Passivity-based nonlinear hybrid control of ASVG based on Euler-Lagrangian model

Control method is an important factor influencing the compensation performance of ASVG (Advanced Static Var Generator). The traditional PI (Proportional-Integral) controller has simple control structure and easy parameter design, but poor dynamic control stability. To improve its dynamic stability, E-L (Euler-Lagrange) system is used to represent the mathematical model of ASVG and PBC (Passivity-Based Control) is adopted in its controller design, which guarantees Lyapunov function dynamic stability of ASVG. As the DC capacitor voltage and AC bus-bar voltage fluctuate greatly when disturbances occur in ASVG system, the PBC-based hybrid ASVG controller is proposed: inner current-loop PBC and dual outer voltage-loop PI control, which effectively enhances the dynamic stability of system with big disturbances and controls the DC capacitor voltage and AC bus-bar voltage within allowable range. Matlab simulation of single-machine infinite-bus system with ASVG shows the correctness of control system model and the effectiveness of designed controller. This project is supported by the Key Project of Chinese Ministry of Education (104117).