution networks, DC fault detection technology has become the key to DC protection. Aiming at the characteristics of large fault current with a rapid rise and difficulty to extract fault features when ...
WANG Yang +5 more
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DC Fault Parameter Sensitivity Analysis [PDF]
12th IET International Conference on Developments in Power System Protection (DPSP 2014), 2014 At present High Voltage Direct Current (HVDC) Voltage Source Converters (VSC) are susceptible dc faults leading to extreme currents. The fault current cannot be controlled by the converter switching flows in the anti-parallel diodes. Protection devices are, therefore, required to operate with sufficient speed to avoid device failure.
Page, Frederick +4 more
openaire +3 more sources
Energies, 2018 The rapid detection of direct current (DC) faults is one of the key technologies for the development of multi-terminal alternating current (AC)/DC hybrid distribution networks. The DC fault current rises quickly and affects the whole network.
Xiaomin Qi, Wei Pei, Luyang Li, Li Kong
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Fault Section Estimation in Radial LVDC Distribution System Using Wavelet Transform
Energies, 2021 The demand for low voltage DC (LVDC) distribution systems is increasing due to the rapid development of power conversion technology, the increase of DC-based digital loads, and the expansion of DC-based distributed generation (DG).
Hun-Chul Seo +2 more
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IET Generation, Transmission & Distribution, 2021 Voltage source converter‐based DC systems face severe overcurrent problem under DC line faults, which causes significant influence on security, reliability and stability of the power system. As the theoretical basis for relay coordination and protection,
Zhengguang Xiao +6 more
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Extensive analysis of fault response and extracting fault features for DC microgrids
Alexandria Engineering Journal, 2021 This paper presents an extensive fault analysis for DC microgrids based on accurate representation of DC microgrid components. The DC microgrid incorporates photovoltaic system and wind energy system as renewable energy sources, batteries as energy ...
Eatmad W. Nahas +3 more
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Combined control strategy of half-bridge MMC DC side fault current limiting
电力工程技术, 2023 The flexible direct current (DC) grid based on modular multilevel converter (MMC) has a high current peak value and a very fast rising speed during a DC short-circuit fault. In order to limit the impact of fault current on the system in a short period of
WEI Xingjie +3 more
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