Results 31 to 40 of about 16,216,609 (215)

Fluctuation Suppression of DC-Link Voltage Using Control of Converters Connected with DC Distributed Generation

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

A Critical Review of Modular Multilevel Converter Configurations and Submodule Topologies from DC Fault Blocking and Ride-Through Capabilities Viewpoints for HVDC Applications

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, Sahar Pirooz Azad, Mehrdad Kazerani   +2 more
doaj   +1 more source

Low-Voltage Ride Through Strategy for MMC With Y₀/Y₀ Arrangement Transformer Under Single-Line-to-Ground Fault

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, Xu Cai, Qing Chen, Bin Lin, Rui Xie   +4 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, Kenichiro Sano, Yushi Koyama, Kei Sekiguchi, Takahiro Ishiguro, Daichi Suzuki   +5 more
openaire   +1 more source

Improving low voltage ride-through using super capacitor at the DC link of Doubly-Fed Induction Generator based wind turbine [PDF]

, 2015
This paper presents a simple methodology to improve the low voltage ride-through (LVRT) capability of Doubly Fed Induction Generator (DFIG) based wind turbines in order to ride through higher voltage sags and durations.
Ahmed M. A. Haidar, Hagh, Mehrdad T., Kashem M. Muttaqi, Mehrdad T. Hagh, Ahmed Mohamed, Ahmed Haidar, Muttaqi, Kashem M., Haidar, Ahmed M. A.   +6 more
core   +1 more source

An MMC based HVDC system with optimized AC fault ride-through capability and enhanced circulating current suppression control

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, Faheem Akhtar, Dileep Kumar, Hafiz Mudassir Munir, Khawaja Haider Ali, Faisal Alsaif, Sager Alsulamy   +6 more
doaj   +1 more source

DC fault ride‐through of MMCs for HVDC systems: a review

The Journal of Engineering, 2016
As the increasing penetration of modular multilevel converter (MMC)‐based high‐voltage direct current (HVDC) into bulky power transmission systems, the performance of MMC on dealing with DC faults, especially on temporary DC fault in overhead transmission lines, has been becoming more and more significant.
Jiabing Hu, Rong Zeng, Zhiyuan He
openaire   +1 more source

A modular DC transformer with DC fault ride-through capability

Journal of Physics: Conference Series
Abstract DC transformers are core equipment for constructing multi-voltage-level DC distribution networks. However, mainstream DC transformer topologies, which are based on the Input-Series Output-Parallel Dual Active Bridge (ISOP-DAB), currently have deficiencies in fault blocking capability and fault-tolerant redundancy design.
Jiejie Zhou, Yankun Shi, Qianhao Sun, Gu Tai, Peng Qiu, Mingchao Xia   +5 more
openaire   +1 more source

Unidirectional HVdc Topology With DC Fault Ride-Through Capability

Canadian Journal of Electrical and Computer Engineering, 2017
HVdc transmission using modular multilevel converters (MMCs) is becoming increasingly prevalent. However, line-commutated converter (LCC) HVdc transmission remains advantageous in its ability to clear dc faults and restart power transmission without operation of the ac system protection. This paper presents an HVdc system topology that employs both MMC
Steven Howell, Shaahin Filizadeh, Aniruddha M. Gole   +2 more
openaire   +1 more source

A Hybrid HVDC Topology Suitable for Large-Scale Pure Clean Energy Power Base Transmission

Zhongguo dianli, 2023
In order to meet the transmission needs of large-scale pure new energy power bases, after topology comparison, this paper used a hybrid cascaded topology consisting of a line commutated converter (LCC) and a modular multilevel converter (MMC) in the ...
Wenzhe XU, Zheren ZHANG, Zheng XU
doaj   +1 more source