Results 61 to 70 of about 45,889 (185)
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 +6 more
wiley +1 more source
Research on Voltage Regulation Methods for Flexible On‐Load Tap‐Changing Transformers
Electrical Materials and Applications, Volume 3, Issue 1, January/December 2026.The control system determines whether the output voltage magnitude of the voltage source converter (VSC) is high, low or constant and generates the corresponding pulse signals. Each pulse is generated at the valve‐triggering instant, with its width corresponding to the commutation angle.
Weimei Zhao, Qiao Guangyao
wiley +1 more source
Parallel Tapping LCC-HVDC Systems with Multiple Modular Multilevel Converters [PDF]
, 2019 The idea of tapping is to extract a small amount of power from existing high voltage direct current (HVDC) transmission lines to minimize the infrastructure cost in electrifying rural communities. The vast majority of the previous research has focused on
Liu, Dalu
core +1 more source
IET Energy Systems Integration, Volume 8, Issue 1, January/December 2026.ABSTRACT Renewable energy bases in Desert‐Gobi‐Wasteland (DGW) areas connected with high‐voltage direct current (HVDC) transmission systems show notable weak‐grid features, including low inertia, weak damping and a low short‐circuit ratio. This results in strong active power–voltage (P–V) coupling effects, making existing real‐time active power control
Guoqing Li +4 more
wiley +1 more source
Simulation of LCC-MMC HVDC Systems Using Dynamic Phasors
IEEE Access, 2021 This paper proposes a large-signal dynamic phasor (DP) model for the main circuit of the new emerging LCC-MMC HVDC hybrid system. The model is concise and compact, and provides convenient interfaces with the control systems and external electrical ...
Xiaoming Mao +3 more
doaj +1 more source
IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.1) The typical operational risks and coupling characteristics of the AC/DC hybrid power grid are analyzed in detail. 2) A bi‐Level topology optimization method is designed for HVDC systems embedded in dense AC grids. 3) Considering engineering standards of both security and economy, multi‐dimensional security and stability constraints are incorporated ...
Mingxin Yan +5 more
wiley +1 more source
IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.The study presents a shapelet‐based method for short‐term voltage stability assessment in multi‐infeed HVDC systems, directly addressing the challenges of high‐dimensional, nonlinear and time‐varying phenomena intrinsic to modern power grids. By integrating a multi‐timescale interaction mechanism with an interpretable time‐series data mining approach ...
Yubo Sun, Shuqing Zhang, Chao Lu
wiley +1 more source
Research on Fault Ride‐Through Characteristics of Inverter‐Side Hybrid HVDC in Offshore Wind Farms
IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.This paper addresses issues in wind power DC transmission systems, such as difficulty in maintaining power delivery during rectifier‐side faults and frequent overvoltage occurrences during inverter‐side faults. A hybrid topology comprising a rectifier‐side MMC and an inverter‐side LCC‐MMC configuration is proposed, along with corresponding enhanced ...
Guoqing Yang, Jiaying He, Jiaying Xu
wiley +1 more source
IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.This paper first identifies the common issue across multiple LCC‐HVDC control systems, namely, that uncertain and uncoordinated control strategies switching would lead to subsequent commutation failure. Then, since power reflects variations in electrical quantities such as voltage and current, the analysis is conducted from a transmitted‐power ...
Xiaohua Li +4 more
wiley +1 more source
Startup Method and Strategy for Bipolar LCC-HVDC System Used as Black-Start Power Source
Zhongguo dianliThe scientific and reasonable black-start scheme is the most effective measure to cope with the power grid blackout, which can greatly accelerate the system recovery process, thus significantly reducing the losses of power system due to power failure ...
Qingwei WANG +3 more
doaj +1 more source