In this article, we are interested in the improvement of the performances of Doubly Fed Induction Machine (DFIM) operating in motor mode by the use of the direct torque control (DTC). Firstly, we focused on the modeling of the DFIM and the study of the principle of functioning of the DTC control. Then, we implement this control on the Matlab/Simulink environment. Secondly, we present the simulation results of the proposed control. The analysis of these results shows clearly that the system based on the DFIM studied follows perfectly the set points, what allowed us to justify the efficiency of the elaborate control.
Real time implementation of a super twisting control of a BLDC motorIJECEIAES
This paper presents and implements a Super-Twisting high order sliding mode control for a BLDC motor. Conventional sliding mode controller has a very fast response, it allows the convergence in finite time and characterized by its robustness against disturbances and uncertainties; However, the chattering phenomenon due to the discontinuous nature of its control organ degrades its performance, especially in case of mechanical membranes control. To overcome this disadvantage, the most commun solutions are based on the adaptation of its discontinuous nature at static regime, it reduces effectively the chattering phenomenon, but on the other hand impacts performance in terms of robustness. The Super-Twisting is an algorithm of high order sliding mode applicable on systems with relative degree 1, it produces a continuous control which cancels the chattering phenomenon and preserve all traditional sliding mode command performances. To validate the effectiveness and the robustness of the Super-Twisting controller for controlling brushless motors, experimental results using a 3KW BLDC motor are provided and compared with those of a conventional sliding mode controller.
Simulation and Analysis of Modified DTC of PMSMIJECEIAES
This research paper describes the simulation and analysis of the modified DTC for Surface mounted Permanent Magnet Synchronous Motor (SPMSM) using PI controller. Among all of the various drive systems,PMSM is widely used for accurate speed and torque control, with greater efficiency, superior torque to inertia and high power density.The Conventional DTC secheme widely used for this purpose but it is failed to achieve desirable performance of the system for which the modified DTC secheme is propsed.The modified DTC algorithm controls the voltage vectors, directly from a simple look up table depending on outcome of the torque and indirectly flux controllers.The overall drive system can be implemented in SIMULINK/MATLAB environment.The modified DTC is validated with loading conditions.The simulated results are focused on the speed, settling time at loaded conditions, torque and flux linkages ripple and THD in the phase current for modified DTC applied to SPMSM.
This document discusses modeling and field oriented control (FOC) of a permanent magnet synchronous motor (PMSM) using MATLAB/Simulink. It first introduces PMSM drives and their components. It then presents the mathematical modeling of a PMSM in the d-q reference frame. This includes developing the voltage and flux linkage equations. It also discusses Parks transformation and the equivalent circuit model. Next, it covers PMSM control strategies like FOC which allows controlling the motor like a DC motor. It provides the details of FOC implementation including constant torque control. Finally, it discusses establishing the FOC simulation model in MATLAB/Simulink to simulate the control system.
Self-Tuning Fuzzy Based PI Controller for DFIM Powered by Two Matrix ConvertersIJPEDS-IAES
This paper presents a study of the Doubly Fed Induction Machine (DFIM) powered by two matrix converters; one connected to the stator windings and the other connected to the rotor windings. First, the mathematical model of DFIM and those of the matrix converters are developed. Then, the vector control technique is applied to the DFIM. Fuzzy logic is used in order to automatically adjust the parameters of the PI controller. The performance of this structure under different operating conditions is studied. Particular interest is given to the robustness of the fuzzy logic based control. The operation of the DFIM under overload conditions is also examined. Simulation results obtained in MATLAB/Simulink environment are presented and discussed.
This document describes a direct torque control (DTC) scheme for an induction motor that uses a fuzzy logic controller (FLC) to reduce torque ripples. The DTC controls the motor torque and flux by selecting inverter voltage vectors. Typically this results in torque ripples. The FLC is designed to adaptively adjust the bandwidth of the torque hysteresis controller based on changes in motor torque and current over time. This helps minimize torque ripples and improve dynamic response. Simulation results using MATLAB/Simulink confirm that the FLC-based DTC scheme effectively controls the induction motor with reduced torque ripples compared to conventional DTC.
Nonlinear control of WECS based on PMSG for optimal power extraction IJECEIAES
This document presents a study that proposes an integral backstepping control strategy to optimize power extraction from a wind energy conversion system based on a permanent magnet synchronous generator. The control regulates the generator's rotational speed to track the optimal speed for maximum power point tracking. Simulation results show that the integral backstepping control achieves better performance than a conventional PI vector control in regulating speed during stochastic and step changes in wind speed, allowing for more effective maximum power point tracking.
In recent advancements in electric machine and drives, wound rotor motor is extensively used. The merit of using wound rotor induction motor is to control speed/torque characteristics by inserting external resistance. Wound rotor induction motor can be used in the cases such as (a) low inrush current, (b) load requiring high starting torque, (c) lower starting current is required, (d) loads having high inertia, and (e) gradual built up of torque. Examples include conveyers, cranes, pumps, elevators, and compressors. This paper includes speed control of wound induction motor using MATLAB/Simulink for rotor resistance and slip power recovery method. The characteristics of these speed control methods are hence analysed.
Real time implementation of a super twisting control of a BLDC motorIJECEIAES
This paper presents and implements a Super-Twisting high order sliding mode control for a BLDC motor. Conventional sliding mode controller has a very fast response, it allows the convergence in finite time and characterized by its robustness against disturbances and uncertainties; However, the chattering phenomenon due to the discontinuous nature of its control organ degrades its performance, especially in case of mechanical membranes control. To overcome this disadvantage, the most commun solutions are based on the adaptation of its discontinuous nature at static regime, it reduces effectively the chattering phenomenon, but on the other hand impacts performance in terms of robustness. The Super-Twisting is an algorithm of high order sliding mode applicable on systems with relative degree 1, it produces a continuous control which cancels the chattering phenomenon and preserve all traditional sliding mode command performances. To validate the effectiveness and the robustness of the Super-Twisting controller for controlling brushless motors, experimental results using a 3KW BLDC motor are provided and compared with those of a conventional sliding mode controller.
Simulation and Analysis of Modified DTC of PMSMIJECEIAES
This research paper describes the simulation and analysis of the modified DTC for Surface mounted Permanent Magnet Synchronous Motor (SPMSM) using PI controller. Among all of the various drive systems,PMSM is widely used for accurate speed and torque control, with greater efficiency, superior torque to inertia and high power density.The Conventional DTC secheme widely used for this purpose but it is failed to achieve desirable performance of the system for which the modified DTC secheme is propsed.The modified DTC algorithm controls the voltage vectors, directly from a simple look up table depending on outcome of the torque and indirectly flux controllers.The overall drive system can be implemented in SIMULINK/MATLAB environment.The modified DTC is validated with loading conditions.The simulated results are focused on the speed, settling time at loaded conditions, torque and flux linkages ripple and THD in the phase current for modified DTC applied to SPMSM.
This document discusses modeling and field oriented control (FOC) of a permanent magnet synchronous motor (PMSM) using MATLAB/Simulink. It first introduces PMSM drives and their components. It then presents the mathematical modeling of a PMSM in the d-q reference frame. This includes developing the voltage and flux linkage equations. It also discusses Parks transformation and the equivalent circuit model. Next, it covers PMSM control strategies like FOC which allows controlling the motor like a DC motor. It provides the details of FOC implementation including constant torque control. Finally, it discusses establishing the FOC simulation model in MATLAB/Simulink to simulate the control system.
Self-Tuning Fuzzy Based PI Controller for DFIM Powered by Two Matrix ConvertersIJPEDS-IAES
This paper presents a study of the Doubly Fed Induction Machine (DFIM) powered by two matrix converters; one connected to the stator windings and the other connected to the rotor windings. First, the mathematical model of DFIM and those of the matrix converters are developed. Then, the vector control technique is applied to the DFIM. Fuzzy logic is used in order to automatically adjust the parameters of the PI controller. The performance of this structure under different operating conditions is studied. Particular interest is given to the robustness of the fuzzy logic based control. The operation of the DFIM under overload conditions is also examined. Simulation results obtained in MATLAB/Simulink environment are presented and discussed.
This document describes a direct torque control (DTC) scheme for an induction motor that uses a fuzzy logic controller (FLC) to reduce torque ripples. The DTC controls the motor torque and flux by selecting inverter voltage vectors. Typically this results in torque ripples. The FLC is designed to adaptively adjust the bandwidth of the torque hysteresis controller based on changes in motor torque and current over time. This helps minimize torque ripples and improve dynamic response. Simulation results using MATLAB/Simulink confirm that the FLC-based DTC scheme effectively controls the induction motor with reduced torque ripples compared to conventional DTC.
Nonlinear control of WECS based on PMSG for optimal power extraction IJECEIAES
This document presents a study that proposes an integral backstepping control strategy to optimize power extraction from a wind energy conversion system based on a permanent magnet synchronous generator. The control regulates the generator's rotational speed to track the optimal speed for maximum power point tracking. Simulation results show that the integral backstepping control achieves better performance than a conventional PI vector control in regulating speed during stochastic and step changes in wind speed, allowing for more effective maximum power point tracking.
In recent advancements in electric machine and drives, wound rotor motor is extensively used. The merit of using wound rotor induction motor is to control speed/torque characteristics by inserting external resistance. Wound rotor induction motor can be used in the cases such as (a) low inrush current, (b) load requiring high starting torque, (c) lower starting current is required, (d) loads having high inertia, and (e) gradual built up of torque. Examples include conveyers, cranes, pumps, elevators, and compressors. This paper includes speed control of wound induction motor using MATLAB/Simulink for rotor resistance and slip power recovery method. The characteristics of these speed control methods are hence analysed.
1) The document discusses using a sliding mode controller for speed control of a two phase induction motor.
2) Sliding mode control is an efficient technique for speed control due to its robustness and insensitivity to parameter variations.
3) A sliding mode controller is designed for the speed control of a two phase induction motor. The controller design involves choosing a sliding surface, establishing convergence conditions, and determining the control law. Chattering reduction is also addressed.
Speed Control System of Induction Motor by using Direct Torque Control Method...ijtsrd
Escalator is useful and act in the important part to carry passengers to the targeted floors of building. Every escalator must be driven by its own motor and this motor speed must be controled. To drive escalator with a constant speed, direct torque control technique is used to drive three phase squirrel cage induction motor. In this paper, the development of speed control system for three phase squirrel cage induction motor using a direct torque control method is presented and simulation for proposed system is done with the help of MATLAB SIMULINK. Soe Sandar Aung | Thet Naing Htun "Speed Control System of Induction Motor by using Direct Torque Control Method used in Escalator" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27903.pdfPaper URL: https://www.ijtsrd.com/engineering/electrical-engineering/27903/speed-control-system-of-induction-motor-by-using-direct-torque-control-method-used-in-escalator/soe-sandar-aung
Direct Torque Control of Four Switch Three Phase Inverter Fed Induction Motor...IAES-IJPEDS
This paper presents sensorless speed control of induction motor (IM) using four switch three phase inverter (FSTPI) with direct torque and flux control (DTFC). The proposed sensorless DTFC system consists of an adaptive observer of rotor flux to accurately estimate stator resistance and speed simultaneously, without affecting drive performances. The switching technique for DTFC of IM using FSTPI in low power application is based on the principle of similarity between FSTPI and SSTPI (six switch three phase inverter), where the αβ plan is divided into 6 sectors and the formation of the voltage space vector is done in the same way as for SSTPI by using effective (mean) vectors. This approach allows using the well-known established switching table of SSTPI for FSTPI. The simulation results indicates that the sensorless speed control of FSTPI fed IM with DTFC and adaptive observer provides accurate estimate, good trajectory tracking with different dynamics performance. The experimental results verify the effectiveness of the proposed method at different operating points.
This document presents a sliding mode control based maximum power point tracking (MPPT) method for solar PV systems. It discusses modeling of the PV system using a single diode model and the components of the system including the PV array, DC-DC boost converter, and sliding mode controller (SMC). The SMC algorithm tracks the maximum power point by adjusting the duty cycle of the boost converter based on a switching function defined as the slope of the PV characteristics. Simulation results in MATLAB/Simulink demonstrate the effectiveness of the SMC MPPT approach under varying irradiance conditions.
Fuzzy Adaptive Control for Direct Torque in Electric VehicleIAES-IJPEDS
This paper presents a technique to control the electric vehicle (EV) speed and torque at any curve. Our propulsion model consists of two permanent magnet synchronous (PMSM) motors. The fuzzy adaptive PI controller is used to adjust the different static error constants, as per the speed error. The suggested based on the direct torque fuzzy control (DTFC). A Mamdani type fuzzy direct torque controller is first developed and then rules are modified using stator current membership functions. The computations are ensured by the electronic differential, this driving process permit to steer each driving wheels at any curve separately.Modeling and simulation are carried out using the Matlab/Simulink tool to investigate the performance of the proposed system.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document summarizes a study that uses Takagi-Sugeno fuzzy logic control as a speed controller for indirect field oriented control of an induction motor drive. The study builds a simulation model of indirect field oriented control for an induction motor in MATLAB Simulink. Takagi-Sugeno fuzzy logic is then applied as the speed controller using error and derivative error as inputs and change of torque command as the output. Simulation results show zero overshoot, a rise time of 0.4 seconds, and a settling time of 0.4 seconds. The steady state error is 0.01% indicating the speed can accurately follow the reference speed. The fuzzy logic controller provides effective speed control for the induction motor drive.
Implementation of d space controlled dpwm basedeSAT Journals
Abstract The paper presents dSPACE controlled Induction motor drive fed through Discontinuous pulse width modulation (DPWM) algorithm based voltage source inverter. Two important performance measuring factors harmonic distortion in line current and dc bus utilization of the inverter can be improved with Discontinuous PWM approach in comparison with the popular conventional space vector (CSVPWM) approach; the paper contemplates on the implementation of DPWM algorithm for pulse generation which in turn are fed to intelligent power module that feeds the motor drive through DS1104 PPC603e / 250 MHz control desk. The results conclude the successful implementation of dSPACE Controlled induction motor drive. To validate the proposed work, numerical simulation including the experimental results is presented. Keywords:-DPWM, dSPACE, RTI
The researchers modified a neural electrode implantation instrument to improve control over insertion velocity and depth. They reversed the motor orientation to increase stroke distance and acceleration. Testing showed velocity increased with forward voltage and pulse width but decreased when opposing gravity. The instrument was successfully used to implant electrodes in primate and cadaver models with minimal tissue damage. Future work will integrate three-axis positioning control.
A NEW FUZZY LOGIC BASED SPACE VECTOR MODULATION APPROACH ON DIRECT TORQUE CON...csandit
The induction motors are indispensable motor types for industrial applications due to its wellknown
advantages. Therefore, many kind of control scheme are proposed for induction motors
over the past years and direct torque control has gained great importance inside of them due to
fast dynamic torque response behavior and simple control structure. This paper suggests a new
approach on the direct torque controlled induction motors, Fuzzy logic based space vector
modulation, to overcome disadvantages of conventional direct torque control like high torque
ripple. In the proposed approach, optimum switching states are calculated by fuzzy logic
controller and applied by space vector pulse width modulator to voltage source inverter. In
order to test and compare the proposed DTC scheme with conventional DTC scheme
simulations, in Matlab/Simulink, have been carried out in different speed and load conditions.
The simulation results showed that a significant improvement in the dynamic torque and speed
responses when compared to the conventional DTC scheme.
Parameter estimation of three-phase linear induction motor by a DSP-based el...IJECEIAES
This work describes a method to characterize a three-phase linear induction motor in order to determine the various parameters used in its per-phase equivalent circuit by a DSP-based electric-drives system. In LIM (Linear Induction Motor), the air gap is very large compared with the RIMs (Rotary Induction Motors). Further, the secondary part normally does not have slotted structure. It is just made of aluminum and steel plates. Therefore, the effective air gap is larger than the physical air gap. High air gap makes a larger leakage inductance. It leads to lower efficiency and lower power factor. DC resistance test will be done to determine the value of Rs. The primary Inductance Ls will be calculated by running the LIM at synchronous speed. The secondary parameters i.e. Llr and Rr′ will be calculated by blocked-mover test. The experiment for no load test is shown and include a DC motor coupled to the LIM under test. Two methods to calculate the secondary parameters are described.
DSP-Based Sensorless Speed Control of a Permanent Magnet Synchronous Motor us...IJPEDS-IAES
This document summarizes an experiment on sensorless speed control of a permanent magnet synchronous motor (PMSM) using a sliding mode current observer (SMCO). A SMCO was implemented to estimate the rotor position based on estimated back electromotive forces. The rotor speed was then calculated by differentiating the estimated rotor position. The control system was developed on a Texas Instruments TMS320LF2812 digital signal processor and tested on a Pittman 3441 series PMSM. Experimental results validated the real-time implementation and showed the effectiveness of the sensorless speed control approach using an SMCO.
Efficiency, reliability, high power quality and continuous operation are important aspects in electric vehicle attraction system. Therefore, quick fault detection, isolation and enhanced fault-tolerant control for open-switches faults in inverter driving systems become more and more required in this filed. However, fault detection and localization algorithms have been known to have many performance limitations due to speed variations such as wrong decision making of fault occurrence. Those weaknesses are investigated and solved in this paper using currents magnitudes fault indices, current direct component fault indices and a decision system. A simulation model and experimental setup are utilized to validate the proposed concept. Many simulation and experimental results are carried out to show the effectiveness of the proposed fault detection approach.
This document summarizes a research paper on sensorless direct torque control of interior permanent magnet synchronous motors for embedded systems using an MRAS observer. It begins with an introduction to embedded systems and IPMSMs. It then provides the mathematical model of an IPMSM and describes the principles of direct torque control, including flux and torque hysteresis controllers and the inverter switching table. It presents an MRAS observer as a sensorless closed-loop algorithm for estimating rotor speed and position. In the simulation results, the proposed sensorless DTC control method using an MRAS observer is effective for embedded system applications.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Improved Rotor Speed Brushless DC Motor Using Fuzzy Controllerijeei-iaes
This document describes research on improving the rotor speed of a brushless DC motor using a fuzzy controller. It begins with background on BLDC motors and their advantages over brushed DC motors. It then provides the mathematical model of a BLDC motor. Next, it discusses implementing a PID fuzzy controller for a BLDC motor in Simulink and the design procedure, which involves first designing a conventional PID controller, then a linear fuzzy PID controller with the same performance, and finally adjusting the fuzzy inference system to create a nonlinear fuzzy PID controller.
Stability Analysis of DC-link Voltage Control on Autonomous Micro Hydro Power...IAES-IJPEDS
Micro Hydro Power Plant has become one of the interesting topics to be researched nowadays. This paper deals with the stability analysis on control system of excitation voltage in Micro Hydro Power Plant. The control of this voltage can be achieved by controlling the Permanent Magnet Synchronous Machine (PMSM) with particular algorithm so the voltage on the DC-link part of the system can be controlled. Without knowing the exact specification of system parameters, the system will be most likely unstable. The DC-link control system is modeled, simulated, and mathematically analyzed so the parameter specification for the stable system can be obtained.
This paper presents a novel hybrid control of a BLDC motor using a mixed sliding mode and fuzzy logic controller. The objective is to build a fast and robust controller which overcome classical controllers’ inconveniences and exploit the fast response of brushless dc motors characterized by an intense torque and fast response time. First the paper study pros and cons of both sliding mode and fuzzy logic controllers. Then the novel controller and its stability demonstration are presented. Finally the proposed controller method is used for the speed control of a BLDC motor 3KW. The obtained results are compared with those of a fuzzy logic and a conventional sliding mode controller. It allows to show performance of the proposed controller in terms of speed response and reaction against disturbances, which is improved more than 5 times without losing stability or altering tracking accuracy
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
A PROJECT REPORT SIM & SPEED CONTROL OF INDUCTIO DRIVEPawan Kumar
The document discusses speed control methods for three-phase induction motors. It analyzes the transients during starting of an induction motor with different machine parameters. It then examines various speed control methods including variable rotor resistance, variable stator voltage, and constant V/f control. Simulation results are presented to show the torque-speed characteristics for each method. Vector control is also introduced, which allows independent control of torque and flux.
Improved Torque Control Performance in Direct Torque Control using Optimal Sw...IJPEDS-IAES
This paper presents the significant improvement of Direct Torque Control (DTC) of 3-phases induction machine using a Cascaded H- Bidge Multilevel Inverter (CHMI). The largest torque ripple and variable switching frequency are known as the major problem founded in DTC of induction motor. As a result, it can diminish the performance induction motor control. Therefore, the conventional 2- level inverter has been replaced with CHMI the in order to increase the performance of the motor either in dynamic or steady-state condition. By using the multilevel inverter, it can produce a more selection of the voltage vectors. Besides that, it can minimize the torque ripple output as well as increase the efficiency by reducing the switching frequency of the inverter. The simulation model of the proposed method has been developed and tested by using Matlab software. Its improvements were also verified via experimental results.
Enhanced Torque Control and Reduced Switching Frequency in Direct Torque Cont...IJPEDS-IAES
Direct Torque Control (DTC) of induction machine has received wide
acceptance in many adjustable speed drive applications due to its simplicity
and high performance torque control. However, the DTC using a common
two-level inverter poses two major problems such as higher switching
frequency (or power loss) and larger torque ripple. These problems are due to
inappropriate voltage vectors which are selected among a limited number of
voltage vectors available in two-level inverter. The proposed research aims to
formulate an optimal switching strategy using Dual-Inverter Supplied Drive
for high performances of DTC. By using dual-inverter supplied, it provides
greater number of voltage vectors which can offer more options to select the
most appropriate voltage vectors. The most appropriate voltage vectors
should able to produce minimum torque slope but sufficient to satisfy torque
demands. The identification is accomplished by using an equation of rate of
change of torque which is derived from the induction machine equations. The
proposed strategy also introduces a block of modification of torque error
status which is responsible to modify the status such that it can determine the
most optimal voltage vectors from a look-up table, according to motor
operating conditions. The improvements obtained are as follows; 1)
minimization of switching frequency (reduce power loss), and 2) reduction of
torque ripple. Some improvements obtained in the proposed strategy were
verified via experimentations.
1) The document discusses using a sliding mode controller for speed control of a two phase induction motor.
2) Sliding mode control is an efficient technique for speed control due to its robustness and insensitivity to parameter variations.
3) A sliding mode controller is designed for the speed control of a two phase induction motor. The controller design involves choosing a sliding surface, establishing convergence conditions, and determining the control law. Chattering reduction is also addressed.
Speed Control System of Induction Motor by using Direct Torque Control Method...ijtsrd
Escalator is useful and act in the important part to carry passengers to the targeted floors of building. Every escalator must be driven by its own motor and this motor speed must be controled. To drive escalator with a constant speed, direct torque control technique is used to drive three phase squirrel cage induction motor. In this paper, the development of speed control system for three phase squirrel cage induction motor using a direct torque control method is presented and simulation for proposed system is done with the help of MATLAB SIMULINK. Soe Sandar Aung | Thet Naing Htun "Speed Control System of Induction Motor by using Direct Torque Control Method used in Escalator" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27903.pdfPaper URL: https://www.ijtsrd.com/engineering/electrical-engineering/27903/speed-control-system-of-induction-motor-by-using-direct-torque-control-method-used-in-escalator/soe-sandar-aung
Direct Torque Control of Four Switch Three Phase Inverter Fed Induction Motor...IAES-IJPEDS
This paper presents sensorless speed control of induction motor (IM) using four switch three phase inverter (FSTPI) with direct torque and flux control (DTFC). The proposed sensorless DTFC system consists of an adaptive observer of rotor flux to accurately estimate stator resistance and speed simultaneously, without affecting drive performances. The switching technique for DTFC of IM using FSTPI in low power application is based on the principle of similarity between FSTPI and SSTPI (six switch three phase inverter), where the αβ plan is divided into 6 sectors and the formation of the voltage space vector is done in the same way as for SSTPI by using effective (mean) vectors. This approach allows using the well-known established switching table of SSTPI for FSTPI. The simulation results indicates that the sensorless speed control of FSTPI fed IM with DTFC and adaptive observer provides accurate estimate, good trajectory tracking with different dynamics performance. The experimental results verify the effectiveness of the proposed method at different operating points.
This document presents a sliding mode control based maximum power point tracking (MPPT) method for solar PV systems. It discusses modeling of the PV system using a single diode model and the components of the system including the PV array, DC-DC boost converter, and sliding mode controller (SMC). The SMC algorithm tracks the maximum power point by adjusting the duty cycle of the boost converter based on a switching function defined as the slope of the PV characteristics. Simulation results in MATLAB/Simulink demonstrate the effectiveness of the SMC MPPT approach under varying irradiance conditions.
Fuzzy Adaptive Control for Direct Torque in Electric VehicleIAES-IJPEDS
This paper presents a technique to control the electric vehicle (EV) speed and torque at any curve. Our propulsion model consists of two permanent magnet synchronous (PMSM) motors. The fuzzy adaptive PI controller is used to adjust the different static error constants, as per the speed error. The suggested based on the direct torque fuzzy control (DTFC). A Mamdani type fuzzy direct torque controller is first developed and then rules are modified using stator current membership functions. The computations are ensured by the electronic differential, this driving process permit to steer each driving wheels at any curve separately.Modeling and simulation are carried out using the Matlab/Simulink tool to investigate the performance of the proposed system.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document summarizes a study that uses Takagi-Sugeno fuzzy logic control as a speed controller for indirect field oriented control of an induction motor drive. The study builds a simulation model of indirect field oriented control for an induction motor in MATLAB Simulink. Takagi-Sugeno fuzzy logic is then applied as the speed controller using error and derivative error as inputs and change of torque command as the output. Simulation results show zero overshoot, a rise time of 0.4 seconds, and a settling time of 0.4 seconds. The steady state error is 0.01% indicating the speed can accurately follow the reference speed. The fuzzy logic controller provides effective speed control for the induction motor drive.
Implementation of d space controlled dpwm basedeSAT Journals
Abstract The paper presents dSPACE controlled Induction motor drive fed through Discontinuous pulse width modulation (DPWM) algorithm based voltage source inverter. Two important performance measuring factors harmonic distortion in line current and dc bus utilization of the inverter can be improved with Discontinuous PWM approach in comparison with the popular conventional space vector (CSVPWM) approach; the paper contemplates on the implementation of DPWM algorithm for pulse generation which in turn are fed to intelligent power module that feeds the motor drive through DS1104 PPC603e / 250 MHz control desk. The results conclude the successful implementation of dSPACE Controlled induction motor drive. To validate the proposed work, numerical simulation including the experimental results is presented. Keywords:-DPWM, dSPACE, RTI
The researchers modified a neural electrode implantation instrument to improve control over insertion velocity and depth. They reversed the motor orientation to increase stroke distance and acceleration. Testing showed velocity increased with forward voltage and pulse width but decreased when opposing gravity. The instrument was successfully used to implant electrodes in primate and cadaver models with minimal tissue damage. Future work will integrate three-axis positioning control.
A NEW FUZZY LOGIC BASED SPACE VECTOR MODULATION APPROACH ON DIRECT TORQUE CON...csandit
The induction motors are indispensable motor types for industrial applications due to its wellknown
advantages. Therefore, many kind of control scheme are proposed for induction motors
over the past years and direct torque control has gained great importance inside of them due to
fast dynamic torque response behavior and simple control structure. This paper suggests a new
approach on the direct torque controlled induction motors, Fuzzy logic based space vector
modulation, to overcome disadvantages of conventional direct torque control like high torque
ripple. In the proposed approach, optimum switching states are calculated by fuzzy logic
controller and applied by space vector pulse width modulator to voltage source inverter. In
order to test and compare the proposed DTC scheme with conventional DTC scheme
simulations, in Matlab/Simulink, have been carried out in different speed and load conditions.
The simulation results showed that a significant improvement in the dynamic torque and speed
responses when compared to the conventional DTC scheme.
Parameter estimation of three-phase linear induction motor by a DSP-based el...IJECEIAES
This work describes a method to characterize a three-phase linear induction motor in order to determine the various parameters used in its per-phase equivalent circuit by a DSP-based electric-drives system. In LIM (Linear Induction Motor), the air gap is very large compared with the RIMs (Rotary Induction Motors). Further, the secondary part normally does not have slotted structure. It is just made of aluminum and steel plates. Therefore, the effective air gap is larger than the physical air gap. High air gap makes a larger leakage inductance. It leads to lower efficiency and lower power factor. DC resistance test will be done to determine the value of Rs. The primary Inductance Ls will be calculated by running the LIM at synchronous speed. The secondary parameters i.e. Llr and Rr′ will be calculated by blocked-mover test. The experiment for no load test is shown and include a DC motor coupled to the LIM under test. Two methods to calculate the secondary parameters are described.
DSP-Based Sensorless Speed Control of a Permanent Magnet Synchronous Motor us...IJPEDS-IAES
This document summarizes an experiment on sensorless speed control of a permanent magnet synchronous motor (PMSM) using a sliding mode current observer (SMCO). A SMCO was implemented to estimate the rotor position based on estimated back electromotive forces. The rotor speed was then calculated by differentiating the estimated rotor position. The control system was developed on a Texas Instruments TMS320LF2812 digital signal processor and tested on a Pittman 3441 series PMSM. Experimental results validated the real-time implementation and showed the effectiveness of the sensorless speed control approach using an SMCO.
Efficiency, reliability, high power quality and continuous operation are important aspects in electric vehicle attraction system. Therefore, quick fault detection, isolation and enhanced fault-tolerant control for open-switches faults in inverter driving systems become more and more required in this filed. However, fault detection and localization algorithms have been known to have many performance limitations due to speed variations such as wrong decision making of fault occurrence. Those weaknesses are investigated and solved in this paper using currents magnitudes fault indices, current direct component fault indices and a decision system. A simulation model and experimental setup are utilized to validate the proposed concept. Many simulation and experimental results are carried out to show the effectiveness of the proposed fault detection approach.
This document summarizes a research paper on sensorless direct torque control of interior permanent magnet synchronous motors for embedded systems using an MRAS observer. It begins with an introduction to embedded systems and IPMSMs. It then provides the mathematical model of an IPMSM and describes the principles of direct torque control, including flux and torque hysteresis controllers and the inverter switching table. It presents an MRAS observer as a sensorless closed-loop algorithm for estimating rotor speed and position. In the simulation results, the proposed sensorless DTC control method using an MRAS observer is effective for embedded system applications.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Improved Rotor Speed Brushless DC Motor Using Fuzzy Controllerijeei-iaes
This document describes research on improving the rotor speed of a brushless DC motor using a fuzzy controller. It begins with background on BLDC motors and their advantages over brushed DC motors. It then provides the mathematical model of a BLDC motor. Next, it discusses implementing a PID fuzzy controller for a BLDC motor in Simulink and the design procedure, which involves first designing a conventional PID controller, then a linear fuzzy PID controller with the same performance, and finally adjusting the fuzzy inference system to create a nonlinear fuzzy PID controller.
Stability Analysis of DC-link Voltage Control on Autonomous Micro Hydro Power...IAES-IJPEDS
Micro Hydro Power Plant has become one of the interesting topics to be researched nowadays. This paper deals with the stability analysis on control system of excitation voltage in Micro Hydro Power Plant. The control of this voltage can be achieved by controlling the Permanent Magnet Synchronous Machine (PMSM) with particular algorithm so the voltage on the DC-link part of the system can be controlled. Without knowing the exact specification of system parameters, the system will be most likely unstable. The DC-link control system is modeled, simulated, and mathematically analyzed so the parameter specification for the stable system can be obtained.
This paper presents a novel hybrid control of a BLDC motor using a mixed sliding mode and fuzzy logic controller. The objective is to build a fast and robust controller which overcome classical controllers’ inconveniences and exploit the fast response of brushless dc motors characterized by an intense torque and fast response time. First the paper study pros and cons of both sliding mode and fuzzy logic controllers. Then the novel controller and its stability demonstration are presented. Finally the proposed controller method is used for the speed control of a BLDC motor 3KW. The obtained results are compared with those of a fuzzy logic and a conventional sliding mode controller. It allows to show performance of the proposed controller in terms of speed response and reaction against disturbances, which is improved more than 5 times without losing stability or altering tracking accuracy
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
A PROJECT REPORT SIM & SPEED CONTROL OF INDUCTIO DRIVEPawan Kumar
The document discusses speed control methods for three-phase induction motors. It analyzes the transients during starting of an induction motor with different machine parameters. It then examines various speed control methods including variable rotor resistance, variable stator voltage, and constant V/f control. Simulation results are presented to show the torque-speed characteristics for each method. Vector control is also introduced, which allows independent control of torque and flux.
Improved Torque Control Performance in Direct Torque Control using Optimal Sw...IJPEDS-IAES
This paper presents the significant improvement of Direct Torque Control (DTC) of 3-phases induction machine using a Cascaded H- Bidge Multilevel Inverter (CHMI). The largest torque ripple and variable switching frequency are known as the major problem founded in DTC of induction motor. As a result, it can diminish the performance induction motor control. Therefore, the conventional 2- level inverter has been replaced with CHMI the in order to increase the performance of the motor either in dynamic or steady-state condition. By using the multilevel inverter, it can produce a more selection of the voltage vectors. Besides that, it can minimize the torque ripple output as well as increase the efficiency by reducing the switching frequency of the inverter. The simulation model of the proposed method has been developed and tested by using Matlab software. Its improvements were also verified via experimental results.
Enhanced Torque Control and Reduced Switching Frequency in Direct Torque Cont...IJPEDS-IAES
Direct Torque Control (DTC) of induction machine has received wide
acceptance in many adjustable speed drive applications due to its simplicity
and high performance torque control. However, the DTC using a common
two-level inverter poses two major problems such as higher switching
frequency (or power loss) and larger torque ripple. These problems are due to
inappropriate voltage vectors which are selected among a limited number of
voltage vectors available in two-level inverter. The proposed research aims to
formulate an optimal switching strategy using Dual-Inverter Supplied Drive
for high performances of DTC. By using dual-inverter supplied, it provides
greater number of voltage vectors which can offer more options to select the
most appropriate voltage vectors. The most appropriate voltage vectors
should able to produce minimum torque slope but sufficient to satisfy torque
demands. The identification is accomplished by using an equation of rate of
change of torque which is derived from the induction machine equations. The
proposed strategy also introduces a block of modification of torque error
status which is responsible to modify the status such that it can determine the
most optimal voltage vectors from a look-up table, according to motor
operating conditions. The improvements obtained are as follows; 1)
minimization of switching frequency (reduce power loss), and 2) reduction of
torque ripple. Some improvements obtained in the proposed strategy were
verified via experimentations.
Direct torque control of IM using PID controller IJECEIAES
Direct torque control "DTC" technique is one of a high performance control system of an AC motor drive, which was proposed after the vector oriented control scheme during the resent 25 years. It has been developed rapidly for its concise system scheme, transient and dynamic performance. The DTC mechanism consists of voltage vector selection table, two hysteresis comparators and two estimator’s one for stator flux and another for electromagnetic torque. DTC is directly control torque and flux by using Voltage Source Inverter VSI, space vector and stator flux orientation and indirect speed regulated. A several control techniques can be used for improving the torque and flux performance. In this paper, the DTC with Proportional-Integral-Derivative (PID) controller used to improve the starting and dynamic performance of asynchronous motor AM, which gives good torque and flux response, best speed control and also minimize the unacceptable torque ripple. The mathematical model of DTC with PID controller of 3-phase induction motor IM are simulated under MatlabSimulink. Therefore, the DTC based on PID controller has good performance of IM compared to classical DTC for starting, running state and also during change in load.
The Nine-Switch Inverter(NSI) is a recently developed dual output converter. It can be used to drive two three-phase loads independently. As a substitute to two separate conventional voltage source inverters, the NSI has been, already, proposed in various industrial applications to reduce the numberof semiconductor switches and its associated energy losses and drive circuitry. On the other hand, the Direct Torque Control(DTC) is a robust control scheme of AC motors, which consist of selecting proper state vectors of a conventional voltage source inverter. The NSI, having a different working principle from the conventional voltage source inverter and taking into account the varying influence of active space vectors on motor’s torque and stator flux, a Direct Torque Control is suggested in this paper to, efficiently, drive two induction motors independently, while minimizing the torque and stator flux ripples of both motors. Simulations results confirm the effectiveness of the proposed algorithm. In addition, application of this newly proposed control scheme in operation of an Electric Vehicule (EV) is demonstrated.
Three-Level DTC Based on Fuzzy Logic and Neural Network of Sensorless DSSM Us...IJPEDS-IAES
This paper presents a direct torque control is applied for salient-pole double star synchronous machine without mechanical speed and stator flux linkage sensors. The estimation is performed using the extended Kalman filter known by it is ability to process noisy discrete measurements. Two control approaches using fuzzy logic DTC, and neural network DTC are proposed and compared. The validity of the proposed controls scheme is verified by simulation tests of a double star synchronous machine. The stator flux, torque, and speed are determined and compared in the above techniques. Simulation results presented in this paper highlight the improvements produced by the proposed control method based on the extended Kalman filter under various operation conditions.
This paper focuses on the modeling and control of a wind energy conversion chain using a permanent magnet synchronous machine. This system behaves a turbine, a generator, DC/DC and DC/AC power converters. These are connected on both sides to the DC bus, where the inverter is followed by a filter which is connected to the grid. In this paper, we have been used two types of controllers. For the stator side converter, we consider the Takagi-Sugeno approach where the parameters of controller have been computed by the theory of linear matrix inequalities. The stability synthesis has been checked using the Lyapunov theory. According to the grid side converter, the proportional integral controller is exploited to keep a constant voltage on the DC bus and control both types of powers. The simulation results demonstrate the robustness of the approach used.
An induction motor (IM) has been the workhorse of the industry for decades. It is due to its robustness, simple construction, requiring less maintenance and cheap. One of the most widely adopted IM drive control schemes for industrial applications is the open-loop constant V/Hz. In this paper, the important elements of an open-loop constant V/Hz drives are presented. These include the fundamental concept of a constant V/Hz scheme, the voltage source inverter (VSI) and its modulation schemes. Techniques that are commonly used to solve problems of low-speed operation and rotor speed regulation are briefly described. Simulations using MATLAB/Simulink package are used to help in illustrating these fundamental concepts. Finally, simple laboratory-scale experiments are conducted to implement the constant V/Hz control scheme on a ¼ hp induction motor. The constant V/Hz control is implemented using the DS1104 controller board with the C codes automatically generated from the Simulink model. A closer look at the current waveform when fref=25 Hz and 12 Hz and its respective Fourier analysis are presented. The results show that the high-frequency harmonic contents around the switching frequency can be observed for both cases, and the voltage waveform presents more spike noises in constrast to current waveform.
A Novel Direct Torque Control for Induction Machine Drive System with Low Tor...IAES-IJPEDS
This document describes a novel direct torque control method for induction machine drives using space vector modulation (DTC-SVM) to reduce torque and flux ripples. Simulation results show the proposed DTC-SVM control achieves lower ripples compared to the conventional DTC method. The DTC-SVM control strategy is designed and simulated using Matlab/Simulink and implemented on an FPGA using Xilinx System Generator. Simulation results verify the DTC-SVM control is effective at minimizing torque and flux ripples for induction machine drives.
Modeling and control of double star induction machine by active disturbance r...TELKOMNIKA JOURNAL
This paper aims to contribute to the modeling and control of the double star induction machine (DSIM) by a robust method called active disturbance rejection control (ADRC). The ADRC has become in the last decade one of the most important techniques of regulation. This method is based on the use of an ESO (Extended State Observer) which estimates in real-time and at the same time the external disturbances and the errors due to the variations of the parameters of the machine and to the uncertainties of modeling. The two stators of DSIM are powered by three-phase inverters based on transistors and MLI control and the entire system is modeled in Park's reference. We analyze in the Matlab/Simulink environment the dynamic behavior of the system and the different ADRC controllers under different operating conditions. The result has demonstrated the performance and effectiveness of the ADRC.
Analysis of Direct Torque Control of Industrial Drives using Zone-Shifting SVMIJPEDS-IAES
Direct Torque Control of Induction Motor has gained popularity in industrial applications mainly due to its simple control structure from its first introduction in 1986. Here the direct torque control (DTC) of induction motor with zone shifting space vector modulation (SVM) has been done. It uses a simple phase current re-construction algorithm for three phase induction motor (IM). The phase current re-construction algorithm is done by using information from the current that is from the phases between the inverter and the induction motor. The proposed algorithm is robust and very simple. It uses the AC current to get the stator current for estimating the motor flux and the electromagnetic torque. By evaluating through the torque value and the current the controlling of induction motor is done. The simulation results are also given which supports the direct torque control strategy of the induction motor (IM).
The paper proposes a complete modeling and control technique of variable speed wind turbine system (WTS) based on the doubly fed induction generator (DFIG). Two levels back-to-back converter is used to ensure the energy transfer between the DFIG rotor and the grid. The wind turbine to operate efficiently, a maximum power point tracking (MPPT) algorithm is implemented. Then, direct power control (DPC) strategy has been combined with the MPPT technique in order to guarantee the selection of the appropriate rotor voltage vectors and to minimize the active and reactive power errors. Finally, the simulation is performed by using MATLAB/simulink platform basing on 7.5KW DFIG wind generation system, and the results prove the effectiveness of our proposed control technique.
Advanced control scheme of doubly fed induction generator for wind turbine us...IJECEIAES
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
1) The document proposes an enhanced direct torque control strategy for induction motor drives based on an imaginary swapping instant concept.
2) Simulation results show the proposed technique improves performance over conventional direct torque control, reducing torque and flux ripples by over 60% and speeding transient response times.
3) Benefits of the proposed technique include better robustness against parameter and load variations across low and high speed ranges.
Wind energy has many advantages, it does not pollute and it is an inexhaustible source. However, the cost of this energy is still too high to compete with traditional fossil sources. The yield of a wind turbine depends on three parameters: the power of the wind, the turbine power curve and the ability of the generator to respond to fluctuations in the wind. This article presented the MPPT of a wind turbine system equipped with an asynchronous generator has dual power under MatlabSimulink program, in the first time we simulated all the conversion chain with complete model of DFIG and vector control in second stepthen applied the extracted maximum power MPPT strategists, this command is effective and has several advantages it offered to kept the maximum power delivered to network despite all the parameter is change.
This document describes a hybrid system approach to modeling direct torque control of an induction motor coupled to an inverter. It first models the direct torque control as a hybrid system, with a discrete event dynamics defined by the inverter voltage vectors, and continuous dynamics defined by the stator flux vector and electromagnetic torque. It then abstracts the continuous dynamics in terms of discrete events representing the flux and torque entering/exiting a working point region, and the passage of the flux vector between zones. Finally, it uses supervisory control theory to drive the inverter-motor system to a desired working point by controlling the discrete event dynamics.
Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.
Active and Reactive Power control operation of DFIG forWind Power Generation ...IOSR Journals
This document presents a study on controlling the active and reactive power of a doubly fed induction generator (DFIG) for wind power generation using fuzzy logic. It first describes the DFIG system and its vector control scheme using rotor side and grid side converters. It then discusses modeling the DFIG, controlling the rotor side converter using stator flux orientation, controlling the grid side converter using voltage orientation, and designing a fuzzy logic controller. Simulation results show that a fuzzy logic controller combined with a PI controller improves the tracking of active and reactive power references under different operating conditions compared to using just a PI controller. The paper concludes that DFIG performance can be enhanced using a fuzzy tuned PI controller.
This document summarizes a research paper that proposes a novel method to improve direct torque control (DTC) for induction machine drives using a controlled rectifier. The paper begins with an overview of DTC and its limitations of torque and flux ripples. It then describes the proposed method of using a PI controller and controlled rectifier to adjust the DC bus voltage based on torque error, allowing selection of a voltage vector that reduces ripples. Simulation results presented in MATLAB/Simulink show the proposed method significantly reduces current distortion and torque/flux ripples compared to standard DTC.
Wind turbine doubly-fed induction generator defects diagnosis under voltage dipsTELKOMNIKA JOURNAL
Voltage dips are brief but frequent disturbances that can be defined as the most important problem affecting all electrical grids, it cannot be completely avoided and represent the main priority for the industry. This study remains part of monitoring the quality of electrical energy’s field. Its aim is to apply two approaches signals for improving the failure recognition in wind turbine conversion chain. One is based on the combination of spectral analysis of stator current by fast Fourier transform and Lissajous curves technique of grid currents. The second approach is based on the stator current analysis by discrete wavelet transform which is considered an ideal tool for this purpose due to its time-frequency localization. These defects diagnosis methods have shown their efficiency in detection, visualization and analysis of voltage dips in order to develop a control strategy for a wind turbine requiring continuity of its service despite the presence of voltage dips.
Indirect Control of a Doubly-Fed Induction Machine for Wind Energy ConversionIAES-IJPEDS
In this paper, a grid connected wind power generation scheme using a doubly fed induction generator (DFIG) is studied. The aims of this paper are: The modelling and simulation of the operating in two quadrants (torque-speed) of a DFIG, the analysis employs a stator flux vector control algorithm to control rotor current, the system enables optimal speed tracking for maximum energy capture from the wind and high performance active and reactive power regulation using the PI regulator. The simulation calculations were achieved ®®
using MATLAB -SIMULINK package. Lastly, the obtained results are presented, for different operating points, illustrating the good control performances of the system
Similar to Contribution to the Improvement of the Performances of Doubly Fed Induction Machine Functioning in Motor Mode By the DTC Control (20)
The aim of this research is the speed tracking of the permanent magnet synchronous motor (PMSM) using an intelligent Neural-Network based adapative backstepping control. First, the model of PMSM in the Park synchronous frame is derived. Then, the PMSM speed regulation is investigated using the classical method utilizing the field oriented control theory. Thereafter, a robust nonlinear controller employing an adaptive backstepping strategy is investigated in order to achieve a good performance tracking objective under motor parameters changing and external load torque application. In the final step, a neural network estimator is integrated with the adaptive controller to estimate the motor parameters values and the load disturbance value for enhancing the effectiveness of the adaptive backstepping controller. The robsutness of the presented control algorithm is demonstrated using simulation tests. The obtained results clearly demonstrate that the presented NN-adaptive control algorithm can provide good trackingperformances for the speed trackingin the presence of motor parameter variation and load application.
The document presents a new method for fault classification and direction discrimination in transmission lines using 1D convolutional neural networks (1D-CNNs). A 132kV transmission line model is simulated to generate training and testing data for the 1D-CNN algorithm. The proposed 1D-CNN approach directly uses the voltage and current signals from one end as input, merging feature extraction and classification into a single learning process. Testing shows the 1D-CNN method accurately classifies and discriminates fault direction with higher accuracy than conventional neural network and fuzzy neural network methods under different fault conditions.
Among the most widespread renewable energy sources is solar energy; Solar panels offer a green, clean, and environmentally friendly source of energy. In the presence of several advantages of the use of photovoltaic systems, the random operation of the photovoltaic generator presents a great challenge, in the presence of a critical load. Among the most used solutions to overcome this problem is the combination of solar panels with generators or with the public grid or both. In this paper, an energy management strategy is proposed with a safety aspect by using artificial neural networks (ANNs), in order to ensure a continuous supply of electricity to consumers with a maximum solicitation of renewable energy.
In this paper, the artificial neural network (ANN) has been utilized for rotating machinery faults detection and classification. First, experiments were performed to measure the lateral vibration signals of laboratory test rigs for rotor-disk-blade when the blades are defective. A rotor-disk-blade system with 6 regular blades and 5 blades with various defects was constructed. Second, the ANN was applied to classify the different x- and y-axis lateral vibrations due to different blade faults. The results based on training and testing with different data samples of the fault types indicate that the ANN is robust and can effectively identify and distinguish different blade faults caused by lateral vibrations in a rotor. As compared to the literature, the present paper presents a novel work of identifying and classifying various rotating blade faults commonly encountered in rotating machines using ANN. Experimental data of lateral vibrations of the rotor-disk-blade system in both x- and y-directions are used for the training and testing of the network.
This paper focuses on the artificial bee colony (ABC) algorithm, which is a nonlinear optimization problem. is proposed to find the optimal power flow (OPF). To solve this problem, we will apply the ABC algorithm to a power system incorporating wind power. The proposed approach is applied on a standard IEEE-30 system with wind farms located on different buses and with different penetration levels to show the impact of wind farms on the system in order to obtain the optimal settings of control variables of the OPF problem. Based on technical results obtained, the ABC algorithm is shown to achieve a lower cost and losses than the other methods applied, while incorporating wind power into the system, high performance would be gained.
The significance of the solar energy is to intensify the effectiveness of the Solar Panel with the use of a primordial solar tracking system. Here we propounded a solar positioning system with the use of the global positioning system (GPS) , artificial neural network (ANN) and image processing (IP) . The azimuth angle of the sun is evaluated using GPS which provide latitude, date, longitude and time. The image processing used to find sun image through which centroid of sun is calculated and finally by comparing the centroid of sun with GPS quadrate to achieve optimum tracking point. Weather conditions and situation observed through AI decision making with the help of IP algorithms. The presented advance adaptation is analyzed and established via experimental effects which might be made available on the memory of the cloud carrier for systematization. The proposed system improve power gain by 59.21% and 10.32% compare to stable system (SS) and two-axis solar following system (TASF) respectively. The reduced tracking error of IoT based Two-axis solar following system (IoT-TASF) reduces their azimuth angle error by 0.20 degree.
Kosovo has limited renewable energy resources and its power generation sector is based on fossil fuels. Such a situation emphasizes the importance of active research and efficient use of renewable energy potential. According to the analysis of meteorological data for Kosovo, it can be concluded that among the most attractive potential wind power sites are the locations known as Kitka (42° 29' 41" N and 21° 36' 45" E) and Koznica (42° 39′ 32″ N, 21° 22′30″E). The two terrains in which the analysis was carried out are mountain areas, with altitudes of 1142 m (Kitka) and 1230 m (Koznica). the same measuring height, about 84 m above the ground, is obtained for these average wind speeds: Kitka 6,667 m/s and Koznica 6,16 m/s. Since the difference in wind speed is quite large versus a difference in altitude that is not being very large, analyses are made regarding the terrain characteristics including the terrain relief features. In this paper it will be studied how much the roughness of the terrain influences the output energy. Also, that the assumption to be taken the same as to how much they will affect the annual energy produced.
The document summarizes a research paper that proposes using a battery energy storage system (BESS) with droop control to reduce frequency fluctuations in a multi-machine power system connected to a large-scale photovoltaic (PV) plant. The paper develops a droop control strategy for the BESS that incorporates a frequency error signal and dead-band. Simulation results using PSCAD/EMTDC software show that the proposed droop control-based BESS can efficiently curtail frequency oscillations caused by fluctuations in PV power injection due to changing solar irradiance.
This study investigates experimentally the performance of two-dimensional solar tracking systems with reflector using commercial silicon based photovoltaic module, with open and closed loop control systems. Different reflector materials were also investigated. The experiments were performed at the Hashemite University campus in Zarqa at a latitude of 32⁰, in February and March. Photovoltaic output power and performance were analyzed. It was found that the modified photovoltaic module with mirror reflector generated the highest value of power, while the temperature reached a maximum value of 53 ̊ C. The modified module suggested in this study produced 5% more PV power than the two-dimensional solar tracking systems without reflector and produced 12.5% more PV power than the fixed PV module with 26⁰ tilt angle.
The development of modeling wind speed plays a very important in helping to obtain the actual wind speed data for the benefit of the power plant planning in the future. The wind speed in this paper is obtained from a PCE-FWS 20 type measuring instrument with a duration of 30 minutes which is accumulated into monthly data for one year (2019). Despite the many wind speed modeling that has been done by researchers. Modeling wind speeds proposed in this study were obtained from the modified Rayleigh distribution. In this study, the Rayleigh scale factor (Cr) and modified Rayleigh scale factor (Cm) were calculated. The observed wind speed is compared with the predicted wind characteristics. The data fit test used correlation coefficient (R2), root means square error (RMSE), and mean absolute percentage error (MAPE). The results of the proposed modified Rayleigh model provide very good results for users.
This paper deals with an advanced design for a pump powered by solar energyto supply agricultural lands with water and also the maximum power point is used to extract the maximum value of the energy available inside the solar panels and comparing between techniques MPPT such as Incremental conductance, perturb & observe, fractional short current circuit, and fractional open voltage circuit to find the best technique among these. The solar system is designed with main parts: photovoltaic (PV) panel, direct current/direct current (DC/DC) converter, inverter, filter, and in addition, the battery is used to save energy in the event that there is an increased demand for energy and not to provide solar radiation, as well as saving energy in the case of generation more than demand. This work was done using the matrix laboratory (MATLAB) simulink program.
The objective of this paper is to provide an overview of the current state of renewable energy resources in Bangladesh, as well as to examine various forms of renewable energies in order to gain a comprehensive understanding of how to address Bangladesh's power crisis issues in a sustainable manner. Electricity is currently the most useful kind of energy in Bangladesh. It has a substantial influence on a country's socioeconomic standing and living standards. Maintaining a stable source of energy at a cost that is affordable to everyone has been a constant battle for decades. Bangladesh is blessed with a wealth of natural resources. Bangladesh has a huge opportunity to accelerate its economic development while increasing energy access, livelihoods, and health for millions of people in a sustainable way due to the renewable energy system.
When the irradiance distribution over the photovoltaic panels is uniform, the pursuit of the maximum power point is not reached, which has allowed several researchers to use traditional MPPT techniques to solve this problem Among these techniques a PSO algorithm is used to have the maximum global power point (GMPPT) under partial shading. On the other hand, this one is not reliable vis-à-vis the pursuit of the MPPT. Therefore, in this paper we have treated another technique based on a new modified PSO algorithm so that the power can reach its maximum point. The PSO algorithm is based on the heuristic method which guarantees not only the obtaining of MPPT but also the simplicity of control and less expensive of the system. The results are obtained using MATLAB show that the proposed modified PSO algorithm performs better than conventional PSO and is robust to different partial shading models.
A stable operation of wind turbines connected to the grid is an essential requirement to ensure the reliability and stability of the power system. To achieve such operational objective, installing static synchronous compensator static synchronous compensator (STATCOM) as a main compensation device guarantees the voltage stability enhancement of the wind farm connected to distribution network at different operating scenarios. STATCOM either supplies or absorbs reactive power in order to ensure the voltage profile within the standard-margins and to avoid turbine tripping, accordingly. This paper present new study that investigates the most suitable-location to install STATCOM in a distribution system connected wind farm to maintain the voltage-levels within the stability margins. For a large-scale squirrel cage induction generator squirrel-cage induction generator (SCIG-based) wind turbine system, the impact of STATCOM installation was tested in different places and voltage-levels in the distribution system. The proposed method effectiveness in enhancing the voltage profile and balancing the reactive power is validated, the results were repeated for different scenarios of expected contingencies. The voltage profile, power flow, and reactive power balance of the distribution system are observed using MATLAB/Simulink software.
The electrical and environmental parameters of polymer solar cells (PSC) provide important information on their performance. In the present article we study the influence of temperature on the voltage-current (I-V) characteristic at different temperatures from 10 °C to 90 °C, and important parameters like bandgap energy Eg, and the energy conversion efficiency η. The one-diode electrical model, normally used for semiconductor cells, has been tested and validated for the polemeral junction. The PSC used in our study are formed by the poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM). Our technique is based on the combination of two steps; the first use the Least Mean Squares (LMS) method while the second use the Newton-Raphson algorithm. The found results are compared to other recently published works, they show that the developed approach is very accurate. This precision is proved by the minimal values of statistical errors (RMSE) and the good agreement between both the experimental data and the I-V simulated curves. The obtained results show a clear and a monotonic dependence of the cell efficiency on the studied parameters.
The inverter is the principal part of the photovoltaic (PV) systems that assures the direct current/alternating current (DC/AC) conversion (PV array is connected directly to an inverter that converts the DC energy produced by the PV array into AC energy that is directly connected to the electric utility). In this paper, we present a simple method for detecting faults that occurred during the operation of the inverter. These types of faults or faults affect the efficiency and cost-effectiveness of the photovoltaic system, especially the inverter, which is the main component responsible for the conversion. Hence, we have shown first the faults obtained in the case of the short circuit. Second, the open circuit failure is studied. The results demonstrate the efficacy of the proposed method. Good monitoring and detection of faults in the inverter can increase the system's reliability and decrease the undesirable faults that appeared in the PV system. The system behavior is tested under variable parameters and conditions using MATLAB/Simulink.
The document describes a proposed modified bridge-type nonsuperconducting fault current limiter (NSFCL) for distribution networks. The NSFCL consists of a bridge rectifier, two DC reactors (one small in series and one large in parallel), and an IGBT semiconductor switch controlled by a command circuit. During normal operation, the IGBT is on and the parallel reactor is bypassed, making the NSFCL invisible. During a fault, the IGBT turns off, inserting the parallel reactor to limit fault current. Simulation results showed the design effectively limits fault current while minimally affecting normal operation.
This paper provides a new approach to reducing high-order harmonics in 400 Hz inverter using a three-level neutral-point clamped (NPC) converter. A voltage control loop using the harmonic compensation combined with NPC clamping diode control technology. The capacitor voltage imbalance also causes harmonics in the output voltage. For 400 Hz inverter, maintain a balanced voltage between the two input (direct current) (DC) capacitors is difficult because the pulse width modulation (PWM) modulation frequency ratio is low compared to the frequency of the output voltage. A method of determining the current flowing into the capacitor to control the voltage on the two balanced capacitors to ensure fast response reversal is also given in this paper. The combination of a high-harmonic resonator controller and a neutral-point voltage controller working together on the 400 Hz NPC inverter structure is given in this paper.
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second part deals with the control of this machine. In a third part, in order to validate our model, simulation
results using the Matlab/Simulink software will be presented and analyzed.
2. MODELING OF THE DFIM
The global system is illustrated in Figure 1 below, it consists of two converters, one is connected to
the stator and the other is connected to the rotor of the machine studied [9]-[10].
Figure1. Overall scheme of the system studied
The model of the doubly fed induction machine after the Park transformation is defined by the
electrical, magnetic and mechanical following equations [11]-[12]:
2.1. The electrical equations
The electrical stator and rotor equations of the DFIM in the reference frame (d, q) are expressed by
[13]-[14]:
{
with: (1)
{
with: and M=Msr=Mrs (2)
2.2. The magnetic equations
The expressions of the flux are extracted from the electrical Equations (2):
{
(3)
2.3. The mechanical equation
The fundamental equation of dynamics:
(4)
DFIM
Mechanical load
Stator
Rotor
(C2)
(R2 ,L2)
(C1)
(R1 ,L1)
Inverter
Inverter Rectifier
Rectifier
Grid Grid
DTC control
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The electromagnetic torque is expressed as a function of the currents and the flux by:
( ) (5)
With:
Vs(d,q),Vr(d,q) : Stator and rotor voltages in the reference frame (d, q).
Is(d,q), Ir(d,q) : Stator and rotor currents in the reference frame (d, q).
s(d,q), r(d,q) : Stator and rotor flux in the reference frame (d, q).
Rs, Rr : Stator and rotor resistances.
Ls, Lr : Stator and rotor inductances.
M : Mutual inductance.
P : Pole pair number.
σ : Dispersion coefficient.
ωs, ωr : Stator and rotor pulsations.
Tem, Tr : Electromagnetic and load torque.
Ω : Rotation speed of the machine (ω=p.Ω).
J : Moment of inertia.
f: : Coefficient of viscous friction.
The implementation on Matlab/Simulink of the DFIM is represented by the following Figure 2:
Figure 2. Simulink Model of the DFIM
3. DIRECT TORQUE CONTROL
3.1. Principle of the DTC control
The general principle of direct torque control is based on the direct regulation of the torque and flux
of the doubly fed induction machine by selecting one of the eight voltage vectors generated by each voltage
inverter. This choice is generally based on the use of hysteresis regulators whose function is to control the
state of the machine [15]-[16]. The voltage vector V can be written in the form [17]:
√ ) (6)
o Si(i=a,b,c)=0 if the high switch is closed and the low switch is open.
o Si(i=a,b,c)=1 if the high switch is open and the low switch is closed.
The combinations of three magnitudes (Sa, Sb, Sc) allow to generate eight positions of the voltage
vector V which two correspond to the zero vector (Sa, Sb, Sc) = (000) and (111) as shown in Figure 3.
2
w
1
Te
f lux-sd
isq
f lux-sq
isd
Tr
Te
w
mechanical model
f lux-sd
f lux-sq
f lux-rd
f lux-rq
isd
isq
ird
irq
magnetic Model
Vsd
Vsq
isd
isq
ws
ph-sd
ph-sq
electric model / stator
Vrd
Vrq
ird
irq
wr
ph-rd
ph-rq
electric model / rotor
[flux_sd]
1
[Isq]
[Isd]
[flux_rd]
[flux_rd]
[Isq]
[Isd]
[Isd]
[flux_sq]
[flux_sd]
[flux_sd]
[Ird]
p
[Irq]
[Irq]
[Isq]
[Ird]
6
Tr
5
Vrq
4
Vrd
3
ws
2
Vsq
1
Vsd
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Figure 3. Elaboration of voltage vectors from voltage inverters of the DFIM
3.2. Strategy of the DTC control
To realize this command it is necessary every instant to control the stator flux, the rotor flux and the
electromagnetic torque of the machine.
3.2.1. Control of the stator and rotor flux
The relation between the flux vectors of the DFIM and the voltage vectors is given by the following
equations system [18]:
{
⃗⃗⃗⃗ ) ∫ (⃗⃗⃗ ⃗⃗ ) ⃗
⃗⃗⃗⃗ ) ∫ (⃗⃗⃗ ⃗⃗⃗ ) ⃗
(7)
On an interval [0, te], we consider that the terms RsIs and RrIr are respectively negligible in front of
Vs and Vr. Thus, we can write the equations (7) in the form:
{
⃗⃗⃗⃗ ⃗ ⃗⃗⃗
⃗⃗⃗⃗ ⃗ ⃗⃗⃗
(8)
In general, for each flux we have:
⃗ )
⃗ )
⃗ (9)
With:
⃗ ) : Vector of the flux in the step of current sampling.
⃗ ) : Vector of the flux in the step of following sampling.
: Sampling period.
In order to obtain a functioning with a module of constant flux, we can follow the extremity of ⃗ on
an almost circular trajectory, by choosing a correct sequence of the vector V for the different successive time
intervals of duration te.
Figure 4. Example of the evolution of ⃗⃗⃗ extremity
K’1 K’2 K’3
(B)
(A)
(C)
(a)
(b)
(c)
Vs1(100)
Vs4(011)
Vs7(111)
Vs6(101)
Vs5(001)
Vs3(010) Vs2(110)
Vs0(000)
d
q
Vr1(100)
Vr4(011)
Vr7(111)
Vr6(101)
Vr5(001)
Vr3(010) Vr2(110)
Vr0(000
)
d
q
Inverter connected to the stator
Inverter connected to the rotor
K1 K2 K3
K4 K5 K6
K’4 K’5 K’6
U0
U’0
U0/2
U0/2
U’0/2
U’0/2
DFIM
V4 V1
V6
V5
V3 V2
α
β
⃗⃗⃗ (k+1)
⃗⃗⃗ (k)
V3
t=
0
t=t
e
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3.2.2. Control of the electromagnetic torque
The expression of the electromagnetic torque in the reference frame (α, β) is written [19]:
⃗ | ⃗ | ) (10)
With: : the angle of phase shift between the two stator and rotor flux.
According to the equation (10), we notice that the electromagnetic torque of the DFIM depends on
the amplitude of two vectors ⃗ and ⃗ and the angle between them, if we succeed in controlling perfectly
this two flows in module and in position, we can thus control the torque.
3.2.3. Choice of the voltage vector
The voltage vector selection depends on the flux position in the reference frame (α, β) and the
variation desired for the flux module and for the electromagnetic torque. The evolution space of the flux is
decomposed into six sectors of 60 °: When the flux vector is in the sector Si, the control of the flux and the
torque can be made in the way presented in the following Table 1:
Table 1. Choice of the voltage vector
The evolution of the flux and the torque Choice of the
voltage vector
Flux Torque
Increasing Increasing Vi+1
Decreasing Increasing Vi+2
Increasing Decreasing Vi-1
Decreasing Decreasing Vi-2
The vectors V0 and V7 are chosen to stop the movement of the flux.
3.3. Estimation of the flux and the torque
The estimation of the stator and rotor flux is basing of the stator and rotor voltages and currents. The
flux components of the DFIM in the reference frame (α, β) are determined by [20]:
{
̂ ∫ )
̂ ∫ ( )
̂ ∫ )
̂ ∫ ( )
(11)
With: ̂ ̂ and ̂ ̂ . The modules of the stator and rotor flux are written:
{
̂ √ ̂ ̂
̂ √ ̂ ̂
(12)
The positions of the flux vectors are calculated as follows:
{
̂
̂
)
̂
̂
)
(13)
The electromagnetic torque is estimated from the measured stator currents:
̂ ( ̂ ̂ ) (14)
The DTC control is vectorial, it is necessary to decompose three currents and voltages (iabc, Vabc) in
components direct (iα, Vα) and quadratic (iβ, Vβ) according to the Concordia transformation, such as:
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( ) √ ( √ √
) ( ) (15)
With: X = Vs, Vr, is or ir.
3.4. Elaboration of the control vector (Switching table)
3.4.1. Regulators elaboration of the flux and the torque
The difference εϕ, between the reference flux ϕref and the estimated flux ϕest is introduced into a
hysteresis regulator with two-level, the latter will generate the binary variable (Hϕ = 0, 1) at its output,
representing the desired evolution for the flux:
a. Hϕ=0 means that the flux must be decreased.
b. Hϕ=1 means that the flow must be increased.
Figure 5. Hysteresis regulator with two levels
Similarly, the immediate error of the couple εTem is calculated by comparing its reference value Tem-ref
and its estimated value Tem-est, then applied to a three-level hysteresis regulator, generating at its output the
variable HTem with three levels (-1,0,1), representing the direction of temporal evolution desired for the torque:
a. HTem = 1 means that the torque must be increased.
b. HTem = 0 means that the torque must be decreased.
c. HTem=-1 means that it is necessary to maintain the torque inside the band.
Figure 6. Hysteresis regulator with three levels
3.4.2. Elaboration of the switching table.
The state choice of each voltage inverter is made in a switching table elaborated according to the
state of the variables (Hϕ and HTem) at the output of the flux regulators and the electromagnetic torque, as
well as sector giving the information about the position of vector of the flux. Table 2 is presented in the
following form:
Table 2. Switching table
Sector Si
1 2 3 4 5 6
Hϕs or Hϕr HTem voltage vector
1 1 V2(110) V3(010) V4(011) V5(001) V6(101) V1(100)
1 0 V7(111) V0(000) V7(111) V0(000) V7(111) V0(000)
1 -1 V6(101) V1(100) V2(110) V3(010) V4(011) V5(001)
0 1 V3(010) V4(011) V5(001) V6(101) V1(100) V2(110)
0 0 V0(000) V7(111) V0(000) V7(111) V0(000) V7(111)
0 -1 V5(001) V6(101) V1(100) V2(110) V3(010) V4(011)
ϕest
εϕ
0
1
+
-
ϕref Hϕ
-
+
-1
1
0
Tem-est
Tem-ref εTem HTem
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The general structure of direct torque control of the doubly fed induction machine is detailed in the
following Figure 7:
Figure 7. General structure of the direct torque control applied to the DFIM
4. RESULTS AND DISCUSSION
The global model of the system studied (DFIM and blocks of the DTC control) is simulated in the
Matlab/Simulink environment.
Figure 8. Simulation scheme of the DTC control on the Matlab/Simulink environment
4.1. Simulation results
To show the performances of direct torque control applied to DFIM, we present the simulation
results of the system for reference flux ( s-ref = 1Wb, r-ref = 0.5Wb). The bandwidth of hysteresis
comparator of the torque is fixed in ±0.01N.m and those of the comparators of the stator and rotor flows are
fixed to ±0.005 Wb.
phis-ref
phir-ref
Vr_alpha
Vr_beta
Ir_alpha
Ir_beta
phir
Nr
estimation
Vs_alpha
Vs_beta
Is_alpha
Is_beta
phis
Ns
Cem
estimation
corr flux
corr flux
dTe eTe
corr couple
irabc isabc
phir
Tem
w
phis
ephi
eTe
N
Sa
Sb
Sc
Switching table
ephi
eTe
N
Sa
Sb
Sc
Switching table
wref
Inverter
Park
Inverter
Tr
Park Inverse
Park
DFIM
Park Inverse
[Isq]
[Tem]
[w]
[Firq]
[Fird]
[Fisq]
[Fisd]
[Vrq]
[Vrd]
[Vsq]
[Vsd]
[Isd]
[Irq]
[Ird]
[tetaS]
[Vsq]
[Vsd]
[Isq]
[Isd]
[wref]
[tetaR]
[w]
[Irq]
[tetaS]
[Ird]
[Isq]
[Isd]
[Tr]
[tetaR] [tetaS]
[Vrq]
[Vrd]
[Irq]
[Ird]
[w]
[tetaR]
[Tem]
Isd
Isq
Vsd
Vsq
tetaS
V_alpha
V_beta
i_alpha
i_beta
(d,q) ---->(alpha;beta)
Ird
Irq
Vrd
Vrq
tetaR
V_alpha
V_beta
i_alpha
i_beta
(d,q) ----> (alpha;beta)
wref
w
Tref
Vs
Is
Switching
table
Switching
table
Transformation (a,b,c) to (α,β)
-
+
Rotor flux
estimator
Irα,β Vrα,β
3
2
Vr
Ir
1
5
4
Sector
6
3 2
-
+
φrα,β
Irα,β
Torque
estimator
1
5
4
Sector
6
3 2
-+
Rotor flux
estimator
VSα,β ISα,β
Transformation (a,b,c) to (α,β)
3
2
Grid Grid
Inverter
Inverter Rectifier
Rectifier
DFIM
(C2)
(R2 ,L2)
(C1)
(R1 ,L1)
HTem
Hϕr
Hϕs
εTem Tem-est
Tref
Φs-est
Φr-ref
Φr-est
Φs-ref
εϕr
εϕs
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4.1.1. Test with constant speed
The figures below present the response of the magnitudes of the doubly fed induction machine at
constant speed and variable load (the reference torque of set-points ranging from 0 → 10 N.m → 5 N.m). In
this test, the rotation speed reaches its reference without overtaking, it is insensitive to changes in the load
(Figure 9.a). Figure 9.b show that the torque has good dynamics whose mean value follows the setpoint
values with a very fast response time which equals tr = 0.32s, but it has low ripples. The stator and rotor flux
remain constant at its reference values whatever the applied load which shows that the torque and the flux are
decoupled (Figure 9.c). The evolution of these flows in the reference frame (α, β) is perfectly circular
(Figure 9.d). The components of the stator and rotor currents in the (a, b, c) reference have sinusoidal patterns
with a frequency proportional to the reference speed, they reply well to the variations imposed by the load
torque (Figure 9.e and Figure 9.f).
(a) (b) (c)
(d) (e) (f)
Figure 9. Test with constant speed, (a) Rotation speed (b) Electromagnetic torque (c) Stator and rotor flux (d)
Evolution of the stator and rotor flux in the reference frame (α, β) (e) Stator currents (f) Rotor currents
4.1.2. Test with variable speed
The figures below show the simulation results of the DTC control applied to DFIM with variable
speed and variable load. In the variable speed test, the Figure 10.a and Figure 10.b show the high dynamics
of the rotation speed and the electromagnetic torque of the DFIM, with a fast response time to the change of
the set-points. The components of the stator and rotor currents in the (a, b, c) reference are always sinusoids,
their frequencies and their amplitudes vary respectively as a function of the rotation speed and the load
torque imposed (Figure 10.e and Figure 10.f). The stator and rotor flux remain constant at its reference
values, which validates that the DTC control is robust towards the variation of the load and the speed as
shown in Figure 10.c. These stator and rotor flux are trapped in a circle regardless of the applied load, which
shows that the flux constancy despite the load as shown in Figure10.d, we conclude that the torque and flux
are decoupled. These simulation results show the effectiveness of this control technique.
0 0.5 1 1.5 2 2.5 3
0
20
40
60
80
100
120
Time (s)
Rotation
speed
(rad/s)
ref
0 0.5 1 1.5 2 2.5 3
-5
0
5
10
15
20
Time (s)
Electromangetic
torque
(N.m)
Tem
Tref
0 0.5 1 1.5 2 2.5 3
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Time (s)
Stator
and
rotor
flux
(Wb)
s
r
-1.5 -1 -0.5 0 0.5 1 1.5
-1.5
-1
-0.5
0
0.5
1
1.5
s
and r
s
and
r
s
r
0 0.5 1 1.5 2 2.5 3
-20
-10
0
10
20
Time (s)
Stator
currents
(A)
0.5 0.52 0.54
-10
0
10
Time (s)
Zoom
31.8Hz
2.45 2.5 2.55 2.6
-10
0
10
Time (s)
isa
isb
isc
0 0.5 1 1.5 2 2.5 3
-20
-10
0
10
20
Time (s)
Rotor
currents
(A)
2.3 2.4 2.5 2.6 2.7 2.8
-10
0
10
Time (s)
Zoom
ira
irb
irc
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(a) (b) (c)
(d) (e) (f)
Figure 10. Test with variable speed, (a) Rotation speed (b) Electromagnetic torque (c) Stator and rotor flux
(d) Evolution of the stator and rotor flux in the reference frame (α, β) (e) Stator currents (f) Rotor currents
5. CONCLUSION
In this work, we presented the direct torque control applied to a DFIM used in motor mode,
powered by two converters, one on the stator and the other on the rotor. After a study of the modeling of the
system, we realized the implementation of the DTC control based on the direct regulation of flux and torque.
The interpretation of the obtained results shows clearly that the system follows perfectly the reference
values and, by consequence, supplies a good static and dynamic performance of the studied machine.
APPENDIX
Table 3. Parameters of the DFIM
Variable Symbol Value (unit)
Nominal power
Stator nominal voltage
Rototor nominal voltage
Frequency
Pair pole number
Pm
Vsn
Vrn
f
P
1.5 kW
220V
130V
50 Hz
2
Stator self inductance Ls 0.295 H
Rotor self inductance Lr 0.104 H
Maximum of mutual inductance M 0.165 H
Stator resistance Rs 1.75 Ω
Rotor resistance Rr 1.68 Ω
Total viscous frictions f 0.0027 Kg.m²/s
Total inertia J 0.01 Kg.m²
REFERENCES
[1] K. Chen, et al., “Minimum copper loss and power distribution control strategiesof double-inverter-fed wound-rotor
induction machines using energetic macroscopic representation,” IEEE Trans. Energy Conve, vol/issue: 25(3), pp.
642–651, 2010.
[2] P. E. Vidal and M. P. David, “Flux Sliding Mode Control of a Doubly Fed Induction Machine,” European
Conference on Power Electronics and Applications, Dresden, Germany, 2005.
0 0.5 1 1.5 2 2.5 3
0
20
40
60
80
100
120
Time (s)
Rotation
speed
(rad/s)
ref
0 0.5 1 1.5 2 2.5 3
-10
-5
0
5
10
15
20
25
Time (s)
Electromagnetic
torque
(N.m)
Tem
Tref
0 0.5 1 1.5 2 2.5 3
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Time (s)
Stator
and
rotor
flux
(Wb)
s
r
-1.5 -1 -0.5 0 0.5 1 1.5
-1.5
-1
-0.5
0
0.5
1
1.5
s
and r
s
and
r
s
r
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ira
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10. ISSN: 2088-8694
IJPEDS Vol. 8, No. 3, September 2017 : 1117 – 1127
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[3] P. E. Vidal, “Commande non-linéaire d'une machine asynchrone à double alimentation,” Thesis in Electrical
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[9] N. E. Ouanjli, et al., “Contribution à l’optimisation des performances d’une Machine Asynchrone à Double
Alimentation (MADA) fonctionnant en mode moteur,” International conference TISPI, Oujda, 2016.
[10] M. Taoussi, et al., “The Fuzzy Control for Rotor Flux Orientation of the double-fed asynchronous generator
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[11] B. Bossoufi, et al., “Backstepping Adaptive Control of DFIG-Generators for Variable-Speed Wind Turbines,”
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BIOGRAPHIES OF AUTHORS
Najib El Ouanjli was born in 1988 in Fez, Morocco. In 2015, he received Master.Sp, in
Automated Industrial Systems Engineering, from Faculty of Sciences Fez University, Morocco.
Since 2012, he is professor of physics sciences in Fez. Currently, he is pursuing Ph.D in Electrical
Engineering at the Higher School of Technology, University Sidi Mohammed Ben Abdellah, Fez,
Morocco. His research interests include static converters, electrical motor drives and power
electronics, electrical machines control, renewable energy and artificial intelligence.
Aziz Derouich obtained his diploma from the Superior School of Technical Teaching of Rabat
1995. Further, he got his Diploma of Superior Studies (DESA) in Electronics, Automatic and
Information Processing in 2004 and the Ph.D. degree in computer engineering in 2011 from the
"University Sidi Mohamed Ben Abdellah" of Fez. In 2014, he obtained his diploma of Habilitation
Research from the Faculty of Science and Technology of Fez. He was a professor of Electricity
and Computer Science in "Lycée Technique, El Jadida" from 1995 to 1999 and in "Lycée
Technique, Fez" from 1999 to 2011. Since 2011, he is a Professor at the Higher School of
Technology, Sidi Mohamed Ben Abdellah University, Fez, Morocco. His research interests
include: Electrotechnical systems, static converters, electrical machines control, renewable energy
and Elearning.
11. IJPEDS ISSN: 2088-8694
Contribution to the Performance Improvement of Doubly Fed Induction Machine .... (Najib El Ouanjli)
1127
Abdelaziz El Ghzizal was born in 1959 in Fez, Morocco. He was obtained his PhD at the
university of Sciences and Technical of Montpellier in France. Member of laboratory of
Production engineering, energy and sustainable development, member of research team on Smart
Energy Systems and Information Processing. Research field: Multilevel inverters - Optimization of
the power extracted from Photovoltaic Panels – Smart networks. Currently, professor in electrical
engineering in the High School of Technology of Fez.
Youness El Mourabit was born in 1985 in Fez, Morocco. He received the Professional B. degree
in electronics and computer systems from Fez University, Morocco, in 2007 and M.Sp. degree in
Automated Industrial Systems Engineering, from Faculty of Sciences Fez University, Morocco, in
2010. Since 2012, he is professor of engineering sciences in Taza. His main research interests
include design and modeling of electrical machines, renewable energy systems and power system
control.
Badre Bossoufi was born in Fez city, Morocco, on May 21, 1985. He received the Ph.D. degree in
Electrical Engineering from University Sidi Mohammed Ben Abdellah, Faculty of Sciences,
Morocco and PhD. degree from University of Pitesti, Faculty of Electronics and Computer,
Romanie and Montefiore Institute of electrical engineering, Luik, Belgium, in 2013. He was an
Assistant Professor of Electrical Engineering, at the Higher School of technologie, Oujda
Morocco. His research interests include static converters, electrical motor drives, power
electronics, Smart Grid, Renewable Energy and Artificial Intelligent.
Mohammed Taoussi is a PhD student in Electrical Engineering at the Faculty of Sciences,
University Sidi Mohammed Ben Abdellah, Morocco. He received his Master in Industrial
Electronics from the Faculty of Sciences, Fez, in 2013. His research interests include static
converters, electrical motor drives, and power electronics, smart grid, renewable energy and
artificial intelligence.