Results 41 to 50 of about 702,260 (344)

High voltage direct current (HVDC) transmission: Future expectation for Pakistan

open access: yesCSEE Journal of Power and Energy Systems, 2019
An HVDC transmission system for bulk power transfer over longer distance offers numerous advantages over an alternating current (AC) transmission system, such as direct integration of networks operating at different frequencies, comparatively low line ...
Kamran Hafeez, Shahid A. Khan
doaj   +1 more source

HVDC grids stability improvement by direct current power system stabilizer

open access: yesIET Generation, Transmission & Distribution, 2022
High‐voltage direct current breaker is among the essential components of high‐voltage direct current grids. Such a breaker generally needs a direct current reactor to reduce the fault currents rate.
Neda Azizi   +2 more
doaj   +1 more source

Intelligent fault detection and location scheme for modular multi‐level converter multi‐terminal high‐voltage direct current

open access: yesHigh Voltage, 2020
National Natural Science Foundation of China, Grant/Award Number: 51807008 Abstract In order to overcome the drawbacks of the conventional protection methods in high‐ voltage direct current transmission lines, a deep learning approach is proposed that ...
Qingqing Yang   +4 more
semanticscholar   +1 more source

An Overview of HVDC Technology

open access: yesEnergies, 2020
There is a growing use of High Voltage Direct Current (HVDC) globally due to the many advantages of Direct Current (DC) transmission systems over Alternating Current (AC) transmission, including enabling transmission over long distances, higher ...
Neville R. Watson, Jeremy D. Watson
doaj   +1 more source

Cooperative Voltage and Frequency Regulation with Wind Farm: A Model-Based Offline Optimal Control Approach

open access: yesEnergies, 2023
Converter blocking is a serious malfunction encountered in high voltage direct current (HVDC) transmission systems. During sending-end converter blocking, the resultant active power and reactive power surplus in the sending-end power system lead to a ...
Hua Li   +5 more
doaj   +1 more source

A predictive control with flying capacitor balancing of a multicell active power filter [PDF]

open access: yes, 2008
Unlike traditional inverters, multicell inverters have the following advantages: lower switching frequency, high number of output levels, and less voltage constraints on the insulated-gate bipolar transistors.
Llor, Ana-Maria   +2 more
core   +1 more source

Design of ± 535 kV hybrid high voltage direct current (HVDC) circuit breaker

open access: yesIET Generation, Transmission & Distribution, 2022
This paper proposes a ± 535 kV hybrid high voltage direct current (HVDC) circuit breaker. In this paper, the interruption processes of the main branch, transferring branch, and MOV (metal oxide varistors) branch are studied by PSCAD/EMTDC computer ...
Chenyang Liu   +4 more
doaj   +1 more source

Review of high voltage direct current cables [PDF]

open access: yesCSEE Journal of Power and Energy Systems, 2015
Increased renewable energy integration and international power trades have led to the construction and development of new HVDC transmission systems. HVDC cables, in particular, play an important role in undersea power transmission and offshore renewable energy integration having lower losses and higher reliability. In this paper, the current commercial
Chen, George   +5 more
openaire   +2 more sources

Power Control of a Nonpitchable PMSG-Based Marine Current Turbine at Overrated Current Speed With Flux-Weakening Strategy [PDF]

open access: yes, 2014
This paper deals with power control strategies for a fixed-pitch direct drive marine current turbine (MCT) when the marine current velocity exceeds the rated value corresponding to the MCT nominal power.
SCUILLER, Franck   +6 more
core   +1 more source

Research on Thyristor Reverse Recovery Behavior in High-Voltage Direct Current Transmission Converter Valves and Its Application in Integrated Protection Systems

open access: yesEnergies
The performance of converter valves is essential for the reliability and efficiency of high-voltage direct current (HVDC) transmission systems. Converter valves consist of multiple thyristor levels, each requiring regular testing to ensure proper ...
Cao Wen   +7 more
doaj   +1 more source

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