Feedback linearization internal control for the unified power flow controller

This paper presents a feedback linearization based controller design methodology for a unified power flow controller (UPFC) to achieve rapid reference signal tracking in the internal level. Feedback linearization control (FBLC) is a nonlinear technique based on differential geometry theory and overcomes the drawback of traditional PI control linearzing at one specific operating condition. FBLC is applied on UPFC dynamic model via an appropriate coordinate transformation and LQR control is then applied on the transferred linear system. The proposed control is validated on the IEEE 118-bus system with full-order generator and network models.