A Feedback Linearization based UPFC Internal Controller for Power Flow Control

This paper presents a feedback linearization based controller design methodology for a unified power flow controller (UPFC) to achieve rapid ref- erence signal tracking in the internal control level. Feedback linearization is a nonlinear control technique based on differential geometry theory and over- comes the drawback of traditional linear PI control, which is typically tuned for one specific operating condition. In this paper, feedback linearization con- trol is developed for the UPFC dynamic model via an appropriate coordinate transformation and linear quadratic regulator control is then applied on the transformed linear system. The proposed control is validated via a detailed device-level simulation on a 11-bus system and a large scale simulation on the IEEE 118-bus and 300-bus systems. The proposed control is benchmarked against PI control.

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