Modeling line-commutated converter HVDC transmission systems using dynamic phasors
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Date
2014-08, 2013
Authors
Daryabak, Mehdi
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
IEEE
IEEE
Abstract
This thesis develops the dynamic phasor model of a line-commutated converter (LCC) high-voltage direct current (HVDC) transmission system. The mathematical definition and properties of dynamic phasors are utilized to model both the dc-side and the ac-side of a LCC-HVDC transmission system as well as 6-pulse Graetz bridge, which is the building block of such a system.
The developed model includes low-frequency dynamics of the systems, i.e., fundamental frequency component (50 Hz) at the ac-side and dc component at the dc-side, and removes high-frequency transients. The developed model, however, is capable of accommodating higher harmonics if necessary. The model is also able to simulate the system during abnormal modes of operations such as unbalanced operation and commutation failure. In order to develop the dynamic phasor model of a line-commutated converter, the concept of switching functions is utilized.
The developed model is capable of capturing large-signal transients of the system as well as steady state operating conditions. The model can be used in order to decrease the computational intensity of LCC-HVDC simulations. The developed model in this thesis enables the user to consider each harmonic component individually; this selective view of the components of the system response is not possible to achieve in conventional electromagnetic transient simulations.
Description
Keywords
Dynamic average modeling, Dynamic phasors, EMT simulation, line commutated converter (LCC) HVDC
Citation
M. Daryabak, S. Filizadeh, J. Jatskevich, A. Davoudi, M. Saeedifard, V. K. Sood, J. A. Martinez, D. Aliprantis, J. Cano, A. Mehrizi-Sani, "Modeling of LCC-HVDC Systems Using Dynamic Phasors," IEEE Transaction on Power Delivery, vol. 29, no. 4, pp. 721-726, Aug 2014.
M. Daryabak, S. Filizadeh, "Analysis of Waveform Approximation for the AC Current of a Line-Commutated Converter," in The 3rd International Conference on Electric Power and Energy Conversion Systems (EPECS), Istanbul, 2013.
M. Daryabak, S. Filizadeh, "Analysis of Waveform Approximation for the AC Current of a Line-Commutated Converter," in The 3rd International Conference on Electric Power and Energy Conversion Systems (EPECS), Istanbul, 2013.