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This paper proposes a model predictive torque-vector control (MPTVC) scheme for four-switch three-phase inverter (FSTPI)-fed permanent magnet synchronous motor (PMSM). A cost function consist of a new constructed reference torque-vector is designed. Thus, the control of the FSTPI-fed motor drive with the capacitor voltages dc offset suppression can be ensured by only tracking the reference torque-vector...
This paper proposes a simplified model predictive control (MPC) for open-winding permanent magnet synchronous motor (OW-PMSM) system with two isolated power sources. According to the relationship between the torque and flux in PMSM, the two control constraints, torque and flux, in conventional MPC are converted into an equivalent flux vector, which eliminates the weighting factor in the cost function...
Permanent Magnet Synchronous Motors (PMSMs) operating among wide speed range needs optimal flux-weakening method to reach to higher speed level. For motors whose critical point locates within the current limit circle, two different flux-weakening algorithms are discussed comparatively in this paper. One is the traditional feedback flux-weakening control strategy, the other is a revised feedback flux-weakening...
This paper proposes a modified harmonic currents injection strategy for permanent magnet synchronous motors (PMSMs) with open winding topology to suppress torque ripples considering magnetic saturation. Harmonic current injection strategy is commonly used to reduce torque ripples generated by interaction between non-sinusoidal flux linkage and sinusoidal current. However, the influence of magnetic...
In this paper, a dead-beat direct torque and flux control with a novel sliding-mode stator flux observer is proposed for electric vehicle (EV) drives. Compared to the direct torque control, the proposed scheme exhibits both static and dynamic performances. Since the system parameters have impact on the control effect of the permanent magnet synchronous motor (PMSM) deadbeat-direct torque control (DB-DTC)...
Cogging torque may causes torque oscillation and noise while motors running, which affects their performance indexes. Aiming at this problem and comparing with several common cogging torque reducing methods, the feasibility of reducing cogging torque with pole width modulation method was pointed out. The cogging torques of surface- mounted permanent magnet motor and pole width modulation permanent...
To improve the performance of an open winding interior permanent magnet synchronous motor (IPMSM) drive system, a space vector modulation based direct torque control (SVM DTC) strategy combined with Maximum Torque per Ampere (MTPA) concept is proposed in this paper. The MTPA trajectories are analyzed in rotor voltage frame, and then combined with SVM DTC in torque flux linkage frame. An imaginary...
To compensate the voltage imbalance of the two split dc-link capacitors in a four-switch three-phase inverter fed direct torque control system, a modified space vector modulation (SVM) approach is proposed in this paper. The theory, design, and implementation of the modified SVM based DTC are discussed in detail, a new sector division method based on the real basic voltage vectors is introduced and...
This paper presents a modified direct power control (DPC) strategy for a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid-voltage conditions. The strategy is based on the investigation of the mathematic model and the composition of the instantaneous active and reactive power outputted by DFIG. It is found that, by applying a notch filter of two times of...
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