Results 31 to 40 of about 3,066,783 (329)
A coordination control strategy to suppress commutation failure based on LCC-VSC
Energy Reports, 2021 The receiving end hybrid LCC-VSC system is a new type of hybrid DC transmission system. In order to suppress continuous commutation failure, this paper optimizes and improves the firing angle control strategy of LCC with AC fault voltage and the DC power
Jiaqi Liu +2 more
doaj +1 more source
Improving skills in rounding off the whole number [PDF]
, 2017 This study was conducted to address teaching and learning skills in rounding off a whole number. This study consisted of 15 years 4 students from the Kong Nan Chinese Primary School, Parit Raja, Johor, Malaysia.
Khalid, Kamil +8 more
core +1 more source
A predictive control strategy for mitigation of commutation failure in LCC-based HVDC systems [PDF]
, 2018 High-voltage direct-current (HVDC) systems are being widely employed in various applications because of their numerous advantages such as bulk power transmission, efficient long-distance transmission, and flexible power-flow control.
Booth, Campbell +5 more
core +1 more source
Commutation failure suppression strategy of hybrid DC transmission based on active current limiting
电力工程技术, 2022 Aiming at the problem of large inrush current when the commutation fails in the hybrid direct current (DC) transmission system,the relationship between the inrush current amplitude and the voltage source converter (VSC) is firstly derived.
MA Wenzhong +5 more
doaj +1 more source
Hybrid HVDC for integrating wind farms with special consideration on commutation failure [PDF]
, 2015 This paper presents the control and operation of a hybrid HVDC system comprising a wind farm side VSC rectifier and a grid side LCC inverter for integrating wind power.
Finney, Stephen J. +4 more
core +1 more source
A Commutation Failure Prediction and Mitigation Method
Journal of Modern Power Systems and Clean Energy, 2022 The mitigation of commutation failure (CF) depends on the accuracy of CF prediction. In terms of the large error of the existing extinction angle (EA) calculation during the fault transient period, a method for CF prediction and mitigation is proposed. Variations in both DC current and overlap angle (OA) are considered in the proposed method to predict
Renlong Zhu +4 more
openaire +2 more sources
Partial discharge behavior under operational and anomalous conditions in HVDC systems [PDF]
, 2017 Power cables undergo various types of overstressing conditions during their operation that influence the integrity of their insulation systems. This causes accelerated ageing and might lead to their premature failure in severe cases.
Azizian Fard, M. +3 more
core +3 more sources
IEEE Access, 2021 When the large-scale wind power is sent out through the high voltage direct current (HVDC) transmission system and a DC commutation failure occurs, the voltage of AC bus at the sending end decreases first and then increases.
Wei Li +6 more
doaj +1 more source
Mitigating commutation failures in HVDC systems with SFCL deployment
International Journal of Electrical Power & Energy Systems, 2023 Commutation failures represent a prevalent issue encountered in line-commutated-converter high voltage direct current (LCC-HVDC) systems. As the widespread deployment of HVDC systems continues, the risk associated with commutation failures increases, posing a growing threat to power grids due to their potential to trigger severe consequences, including
Qihuan Dong +5 more
openaire +4 more sources
Thermofield-Bosonization on Compact Space [PDF]
, 2014 We develop the construction of fermionic fields in terms of bosonic ones to describe free and interaction models in the circle, using thermofielddynamics. The description in the case of finite temperature is developed for both normal modes and zero modes.
Amaral, R. L. P. G., Belvedere, L. V.
core +1 more source