Results 181 to 190 of about 11,006 (219)
Some of the next articles are maybe not open access.
Fault transient simulation analysis for HVDC transmission lines
2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2015Fault transient analysis plays an important role in protection and fault location research for high voltage direct current (HVDC) transmission lines. Fault transient simulation methods and analysis for HVDC transmission lines are detailed presented in this paper, to avoid repetitive tasks and waste of research efforts. Influences of the control system,
Luhua Xing +4 more
openaire +1 more source
A Fault Location Method for HVDC Transmission Lines
Applied Mechanics and Materials, 2014A fault location method for HVDC (High Voltage Direct Current) transmission lines is proposed in this paper, using voltages and currents measured at two terminals of dc lines in time domain. Fault traveling waves propagate from the fault point to both terminals along the faulted line.
Lu Hua Xing, Qing Chen, Bing Lei Xue
openaire +1 more source
A novel protection scheme for HVDC transmission line
2011 International Conference on Advanced Power System Automation and Protection, 2011The formation of the transient capacitive current and its effects on the HVDC transmission line differential protection is analyzed based on the wave propagation principle in this paper. The magnitude of capacitive current in the transient process of DC line fault is directly proportional to the time difference of fault signal travelling to both ...
XiaoDong Zheng +6 more
openaire +1 more source
A Transient Protection Scheme for HVDC Transmission Line
IEEE Transactions on Power Delivery, 2012The relation between the parameters of dc transmission line and the variation of transient energy has been analyzed under various fault conditions in this paper. According to that, a new transient energy protective scheme is proposed. It is developed based on the distributed parameter line model in which the transient energy distribution over the line ...
Xiaodong Zheng +3 more
openaire +1 more source
The fault location method for HVDC transmission line
2006 China International Conference on Electricity Distribution (CICED 2006), 2006The integrative fault location approach which combines the single terminal, dual terminals traveling wave location method and traditional fault location method has been brought forward. The new approach could fetch up the deficiency of the dual terminals traveling wave location method. The possible unsuccessful case of traveling wave fault location has
null Yongchang Zhai, null Haifeng Zhang
openaire +1 more source
Degree of corona saturation for HVDC transmission lines
IEEE Transactions on Power Delivery, 1990The DC electric field and ion density are two of the electrical quantities of interest that characterize the electrical environment of HVDC (high-voltage direct-current) transmission lines. The author presents an overview of the electric field and ion environment of HVDC transmission lines and introduces the concept of degree of corona saturation.
openaire +1 more source
VSC-HVDC transmission line faults location using active line impedance estimation
2012 IEEE International Energy Conference and Exhibition (ENERGYCON), 2012This paper describes the use of an active impedance estimation technique to accurately locate faults in a VSC-HVDC system transmission line. This method uses the power converters already installed in the HVDC system, without requiring any external additional hardware or intervention.
Mohammed Shukr +2 more
openaire +1 more source
Shielding Effect of HVAC Transmission Lines on the Ion-Flow Field of HVDC Transmission Lines
IEEE Transactions on Power Delivery, 2013The HVDC and HVAC transmission lines running on the same tower is a promising technology to improve the transmission capacity of an existing corridor. The ions generated by corona discharge of HVDC transmission lines will strengthen the ground-level electric field, which may endanger human exposure.
Xiangxian Zhou +7 more
openaire +1 more source
Protection of Multi-Terminal VSC HVDC Hybrid Transmission Line
2023This paper presents a fast fault detection scheme for a hybrid line in a multi-terminal (MT) voltage source converter (VSC) high voltage DC (HVDC) system. The proposed method is based on the primary and secondary protection scheme. The discrete wavelet transforms (DWT) with Teager energy operator (TEO) and voltage polarity comparison are applied to ...
Farkhani, Jalal Sahebkar; id_orcid 0000-0002-6788-7588 +4 more
openaire +1 more source
Fault Location for HVDC Transmission Lines Using Interference Cancellation
2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia), 2019Currently fault location for HVDC transmission lines demands high sampling frequency and suffers from large fault resistance. In this paper, accurate location at relatively low sampling frequency is obtained with interference cancellation. The CWT (continuous wavelet transformation) is adopted to extract the main component of natural frequencies using ...
Yongchao Sun +6 more
openaire +1 more source