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DC/DC converters have been tremendously utilized nowadays. In some special applications such as military, aerospace, and precision instrumentation, the output voltage ripple of DC/DC converters has to be maintained in an acceptable level to achieve superior performance. For example, DC/DC converters are tied with inverter for adjustable speed motor controls or renewable energy interface with utility...
Modeling, simulation and implementation of Voltage Source Inverter (VSI) fed closed loop control of 3-phase induction motor drive is presented in this paper. A mathematical model of the drive system is developed and is used for the simulation study. Simulation is carried out using Scilab/Scicos, which is free and open source software. The above said drive system is implemented in laboratory using...
Dual stator-winding induction generator scheme based on excitation converter has been proposed for new-style integrating power system as tank. The dynamic model of dual stator-winding induction generator system with a diode bridge rectifier in the stationary reference frame is setup. The simulations of dynamic performances based on stator voltage oriented of control winding with variable speed under...
The windup phenomenon caused by the current limitation and PWM voltage regulation in the brushless DC motor (BLDCM) double PI loop speed regulating system has been investigated. And the anti-windup controller has been applied to suppress the relevant windup phenomenon. The simulation illustrates that the anti-windup controller make the BLDCM speed regulating less overshoot and quickly dynamic response...
This paper analyzes the Direct Torque Control (DTC) theory. We find that dynamical and stable performance are not hold with traditional voltage switch strategy at the same time. It presents a new direct torque control method of brushless DC motor, and introduces a space voltage vector selection table. By the addition of zero vector in the converter control, traditional three order torque control loop...
In this paper two sliding mode control alternatives to regulate the stator voltage amplitude for a stand alone wound rotor synchronous generator are presented. Both controllers use the stator voltage d-component error in the sliding surface. In a first case an outer PI loop controller is added to provide the proper d-voltage component reference. The second approach consists in extending the dynamic...
A new energy-saving scheme of voltage-regulation control for induction motors at periodically varying loads with almost constant speed is presented in this paper. The energy-saving principle, control strategies, triggering mode of SCRs are studied. Based on the analysis of the current oscillation in the voltage-regulation by 3-phase thyristors with the synchronous voltage signal, the solution to current...
In this paper a sliding mode controller for the stator voltage amplitude of a stand-alone wound rotor synchronous generator is presented. The standard dq-model of the electrical machine connected to an isolated inductive load is obtained. Then, a control law is designed in the framework of sliding mode control. The controller introduces a dynamic extension so that the stator amplitude relative degree...
In this paper, we present a variable speed wind induction generator associated to a flywheel energy storage system. Direct torque control strategy for an induction generator used in the flywheel energy storage system, is applied. Both rotor flux and DC bus voltage are regulated by the applied of the standard switching table for an operation in the 4 quadrants. This system is used for improving the...
This paper presents a predictive optimal matrix converter controller for a flywheel energy storage system used as dynamic voltage restorer (DVR). The flywheel energy storage device is based on a steel seamless tube mounted as a vertical axis flywheel to store kinetic energy. The motor/generator is a permanent magnet synchronous machine driven by the AC-AC matrix converter. The matrix control method...
The new-style dual stator-winding induction generator (DWIG) is presented in the field of wind power supply. The performances of the system operating with 1:2.5 speed range with wind power supply under no-load and rating-load are simulated. The designs of excited winding circuit are presented. The results show the good voltage performances and the large output power can be controlled.
The purpose of this research is to optimize control and enhance performance for a variable speed constant frequency (VSCF) doubly-fed induction generator (DFIG) wind turbine generation system by using fuzzy logic controller. The control of the rotor-side converter is realized by stator flux oriented control and the fuzzy controller performs robust speed control. The control of the grid-side converter...
Direct torque control (DTC) has the characters such as combined simplicity and robustness with excellent performance of torque control for the drive system. A DTC technique for drive system fed on three-level inverter and induction motor is presented, which means to select and compose right voltage vectors varying from speed working inconstant torque area . The mathematic and simulation models of...
Based on the mathematical model of the current source inverter (CSI) in the stationary alphabeta frame, this paper proposes advanced stationary frame voltage control methods for CSI with linear and nonlinear loads to achieve zero steady-state error respectively. The voltage control strategy based on a special resonant controller for CSI with linear loads is firstly analyzed in detail, on the basis...
This paper gives an overview about motion control of induction motor and also presents the simulation and experiment of induction motor controller using method of voltage/frequency control. In this paper, the voltage/frequency (V/Hz) control principle is used to the speed controller for 3-phase AC induction motor. The DSP (TMS320F2812) controller is used to read the stator flux of motor (the AC machine...
Operating single phase induction motors across a wide range of speed and load with high efficiency is still of interest. In the paper at hand the suitability of several different capacitor run single phase induction machines for phase control, integral (half) cycle control or integral switched cycle control is investigated. The induction machine's model's electrical and mechanical parameters are estimated...
This paper aims to achieve the AC output voltage control of the Z-source inverter using space vector pulse width modulation (SVPWM). A novel switching pattern in the SVPWM is used in order to boost easily the capacitor voltage by controlling a shoot-through time. The possible operating region for obtaining the desired AC output voltage to DC input voltage is analyzed. A novel modified SVPWM technique...
According to high power factor and accurate outputs DC voltage which are requirements of three-phase rectifier control as known, the research establishment of one outer voltage loop and two inner current loops as double-loop control system. The outer voltage loop could resist disturbance to achieve accurate output; the inner current loop based on space vector control to achieve high power factor....
This paper proposes a scheme for sensorless control of a brushless dc (BLDC) motor by direct back EMF detection method using dsPIC30F3010. A mathematical model of the drive system is simulated with MATLAB SIMULINK Toolbox and the reference design incorporates both hardware and software parts of the system. The simulated and experimental results from a prototype BLDC drive system are verified. Experimental...
This paper describes realization of a fast current control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC). This current controller directly selects one of the switching modes of a PWM inverter, while conventional one generates voltage reference regarding an inverter as ideal amplifier. The problem with selecting the switching mode to output is formulated...
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