Results 11 to 20 of about 756 (255)
Adaptive firing angle compensation control for mitigating DC subsequent commutation failure
电力工程技术, 2022 Subsequent commutation failure of the high voltage direct current (HVDC) transmission system has a seriously negative impact on the stable operation of the AC-DC hybrid power grid.
YANG Chengxiang +5 more
doaj +1 more source
Suppression strategy for subsequent commutation failure of DC system based on improved VDCOL
电力工程技术, 2022 Aiming at the problem of subsequent commutation failure during the fault recovery period after the first commutation failure of high voltage direct current system,the recovery process is divided into the first commutation failure (stage 1),the beginning ...
CHEN Ruikang +3 more
doaj +1 more source
The failure of the uncountable non-commutative Specker Phenomenon [PDF]
Journal of Group Theory, 2001 Higman proved in 1952 that every free group is non-commutatively slender, this is to say that if G is a free group and h is a homomorphism from the countable complete free product (X_omega Z) to G, then there exists a finite subset F of omega and a homomorphism h:*_{i in F} Z --> G such that h=h rho_F, where rho_F is the natural map from (X_{i in ...
Shelah, Saharon, Strüngmann, Lutz
openaire +2 more sources
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
Research on Battery Energy Storage STATCOM Suppressing HVDC Commutation Failure
Frontiers in Energy Research, 2022 Due to the poor performance of traditional STATCOM in DC engineering, a compensation method using battery energy storage STATCOM (STATCOM/BESS) to suppress commutation failure of the weak receiving-end high voltage direct current transmission system is ...
Chao Xing +6 more
doaj +1 more source
Research on Commutation Failure in Multi-feed HVDC Transmission System
发电技术, 2020 HVDC transmission systems present a risk of commutation failure. For multi-infeed HVDC transmission systems, due to the interaction between AC and DC systems, the commutation failure of a single inverter station may cause multiple inverter stations to ...
Jiaming WANG, Hao YU, Wuhui CHEN
doaj +1 more source
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
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
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
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