Results 241 to 250 of about 1,303 (282)
Some of the next articles are maybe not open access.
Study on commutation failure in an HVDC inverter
POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002Commutation 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 +2 more
openaire +1 more source
Rectifier Transformer Saturation on Commutation Failure
Fusion Technology, 1989The 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
Commutation failures in HVDC transmission systems
IEEE Transactions on Power Delivery, 1996This 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
openaire +1 more source
Commutating failure of a single-phase line-commutated inverter
Proceedings of 1994 IEEE Workshop on Computers in Power Electronics, 2002This 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, 2016This 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 +6 more
openaire +1 more source
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
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), 2019Commutation 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 analysis and simulation of commutation failure and protection strategies
2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011Studying the HVDC typical fault-the commutation failure and its protection measures will give some guidance for HVDC engineering, also, it will improve the AC-DC power system safety and reliability with great significance. Based on the analysis of commutation failure of HVDC, the article studies the effect of the commutation failure when the ...
Jing Wang +3 more
openaire +1 more source
Preventive Control optimization of Commutation Failure Based
2020 IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia), 2020In the hybrid AC/DC systems, AC system failures may cause the commutation failure of DC system, which will lead to DC blocking and affect the safety and stability of the system. This paper proposes a reactive power optimization method to reduce the risk of system commutation failure.
Li Li +5 more
openaire +1 more source
The Impact of HVDC Commutation Failure on the Distance Protection
2010 Asia-Pacific Power and Energy Engineering Conference, 2010According 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 +3 more
openaire +1 more source