Voltage Regulation of SEIG Based on Disturbance Observer-Lyapunov Direct Method

Abstract

To deal with the voltage drop of self-excited induction generator when the loads are fed, a static synchronous compensator (STATCOM) are used to improve the load capacity of the SEIG and the power quality. Therefore, this paper proposes a Lyapunov-based control based on a disturbance observer, which constructs a Lyapunov function from the mathematical model and transforms the error-tracking problem into solving the inner-loop control law. The control law satisfies the Lyapunov asymptotic stability. To eliminate the impact of model mismatch on the control strategy, a disturbance observer is incorporated into the current inner loop, improving the robustness of inner-loop. The results demonstrate that the proposed method can reduce the sensitivity to line parameters, enhance inner-loop robustness, and outperform traditional methods in response speed. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.