Switch time bifurcation elimination analysis in SVC plants

Studies show that switching angle of thyristor controlled reactor (TCR) in VAR compensator (SVC) plant, which is typically linked by a coupling transformer to the grid, misshapes current waveforms, which may lead to bifurcation and unsatisfactory operation of the station. A system model is developed...

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Bibliographic Details
Published inElectric power systems research Vol. 74; no. 2; pp. 177 - 185
Main Authors Rostami, M., Fathi, S.H., Abedi, M., Lucas, C.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.05.2005
Elsevier
Subjects
Applied sciences
Bifurcation
Control method
Coupling transformer
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Firing circuit and impedance
IRM
Power electronics, power supplies
Power networks and lines
Switching
TCR
Topology
ZCD
TCR
IRM
Bifurcation
Firing circuit and impedance
ZCD
Control method
Topology
Coupling transformer
Switching
Performance evaluation
Waveform
Power electronics
Harmonics suppression
Experimental result
Static VAr compensators
Comparative study
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Summary:Studies show that switching angle of thyristor controlled reactor (TCR) in VAR compensator (SVC) plant, which is typically linked by a coupling transformer to the grid, misshapes current waveforms, which may lead to bifurcation and unsatisfactory operation of the station. A system model is developed by intelligent resistance method (IRM) method and used to access the impact of coupling transformer on occurrence of bifurcation phenomenon. Next, methods for eliminating the bifurcation problem by TCR control procedures are presented and compared. A modified switching method, capable of eliminating the switch time bifurcation phenomenon and allowing SVC to perform freely in all control zones is elaborated. By using this method, the fundamental component of SVC current will be improved and harmonics will be reduced to acceptable levels, which guarantees the proper operation of SVC plant.
ISSN:0378-7796
1873-2046
DOI:10.1016/j.epsr.2004.09.011