Extended Kalman Filter–Linear Quadratic Regulator-Based Current Control for Dynamic Response Improvement and Robustness Enhancement of Grid-Forming Inverters
This paper proposes an EKF–LQR-based current controller to improve the performance and robustness of the current control loop in grid-forming inverters (GFMIs). Since load variations, power-reference changes, and grid-condition variations affect the dynamic characteristics of the output current in GFMIs, fast and stable control performance of the current control loop is required. However, conventional fixed-gain current controllers may cause response delay, overcurrent, and oscillations under variations in grid impedance, short-circuit ratio (SCR), and operating conditions. Therefore, this paper combines EKF-based current-state estimation with LQR-based optimal state-feedback control to improve the dynamic performance and robustness of the current control loop. The effectiveness of the proposed EKF–LQR-based current controller is validated through MATLAB/Simulink simulations and hardware-in-the-loop simulation (HILS) experiments under various operating and grid conditions.
The present paper proposes a robust continuous-time model predictive control (CTMPC) strategy for enhancing the performance of grid-connected photovoltaic (PV) systems operating under uncertainties and varying environmental conditions. The primary contribution of this work lies in the integration of a nonlinear extende...
Sanae El Bouassi, E. Mellouli, Z. Chalh· Engineering Research Express· 0 citations
Three-phase active front-end (AFE) rectifiers are widely deployed in motor drives, electric vehicle chargers, and grid-connected renewable energy systems, where precise DC-link voltage regulation is essential for stable converter operation. In practice, DC-link capacitance degrades over time, and load profiles vary dyn...
A. Razak, Norjulia Mohamad Nordin, Razman Ayop et al.· International Journal of Pow...· 0 citations
Nonlinear and asymmetrical loads in microgrids cause severe current distortion and phase unbalance, presenting critical challenges for grid-connected energy storage inverters. Conventional dq-frame Linear Active Disturbance Rejection Control (LADRC) suffers from two key limitations: bandwidth coupling between the obser...
Jin-Hao Shen, Hua Zhang, Xueneng Su et al.· Applied Sciences· 0 citations
This paper investigates a high-performance robust control for linear induction motor (LIM) drives based on the combination of the Crow Search Algorithm (CSA) and a Nonlinear Disturbance Observer (NDO) within the Field-Oriented Control (FOC) framework. The dynamic behavior of LIMs is strongly affected by longitudinal en...
M. Rezoug, Abdeslam Benmakhlouf, Laid Khettache et al.· Archives of Control Sciences· 0 citations
This paper presents a hierarchical estimator-assisted control architecture for a three-phase shunt active power filter (SAPF) for industrial power-quality improvement. The framework combines grid synchronization, harmonic-reference generation, cascaded DC-link and dq-current control, adaptive state–parameter estimation...
M. Gaiceanu, George-Andrei Marin, S. Epure et al.· Energies· 0 citations
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