Results 91 to 100 of about 1,668 (205)

Operation analysis of thyristor based front-to-front active-forced-commutated bridge DC transformer in LCC and VSC hybrid HVDC networks [PDF]

, 2017
The active-forced-commutated (AFC) bridge employs a symmetrical thyristor-bridge with auxiliary self-commutated full-bridge chain-link (FB-CL) circuit to assist its soft transition and forced commutation.
Adam, Grain P., Finney, Stephen J., Holliday, Derrick, Li, Peng   +3 more
core   +2 more sources

Design of cooling structure improvement of hybrid commutated converter valve

High Voltage, Volume 10, Issue 3, Page 570-580, June 2025.
Abstract This paper presents a thermal management framework for 120 kV hybrid commutated converter (HCC) valves, addressing critical cooling challenges in multi‐hundred‐MW power conversion systems. Power loss calculations under rated (1.0 p.u.) and overload (1.2 p.u.) conditions demonstrate that HCC valves achieve comparable loss levels to line ...
Xu He, Lu Qu, Xiaoguang Wei, Fang Cai, Zhanqing Yu, Tianhui Yang, Yurong Luo, Gongyi Zhang   +7 more
wiley   +1 more source

Distributed Secondary Frequency Control through MTDC Transmission Systems

, 2015
In this paper, we present distributed controllers for sharing primary and secondary frequency control reserves for asynchronous AC transmission systems, which are connected through a multi-terminal HVDC grid.
Andersson, Göran, Andreasson, Martin, Dimarogonas, Dimos V., Johansson, Karl H., Wiget, Roger   +4 more
core   +2 more sources

Thyristor based modular multilevel converter with active full-bridge chain-link for forced commutation [PDF]

, 2016
Voltage source converter (VSC) such as modular multilevel converter (MMC) has been intensively studied for high voltage direct current (HVDC) applications due to its flexible terminal voltage adjustment, compatibility with weak ac grid and independent ...
Finney, Stephen, Holliday, Derrick, Li, Peng   +2 more
core   +1 more source

Closed‐loop input current control strategy based on waveform similarity index for the emerging matrix converters with harmonic injection technique

IET Electric Power Applications, Volume 19, Issue 1, January/December 2025.
This paper introduces the waveform similarity index (WSI), which is an effective index to characterise the input current performance of harmonic injection matrix converter (HIMC). A closed‐loop control strategy is proposed to regulate the WSI difference through multi resonant controllers (RCs), which can fully suppress the effect of inaccurate harmonic
Zhichao Yang, Jiaxing Lei, Bingtuan Gao, Wu Chen   +3 more
wiley   +1 more source

A Hierarchical Control Strategy With Fault Ride-Through Capability for Variable Frequency Transformer [PDF]

, 2014
A variable frequency transformer (VFT) is being considered as a new alternative to the classical back-to-back high voltage direct current (HVDC) link for interconnection of two asynchronous networks. The VFT is a retrospective form of frequency converter
Ambati, Bharath Babu, El Moursi, Mohamed, Kanjiya, Parag, Khadkikar, Vinod, Kirtley Jr, James L   +4 more
core   +1 more source

Impact of cellulose degradation on space charge dynamics and dielectric properties of Kraft paper impregnated with ester liquid in comparison with mineral oil

Electrical Materials and Applications, Volume 2, Issue 1, January/December 2025.
The change in conductivity with paper‐ageing could be linked with the change in total amount of charges as well as the electric field distortion. Moreover, the electric field distortion was consistent in ester liquid‐impregnated papers with paper‐ageing while it increased noticeably in mineral oil‐impregnated papers at stage II of ageing.
Abdelrahman M. Alshehawy, Shanika Matharage, Zhongdong Wang   +2 more
wiley   +1 more source

Enhanced constant extinction angle control for subsequent commutation failure in LCC‐HVDC

IET Generation, Transmission &Distribution, Volume 19, Issue 1, January/December 2025.
The key control factor affecting subsequent commutation failure suppression in line‐commutated converter‐based high‐voltage direct current were identified. Some conclusions from previous literature were corrected, and an adaptive integral parameter adjustment strategy to enhanced control ability and suppress subsequent commutation failure was ...
Hao Li, Xiaohua Li, Benjun Ge, Xiaoyu Sun   +3 more
wiley   +1 more source

Solution to reduce voltage stress of sub-module in LCC–MMC transmission system at the condition of communication fault

The Journal of Engineering, 2018
Line commutate converter–modular multilevel converter (LCC–MMC) hybrid high voltage direct current (HVDC) system combines the advantages of both LCC-HVDC and MMC-HVDC, and will be wildly used in the future.
Dengjiang Xing, Jianjun Su, Dingwen Hu, Shumin Sun, Yan Chen, Xianwei Wang, Jun Zhang, Weizheng Yao, Jinlong Wu   +8 more
doaj   +1 more source

Power reduction coordinated scheme for wind power plants connected with VSC-HVDC [PDF]

, 2017
This article introduces a novel power coordination method for the operation under restricted conditions of offshore wind power plants connected with VSC-HVDC without the use of communications between converter stations.
Aragüés-Peñalba, Mónica, Egea-Àlvarez, Agustí, Gomis-Bellmunt, Oriol, Prieto-Araujo, Eduardo   +3 more
core   +3 more sources