Results 71 to 80 of about 4,243 (258)

Research on Overcurrent in Offshore MMC and Suppression Strategies Based on Field–Circuit Coupling Analysis

Applied Sciences
Due to system failures and the limited overcurrent capability of semiconductor devices, overcurrent in modular multilevel converters (MMC) is a key factor affecting the safe and stable operation of offshore wind power MMC-HVDC (modular multilevel ...
Jun Zhang, Shuhong Wang, Youpeng Huangfu, Ruting Tang   +3 more
doaj   +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

Transient Fluctuation Suppression Strategy for MMC Flexible DC Systems Based on Gain-Varying Extended Disturbance Observer

IEEE Access
Modular Multilevel Converter Based High Voltage Direct Current (MMC-HVDC) system is an important technical means to realize grid connection and transmission of new energy.
Huanruo Qi, Yilong Kang, Xiaojv Lv, Ziwen Liu, Xiangyang Yan, Fang Guo   +5 more
doaj   +1 more source

Study on characteristics and impacting factors of oscillation of wind farms integration via an MMC-based HVDC system

The Journal of Engineering, 2018
Modular multilevel converter (MMC)-based high-voltage DC (HVDC) transmission technology has become an ideal solution for large and remote wind farms integration.
Xiao Wang, Xiaobao Hu, Hui Liu, Haibo Lan, Siqing Sheng, Linlin Wu   +5 more
doaj   +1 more source

Deadbeat-based control for MMC-HVDC power systems

International Journal of Electrical Power & Energy Systems
With the domination of modular multilevel converters (MMCs) interfaced power grids, especially for transmission of the wind generated energy, the control of such power electronic interfaced grids is of an utmost important for the proper operation and grid stability.
Majstorović, Milovan, NOUGAIN, VAIBHAV, Ristic, Leposava, Lekic, Aleksandra   +3 more
openaire   +3 more sources

Parametric Sensitivity Analysis of a Multi‐Gigawatt Offshore Multi‐Energy System Using Reduced‐Order Models

IET Energy Systems Integration, Volume 8, Issue 1, January/December 2026.
ABSTRACT When multiple grid‐forming and grid‐following converters operate within an offshore energy system (OES), dynamic interactions among them can lead to poorly damped oscillations and potential instability. This paper proposes a computationally efficient reduced‐order state‐space modelling framework for small‐signal stability and parametric ...
Nakul Narayanan K, Chunjun Huang, Maria Camila Castrillon Franco, Jose Luis Rueda Torres   +3 more
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

Stability and Synchronization of MMC‐HVDC Systems Using SRF and Inertia‐Based PLLs

IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.
This study investigates the influence of synchronous reference frame PLL (SRF‐PLL) and the inertia PLL (IPLL) on the stability of grid‐connected modular multilevel converter high voltage direct current (MMC‐HVDC) systems. The findings highlight intrinsic stability limitations of PLL‐based systems, offering insights toward more stable, PLL‐less ...
Shuai Wang, Robin Preece, Mike Barnes
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

A Novel MMC‐HVDC Transmission Line Protection Method Based on Energy Criterion and GADF‐MA‐CNN

IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.
1. Identifies faulty sections using the energy criterion. 2. Uses GADF to acquire fault voltage characteristics. Utilises the MA‐CNN model for rapid fault type identification. 3. It has high accuracy, strong anti‐noise ability and can withstand 500? fault resistance.
Xiangyang Liu, Zhong Tang, Hong Qian, Haoyang Cui   +3 more
wiley   +1 more source