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This paper investigates the opportunity for energy saving in a 3-phase induction motor (IM) driving pump load and proposes an improved loss model control (LMC). Compared with other power loss reduction algorithms for IM, the presented one has the advantages of fast response, high accuracy, and simplicity of implementation. The performance of LMC depends mainly on the accuracy of modeling the motor...
This paper introduces a direct power control (DPC) method with narrowband disturbance rejection capability for the grid-connected doubly fed induction generator (DFIG). The method is suited for variable speed operation of DFIG, especially in wind energy conversion systems connected to weak networks where voltage unbalance is common. The control framework is based on the linear quadratic regulator...
The concept of stator flux orientation control of induction motor (IM) based on the optimal regulator theory has been introduced in the literature. In this paper, the idea is expanded to improve the performance at low speeds by proposing programmable low-pass filter (LPF) for flux vector synthesis. The developed control structure provides high-quality signal for the stator frequency. This signal is...
This paper introduces a new approach to the stator field oriented control of the induction motor (IM) drives. The scheme is based on the linear quadratic regulator (LQR) theory with preview. A state model suitable for voltage control is derived in the synchronous frame using vector method. An augmented error system is formulated to cure the adverse phenomena caused by modeling errors and disturbances...
In this paper we introduce a new discrete-time vector control scheme for the induction motor (IM) drives. The scheme is based on the optimal control theory with preview. The control system achieves rotor speed control and stator field orientation control via an optimized voltage command. The synthesized controller has good tracking capability and can cure the adverse phenomena caused by parameters...
This paper presents a novel discrete-time optimal state control for the 3-phase shunt active power filter (APF). The scheme utilizes a modified model for the converter derived in the synchronous reference frame. The model provides a means of controlling all the converter states by introducing an auxiliary input variable. The synthesized controller achieves simultaneous current control and regulation...
In this paper, we introduce a new controller that is adequate for the 3-phase PWM-VSC with small dc-link capacitor. The controller combines the benefits of the Pi-control and the feedforward compensation under the general framework of the optimal guaranteed cost control theory. Simulation studies are carried out to confirm the effectiveness of the proposed control strategy.
This paper proposes a novel model and new control scheme for the doubly fed induction generator (DFIG). The model describes the machine as two-input, two-output controlled object. The two output variables are the stator active and reactive powers while, the two input variables are the rotor voltage components. On the basis of derived model, a discrete-time robust optimal control is synthesized. The...
This paper introduces a new sensorless vector controlled induction motor (IM) drive. The closed loop control mechanism is based on the robust optimal control theory with preview. While, the rotor speed estimation is based on the model reference adaptive system (MRAS) approach. The control and estimation algorithms utilize the synchronous coordinates as a frame of reference. Experimental studies are...
This paper presents an improved direct torque control (DTC) scheme for the induction motor (IM) drives. The proposed method is based on the optimal preview control theory and utilizes a synthesized control model for the IM incorporating the electromagnetic torque as a state variable. The derived optimal preview controller achieves direct control over the machine flux and torque via an optimized stator...
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