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This paper presents a robust deadbeat predictive power control (DBPC) for PWM rectifiers with consideration of parameter mismatches. To achieve accurate power control with crude estimations of the grid-side impedance, the system disturbance caused by inaccurate parameter is analyzed. Then, a complex power based sliding-mode disturbance observer (SMDO) is proposed. Both DBPC and SMDO are implemented...
The control of PWM rectifiers under unbalanced network has become an important issue in recent years, especially in the applications with weak grid. Conventional methods is based on voltage oriented control (VOC), which requires several PI controllers in dual reference frame and the sequence extraction of grid/rectifier voltages and currents. To reduce the control complexity, recently direct power...
Model predictive direct power control (MPDPC) has been widely concerned in the control of doubly fed induction generator (DFIG) systems owing to its simple concept and good multivariate control ability. The optimal voltage vector is selected based on the principle of power error minimization. Nevertheless, the conventional MPDPC still presents relatively high power ripples and the switching frequency...
Conventional table-based direct power control (DPC) achieves quick dynamic response with very simple structure, which has been widely studied for power control of doubly fed induction generator (DFIG) system. However, DPC presents high steady power ripples and rich current harmonics with variable switching frequency. Furthermore, it would produce highly distorted stator current and power oscillations...
Model predictive torque control (MPTC) is a kind of powerful control scheme for high performance control of induction motor (IM) drives, which provides very quick dynamic response. However, MPTC suffers from tedious and time-consuming tuning work for the weighting factors, which is an obstacle for its application, especially in the multilevel converters. To solve this problem, this paper proposes...
Recently, model predictive torque control (MPTC) has been introduced as a powerful control method for induction motor (IM) drives. However, the weighting factor for stator flux must be tuned carefully to obtain satisfactory performance at different operation points. Unfortunately, so far the tuning of weighting factor in MPTC is mostly based on empirical procedure. This paper solves this problem by...
An improved T-model equivalent circuit of a single-sided linear induction machine (SLIM) is proposed. The analysis utilizes a set of one-dimensional air gap flux linkage equations. The model takes longitudinal end and transversal edge effects into consideration. These have to account for primary terminal half-filled slots, secondary back-iron saturation and skin effect in the secondary conducting...
Single-sided linear induction motors (SLIMs) have lately been applied in transportation system traction drives, particularly in the intermediate speed range. This is because they have merits, such as the ability to exert thrust on the secondary without mechanical contact, high acceleration or deceleration, less wheel wear, small turning circle radius, and flexible road line. The theory of operation...
The train propelled by a single-sided linear induction motor (SLIM) has been paid much attention recently by both academia and industry. The SLIM drive has advantages such as the direct thrust without the need of friction between wheel and railway track, small cross-sectional area, lack of gear box, and flexible line choice thanks to the greater climbing capability and smaller turning circle compared...
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