Improved Deadbeat Predictive Current Control of Permanent Magnet Synchronous Motor Using a Novel Stator Current and Disturbance Observer

Abstract

Thanks to the merits of superior dynamic response capability and current tracking performance, the deadbeat predictive current control (DPCC) has become a research hotspot for the permanent magnet synchronous motor (PMSM) drive system. However, DPCC is a model parameter sensitive control method. If there is a motor parameter mismatch, the performance of the DPCC drive system in terms of expected voltage vector, current harmonics, and torque ripple would be influenced. In this paper, firstly, a novel power sliding mode reaching law is proposed, which shortens the convergence time of the system state no matter what the initial state is. Then, an improved non-homogeneous disturbance observer (NHDO) with the proposed power sliding mode reaching law is established, which guarantees d-q axis current errors converge to zero when the PMSM drive system suffers uncertain disturbances, such as motor parameter mismatch. Finally, an improved DPCC using the novel stator current and disturbance observer which includes the proposed power sliding mode reaching law and NHDO is established, hence the accuracy of the predicted current increases significantly and voltage vectors can be compensated immediately once disturbances occur. Both simulation and platform experiments verify that the improved DPCC can maintain the current tracking performance with lower current ripples compared with the traditional DPCC when the major motor parameters mismatch. The proposed novel stator current and disturbance observer may also be capable of enhancing the PMSM's drive performance under other control strategies.

Dual Model Predictive Control Strategy of Direct‐Drive PMSM Based on Sliding Mode Disturbance Observer

“…Several methods have been proposed to compensate for the steady‐state error in the current and to improve the performance of DPCC. In [14], an improved DPCC including power sliding mode reaching law and a non‐homogeneous disturbance observer (NHDO) and with a novel stator current was built. In Ref.…”

Three‐vector model‐free predictive control for permanent magnet synchronous motor

“…Model predictive control (MPC) has advantages such as good control effect and high current tracking accuracy, and is widely used in the field of motor control [3, 4]. MPC can be divided into Continuous Control Set Model Predictive Control (CCS‐MPC) [5, 6] and Finite Control Set Model Predictive Control (FCS‐MPC) [7, 8]. Although CCS‐MPC has better robustness when parameters change, it has drawbacks such as high computational complexity and slow response [7].…”

Simulation Research on Deadbeat Direct Torque and Flux Control of Permanent Magnet Synchronous Motor

“…Although the PMSM has these advantages, it is a multivariable, strongly coupled, nonlinear control system, which tends to have a large torque ripple and requires certain control algorithms to obtain better control performance [5,6]. High-performance control of the PMSM can be broadly classified as field-oriented control [7,8], direct torque control (DTC), and predictive control [9][10][11][12]. The deadbeat-direct torque and flux control (DB-DTFC) studied in this paper is based on the extension of direct torque control.…”