Results 31 to 40 of about 210 (74)

Transient overvoltage suppression of LCC‐HVDC sending‐end system based on DC current control optimisation

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, Jianhang Zhu, Yingbiao Li, Jiabing Hu, Shicong Ma, Tiezhu Wang   +5 more
wiley   +1 more source

Establishment of safety power range and subsequent commutation failure suppression strategy for hybrid cascaded HVDC system

International Journal of Electrical Power & Energy Systems
The hybrid cascaded high-voltage direct current (HC-HVDC) system integrates the benefits of both LCC and MMC technologies. However, the inverter LCC is prone to suffer subsequent commutation failure (SCF) when an AC fault occurs. Therefore, a coordinated
He Wang, Jiazhi Guo, Jing Bian, Guoqing Li, Tuo Wang   +4 more
doaj   +1 more source

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, Zhijie Liu, Kejun Li, Bingkun Li, Jiachen Li, Liangzi Li   +5 more
wiley   +1 more source

A modified control strategy for LCC with IGCT‐based full‐bridge submodules to solve the commutation failure issues

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, Xiangjun Zeng, Yiping Luo, Haitao Qu   +3 more
wiley   +1 more source

Research on optimized control strategy for LCC-CLCC Receiving-End under different Degrees of Three-Phase fault conditions

International Journal of Electrical Power & Energy Systems
Compared with traditional Line-Commutated Converters (LCCs), the Controllable Line-Commutated Converter (CLCC) exhibits a significantly enhanced immunity to commutation failures.
Weiru Wang, Yuxuan Li, Tuo Wang, Yechun Xin, Guoqing Li, Hairun Guo   +5 more
doaj   +1 more source

StudyofHVDCPiecewiseVariableRateVDCOLBasedonSimplexAlgorithm

工程科学与技术, 2015
:In order to improve the performance of failure recovery characteristic of the HVDC,a novel VDCOL control method named piecewise-variable-rate VDCOL is proposed based on the study of VDCOL’s influence on the HVDC system’s reactive power consumption and ...
冯明, 李兴源, 李妮, 王超, 洪潮   +4 more
doaj  

有利于多馈入系统恢复的自适应变结构VDCOL控制

Gaoya dianqi, 2016
针对多馈入直流系统故障后难以快速恢复的问题,提出了一种基于模糊理论,并融合多馈入直流特性的自适应变结构VDCOL控制策略。该控制方法将模糊控制的非线性特性与VDCOL控制机理有效结合,同时将多条直流自身的强度和相互作用考虑在内,根据电压大小及其恢复水平对直流电流进行动态控制,协调系统的电压和功率恢复。仿真结果表明:该控制方法能够有效控制恢复期间的无功需求,抑制后续换相失败发生,加快系统的恢复,保证系统的安全稳定运行。
胡松伶, 王渝红, 李兴源
doaj  

直流控制对逆变器无功调节特性影响的研究

Gaoya dianqi, 2016
为了改善直流逆变站的无功功率特性,合理利用直流系统本身的无功调节特性来提升弱受端系统的电压稳定性,对直流控制方式与逆变器无功需求之间的关系进行了比较详细的分析。基于弱受端直流系统模型,首先根据直流系统Ud-Id特性曲线分析得到直流系统各种可能的控制模式下的无功特性,以及各控制模式对无功功率的调节能力;然后分析了熄弧角裕度、VDCOL参数、控制器调节速度这3种因素对逆变器无功调节的影响,并根据仿真结果总结了它们的调节规律及作用范围。对弱受端直流系统无功调节策略的确定具有一定的指导意义。
李妮, 李兴源, 冯明, 洪潮, 王超   +4 more
doaj  

Modeling of Efficient Control Strategies for LCC-HVDC Systems: A Case Study of Matiari-Lahore HVDC Power Transmission Line. [PDF]

Sensors (Basel), 2022
Ahmed A, Khan D, Khan AM, Mustafa MU, Panjwani MK, Hanan M, Agyekum EB, Uhunamure SE, Edokpayi JN.   +8 more
europepmc   +1 more source

Optimization voltage-dependent current order limiter parameters for improving the voltage stability of multi-DC receiving-end power grid

Journal of Physics: Conference Series
Power grids with multi-DC high voltage direct current (HVDC) commonly face challenges such as inadequate voltage support, exacerbated interactions between AC and DC, and complex and variable operation modes.
Yijing Zhang, Yanqiang Shi, Jiachen Liu, Minjie Huang, Heyu Luo, Xiaolong Liu   +5 more
semanticscholar   +1 more source