Results 11 to 20 of about 246 (86)

A novel low-voltage current-limiting control strategy with improved voltage compensation

Energy Reports, 2023
By optimizing the design of the conventional low-voltage current limiting controller (VDCOL), the continuous commutation failure on the receiving end of the traditional LCC-HVDC transmission system is effectively suppressed.
Haitao Wu, Yunbin Li, Zhihe Wang
doaj   +2 more sources

Adaptive Current Deviation Control and Improved VDCOL for Enhanced Fault Ride‐Through in CLCC‐HVDC Systems

IET Generation, Transmission & Distribution
ABSTRACT The appealing capability of long‐distance and large‐capacity power transmission makes High‐Voltage Direct Current (HVDC) transmission technology become an energy corridor of power systems. The controllable line‐commutated converter (CLCC) is an advanced direct current (DC) conversion device designed to address the commutation
Menghao Wen, Baohong Li, Qin Jiang, Tianqi Liu, Yingmin Zhang, Minrui Leng   +5 more
openaire   +2 more sources

Establishment of safety power range and subsequent commutation failure suppression strategy for hybrid cascaded HVDC system

International Journal of Electrical Power & Energy Systems
The hybrid cascaded high-voltage direct current (HC-HVDC) system integrates the benefits of both LCC and MMC technologies. However, the inverter LCC is prone to suffer subsequent commutation failure (SCF) when an AC fault occurs. Therefore, a coordinated
He Wang, Jiazhi Guo, Jing Bian, Guoqing Li, Tuo Wang   +4 more
doaj   +2 more sources

Real-Time Implementation of an Automatic Voltage Stabilizer for HVDC Control [Elektronisk resurs]

, 2012
Classic HVDC systems are prone to voltage instability when operating on weak AC grids. Certain methods are available to cope with weak system conditions, one of which is VDCOL.
Kuehn, Walter, Leelaruji, Rujiroj,, Vanfretti, Luigi,, Weyrich, Kim   +3 more
core   +8 more sources

An improved decision tree‐based method for evaluating transient overvoltage caused by commutation failure in LCC‐HVDC systems

IET Generation, Transmission &Distribution, Volume 17, Issue 23, Page 5124-5134, December 2023., 2023
Decision tree (DT) model is adopted to extract the mapping relationship between transient overvoltage and massive electrical quantities of power grids. The common DT algorithm is transformed by modifying the error weight assignment, which reflects the error tolerances for different actual overvoltage regions. To compensate for potential inaccuracies in
Zhe Zhang, Boyu Qin, Xin Gao, Yixing Zhang, Tao Ding   +4 more
wiley   +1 more source

Master‐slave control strategy of the cascaded multi‐terminal ultra‐high voltage direct current transmission system

IET Generation, Transmission &Distribution, Volume 17, Issue 16, Page 3638-3647, August 2023., 2023
This paper proposes an autonomous master‐slave control strategy suitable for the cascaded multi‐terminal UHVDC (CMT‐UHVDC) system to maintain voltage balance without real‐time communication between high‐end and low‐end valves. Several working conditions and the practical influence of sampling deviation on the control performance based on the ...
Sihang He, Liangliang Hao, Chang Liu, Jinghan He, Zhengguang Chen   +4 more
wiley   +1 more source

Suppression to concurrent commutation failure of UHVDC with hierarchical connection mode based on improved dc current prediction

IET Generation, Transmission &Distribution, Volume 17, Issue 8, Page 1902-1917, April 2023., 2023
An analytical expression among the dc current, ac voltage, and extinction angle of both layers is newly derived to find the dominant factors to the CCF. To improve the calculation accuracy, a three‐point sampling function using Newton interpolation is newly proposed to predict the dc current.
Shenghu Li, Yikai Li
wiley   +1 more source

Analysis and prevention of commutation failure caused by HVDC rectifier AC faults

IET Generation, Transmission &Distribution, Volume 16, Issue 7, Page 1416-1424, April 2022., 2022
Abstract Earlier works have reported that rectifier AC faults also can cause commutation failure during fault‐off recovery process. Whereas the occurrence of CF is merely ascribed to inverter AC faults in conventional wisdom. Note that the existing CF mitigation approaches are designed mostly by the evolution of inverter electrical quantities, which ...
Sheng Lin, Yuqing Lei, Jian Liu, Lei Liu
wiley   +1 more source

Control and Protection of Hybrid LCC-VSC HVDC Transmission System based on VDCOL Strategy

International Journal on Electrical Engineering and Informatics, 2022
The combination of line combined converter LCC and voltage source converter VSC technology provides the benefits of both techniques by constituting a hybrid LCC-VSC HVDC system.
Mohamed Amine Kazi, R. Majdoul, A. El-Alami, I. Baraka, N. Machkour   +4 more
semanticscholar   +1 more source

Hierarchical coordinated adaptive droop control for hybrid HVDC with cascaded multi‐infeed MMC inverters

IET Renewable Power Generation, Volume 16, Issue 6, Page 1148-1158, 27 April 2022., 2022
Abstract The hybrid HVDC with cascaded multi‐infeed MMC inverters will be put into reality soon in China, but its MMC inverter in constant DC voltage control would become a rectifier when disturbance happens. Thus, to solve such problem and enhance the stabilities, the adaptive droop control is proposed for MMC inverters and a hierarchical coordinated ...
Jingbo Zhao, Yan Tao
wiley   +1 more source