Results 211 to 220 of about 788 (253)

Research on Commutation Failure of HVDC

Advanced Materials Research, 2013
The waveforms of the RTDS(Real Time Digital Simulator) commutation failure and ABB MACH2 system commutation failure protection have been combined to analyze the mechanism of HVDC commutation failure. Several reasons for inverter commutation failure have been found, and a detailed analysis is also been given for the missing pulse and commutation which ...
Tang Xian Chen, Jun Jie Luo, Jie Hong Lu
openaire   +1 more source

Commutation failures in HVDC transmission systems

IEEE Transactions on Power Delivery, 1996
This paper provides a formulation for the initiation or onset mechanism of commutation failures in line-commutated thyristor power converters, assuming infinite (zero impedance) AC systems. A theoretical development and a parametric analysis is given. Theory validation by simulation and comparison to actual field experience data is also given.
C.V. Thio, J.B. Davies, K.L. Kent
exaly   +2 more sources

Study on commutation failure in an HVDC inverter

POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002
Commutation failures (CF) are very frequent dynamic events in HVDC power systems. In this paper, a simplified thyristor lumped-charge model is used to analyze the change of the stored charges in the device during turn-off and the commutation process in an HVDC inverter is studied theoretically.
null Zou Gang, null Zheng Jianchao, null Chen Xiangxun   +2 more
openaire   +1 more source

Rectifier Transformer Saturation on Commutation Failure

Fusion Technology, 1989
The rectifier transformer's service differs from the power transformer's service because of the rectifier load. Under certain fault conditions, such as a commutation failure, d.c.
E. Lu, G. Bronner
openaire   +1 more source

Commutating failure of a single-phase line-commutated inverter

Proceedings of 1994 IEEE Workshop on Computers in Power Electronics, 2002
This paper introduces a new point of view to resolve the commutating failure of a single-phase line-commutated inverter. It is widely believed that the outbreak of this failure is due to the turn-off characteristics of an actual device. From this viewpoint, the safety marginal angle (/spl gamma//sub min/) has been recommended as a practice of ...
openaire   +1 more source

A STATCOM compensation scheme for suppressing commutation failure in HVDC

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society, 2016
This paper proposes a STATCOM compensation scheme for suppressing commutation failure (CF) in HVDC. In this scheme, the neutral-point of CHB-STATCOM with star configuration is grounded and thus possesses three advantages. Firstly, it keeps the high economy of CHB-STATCOM with star configuration.
Qingqing Zheng, Xuan Wang, Yongsheng Fu, Hui Yan, Zhujian Ou, Guangzhu Wang, Yubin Wang   +6 more
openaire   +1 more source

Development of a novel commutation method that sharply reduces commutation failure of matrix converters

Electrical Engineering in Japan, 2009
AbstractThis paper proposes the safest novel commutation method for a matrix converter. There are two conventional commutation methods which depend on the polarity of the input line voltage (it is called “voltage commutation”) and depend on the polarity of the output current (it is called “current commutation”).
Koji Kato, Jun‐Ichi Itoh
openaire   +1 more source

Commutation Failure Mitigation Method Based on Improved Commutation Area in HVDC system

2019 IEEE 8th International Conference on Advanced Power System Automation and Protection (APAP), 2019
Commutation failure (CF) is one of the major concerns in high-voltage direct current (HVDC) transmission system. Of many methods to mitigate CF, advancing firing angle is preferred one since it can be easily implemented in current HVDC controllers without extra hardware modification.
Haozong Wang, Xinzhou Dong
openaire   +1 more source

The Impact of HVDC Commutation Failure on the Distance Protection

2010 Asia-Pacific Power and Energy Engineering Conference, 2010
According to the characteristics of distance protection principle and based on PSCAD/EMTDC, this paper first simulates and analyzes the variation characteristics of HVDC equivalent power-frequency current under the different situations of commutation failures.
Pu Zhang, Haifeng Li, Gang Wang, Gelan Zhu   +3 more
openaire   +1 more source

Investigation on a prognosis method of the HVDC commutation failure

2016 IEEE 11th Conference on Industrial Electronics and Applications (ICIEA), 2016
In order to judge commutation failure faster and more accurately, a new prognosis method was proposed. The physical mechanism of a three-phase full wave rectifier circuit was analyzed, and an arc angle formula based on impedance parameters was proposed to judge commutation failure.
Hongmei Li, Zheng Xin, Liyang Jiang, Li Zhang   +3 more
openaire   +1 more source