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This work presents an implementation of a control algorithm for DC motors using a technology that is gaining popularity, known as Field Programmable Analog Array (FPAA). The mathematical model of the DC motor and control are scaled to adjust the permitted voltages for the FPAA. Simulations of the implementation of the control algorithm with analog circuits are carried out where the good performance...
The study of sensorless control for permanent magnet synchronous machines (PMSM) has progressed rapidly over the past decade. This is contributed to the increased reliability and reduced cost obtained by removal of the traditional mechanical feedback devices that were needed to accurately report rotor position in applications requiring a Field Oriented Control (FOC) scheme. In these type applications,...
Precise speed control of an Interior Permanent Magnet Synchronous Motor (IPMSM) drive becomes a complex issue due to complex coupling among its winding currents and the rotor speed as well as the nonlinear nature of the developed torque. The system nonlinearity becomes severe when the IPMSM drive operates in the field weakening region. The main purpose of this paper is to present the implementation...
This paper presents an application of fuzzy controllers for improving the rapid response of wind energy captured. Because of the stochastic wind speed and uncertainty of wind power, one set of PID parameters can hardly achieve satisfactory control performance of the wind generator speed. We analyzed the relationship among the parameters of wind power generation system, and a mathematical model of...
An isolated Zeta converter is proposed as a power factor correction (PFC) converter with DC link voltage control for speed control of a permanent magnet brushless DC motor (PMBLDCM). The voltage source inverter (VSI) is used as an electronic commutator of PMBLDCM. The proposed converter performs the PFC action and DC link voltage control in single stage using only one controller. The current multiplier...
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...
This paper describes a new hybrid speed regulating method based on improved Fuzzy-PID, which is used in the speed loop for speed and current closed loop control direct current (DC) motor control system. The specific way of the hybrid method depends on the value of the error between reference speed and actual speed when it is bigger than threshold value, the fuzzy control is used, when it reduces to...
This paper presents a novel Adaptive Neural Fuzzy Inference System (ANFIS) based Matrix Converter for speed control of Induction Motor. The proposed ANFIS consists of fuzzy logic controller algorithm with a five layer Artificial Neural Network. The ANFIS system tunes the fuzzy system with hybrid learning algorithm and hence generates the reference voltage. The reference voltage is used to generate...
This paper aims at a power factor corrected (PFC) buck bridge DC-DC converter for a permanent magnet brushless DC motor (PMBLDCM) for an air conditioner. This PFC converter is fed from a single-phase AC mains through a diode bridge rectifier (DBR) and connected to a voltage source inverter (VSI) feeding the PMBLDCM. The Speed of the proposed PMBLDCM drive is controlled to improve efficiency of the...
Described the surface-mount permaent magnet synchronous motor used in electric vehicles operation principle, introduce the current limit trajectory and the voltage limit trajectory based on its mathematical model, Flux-weakening control extends the speed range of the machine effectively. Conventional flux-weakening speed control above the rate speed, the q-axis current and d-axis current coupling...
A traction power supply system which adopted separately excited DC generator sets was designed. The desired output voltage was kept constant by regulating the rotary speed of induction motor and field current. In order to realize almost ripple-free operation in the entire speed range and achieve the position sensorless control, direct torque control based on space-vector modulation (DTCSVM) strategy...
We are considering the problem of controlling synchronous motors driven through AC/DC rectifiers and DC/AC inverters. The control objectives are threefold: (i) forcing the motor speed to track a reference signal, (ii) regulating the DC link voltage, (iii) enforcing power factor correction (PFC) with respect to the power supply net. First, a nonlinear model of the whole controlled system is developed...
The wind turbines is often influenced by voltage disturbance because of voltage instability under the weakpower grids. This paper proposes a method for a variable speed constant frequency(VSCF) wind turbine with doubly-fed induction generator (DFIG) to stay connected to the grid during voltage disturbance. The keypoint of the method is to limit the inrush current in the rotor and the voltage in the...
The paper presents a new speed estimation method for the induction motor. The speed estimator is made possible by a special current control scheme that is based on Integral Sliding Mode (ISM). The traditional method for synchronous d-q current control is to use PI controllers along with a decoupling compensator. Synthesis of the compensation voltages requires knowledge of the speed and motor parameters...
This paper presents a mechanical speed-sensorless maximum power tracking controller for a wind energy conversion system composed of a wind turbine, a squirrel-cage induction generator and a matrix converter. The system is first represented by a comprehensive dynamic model developed by authors. Then, an algorithm-based controller is designed to derive the maximum power that can be achieved at a given...
This paper presents a control technique to maximize the output power of a wind turbine by adjusting the rotor speed. The control method is applied to a Doubly-fed induction generator (DFIG). The modeling of DFIG is performed using Matlab/Simulink. The wind speed is modeled based on Kaimal spectra. Since DFIG is a variable speed generator, the rotor speed can be regulated using the power electronics...
The flux estimating techniques currently used in the variable speed motor control are based on dynamic equations. It leads to the concern about the stable, fastness and error accumulation problems. In this paper, a new stator flux calculation method based on the multi-rate output sampling is proposed. By arranging the current sampling speed twice as fast as the control voltage updating speed, we can...
This paper presents the dynamic modeling, prediction, control and experimental aspects of a switched reluctance starter/generator (SRS/G) system. The proposed model utilizes the Fourier series in expression of current dependent arctangent function to characterize the relationship among phase current, rotor position, flux linkage and torque characteristics. Second, a simulation model along with their...
This paper presents an improved stator flux orientated (SFO) control strategy of induction motors. Based on coordinate transformation and stator flux orientation, a mathematical model of induction motor is derived. In this new system, the stator flux linkage is directly controlled by the d-axis component of stator voltage and in the speed control channel, the output of current controller is regarded...
The modern technique of direct torque control induction motor is modified in this paper. Machine analysis is emphasized directly on the 3-phase variables for motoring mode, so Park's transformation to generalized d-q axis theory is not used. Only stator current signal is functioning to evaluate fluxes and speed, so that no need to use any sensor. The 3-phase PPU inverter gate is excited by the control...
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