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Damping Performance Analysis of IPFC and UPFC Controllers Using Validated Small-Signal Models

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4 Author(s)
Shan Jiang ; Electr. & Comput. Eng. Dept., Univ. of Manitoba, Winnipeg, MB, Canada ; Gole, A.M. ; Annakkage, U.D. ; Jacobson, D.A.

The paper discusses the dynamic behavior of two different flexible ac transmission system devices; the interline power-flow controller (IPFC) and the unified power-flow controller (UPFC) in a benchmark system. The small-signal model of the interline power-flow controller is developed and validated using detailed electromagnetic transients simulation. Using this validated model, the damping capabilities of the IPFC and the UPFC are compared and rationalized. From a small-signal dynamics point of view, it is shown that the series branches of these devices essentially segment the network creating a new structure. This structure change may be used to effectively improve system damping without requiring the design of a tuned feedback controller. The IPFCs two series branches in contrast to the UPFC's single series branch permit more opportunities for network segmentation. Hence, the IPFC has greater potential for improving the system's dynamic performance.

Published in:

Power Delivery, IEEE Transactions on  (Volume:26 ,  Issue: 1 )

Date of Publication:

Jan. 2011

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