observer is used to produce estimates of damper winding currents. The detailed derivation for the excitation control law has been provided. Globally exponentially stable of observer-based controller has been proven by applying Lyapunov stability theory. Simulation results have confirmed that the observer-based nonlinear controller can effectively improve the transient stability and voltage regulation under small disturbance and large sudden fault. The combined sliding mode observer-controller scheme demonstrates consistent superiority opposed to a system with linear controllers. It can be seen from the simulation study that the designed controller possesses a great robustness to deal with parameter uncertainties. Appendix A Appendix B Table 1 Parameters of the Power Synchronous Generator in p.u. Parameter Rs , stator resistance. 3 10-3 Rfd, field resistance. 6.3581 10-4 Rkd, direct damper winding resistance. 4.6454 10-3 Rkq, quadrature damper winding resistance. 6.8460 10-3 Ld, direct self-inductance. 1.116 Lq quadrature self-inductances. 0.416 Lfd, rotor self inductance. 1.083 Lkd, direct damper winding self inductance. 0.9568 Lkq, quadrature damper winding self inductance. 0.2321 Lmd, direct magnetizing inductance. 9.1763 10-1 Lmq, quadrature magnetizing inductance. 2.1763 10-1 V, infinite bus voltage 1 D, damping constant. 0 H, inertia constant. 3.195s Table 2 Parameters of the Transmission Line in p.u. Parameter Value Le, inductance of the transmission line. 11.16 10-3 Re, resistance of the transmission line. 60 10-3 References Y. Guo, D. J. Hill, and Y. Wang, Transient Stabilility and Voltage Regulation for “Global Power Systems”, Vol. 16, N°4, 2001, pp. 678-688. IEEE Trans on. Power Systems, C Zhu, R. Zhou, and Y. Wang, new nonlinear voltage controller for power systems”, “A Vol. 19, N°1, 1996, pp. International journal of Electrical power and Energy Systems, 19-27. P. Kundur, system stability and control”, MacGraw-Hill, 1994. “Power
observer is used to produce estimates of damper winding currents. The detailed derivation for the excitation control law has been provided. Globally exponentially stable of observer-based controller has been proven by applying Lyapunov stability theory. Simulation results have confirmed that the observer-based nonlinear controller can effectively improve the transient stability and voltage regulation under small disturbance and large sudden fault. The combined sliding mode observer-controller scheme demonstrates consistent superiority opposed to a system with linear controllers. It can be seen from the simulation study that the designed controller possesses a great robustness to deal with parameter uncertainties. Appendix A Appendix B Table 1 Parameters of the Power Synchronous Generator in p.u. Parameter Rs , stator resistance. Rfd, field resistance. Rkd, direct damper winding resistance. Rkq, quadrature damper winding resistance. Ld, direct self-inductance. Lq quadrature self-inductances. Lfd, rotor self inductance. Lkd, direct damper winding self inductance. Lkq, quadrature damper winding self inductance. Lmd, direct magnetizing inductance. Lmq, quadrature magnetizing inductance. V, infinite bus voltage D, damping constant. H, inertia constant. 3 10-3 6.3581 10-4 4.6454 10-3 6.8460 10-3 1.116 0.416 1.083 0.9568 0.2321 9.1763 10-1 2.1763 10-1 1 0 3.195s Table 2 Parameters of the Transmission Line in p.u. Parameter Value Le, inductance of the transmission line. Re, resistance of the transmission line. 11.16 10-3 60 10-3 References Y. Guo, D. J. Hill, and Y. Wang, “Global Transient Stabilility and Voltage Regulation for Power Systems”, IEEE Trans on. Power Systems, Vol. 16, N°4, 2001, pp. 678-688. C Zhu, R. Zhou, and Y. Wang, “A new nonlinear voltage controller for power systems”, International journal of Electrical power and Energy Systems, Vol. 19, N°1, 1996, pp. 19-27. P. Kundur, “Power system stability and control”, MacGraw-Hill, 1994.
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