An Add-On Self-Tuning Control System for a UPFC Application

This paper presents an add-on self-tuning (ST) control scheme for a Unified Power Flow Controller (UPFC) to assist its conventional PI control system in damping power oscillations. The ST control algorithm is based on a Pole Shift (PS) technique that has previously been successfully applied in Adapt...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 61; no. 5; pp. 2378 - 2388
Main Authors Malhotra, Urvi, Gokaraju, Ramakrishna
Format Journal Article
LanguageEnglish
Published IEEE 01.05.2014
Subjects
Adaptive control
Control systems
Damping
flexible AC transmission systems (FACTS)
Load flow
Oscillators
Power conversion
power systems control
self-tuning (ST) control
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Summary:This paper presents an add-on self-tuning (ST) control scheme for a Unified Power Flow Controller (UPFC) to assist its conventional PI control system in damping power oscillations. The ST control algorithm is based on a Pole Shift (PS) technique that has previously been successfully applied in Adaptive Power System Stabilizers (APSSs). For a wide range of operating conditions, the conventional PI-UPFC unless returned suffers from insufficient/nonoptimal damping performance. To overcome this problem, the authors propose supplementing the PI controllers with an ST feedback loop comprised of an identifier and a PS control algorithm. With a CRLS identifier tracking the system conditions online, this scheme eliminates the need for PI parameter retuning. Further, to correctly identify system parameters during large disturbances, a constrained recursive least squares (CRLS) identification procedure is adopted here. An improved damping performance with the proposed add-on scheme assisting the nonoptimal PI-UPFC is demonstrated for a two-area power system.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2013.2272272