DocumentCode :
773268
Title :
Mitigation of Subsynchronous Resonance in a Series-Compensated Wind Farm Using FACTS Controllers
Author :
Varma, Rajiv K. ; Auddy, Soubhik ; Semsedini, Ysni
Author_Institution :
Dept. of Electr. & Comput. Eng., Western Ontario Univ., London, ON
Volume :
23
Issue :
3
fYear :
2008
fDate :
7/1/2008 12:00:00 AM
Firstpage :
1645
Lastpage :
1654
Abstract :
The rapid growth of wind power systems worldwide will likely see the integration of large wind farms with electrical networks that are series compensated for ensuring stable transmission of bulk power. This may potentially lead to subsynchronous-resonance (SSR) issues. Although SSR is a well-understood phenomenon that can be mitigated with flexible ac transmission system (FACTS) devices, scant information is available on the SSR problem in a series-compensated wind farm. This paper reports the potential occurrence and mitigation of SSR caused by an induction-generator (IG) effect as well as torsional interactions, in a series-compensated wind farm. SSR suppression is achieved as an additional advantage of FACTS controllers which may already be installed in the power system for achieving other objectives. In this study, a wind farm employing a self-excited induction generator is connected to the grid through a series-compensated line. A static var compensator (SVC) with a simple voltage regulator is first employed at the IG terminal in addition to the fixed shunt capacitor for dynamic reactive power support. The same SVC is shown to effectively damp SSR when equipped with an SSR damping controller. Also, a thyristor-controlled series capacitor (TCSC) that is actually installed to increase the power transfer capability of the transmission line is also shown to damp subsynchronous oscillations when provided with closed-loop current control. While both FACTS controllers-the SVC and TCSC-can effectively mitigate SSR, the performance of TCSC is shown to be superior. Extensive simulations have been carried out using EMTDC/PSCAD to validate the performance of SVC and TCSC in damping SSR.
Keywords :
asynchronous generators; flexible AC transmission systems; power capacitors; power grids; power system CAD; power system interconnection; power transmission control; reactive power; static VAr compensators; wind power plants; EMTDC; FACTS controllers; PSCAD; dynamic reactive power support; fixed shunt capacitors; flexible ac transmission system; grid connection; power transfer capability; self-excited induction generators; series-compensated wind farms; static var compensator; subsynchronous oscillation damping; subsynchronous resonance mitigation; subsynchronous-resonance; thyristor-controlled series capacitor; wind power systems; Control systems; Damping; Flexible AC transmission systems; PSCAD; Power capacitors; Resonance; Static VAr compensators; Thyristors; Wind energy; Wind farms; Flexible ac transmission systems (FACTS); self-excited induction generator (SEIG); series compensation; static VAR compensator (SVC); subsynchronous resonance (SSR); thyristor-controlled series capacitor (TCSC); wind power systems;
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/TPWRD.2008.917699
Filename :
4550616
Link To Document :
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