Results 21 to 30 of about 1,954,001 (140)

Impact of synchronous condenser on the dynamic behavior of LCC-based UHVDC system hierarchically connected to AC system

CSEE Journal of Power and Energy Systems, 2019
Hierarchical connection (HC) is a very attractive mode for ± 800 kV line commutated converter based ultra high voltage direct current (LCC-UHVDC) system connected to different AC voltage levels because of its ability to reduce the scale factor of a ...
Ali Aamir, Li Qiao, Chunyi Guo, Atiq Ur Rehman, Zhizhong Yang   +4 more
doaj   +1 more source

A controllable thyristor-based commutation failure inhibitor for LCC-HVDC transmission systems [PDF]

, 2021
Commutation failure is a serious malfunction in line-commutated high voltage direct current (HVdc) converters which is mainly caused by the inverter ac faults, and results in a temporary interruption of transmitted power and damage to the converter ...
Mat Said, Dalila, He, Jinghan, Tzelepis, Dimitrios, Booth, Campbell, Mirsaeidi, Sohrab, Dong, Xinzhou   +5 more
core   +3 more sources

A Continuous Fault Ride-through Scheme for DFIGs Under Commutation Failures in LCC-HVDC Transmission Systems

Journal of Modern Power Systems and Clean Energy, 2023
Experimental and theoretical studies have confirmed that, relative to a one-shot voltage fault, a doubly-fed induction generator (DFIG) will suffer a greater transient impact during continuous voltage faults.
Zixuan Zheng, Donghui Song, Kaijian Du, Xianyong Xiao, Jie Ren, Qi Xie   +5 more
doaj   +1 more source

A DC Chopper Topology to Mitigate Commutation Failure of Line Commutated Converter Based High Voltage Direct Current Transmission

Journal of Modern Power Systems and Clean Energy, 2020
To reduce the probability of commutation failure (CF) of a line commutated converter based high-voltage direct current (LCC-HVDC) transmission, a DC chopper topology composed of power consumption sub-modules based on thyristor full-bridge module (TFB ...
Chunyi Guo, Bo Liu, Chengyong Zhao
doaj   +1 more source

An Adaptive Phase Locked Oscillator to Improve the Performance of Fault Recovery from Commutation Failure in LCC-Based HVDC Systems

Energies, 2023
An adaptive control of phase lock oscillator (PLO) is proposed to increase the ability of LCC-based HVDC systems to successfully recover from commutation failure, where the dynamic performance during the recovery process is improved.
Hongda Cai, Jing Li, Yongzhi Zhou, Yishuang Hu   +3 more
doaj   +1 more source

Commutation Failure Prediction for Multi-Infeed LCC-HVDC Systems Under Asymmetrical Faults

, 2023
Commutation failure (CF) occurs frequently under inverter AC system faults. Around 70% of power system faults are Single-Line-to-Ground (SLG) faults that affect not only magnitudes but also phase angles of non-faulty phases.
Chunyan Cui, Zhang, Xiao-Ping; id_orcid, Nan Chen, Chen, Nan; id_orcid, Li, Lanfang, Xue, Ying; id_orcid, Ying Xue, Cui, Chunyan, Xiao-Ping Zhang, Yuefeng Yang, Yang, Yuefeng, Lanfang Li   +11 more
core   +1 more source

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

IEEE Access, 2020
This article presents a control strategy for a modular multilevel converter (MMC) to prevent commutation failure of a line-commutated converter (LCC), forming a three-terminal hybrid HVDC transmission system, where one LCC sending end is connected to the
Choongman Lee, Jae Woong Shim, Heejin Kim, Kyeon Hur   +3 more
doaj   +1 more source

Calculation Method for Commutation Failure Fault Level in LCC-HVDC System Under Single-Line-to-Ground Faults Considering DC Current Variation

Journal of Modern Power Systems and Clean Energy, 2023
Earlier studies have reported some calculation methods for commutation failure fault level (CFFL) in line-commutated-converter based high-voltage direct current (LCC-HVDC) system under single-line-to-ground (SLG) faults.
Renlong Zhu, Xiaoping Zhou, Hanhang Yin, Lerong Hong, An Luo, Yandong Chen, Hanting Peng   +6 more
doaj   +1 more source

AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

Energies, 2020
With the rapid development of ultra-high-voltage (UHV) AC/DC, especially the step-by-step upgrading of the UHV DC transmission scale, security presents new challenges.
Li Sun, Hongbo Liu, Chenglian Ma
doaj   +1 more source

Procedure analysis of UHVDC commutation failure

, 2019
There may be a commutation failure during a fault or start-up of the UHVDC inverter side. The law of commutation failure process in UHVDC converter is studied here. First, the cause of inverter commutation failures is briefly introduced.
Chi Zhang, Peng Li, Xiangping Kong, Yubo Yuan, Chenqing Wang   +4 more
core   +1 more source