This paper presents a unified comparative benchmark of four model-based sensorless speed-estimation algorithms for permanent magnet synchronous motor drives: Luenberger observer (LO), sliding-mode observer (SMO), model reference adaptive system (MRAS), and extended Kalman filter (EKF). The four estimators are implemented under the same PMSM model, operating profile, and simulation conditions. Their performance is evaluated using speed RMSE, position RMSE, steady-state error, maximum transient error, dq-axis current response, THD, disturbance rejection, and implementation complexity. The results show that the EKF achieves the highest estimation accuracy, whereas the SMO provides strong disturbance robustness. The LO and MRAS offer simpler implementation and lower computational cost, although MRAS exhibits larger transient errors. The comparative findings provide practical guidelines for selecting sensorless estimators according to the required trade-off among accuracy, robustness, harmonic behavior, and implementation cost.
Phan Nguyen Thanh Van, N. Tuan, H. Phi 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