Dissertations / Theses on the topic 'VECTOR CONTROLLED'
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Gulec, Mustafa Alpertunga. "Vector Controlled Elevator Drive." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607186/index.pdf.
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In this thesis, a practical vector controlled elevator drive is presented. Indirect vector control of induction machine is investigated in theory and then implemented. Control technique is compared with scalar control and induction machine is compared with dc motor. The operation of the system depends on induction machine parameters, so how to accurately and automatically obtaining of the parameters is also presented. Finally, the elevator system is introduced, the application of this control system to the elevator system is described and a basic elevator control system is simulated.
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Freere, Peter Andrew. "Current controllers for vector controlled permanent magnet synchronous motor drives." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357627.
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Armstrong, G. J. "Encoderless vector controlled induction motor drives." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246112.
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Bharadwaj, Aravind S. "Vector controlled induction motor drive systems." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172143/.
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Wade, Scott. "Parameter identification for vector controlled induction machines." Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/1311.
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Chuang, Tzu-Shien. "A variable structure space voltage vector controlled switched reluctance flux vector drive." Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/106984/.
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Through simulation and experimental investigation this thesis shows that (i) the switched reluctance motor is not different from any other motor in energy conversion theory but the difference is only in the structure and the operating characteristics; (ii) under high loads or high speeds the relative phase angle of the current with respect to the rotor pole must be advanced; (iii) the kinetic energy in the motor can be quickly returned to the d.c. link source or be transferred to other phase windings by the regenerative operation. A synchronous singly-excited control scheme is introduced to the switched reluctance motor. By this technology, a conventional current chopper can be used but the operating phase angle of the excited phase current must be limited. This approach makes the traditional switched reluctance drive become a high performance vector drive but a complex coordinate transformation is unnecessary making the implementation very simple. For multiply excited operation and for high power requirements, in order to achieve the sliding mode control of total phase power, a space vector controlled split-link converter is accomplished. A sliding mode speed controller with d.c. link power feedforward is added to the variable structure space vector controlled split-link converter to achieve a robust servo drive. The proposed switched reluctance drive can achieve fast and robust servo performance even under a high load and highly dangerous electric braking conditions.
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Acar, Akin. "Implementation Of A Vector Controlled Induction Motor Drive." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.
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High dynamic performance, which is obtained from dc motors, became achievable from induction motors with the recent advances in power semiconductors, digital signal processors and development in control techniques. By using field oriented control, torque and flux of the induction motors can be controlled independently as in dc motors. The control performance of field oriented induction motor drive greatly depends on the correct stator flux estimation. In this thesis voltage model is used for the flux estimation. Stator winding resistance is used in the voltage model. Also leakage inductance, mutual inductance and referred rotor resistance values are used in vector control calculations.
Motor control algorithms use motor models, which depend on motor parameters, so motor parameters should be measured accurately. Induction motor parameters may be measured by conventional no load and locked rotor test. However, an intelligent induction motor drive should be capable of identifying motor parameters itself.
In this study parameter estimation algorithms are implemented and motor parameters are calculated. Then these parameters are used and rotor flux oriented vector control is implemented. Test results are presented.
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Sünter, Sedat. "A vector controlled matrix converter induction motor drive." Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/12965/.
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This thesis concerns the design and construction of a closed-loop controlled matrix converter induction motor drive, using transputer parallel processors. The modulation algorithms used for the matrix converter are described. A 2.5 kW experimental matrix converter using IGBT switching devices has been constructed and tested. An analysis of the losses in the converter has been carried out and this gives good agreement with the measured losses. Two modulation algorithms, the Venturini algorithm and the scalar algorithm have been implemented in real-time on a network of parallel transputer processors. Experimental results are presented to compare the operation of these two algorithms. Open-loop constant V/F control of the matrix converter induction motor drive has been demonstrated. A controller has been designed to achieve closed-loop speed control of the drive system, employing the slip regulation technique. The experimental results under various operating conditions have verified the correct operation of both control systems. The indirect vector control technique has also been implemented. The results demonstrate the steady-state and transient performance as well as the regenerative operation of the drive system. The application of a matrix converter to a high performance induction motor servo drive rated at 2.5 kW with true four quadrant capability and minimum passive components has been demonstrated.
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Sumner, M. "Vector controlled induction motor drive using transputer parallel processors." Thesis, University of Nottingham, 1990. http://eprints.nottingham.ac.uk/14104/.
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This thesis describes the design and construction of a high performance induction motor drive, controlled by a network of parallel (INMOS) Transputer processors. The flexibility and high computational ability of the controller is demonstrated by the implementation of three forms of indirect vector control for the induction motor (here termed "V-Type, "V-Type with Current Feedback" and "I-Type") on two motor drive rigs. Results show that V-Type control with current feedback is superior, and that on-line parameter estimation (namely the rotor time constant) is required. The controller has been expanded to incorporate two parameter identification strategies for assessment. The first, termed "Reactive Power Measurement", has proved successful in matching the controller value of rotor time constant to the actual machine value of rotor time constant. The second, termed "PRBS Injection with Cross- Correlation" has proved inconclusive and is the subject of on-going research. The performance of the transputer parallel processing network for real time control is discussed. This assessment is felt to be significant since parallel architectures are likely to become increasingly exploited as the processors become cheaper, more powerful and flexible, and with enhanced system support.
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Ungku, Amirulddin Ungku Anisa. "Analysis and simulation of vector controlled bearingless induction motors." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/14308/.
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The concept of bearingless motors, which combine both motoring and rotor bearing capabilities, is appealing especially in high speed and high power machine applications. Although extensive research has been carried out on permanent magnet and reluctance types of bearingless motors, studies on the induction motor type are less successful. This thesis addresses the bearingless induction motor based on the concept of dual-pole windings, one controlling the motor torque and the other the generated radial forces. A modelling approach is undertaken to investigate the effect of induction machine design on radial force generation and motor levitation under both steady state and transient conditions. The simulation is based on the dynamic reluctance mesh model embedded in vector control systems for the decoupled control of torque, flux and radial force. This is achieved through modification of a previously developed computer software for modelling induction motors in order to model the control of bearingless induction motors. Both the squirrel cage and wound rotor induction motors are investigated and their suitability for generating controlled bearing relief forces assessed. Vector control schemes for the bearingless cage and wound rotor induction motors were also designed and simulated. A mixed field oriented vector control scheme, which incorporates the simple rotor field orientation for motoring control and an airgap field orientation for rotor levitation control, is introduced and found to be advantageous in bearingless induction motor control. Apart from investigating totally bearingless conditions, the study also investigates bearing relief capabilities for a vector controlled cage and wound rotor induction motor in which the rotor movement is restricted by bearings but with the bearing load cancelled by suitably directed radial force. The effects of real winding topologies, stator and rotor slotting and iron saturation on the performance of bearing relief and bearingless induction motors are also presented. Finally, suggestions for future work is included In order to further investigate bearingless induction motors and its applications.
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Wang, Mingyu. "Parameter variation effects in sensorless vector controlled induction machines." Thesis, Liverpool John Moores University, 1999. http://researchonline.ljmu.ac.uk/5021/.
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Goosen, Richard F. "Terrain elevation determination using a microprocessor controlled vector map." Ohio University / OhioLINK, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1184003160.
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Ertek, Talip Murat. "Speed Estimation Techniques For Sensorless Vector Controlled Induction Motor Drive." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606863/index.pdf.
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This work focuses on speed estimation techniques for sensorless closed-loop speed control of an induction machine based on direct field-oriented control technique. Details of theories behind the algorithms are stated and their performances are verified by the help of simulations and experiments.
The field-oriented control as the vector control technique is mainly implemented in two ways: indirect field oriented control and direct field oriented control. The field to be oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented control no flux estimation exists. The angular slip velocity estimation based on the measured or estimated rotor speed is required, to compute the synchronous speed of the motor. In the direct field oriented control the synchronous speed is computed with the aid of a flux estimator. Field Oriented Control is based on projections which transform a three phase time and speed dependent system into a two co-ordinate time invariant system. These projections lead to a structure similar to that of a DC machine control. The flux observer used has an adaptive structure which makes use of both the voltage model and the current model of the machine.
The rotor speed is estimated via Kalman filter technique which has a recursive state estimation feature. The flux angle estimated by flux observer is processed taking the angular slip velocity into account for speed estimation. For closed-loop speed control of system, torque, flux and speed producing control loops are tuned by the help of PI regulators. The performance of the closed-loop speed control is investigated by simulations and experiments. TMS320F2812 DSP controller card and the Embedded Target for the TI C2000 DSP tool of Matlab are utilized for the real-time experiments.
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Shirsavar, S. A. "Parameter and speed estimation for vector controlled induction motor drives." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263045.
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Li, Jian. "Implementation and simulation of various vector controlled induction motor drives." Thesis, University of Aberdeen, 1995. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU083755.
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The development of AC drives has gained momentum with the advancement of power electronic devices, control theory and technology of microprocessors. Based on high speed digital signal processing theory and power transistor hardware, two axis machine model and adaptive control techniques, a vector controlled fully digital induction motor drive is a high performance, low cost drive which is becoming increasingly popular in many industrial applications in all power ranges and will succeed the dc drive in the near future. The main goal of the thesis is to investigate the various forms of implementations of vector controlled digital signal processor based high performance induction motor drives. For this purpose, a TMS320C30 digital signal processor board with transducer and interfacing circuits has been designed, manufactured and built. Furthermore a conventional bipolar transistor inverter has been modified and interfaced to the DSP board. The entire hardware has been tested and successfully implemented. The control software is versatile and provides a platform for implementing various control configurations. The first part of the thesis reviews the development of various vector controlled drives; different mathematical models are presented and discussed together with digital simulation results of different vector controlled schemes. Intelligent control algorithms based on neural networks, fuzzy control, self-tuning control are also considered, some of them are tested by using real-time simulation or on a real drive. Different PWM strategies are investigated and compared, and a versatile and reliable real-time PWM algorithm is generated and integrated into the drive control software. Various parameter identification and auto-commissioning techniques are included in the control software. Details of experimentally obtained results for various vector drives are presented.
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Altuntas, Mehmet. "Mmic Vector Modulator Design." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605684/index.pdf.
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In this thesis the design of a MMIC vector modulator operating in 9GHz-10GHz band is investigated and performed. Sub-sections of the vector modulator are 4-port (4.8dB) 1200 phase shift relative to the dedicated port power splitter, digitally controlled variable gain amplifier and the in phase power combiner.
Alternative methods are searched in order to implement the structure properly in the given frequency band. The final design is appropriate for MMIC structure.
4-port (4.8dB) 1200 phase shift relative to the dedicated port power splitter is studied. The performance is simulated and optimized first on Microwave Office, then on Advanced Design System (ADS) tools.
Various methods to design a digitally controlled variable gain amplifier are studied. The final topology is simulated and optimized on ADS tool.
An in phase power combiner is designed. The performance of the combiner is simulated and optimized on ADS tool.
Lumped element models are replaced with CASWELL H-40 models to achieve a MMIC structure and a layout is drawn. The finalized vector modulator is simulated and optimized on ADS tool.
Key words: MMIC, Vector Modulator, Digitally Controlled Variable Gain Amplifier, Layout
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Mao, Shenjian. "On-line parameter identification of induction machines for vector controlled drives." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312878.
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Purcell, Anthony. "New switching techniques for direct torque controlled induction motor drives." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285275.
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Kanekal, Ramesh V. "Modeling, simulation and analysis of an indirect vector controlled induction motor drive." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/76443.
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Vector control technique is being widely used in ac motors drives for precise dynamic control of torque, speed and position. The application of vector control scheme to the induction motor drive and the complete modeling, analysis and simulation of the drive system are presented in this thesis. State space models of the motor and the speed controller and the real time models of the inverter switches and the vector controller are integrated to model the drive. Performance differences due to the use of PWM and hysteresis current controllers are examined. Simulation results of the torque and speed drive systems are given. The drive system is linearised around an operating point and the small signal response is evaluated.Master of Science
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Dalal, Dhaval B. "A novel parameter compensation scheme for indirect vector controlled induction motor drives." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101179.
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Indirect vector controlled induction motor drives are gaining acceptance because they allow the induction motor to be controlled like a separately excited dc motor, i.e. they achieve decoupling of torque and flux producing currents. But, the effectiveness of these drives is lost as they are highly parameter sensitive. Studies have indicated that the decoupling of the torque and the flux channels is lost when machine parameters change with temperature, saturation, etc. Many schemes have been proposed to overcome these parameter sensitivity effects. But most of these schemes themselves are parameter-dependent and hence inapplicable to high precision control applications. A new parameter compensation scheme which uses air gap power equivalence for sensing parameter changes is developed in this thesis. It is shown that this scheme is independent of key motor parameters and requires no additional transducers for implementation.M.S.
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Konghirun, Mongkol. "Fast-transient current control strategy and other issues for vector controlled ac drives." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1070302487.
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Abdelsalam, Ahmed Kadry Ahmed. "Medium-voltage PWM indirect vector controlled induction motor drive with a long motor feeder." Thesis, University of Strathclyde, 2009. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21996.
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This thesis studies two types of medium-voltage (MV) vector controlled PWM induction motor drives for long motor feeder applications, namely voltage source and current source based drives. As rectifiers and inverters are the main elements in any drive system, both are investigated, but with more emphasis on the inverter side. MV PWM current source rectifiers (CSR) usually use selective harmonic elimination as a modulating strategy which provides good harmonic reduction at a low switching frequency. The rectifier performance does not meet the IEEE 519 regulation concerning harmonics injected into the supply current. Two solutions are presented. First, line side passive filters for harmonic mitigation and power factor improvement. Second, shunt active power filters based on p-q theory, with a step-down high-frequency transformer. The presented solutions are compared to highlight their features and limitations. Several topologies can be used for PWM CSRs. A detailed study of the selection criteria for PWM CSR semiconductors is presented based on losses, physical size, and number of series devices. Utilization of a PWM voltage source inverter (VSI) drive system in long motor feeder applications leads to motor terminal over-voltage problems. Surge filters are used to mitigate this phenomenon. Among the various types of filters, the motor terminal RC filter and the inverter output RLC filter are common. A detailed investigation is presented of the effects of these filters on the VSI drive system. PWM current source inverter (CSI) drive systems are characterised by their motor friendly voltage behaviour and controlled short circuit capabilities. Therefore, a proposed indirect vector controlled PWM CSI drive is presented for long motor feeder applications. Performance comparison between PWM VSI and CSI drive systems for long motor feeder applications is performed to clarify features and limitations of each system. Motor voltage is needed for speed estimation but measurement of voltage/speed is impractical for long motor feeder drives. A model reference adaptive system speed estimator is proposed with a novel remote motor voltage calculator that depends on the inverter voltage and feeder parameters. Offset and drift problems that occur during the flux estimation process are solved by a proposed DC-offset eliminator.
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Lee, Bong-ha. "Active power system compensator with fuzzy vector controller." Thesis, Queensland University of Technology, 2002. https://eprints.qut.edu.au/36152/1/36152_Lee_2002.pdf.
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Active power compensation of reactive power and harmonic distortion caused by non-linear loads can be achieved by using a current controlled, voltage-source
inverter based compensator. The compensation technique used injected waveform control along with vector control based on instantaneous power theory allows a general purpose inverter based compensator to perform full
compensation of var, power factor and harmonic distortion and other non-linear components. Dr. Keith Hoffman has developed an instantaneous control algorithm capable of
eliminating harmonics and calculating the in-phase fundamental load current needed to supply the real power at the same time. The application of his technique to a new 'Switch State Coarse Fuzzy Vector Controller' is discussed in detail as well as the operation of the experimental system. The author has also
developed a compensator system that exhibits accurate control by using the instantaneously determined reference current compared with the supply current directly rather than using compensator current control as in previous methods. In microprocessor control applications, the power semiconductor switching speeds of a compensator is limited by the microprocessor calculation times. It is
demonstrated that simplifying the control circuit using a vector controller and reducing logic calculation times using coarse fuzzy logic control can be an effective and simple technique utilising both microprocessor and analogue based calculations. Two types of controller where investigated with one being a microprocessor-based fuzzification and the other an analogue comparator-based
fuzzification, are demonstrated and compared with each other. Results from the undertaken experiments show practical relevance of the developed instantaneous reference current vector calculator and 'Switch State
Coarse Fuzzy Vector Controller'. Useful techniques that integrate fuzzy control theory with conventional and modem control algorithms and switching strategies
are discussed in detail.
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Rattanaprasert, Monchaya. "Construction of a Nisin-Controlled Expression Vector, a Derivative of pMSP3535 for Alternative Selectable Marker." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1253160902.
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Bawana, Niyem Mawenbe. "Thermal Response in a Field Oriented Controlled Three-phase Induction Motor." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7740.
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The research conducted at the department of Electrical Engineering of the University of South Florida campus in Tampa only covers the electrical aspect of electric drives. However, the performance of electric machinery is significantly impacted by temperature variation. The
literature review shows three main control techniques in use today in electric drives namely, Scalar control, Direct Torque control and Field Oriented control.
This thesis presents a temperature rise of rotor bars, stator winding, stator core and stator frame in a running three phase field-oriented controlled induction machine. A literature search shows that none of research has been carried out to investigate a thermal response of a field-oriented controlled induction motor. With this motivation, we were able to implement a lumped parameters thermal model of a three-phase field-oriented IM in MATLAB Simulink, which allows us to determine that rotor bars have the highest temperatures rising to 84 degrees Celsius. This confirms that rotors bars are the hottest part of a running IM as stipulated in literature.
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Buyukkeles, Umit. "Improved Torque And Speed Control Performance In A Vector-controlled Pwm-vsi Fed Surface-mounted Pmsm Drive With Conventional P-i Controllers." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614294/index.pdf.
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In this thesis, high performance torque and speed control for a surface-mounted permanent magnet synchronous machine (PMSM) is designed, simulated and implemented. A three-phase two-level pulse width modulation voltage-source inverter (PWM-VSI) with power MOSFETs is used to feed the PMSM.
The study has three objectives. The first is to compensate the voltage disturbance caused by nonideal characteristics of the voltage-source inverter (VSI). The second is to decouple the coupled variables in the synchronous reference frame model of the PMSM. The last is to design a load torque estimator in order to increase the disturbance rejection capability of the speed control. The angular acceleration required for load torque estimation is extracted through a Kalman filter from noisy velocity measurements.
Proposed methods for improved torque and speed control performance are verified through simulations and experimental tests. The drive system is modeled in Matlab/Simulink, and control algorithms are developed based on this model. The experimental drive system comprises a three-phase VSI and a 385 W surface-mounted PMSM. Control algorithms developed in the study have been implemented in a digital signal processor (DSP) board and tested comprehensively. With the use of the proposed methods, a considerable improvement of torque and speed control performance has been achieved.
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Wung, Peter Yu-Pu. "Operating point dependent modeling of synchronous reluctance motors and its implication on vector controlled motor performance." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15042.
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Ditto, Andrew. "DNA-LPEI complexes encapsulated in LTP nanospheres as a non-viral gene therapy vector." Akron, OH : University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1165596983.
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Thesis (M.S.)--University of Akron, Dept. of Biomedical Engineering, 2006."December, 2006." Title from electronic thesis title page (viewed 12/31/2008) Advisor, Yang Yun; Committee members, Stephanie Lopina, Steven Schmidt; Department Chair, Daniel Sheffer; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Bennett, Nicholas. "A vector controlled AC drive incorporating an ultrasonic voltage source inverter and a permanent magnet synchronous machine." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240472.
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Strobel, Benjamin [Verfasser]. "Modeling pulmonary fibrosis by AAV-mediated TGFβ1 Expression : a proof of concept study for AAV-based disease modeling and riboswitch-controlled vector production / Benjamin Strobel." Konstanz : Bibliothek der Universität Konstanz, 2016. http://d-nb.info/1158496273/34.
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Opperman, Tjaart Adriaan Kruger. "A 5 GHz BiCMOS I/Q VCO with 360° variable phase outputs using the vector sum method." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-04082009-171225/.
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Thesis (M.Eng.(Microelectronic Engineering))--University of Pretoria, 2009.Includes summaries in Afrikaans and English. Includes bibliographical references (leaves [74]-78). Mode of access: World Wide Web.
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Healey, Russell Cameron. "Advanced induction motor models for vector controllers." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337900.
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Chang, Kuang-Yuan, and 張廣元. "Controller Tuning for Vector-Controlled Induction Motor Drives." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/87765522089398234158.
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碩士國立台灣工業技術學院
電機工程技術研究所
85
This thesis investigates the controller parameter tuning method for both a closed-loop vector-controlled and a sensorless vector-controlled induction motor drives. Asystemmatic procedure based on root-locus and frequency renponse techniques is proposed to tune the controller parameters. The thesis also proposes the design of a rotor flux observer for improving the low-speed performance of sensorless vector-controlled drive. In hardware implementation the 80196MC single-chip micro- processor is used for control software development. In estimatingthe rotor flux, the actual stator voltages are not measured, insteadthe stator voltage commands are used. The cost of the system isreduced since no voltage sensor is used for stator voltage sensing.Also, the rotor flux is estimated using the rated flux value and alow-pass filter so as to compensate the deviation caused by theintegrator during low-speed operation. Adeadtime compensationcontrol board is added to the hardware, which results in goodperformance during low speed with loads. The experimental results show good performance for both the closed-loop and the sensorless vector-controlled drives under no-load and loading conditions at various speeds.
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Kuang-Yuan, Chang, and 張廣元. "Controller Tuning for Vector-Controlled Induction Motor Drives." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/21287027134531243267.
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碩士國立臺灣科技大學
電機工程技術研究所
86
This thesis investigates the controller parameter tuning method for both a closed-loop vector-controlled and a sensorless vector-controlled induction motor drives. Asystemmatic procedure based on root-locus and frequency renponse techniques is proposed to tune the controller parameters. The thesis also proposes the design of a rotor flux observer for improving the low-speed performance of sensorless vector-controlled drive. In hardware implementation the 80196MC single-chip micro- processor is used for control software development. In estimatingthe rotor flux, the actual stator voltages are not measured, insteadthe stator voltage commands are used. The cost of the system isreduced since no voltage sensor is used for stator voltage sensing.Also, the rotor flux is estimated using the rated flux value and alow-pass filter so as to compensate the deviation caused by theintegrator during low-speed operation. Adeadtime compensationcontrol board is added to the hardware, which results in goodperformance during low speed with loads. The experimental results show good performance for both the closed-loop and the sensorless vector-controlled drives under no-load and loading conditions at various speeds.
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Wang, Chin-Li, and 王進力. "PID Controller Tuning for Vector-Controlled Induction Motor Drivers." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/80550319879059326660.
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碩士淡江大學
電機工程學系
89
Title of Thesis Total pages:64 PID Controller Tuning for Vector-Controlled Induction MotorDrivers Key word: Proportional-Integral-Derivative, performance index, Simulated Annealing Name of Institute: Graduate Institute of Electrical Engineering, Tamkang University Graduate date:July,2001 Degree conferred:Master Name of student: Wang Chin-Li Advisor:Dr.Ying-Tung Hsiao 王 進 力 蕭 瑛 東 博 士 Abstract: Proportional-integral-derivative (PID) controller is a well-known technique for industrial control processes. This is due to its simple structure and robust performance in a wide range of operating conditions. The design of such a controller requires specification of three parameters: proportional gain (Kp), integral time constant (Ki), and derivative time constant (Kd), Traditionally, the problem has been handled by a trial and error approach. Design engineers must tune PID controllers manually and usually take considerable time. This work presents a optimal approach to design PID controllers. The problem formulation of the design PID controller adopts four performance index maximum overshoot, rise time, setting time and integral absolute error as the objective. Moreover, we propose a solution algorithm based on the simulated annealing technique to determine the controller parameters for getting a well performance for a given plant. Simulation results demonstrate that better control performance can be achieved in comparison with Ziegler-Nichols method.
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Marapally, Prasanth. "Space Vector Controlled PMSM Drive Based on Fuzzy Logic Controller." Thesis, 2017. http://ethesis.nitrkl.ac.in/8943/1/2017_MT_MPrasanth.pdf.
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To improve the dynamic performances of Permanent Magnet Synchronous Motor (PMSM) drive, a novel implementation of speed controller based on adaptive fuzzy logic is presented in this project. Using the output of the fuzzy speed controller (FC), the quadrature axis current reference value can be obtained.
The basic principle of vector control is to decouple the stator current to get direct axis and quadrature axis components. The vector control strategy is formulated in the synchronously rotating reference frame. The steady-state response of the predictive control can be effectively improved by using a simple time delay control approach. To increase the performances of PMSM drive, an adaptive speed controller based on fuzzy logic is proposed. The availability of the PMSM parameters is confirmed by computer simulations. The results of simulation have shown that the PMSM drive with the proposed control scheme has the merits of simple structure, robustness, quick tracking performance.
In this project, the conventional PI speed controller has been replaced by the fuzzy controller. It combines the capability of fuzzy reasoning in handling uncertain information and the ability to compensate of the disturbance voltage observer on-line. The proposed control scheme has been testified by simulation, the results indicate the PMSM drive with the adaptive fuzzy controller will have the ability of quick recovery of the speed from any disturbances and parameters variation. Accordingly, the proposed PMSM drive will have better dynamic performances and robustness.
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Yang, Hui-tsung, and 楊慧聰. "A Design of Fuzzy Speed Controller for Sensorless Vector-Controlled Inverter." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/82772535234866224635.
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碩士國立臺灣科技大學
電機工程系
87
The purpose of this thesis is to design a fuzzy PID speed controller based on fuzzy logic theory for a sensorless vector-controlled induction motor drive system. First, the control rule table of numerical value is constructed by using natural control laws. Then, the torque command is calculated according to the speed error and the change of speed error by using fuzzy inference rules. We also propose a speed estimator by the full order state observer based on adaptive control theory. The proposed scheme uses the state observer which can allocate poles arbitrarily. Therefore, it can be applied to the direct field-oriented control, even in a low speed range. Experiments are setup by a PC-based visual module to inverter to evaluate the effectness of the proposed method. The experimental results demonstrate that the fuzzy PID meets a high performance and robust control system. The design of fuzzy controller does not require accurate mathematical model of system, so it is easy to implement.
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ARORA, JALAJ. "EFFICIENCY OPTIMIZATION OF VECTOR CONTROLLED INDUCTION MOTOR DRIVE." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15291.
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Induction motors are widely used in domestic, commercial and industrial application. About 80% of the auxiliaries used in thermal power plant are induction motors. And, in households almost all rotating machines are induction motors. Most of the applications of induction motors (IMs) are based on variation in speed according to the load demand. Induction machines are non linear machines and there exist high dynamic interactions. Hence, in order to emulate it as separately excited DC motor, vector control technique is used as this method removes the coupling effects (using a frame of reference like synchronous, stationary) which makes the response sluggish. Traditionally, PI controllers are generally used in order to control the speed but tuning is somewhat time consuming as values have to be changed every time when parameters are changed. In order to avoid this fuzzy controllers are used. Also, induction motors consume a major part of the total electrical energy production. Therefore, improving the efficiency of the induction motor is always been a major concern. Various essential strategies are adopted to ensure optimum efficiency operation of induction motor drive. This is usually realized either by selecting proper control strategies or by improvement in the design, materials and construction techniques or both. Design aspects involve shaping of rotor bars, use of copper material instead of aluminium, etc. The control strategies adopted to optimize the efficiency are search controller and loss model controller. Search controller method is a feedback method that finds maximum efficiency by adopting a search technique. The value of efficiency at a particular sampling instant is compared with the efficiency value of previous sampling instant and necessary control action is executed accordingly. Loss model controller depends on motor parameters because it is based on the modelling of the motor and losses to derive an objective function, which is optimized to yield maximum efficiency. Machines are designed to operate at rated flux because if gives fast transient response and high torque to ampere ratio. If rated flux is maintained at light loads, then core losses of the machine will be excessively high which will result in reduced efficiency. Here, loss model control technique will be used to reduce the losses and increase the torque per ampere ratio by making rated flux as increasing function of load.
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Jair, Ruey-Ynan, and 翟瑞元. "DESIGN OF AN ADAPTIVE SPEED CONTROLLER FOR VECTOR-CONTROLLED INDUCTION MOTOR DRIVES." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/21054910688295177514.
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碩士中正理工學院
電機工程研究所
86
A systematic design method of PI controller for vector-controlled induction motor drives is investigated in this thesis. In order to deal with the parameter variation of the induction motor and load torque disturbance, a model reference adaptive controller which based on Lyapunov stability theorem is proposed to control the speed of induction motor. The results show that the speed control performance of the adaptive controller is better and more robust than the traditional PI controller. In hardware implementation the actual stator currents and rotor speed signals are used, and the control software is developed on the personal computer by Turbo C program language. The experimental results show good performance for model reference adaptive controller under no-load and loading conditions at various speeds.
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Jain, Jitendra Kumar. "Stability Analysis and Robust Controller Design of Indirect Vector Controlled Induction Motor." Thesis, 2017. http://ethesis.nitrkl.ac.in/9376/1/2017_PhD_JKJain_512EE1010.pdf.
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The thesis considers stability analysis and controller design through different performance measures for indirect vector controlled induction motor (IVCIM).These problems are known to be complex due to nonlinearity, large order and multi-loop scenario. Some new approaches and results on IVCIM are proposed in this work.
IVCIM dynamics is well known for having different bifurcation behavior, viz., saddle-node, Hopf, Bogdanov–Takens and Zero–Hopf bifurcations due to rotor resistance variation. These bifurcations affect the control performance and may lead to stalling or permanent damage of motor. A numerical analysis of these bifurcations for proportional integral (PI) controlled IVCIM is made in this thesis using full-order induction motor model (stator dynamics is included). This analysis aids to determine the allowable bifurcation parameter variation range as well as suitable choice of speed-loop gains to avoid these. Some new observations on the bifurcation behavior are made. Simulation and experimental results are presented validating the bifurcation behaviors.
For improving dynamic performance in the presence of load torque and rotor resistance variation, a new method for designing PI gains is proposed for IVCIM. The inner-loop current PI controllers are tuned simultaneously along with the speed controller. This method is implemented using a static output feedback scheme in which iterative linear matrix inequality (ILMI) based𝐻∞control technique is employed. Such a design makes stator currents and speed response to be robust against rotor resistance and load variations. A comparison between proposed design and a conventional one is shown using simulation and experimental results that validate the superiority of the proposed approach.
Owing to multi-loop and nonlinear system behavior, IVCIM dynamics is known to have coupling in between the two inner-loop stator current components (flux and torque). Such coupling affects the dynamic torque output of the motor. Decoupling of the stator currents are important for smoother torque response of IVCIM. Conventionally, additional feedforward decoupler is used to take care of the coupling that requires exact knowledge of the motor parameters and additional circuitry or signal processing. A method is proposed to design the regulating PI gains while minimizing coupling without any requirement of additional decoupler. The variation of the coupling terms for change in load torque is considered as the performance measure. The same ILMI based𝐻∞control design approach is used to obtain the controller gains. A comparison between the conventional feedforward decoupling and proposed decoupling scheme is presented through simulation and experimental results that establish the effectiveness of the proposed method riding over its simplicity.
Finally, since the PI controller can yield limited performance, a dynamic controller is designed for the IVCIM drive system. In the design process, iron-loss dynamics are incorporated into induction motor model to fetch benefit through better performance. A sequential design method is used for the controller design in which, first, the inner-loop controllers are designed. The designed inner-loop controllers is then used for designing the outer speed-loop controller. The proposed design employs ILMI based𝐻∞control design for dynamic output feedback controller that makes stator currents and speed response to be robust against disturbances. A comparison among proposed dynamic controller design, PI controller and compensator design is shown using simulation and experimental results demonstrate enhanced performance of the proposed controller and suitability for industrial purpose.
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Singh, Brij Nandan. "Investigation on vector controlled induction motor drive." Thesis, 1995. http://localhost:8080/xmlui/handle/12345678/5511.
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Liao, Guan Wei, and 廖冠瑋. "Design of Robust Fractional Order PID Controller for Vector-Controlled Induction Motor Drives." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/16498544564762173564.
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碩士長庚大學
電機工程學研究所
96
The main propose of this thesis is to design a robust fractional-order PID speed controller for vector-controlled induction motors, where possible parameter variations, load disturbance and model uncertainties are considered. The required parameters of the fractional-order PID controller can be obtained by utilizing Matlab optimization toolbox, in which phase margin, gain crossover frequency, high-frequency noise and low-frequency disturbance rejection are performance of concern. In the analysis and design of robustness, an equivalent rational model of fractional-order PID is adopted, while in the stage of implementation, an equivalent discrete model is utilized. In the thesis, simulations are performed by Matlab/Simulink, and a DSP/FPGA-based experimental platform is used for experiment verification. From simulation and experimental results, compared to the conventional PID controller, the proposed robust fractional-order PID controller can provide better control performance subject to parameters variations and load disturbances.
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Chou, Wei-Kuei, and 周煒貴. "Design of a Grey Twin Sliding Mode Controller for the Vector-Controlled System." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/60597207844972469944.
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碩士國立臺北科技大學
機電整合研究所
90
In this study, a grey twin sliding mode controller (GTSMC) combines the grey prediction theory and the sliding mode control theory. GTSMC is proposed in the vector-controlled system of induction motors. Due to a grey prediction controlled predicts the error of the rotor speed and the error convergences to zero by sliding mode controlled. Due to the flux observer of voltage model does not use rotor inductance, therefore, the rotor inductance is better compared to stator inductance and mutual inductance by the effect of system parameters. Experiment results demonstrate that the dynamic performance of the GTSMC is better compared to that of the conventional proportional plus integral controller (PI). Moreover, the adaptability of the GTSMC is robust which is suited for a controller of high performance vector-controlled system.
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"IMPLEMENTATION OF A VECTOR CONTROLLED INDUCTION MOTOR DRIVE." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.
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Chang, Cheng-kuan, and 張正寬. "Implementation of DSP-Based sensorless vector-controlled inverter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/95092253398892292096.
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碩士國立臺灣科技大學
機械工程系
89
The purpose of this thesis is to investigate a sensorless vector-controlled inverter. The control algorithm is based on the rotor field-oriented indirect sensorless vector control theorem. It’s due to the voltage decoupling control of rotor field-oriented vector control and control at low speed control of indirect vector control are easy to realize. The realization of sensorless vector control can not only reduce cost but also increase the robustness of the system. There are many ways to estimated rotor speed. Here, we use the power reactive model reference adaptive system associated with the PI controller, which tunes the estimated rotor speed such that the reactive power generated by adaptive model matches that generated by reference model. The experimentation platform is TI DSP F240 evaluation board which produces the PWM signals to drive the industrial power board for a 1-HP induction motor. The pulse width modulation theorem is voltage space vector pulse width modulation. Besides, the control programs are seized on the TI software library based on per unit system to realize the digitalized system. According to the experiment results, we prove the above theorem.
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Wang, Ming-Fuh, and 王明富. "Implementaion of a DSP-based Vector-Controlled Inverter." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/52457840921163597849.
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碩士國立臺灣科技大學
電機工程研究所
82
A vector-controlled inverter is proposed for ac induction speed control drivess by using a digital signal processor (TMS320C/ E14). In the digital controller, the d-q model,indirect field oriented vector control algorithm and synchronous reference frame theory are employed to transform the highly nonlinear dynamic system into a simplier decoupled dc-like machine and both the current and the speed controller dessign can be easily done in frequency domain. The PWM generator algorithm of vector-controlled inverter adopted the voltage space vectors algorithm. It was shown that sinusoidal modulation generated in ace vector representation has the advantages of low harmonics . A possibly high modulation index compared with the SPWM method. the dynamic of the inverter is both simulated by using the SIMNON program and implemented in TMS320C14 assembly language. In the experiment, the effect of "dead time" is also investigated based on the output voltage waveforms of a bridge inverter using voltage space vector PWM. The results show that the dead time causes a reduction in the fundamental component of the output voltage and introduces low order harmonics. Methods for compensating the dead time are then proposed and implemented in hareware.
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Lu, Ming-Sheng, and 呂明憲. "Rotor Flux Observers for the Vector-Controlled Inverters." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/89030240241951024078.
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NAN, TSAI YU, and 蔡育南. "Design of a Fuzzy Grey Prediction Controller for an Induction Motor Vector-controlled Drive." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/48754750599377626067.
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碩士國立臺北科技大學
機電整合研究所
88
The grey system theory can not only improve system’s response, but also predict the tendency of its variation. Therefore, it has a control and prevention ability in advance. It has been widely applied on varieties of fields, and has good effects on climate, earthquake, military and prediction control. However, the drawback of the conventional grey prediction controller is its fixed prediction step size. The smaller the step size, the faster the response but with larger overshoot. The larger the step size, the slower the response. By combining fuzzy and grey prediction theory, an appropriate prediction step size can be obtained for compensation. Therefore, the effectiveness of the proposed scheme is better than the conventional PI controller and the grey prediction controller with fixed prediction step. Three types of fuzzy prediction controllers were studied in this project. One is the linearlized fuzzy grey prediction controller (LFGPC), which combines the linearlized grey model and fuzzy theory. Another is the intensive fuzzy grey prediction controller (IFGPC), which combines the intensive grey model and fuzzy theory. The other is the difference fuzzy grey prediction controller (DFGPC), which combines the difference grey model and fuzzy theory. We simulated and analyzed a third-order system to verify the feasibility of the above three controllers. In addition, we applied them to the three-phase induction motor speed control system in order to prove their practicability. Experiment results closely meet the computer simulation results. Their performances are better than PI controller’s whose robust adaptability make them suitable for vector control systems of induction motors.
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Pan, Tsu-Huang, and 潘祖皇. "Design of a Fuzzy Grey Prediction Controller for Reduced-Order Adaptive Vector-Controlled System." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/41394245587688034073.
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碩士國立臺北科技大學
機電整合研究所
90
The fuzzy grey controller combines grey prediction and fuzzy theory can dynamic adjusting the prediction step. The FGC can improve the drawback of the conventional grey prediction controller with the fixed prediction step size and the system exhibits good dynamic response. The drawback of full order flux observer is the location of pole assignment need to follow the speed command. In his paper used reduced order flux observer to improve this problem. Base on model reference adaptive system (MRAS), design parameter adapter, the parameter of flux observer can be corrected. Which restrains the affection of system’s parameter variation and improves the robustness of the adaptive vector control system, according Lyapounov theory, we design speed observer can be a sensorless vector control. Intensive fuzzy grey prediction controller applies to speed sensorless adaptive vector control system. The experiment results show that with the proposed IFGPC and reduced order observer the dynamic characteristic of the vector control system can be improved.
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Li-Chun, Liu, and 劉立群. "A Speed Observer for Vector-Controlled Induction Motor Drive." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/18191609887426742445.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
87
The purpose of this thesis is to investigate the application of the model reference adaptive system (MRAS) for the sensorless vector-controlled induction motor drive. According to the basic scheme of the model reference adaptive system, we can consider the induction motor as a reference model and the full-order observer as an adjustable model. The rotor speed, treated as a parameter of adjustable model, can be estimated by the state error between the reference model and adjustable model. Simultaneously, the rotor flux can be obtained from full-order observer. The approach is verified to be hyperstable with Popov''s criterion. In the experimental setup, the control program is developed on the PC-Based Motor Controller Development System. First, MATLABO and SIMULINKO are used for computer-aided design and system simulation. Then, the Real-Time WorkshopO produces code directly from Simulink models, and tested on a TECO 1-hp induction motor supplied by RHYMEBUS RM5 inverter. Both Simulation and experimental results showed that the scheme is effective.