This study proposes a gain-scheduled linear parameter-varying (LPV) control strategy for rotor speed regulation of a permanent magnet synchronous generator (PMSG) in wind turbine conversion systems (WTCS). The nonlinear electromechanical dynamics are reformulated into a speed-dependent LPV model over the operating region. To support reference generation without direct aerodynamic torque measurement, a first-order aerodynamic torque observer is introduced. Based on a set of local linear quadratic regulators designed at selected operating points, a smooth gain-scheduling law is constructed through a neural-network-based convex interpolation mechanism. The resulting controller preserves continuity across operating conditions and improves dynamic response compared with a conventional PI-PI strategy. Closed-loop stability is discussed using a common Lyapunov theory for the local closed-loop models, and simulation studies under nominal and parameter-perturbed conditions are carried out to evaluate the proposed method. The simulation results indicate that the proposed strategy can provide satisfactory performance.
A. T. Nguyen, Q. T. T. Nguyen, L. Tran et al.· 2026 11th International Conf...· 0 citations
This paper presents a power control strategy for a grid-connected three-level neutral-point-clamped inverter. The proposed approach integrates Model Predictive Control (MPC) with a modified Space Vector Modulation (SVM) scheme. The control structure comprises an inner current control loop and an outer DC-link voltage control loop to regulate both active and reactive power. To address the neutral-point voltage imbalance issue, a modified SVM method is developed by adaptively adjusting the dwell times of voltage vectors. This approach effectively balances the capacitor voltages, mitigates voltage fluctuations, and reduces current harmonic distortion. Simulation results in Matlab/Simulink verify that the active and reactive powers accurately track their reference values, achieving minimal steady-state error and fast dynamic response. In addition, the DC-link voltage remains stable, and the capacitor voltages are well balanced even under the application of medium voltage vectors. Furthermore, compared with the conventional finite control set MPC (FCS-MPC), the proposed method achieves superior performance in terms of lower total harmonic distortion of the grid current, owing to its fixed switching frequency, as well as reduced neutral-point voltage ripple.
Quang Huy Nguyen, A. T. Nguyen, Van Vi Nguyen et al.· E3S Web of Conferences· 0 citations
