Results 91 to 100 of about 1,639 (185)

A novel method of restoration path optimization for the AC-DC bulk power grid after a major blackout

, 2023
The restoration control of the modern alternating current-direct current (AC-DC) hybrid power grid after a major blackout is difficult and complex. Taking into account the interaction between the line-commutated converter high-voltage direct current (LCC-
Cheng, Tianle, Li, Shaoyan, Li, Yang, Liang, Gaoshen, Yang, Chao   +4 more
core   +1 more source

Collaborative Optimisation of Frequency Regulation Capability and Power Schedule for HVDC Interconnected Asynchronous Systems

IET Generation, Transmission &Distribution, Volume 19, Issue 1, January/December 2025.
A collaborative optimisation model is proposed to optimise the primary frequency regulation capabilities of flexible resources and power scheduling plans of various units. The proposed model can improve the operational flexibility of HVDC interconnected asynchronous power grids and achieve the optimal allocation of intra‐area frequency regulation ...
Yukang Shen, Wenchuan Wu, Chenhui Lin, Bin Wang, Run Huang, Yixuan Chen, Qiang Yu   +6 more
wiley   +1 more source

A low‐cost MMC submodule topology with fast DC fault handling capability

IET Power Electronics, Volume 18, Issue 1, January/December 2025.
This paper proposes a modular multilevel converter (MMC) sub‐module structure with low switching loss and fast blocking function of DC bipolar short‐circuit fault current. The proposed structure is able to output levels of three voltage levels. Compared with the traditional MMC composed of full‐bridge submodule, its fault current blocking speed is ...
Yiqi Liu, Laicheng Yin, Zhaoyu Duan, Zhenjie Li, Mingfei Ban, Jiawei Zhang   +5 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

Hybrid IGBT/IGCT‐Based DC‐Hub for Interconnection of VSC/LCC Future DC Networks

IET Power Electronics, Volume 18, Issue 1, January/December 2025.
ABSTRACT The interest in interconnecting multiple DC grids‐ medium‐voltage direct current/high‐voltage direct current (MVDC/HVDC)‐ across the globe has grown significantly in recent years. This interest is primarily driven by the benefits of increased reliability and cost efficiency in power transmission systems, particularly with the growing ...
Mohamed Mansour, Yousef N. Abdelaziz, Ahmed A. Aboushady, Fahad Alsokhiry, Khaled H. Ahmed, Ayman S. Abdel‐khalik, Ahmed Abdulwhab   +6 more
wiley   +1 more source

The Series Bridge Converter (SBC): design of a compact modular multilevel converter for grid applications [PDF]

, 2016
This paper presents a novel hybrid modular multilevel voltage source converter suitable for grid applications. The proposed converter retains the advantages of other modular multilevel topologies and can be made more compact making it attractive for ...
Amankwah, Emmanuel K., Chivite-Zabalza, Javier, Clare, Jon C., Costabeber, Alessando, Jasim, Omar, Trainer, David, Watson, Alan James   +6 more
core   +1 more source

Dynamic reactive power reserve assessment method for hybrid AC/DC networks based on a reduced equivalent model of an LCC‐HVDC converter process

IET Renewable Power Generation, Volume 19, Issue 1, January/December 2025.
This paper proposes a reduced equivalent model of the dynamic process of an inverter converter, which approximates the accurate reactive power voltage dynamic process of the converter's electromagnetic transient time scale into the core reactive power dynamic process of the electromechanical transient time scale. Based on this reduced equivalent model,
Sidun Fang, Yuli Lei, Tao Niu, Guanhong Chen, Lin Xue, Wenguo Wu, Nan Feng, Yuyao Feng   +7 more
wiley   +1 more source

Stability analysis of large wind farms connected to weak AC networks incorporating PLL dynamics [PDF]

, 2015
Voltage source converter interfaced wind turbines connected to weak grids can induce system instability. A state space model is used in this paper to study the stability of large wind farms.
Givaki, Kamyab, Xu, Lie
core   +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

Research on a new scheme of LCC‐HVDC line protection

The Journal of Engineering, 2017
High‐performance protection scheme of the transmission line is very important for the safe and reliable operation of line commutated converter‐based high‐voltage direct current (HVDC) system. The transmission line protection scheme applied in existing projects is lack of reliability, rapidity and incomplete in theory.
Guobing Song, Yaobin Gu, X.H. Huang, Ting Wang, W. Huang   +4 more
openaire   +1 more source