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Robust nonlinear controller for power system transient stability enhancement with voltage regulation

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4 Author(s)
Guo, G. ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore ; Wang, Y. ; Lim, K.Y. ; Gao, L.

A new robust nonlinear controller that has the ability to enhance the transient stability and achieve voltage regulation simultaneously via excitation control for power systems is proposed. The structure of the controller is to add a proportional plus integral (PI) type voltage servo-compensator to the existing direct feedback linearisation (DFL) controller; a design procedure is proposed to guarantee the stability of the closed loop system in a possible working region. By using this robust nonlinear controller, direct measurement of the power angle for stabilising feedback control and calculation of the target power angle for voltage regulation are not necessary when employing the feedback linearisation technique. Performance analysis and simulation on a single-machine infinite-bus power system show that the proposed controller can retain the characteristic of the DFL controller and thus can enhance the transient stability as well as achieve voltage regulation of the power system

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Generation, Transmission and Distribution, IEE Proceedings-  (Volume:143 ,  Issue: 5 )