An adaptive sliding mode excitation controller design for synchronous generators

A hybrid excitation controller to enhance the transient stability of a single machine infinite bus (SMIB) system is proposed in this paper. An adaptive backstepping sliding mode control approach is employed to fifth-order dynamical model of a synchronous generator (SG) for obtaining the excitation control law. To show the robustness of the proposed control scheme, internal uncertainty and external perturbation are also included within the model. Thus, in this work, parameter variations are considered as unknown terms and these are estimated using an adaptation formula. A Lyapunov function is used to guarantee the overall stability of the power system. To verify the effectiveness of the proposed excitation controller under various contingencies, a simulation study is presented. To illustrate the supremacy of the proposed excitation controller, the performance is compared with an existing excitation controller and it confirms that the proposed controller outperforms the existing controller in terms of overshoot and settling time.