Results 31 to 40 of about 246 (86)
IET Generation, Transmission &Distribution, Volume 19, Issue 1, January/December 2025.In order to address the limitations of conventional strategies, this paper proposes a staged reactive power control strategy that employs a combined criterion based on the magnitude of the AC voltage dip and the extinction angle. The proposed strategy enables dynamic adjustment of reactive power during severe AC voltage dips, thereby ensuring voltage ...
Xianbo Ke, Jun Liu
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Study on working condition of 750 kV AC filter breaker in ± 1100 kV UHVDC system
The Journal of Engineering, Volume 2019, Issue 16, Page 839-844, March 2019., 2019 In this article, the Changji‐Guquan ± 1100 kV ultra‐high voltage direct current (UHVDC) system has been established by PSCAD software, especially for the arc of the circuit breakers. The AC filter groups and the control strategy have been analysed based on the reactive power demand of this system, AC system voltage amplitude, and harmonic limit.
Zexin Zhao +4 more
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Available transfer capability analysis method of AC–DC power system based on security region
The Journal of Engineering, Volume 2019, Issue 16, Page 2386-2390, March 2019., 2019 Available transfer capability (ATC) refers to the reliable power transfer capability for further commercial activities in the system based on current protocols. Traditional ATC method such as continuation power flow (CPF) can calculate ATC only based on a specific direction of load and generator, optimal power flow (OPF) cannot acquire accurate value ...
Sicheng Wang, Shan Gao
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International Journal of Electrical Power & Energy SystemsHVDC systems are vulnerable to commutation failure due to insufficient commutation margin during AC faults, which threatens system stability. Existing optimization strategies are often computationally complex and heavily reliant on simulation models ...
Tongtong Zhang, Shuqing Zhang
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International Journal of Electrical Power & Energy SystemsThe fast DC current recovery is widely adopted in the existing Voltage Dependent Current Order Limiter (VDCOL) for Line Commutated Converter-based High Voltage Direct Current (LCC-HVDC) systems to mitigate transient overvoltage in the sending-end grid ...
Bo Pang +6 more
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Improved VDCOL Control Method of Multiple HVDC Systems for Commutation Failure Mitigation
ElectronicsThe voltage-dependent current order limiter (VDCOL) is an important link in the current control of HVDC systems. However, due to the fixed startup voltage threshold and the fixed slope of the characteristic curve, its control performance in complex ...
Yan-Qi Hou +3 more
semanticscholar +1 more source
IET Energy Systems Integration, Volume 6, Issue 2, Page 182-195, June 2024.Abstract The receiving‐end system AC fault of the line‐commutated‐converter‐based high voltage direct current (LCC‐HVDC) will lead to commutation failure of the inverter side. During the fault and its recovery, AC transient low voltage and transient overvoltage (TOV) will occur in the sending‐end system.
Yang Wang +5 more
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DYNAMIC STUDIES OF MULTITERMINAL DC-AC SYSTEMS [PDF]
, 1984 In transient stability programs that use a static dc network representation, the procedure to determine the control mode of operation and the solution of the multiterminal dc system is complex and time consuming.
HAMZEI-NEJAD, ALIREZA
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A fast and high‐accurate commutation failure identification method for LCC‐HVDC system
High Voltage, Volume 9, Issue 3, Page 721-732, June 2024.Abstract Commutation failure (CF) is one of the most common issues in line‐commuted converter‐based high voltage direct current systems (LCC‐HVDC), leading to critical power system security and stability problems. Accurate and rapid identification of CF is crucial to prevent subsequent CF in HVDC systems. However, the existing CF identification methods
Jing Feng +5 more
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IET Power Electronics, Volume 17, Issue 2, Page 183-198, 5 February 2024.The paper proposes a hybrid solution combining the LCC inverter with the continuously controlled IGCT‐based full‐bridge submodules (FBSMs) to solve the CF issues. The scheme can provide the LCC inverter with an additional commutation area, and compensate for the phase‐shift of the grid voltage under faults.
Yindi Liu +3 more
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