Results 151 to 160 of about 1,639 (185)
Systematic transformation of urban cold chain networks: From cross-regional dependencies to sustainable local excellence. [PDF]
PLoS OneWang K, Fan K, Chen Y.
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Location of open conductor faults on LCC-HVdc transmission systems
High voltage direct current (HVdc) transmission systems are widely used for bulk energy transmission over large distances and the impact of short circuit faults on dc lines in these systems have been extensively studied. However, a type of fault that has hitherto not widely been investigated is the open circuiting of a conductor, as its occurrence is ...
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Study on Initialization Strategy of LCC-HVDC System
2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2020The initialization of line commutated converter based high voltage DC (LCC-HVDC) system is a difficult problem in the electromagnetic transient (EMT) simulation of large-scale AC-DC system. The traditional initialization method simulates the startup process of LCC-HVDC, which is not only time-consuming, but also difficult to match with the power flow ...
Xiaohui Ye +5 more
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An Accurate Small Signal Dynamic Model for LCC-HVDC
IEEE Transactions on Applied Superconductivity, 2021This paper develops an accurate small signal model for line commutated converter based HVDC (LCC-HVDC). The overall process of the model establishment is demonstrated from five parts: AC system, DC system, control system, phase-locked loop (PLL) and the converter.
Yuqing Dong +5 more
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Modeling of LCC-HVDC systems using dynamic phasors
2015 IEEE Power & Energy Society General Meeting, 2014This paper presents an average-value model of a line commutated converter-based HVDC system using dynamic phasors. The model represents the low-frequency dynamics of the converter and its ac and dc systems, and has lower computational requirements than a conventional electromagnetic transient (EMT) switching model. The developed dynamic-phasor model is
M. Daryabak +9 more
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Modelling and Control of Multiterminal LCC HVDC
2018 IEEE PES/IAS PowerAfrica, 2018Recent advances in the development and availability of multiple manufacturer for power electronics industries have made multiterminal-High Voltage Direct Current (HVDC) links possible and feasible. The multiterminal HVDC (MTDC) configuration is commonly referred to as ‘HVDC Grids’.
Oluwafemi E. Oni +2 more
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Decentralized Supplementary Control of Multiple LCC-HVDC Links
IEEE Transactions on Power Systems, 2016This paper presents a decentralized wide-area coordinated supplementary control of multiple line-commutated converter (LCC)-HVDC links to 1) prevent interactions among the HVDC links and 2) enhance the damping of the inter-area oscillatory modes. The proposed approach is based on the sparsity-promoting optimal control. The main features of the proposed
Sahar Pirooz Azad +2 more
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A Coordinated Marginal Current Control Method for LCC-HVDC
IEEE Transactions on Power Systems, 2019Line-commutated-converter-based HVdc (LCC-HVdc) is extensively used in modern power systems. Most of the LCC-HVdcs are implemented with the control strategy termed marginal current control method (MCCM), while their operation is sensitive to disturbance from the ac part of the system.
Jian Xu +8 more
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Dynamic Var Reserve Assessment in Multi-Infeed LCC-HVDC Networks
IEEE Transactions on Power Systems, 2021Recently, multi-infeed line-commutated converter-based high-voltage direct currents (LCC-HVDCs) represent one of the most attractive ways to accommodate large-scale power transfer in main load centers. However, this approach deteriorates the dynamic var reserve (DVR) in the receiving-end power grid, especially in scenarios with heavy loads.
Bo Hu +5 more
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Tapping existing LCC-HVdc systems with Voltage Source Converters
2016 IEEE Power and Energy Society General Meeting (PESGM), 2016This paper presents the application of a Full-bridge modular multi-level converter (FB-MMC) to tap an existing LCC-HVdc system. During faults, the dc voltage of the FB-MMC is controlled to reduce the fault current instead of blocking the converters. Electromagnetic Transient Simulations performed with PSCAD has been used to demonstrate the performance ...
D.H.R. Suriyaarachchi +2 more
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