Results 21 to 30 of about 643 (186)
The Journal of Engineering, 2019 To integrate bulk wind power, using modular multilevel converter (MMC) based DC grids is an effective solution to improve the flexibility and reliability of the power grid.
Shuai Cao +4 more
doaj +1 more source
A DC Short-Circuit Fault Ride Through Strategy of MMC-HVDC Based on the Cascaded Star Converter
Energies, 2018 A modular multilevel converter based high voltage direct current (MMC-HVDC) with DC fault self-clearing is adopted to deal with the DC short-circuit fault.
Yingjie Wang +4 more
doaj +1 more source
New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System
Energies, 2021 When integrating multi-grid renewable energy systems, modular multi-level converters (MMCs) are promising for high-voltage DC (HVDC) transmission. Because of the characteristics of the system, however, it is more difficult to prevent a fault at the DC ...
Ui-Jin Kim, Seok-Gyu Oh
doaj +1 more source
Precharging and DC Fault Ride-Through of Hybrid MMC-Based HVDC Systems [PDF]
IEEE Transactions on Power Delivery, 2015 Compared to half-bridge based MMCs, full-bridge based systems have the advantage of blocking dc fault, but at the expense of increased power semiconductors and power losses. In view of the relationships among ac/dc voltages and currents in full-bridge based MMC with the negative voltage state, this paper provides a detailed analysis on the link between
Zeng, Rong +3 more
openaire +3 more sources
Applied Sciences, 2019 In order to solve the problems brought upon by off-shore wind-power plants, it is important to improve fault ride-through capability when an on-shore fault occurs in order to prevent DC overvoltage.
Junghun Lee +3 more
doaj +1 more source
Energies, 2020 Due to the increase in DC load and DC Power generation, the need for DC power system is emerging. Accordingly, FRT (fault ride through) and LVRT (low voltage ride through), which are related regulations for renewable energy sources, have been enacted ...
Sang-Jae Choi, Sung-Hun Lim
doaj +1 more source
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
doaj +1 more source
A DC Fault Ride-Through Control of Half-Bridge MMCs for the HVDC Grid with DC Circuit Breakers
2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia), 2022 Operation delay of DC circuit breakers causes a voltage sag of several milliseconds in high-voltage DC (HVDC) grids. The DC voltage sag can cause an overcurrent in the DC side of the modular multilevel converter (MMC), resulting in halting the MMC. This study investigates a method to facilitate continuous operation of the half-bridge MMC during a DC ...
Atsushi Chiba +5 more
openaire +1 more source
IEEE Access, 2021 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 ...
Xiaohe Wang +4 more
doaj +1 more source
Frontiers in Energy Research, 2023 Modular multilevel converter (MMC) is a proven technology for HVDC applications due to its salient features such as modularity and excellent power quality.
Jahangeer Badar +6 more
doaj +1 more source