Results 31 to 40 of about 1,070 (185)

Research on Equivalent Circuit Model of HVDC Valve and Calculation of Thyristor Junction Temperature

Active and Passive Electronic Components
For the difference of thyristor junction temperature at all levels in the transducer valve assembly in the series water circuit, an equivalent model of thyristor junction temperature calculation for the valve assembly is established, and PLECS simulation
Wei Yao, Yang Liu, Lei Guo, Guojun Ding, Chaofeng Zhang, Sen Wang   +5 more
doaj   +1 more source

Real-Time Monitoring Method for Thyristor Losses in Ultra High Voltage Converter Station Based on Wavelet Optimized GA-BP Neural Network

IEEE Access, 2023
As the core equipment for AC/DC conversion in ultra-high voltage direct current (UHVDC) transmission systems, thyristor converter valves are the main source of losses in converter stations.
Jicheng Yu, Siyuan Liang, Yinglong Diao, Changxi Yue, Xiaodong Yin, Feng Zhou, Youhui Qiu, Jiangchao Qin   +7 more
doaj   +1 more source

High Voltage DC Active Current Injection to Simulate Geomagnetically Induced Currents in New Zealand

Space Weather, Volume 24, Issue 3, March 2026.
Abstract This study investigates the effects of geomagnetically induced currents (GIC) on New Zealand's electrical infrastructure via an intentional ground injection of direct current (DC) from a high voltage DC converter station. GIC manifests as quasi‐DC currents within power systems, potentially causing transformer saturation, increased reactive ...
Soren Subritzky, Andrew Lapthorn, Stewart Hardie, Paul Agger, Mike Dalzell, Mark A. Clilverd, Neil Cobbett, Ciaran Beggan, Juliane Hübert, Eliot Eaton, James B. Brundell, Craig J. Rodger   +11 more
wiley   +1 more source

A Hybrid Ultra‐High Voltage DC Transformer With Digital Twin‐Driven Operation and Control

Digital Twins and Applications, Volume 3, Issue 1, January/December 2026.
This study introduces a digital twin‐driven hybrid ultra‐high‐voltage DC transformer (UHVDCT) that combines high‐capacity LCCs with low‐capacity MMCs at the UHV side. This innovative topology reduces MMC requirements by 32.9% while ensuring stable power flow and dynamic reactive balance through real‐time virtual‐physical synchronization.
Ling Xu, Le Zhao, Xiaohu Zhang, Hanlin Guo, Jie Fang, Zheren Zhang, Zheng Xu   +6 more
wiley   +1 more source

Diagnostics of the thyristor bridge fault based on the detection of the line-frequency second harmonic in the output current of an AC/DC converter [PDF]

Tehnika, 2018
In this paper was presented the technical procedure implemented for the fault diagnostics of the thyristor bridge in an AS/DC converter. During the development of the new generation of digital controllers for AC/DC converters, it was required for these ...
Vukić Vladimir Đ., Prole Rajko Đ.
doaj  

Ferromagnetically Shielded Fault Current Limiter (FS‐FCL) Evaluation in Power Line

IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.
This study introduces a new ferromagnetically shielded FS‐FCL design and its control strategy for limiting and interrupting fault currents. The fully shielded core structure enhances inductance and prevents saturation, enabling an immediate fault response without causing voltage drop during normal conditions.
Kamran Ghorbanyan, Selim Acar
wiley   +1 more source

Multi‐Layer MTDC Protection: Design and Simulation Assessment

IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.
This study proposes a novel multi‐layer protection architecture for multi‐terminal DC systems that separates fault current‐limiting and interruption functions. By combining a thyristor‐based fault current limiter with an active resonance circuit breaker, the scheme significantly reduces peak fault currents and di/dt stress, enabling a more compact ...
Jong‐Geon Lee, Il Kwon, YuJin Kwahk, Bang‐Wook Lee   +3 more
wiley   +1 more source

Fast-Read Storage Performance by Thyristor Operation in 3-D Flash Memory

IEEE Journal of the Electron Devices Society
In this work, we report the fast-read storage performance of thyristor operation in 3D flash memory. By forming a pseudo N+/P/N/P+ structure with the word line (WL) bias of 3D string cells, thyristor operation with steep switching characteristics and a ...
Tomoya Sanuki, Hideto Horii, Takashi Maeda   +2 more
doaj   +1 more source

Thyristor State Evaluation Method Based on Kernel Principal Component Analysis

IEEE Access, 2022
The reliability of the thyristor is directly related to the safe operation of the DC transmission system. A method for evaluating the state of thyristors based on kernel principal component analysis (KPCA) is proposed, which firstly considers the ...
Zhaoyu Lei, Jianyi Guo, Feng Zheng, Jiayang Li, Lei Wang, Liangshou Hao, Youping Fan   +6 more
doaj   +1 more source

Value‐Based Reinforcement Learning for Inter‐Area Oscillations Mitigation in PV‐Integrated Power Systems

IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.
Enhanced critic‐only DQN with smoothing enables continuous SVC control for damping inter‐area oscillations. The state selection via participation and residue analysis captures critical key modes. Orthogonal array efficiently tunes hyperparameters with low cost.
Gunawan Dewantoro, Faizal Hafiz, Akshya Swain, Nitish Patel   +3 more
wiley   +1 more source