Results 121 to 130 of about 340 (170)

Line inductance measurement by using commutation time in line commutated converters

Electrical Engineering, 2009
Finding line inductance using wiring diagrams of the network is usually difficult or even impossible. In general, line inductance has to be measured in a simple nondisruptive way without service interruption. Several line inductance measurement techniques have been suggested previously, but they suffer from a number of limitations.
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A Backup Protection Algorithm for Bipolar Line-Commutated Converter HVDC Lines

IEEE Systems Journal, 2021
This article proposes a new backup protection algorithm for bipolar high voltage alternative current (HVdc) lines using two-end synchronized sampled currents. Unlike traditional differential protection, the proposed algorithm can be applied to detect and recognize the faulted poles directly without the requirements for long time delay.
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Line-Commutated Converters and Inverters

1977
The method by which AC supply voltage is used for the commutation of conducting SCRs has been discussed in Chapter 6; it is very convenient for both rectification and inversion in phase-controlled bridge circuits and midpoint-connection circuits. This method of commutation is referred to as class F type of commutation (see Chapter 8), and is also known
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Control and Performance of a Self-Commutated GTO Converter Operating in Parallel With Line-Commutated Thyristor Converters

IEEE Transactions on Industrial Electronics, 2004
Recently, static var generators (SVGs) or static synchronous compensators based on self-commutated converters have been put into practical use for the purpose of compensation for reactive power, power swings damping, and/or voltage control in power systems.
S. Tamai, S. Murakami, R. Uchida, H. Akagi   +3 more
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CLOSED MATHEMATICAL DESCRIPTION OF LINE COMMUTATED CONVERTER-DRIVES

IFAC Proceedings Volumes, 1983
Abstract By shifting the solution of problems to the software of microprocessors any complex control structure in electrical drive engineering can be executed. This essential presumption for solving the problem this way is the exact mathematical description of the drive system in order to enable the microprocessor to get deeper insight into the state
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Generalized analysis of line commutated converters and close relatives

1987 IEEE Power Electronics Specialists Conference, 1987
Various schemes have been proposed to improve the power displacement factor and distortion of large ac to dc converters by using either free-wheeling diodes and thyristors or forced commutation devices operating at low frequency. This paper presents a generalized analysis of those converters and shows that various existing configurations can be ...
G. Olivier, G.-E. April, S. Manias, C. Ismail El Hadjri   +3 more
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MULTI-STEP LINE- AND SELF-COMMUTATED SINGLE-PHASE BRIDGE CONVERTER

IFAC Proceedings Volumes, 1977
Abstract By means of fully controllable multi-step two-pulse bridge convertors d.c. loads as inverters or d.c. machines can be fed with variable voltage and current at increased line side power factor. These connections can be used for both rectifier- and inverter operation. Resistance braking is possible.
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Investigation of line-commutated three-phase converters with impedance unbalance

Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference, 2010
Current converters operated in unbalanced electrical three-phase systems will generally work asymmetrically, which causes the appearance of non-characteristic harmonics and therefore higher distortion levels. In this paper unbalances are considered, that are caused by asymmetrical AC-line short-circuit impedances, which are usually a result of ...
M. Weiland, G. Herold, T. Freudenstein
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Approximate dynamic average-value model for controlled line-commuted converters

2011 24th Canadian Conference on Electrical and Computer Engineering(CCECE), 2011
Dynamic average-value modeling of power electronic-based systems has evolved and is widely used for system-level transient simulations and small-signal analysis. This paper presents an approximate average model for controlled line-commutated converters, which is developed based on the parametric average modeling methodology previously established for ...
Hamid Atighechi, Sina Chiniforoosh, Juri Jatskevich   +2 more
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Design of commutator configurations for the protection of a line commutated converter

Conference Record of the IEEE Industry Applications Society Annual Meeting, 2003
The author establishes design procedures and design illustrations for the following three practical commutator configurations: series commutator; half-bridge shunt commutator; and coupled full-bridge shunt. The first two commutators are designed for small load inductances.
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