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Добірка наукової літератури з теми "Induction converter"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Induction converter"

Leila, Merabet, Mekki Mounira, Ourici Amel, and Saad Salah. "Modelling and control of wind turbine doubly fed induction generator with MATLAB simulink." Global Journal of Computer Sciences: Theory and Research 7, no. 2 (December 1, 2017): 77–91. http://dx.doi.org/10.18844/gjcs.v7i2.2714.

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Анотація:

This paper describes the modelling and control system of a wind turbine, using a doubly fed induction generator. This configuration makes the wind turbine suitable for variable speed wind energy application. The power captured by the wind turbine is converted into electrical power by the induction generator, and it is transmitted to the grid by the stator and the rotor windings. The control system generates voltage command signals for rotor converter and grid converter, respectively, in order to control the power of the wind turbine. Reactive power exchanged with the network through the converters is set to 0 VAr. The control strategy has been developed using MATLAB/Simulink. The simulation results are presented and discussed in the conclusions. Keywords: Wind energy, doubly fed induction generator, grid power, modelling, control.

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G. Pandian, G. Pandian, and S. Rama Reddy. "Implementation of Boost Converter Fed Induction Motor Drive." International Journal of Scientific Research 2, no. 11 (June 1, 2012): 221–23. http://dx.doi.org/10.15373/22778179/nov2013/71.

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Boros, Ruben Rafael, and István Bodnár. "Grid and PV Fed Uninterruptible Induction Motor Drive Implementation and Measurements." Energies 15, no. 3 (January 19, 2022): 708. http://dx.doi.org/10.3390/en15030708.

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Анотація:

Motors powered directly from solar panels are becoming more and more popular in pump applications. However, solar panels can be the source of operational issues due to varying irradiance, ambient temperature, weather. This paper shows how it is worth expanding a solar induction motor drive to provide an uninterrupted flow of electricity to the motor. In addition, the main components of the uninterruptible induction motor drive are presented, including the LLC (inductor-inductor-capacitor) converter, the three-phase inverter, and the three-phase rectifier. LLC converters that can increase the voltage from 25–40 V to 330 V cannot be bought directly from manufacturers. Therefore, a custom LLC converter was made for the research. It was necessary to build a custom converter to avoid the use of solar panel strings. This way, solar panels connected in parallel can be used. A low-voltage (25–40 V) supply was implemented from the solar side, while the induction motor requires 230 V AC three-phase voltage in delta connection. For this reason, a voltage boost is required from the low voltage side. The grid feeds the universal DC link through the three-phase rectifier. This allows the motor to consume varying amounts of electricity from the grid or the solar panel. The study also presents in detail the LLC converter that performs the voltage boost. Measuring the entire motor drive, switching transients and efficiencies can be observed at different input voltages for different supplies as well as loads.

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García, Nicolás Toro, Yeison Alberto Garcés Gomez, and Vladimir Henao Cespedes. "Robust control technique in power converter with linear induction motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 1 (March 1, 2022): 340. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp340-347.

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Анотація:

Induction motors are widely used in industrial applications as actuators, thanks to their simplicity of construction, which is subsequently reflected in low-cost maintenance. This paper shows the behavior of a three-phase power converter with a linear induction motor (LIM) as load, using a quasi-sliding control technique for output voltage regulation and a new control technique to control chaos. Digital pulse width modulation (DPWM) techniques are widely used to control electronic power converters. The controller proposed in this paper was designed using zero average dynamic (ZAD) and fixed point inducting control (FPIC) techniques. The ZAD-FPIC control strategy was designed and applied to a three-phase converter with linear induction motor load. Since it is not possible to measure the secondary currents, a secondary current observer was included in the system. Finally, bifurcation diagrams are shown as a technique for tuning controller parameters in ZAD-FPIC controllers. For the illustration of numerical results a simulation of the linear induction motor drive controlled was made by MATLAB/Simulink. The designs were tested in a rapid control prototyping (RCP) system based on digital signal processing (DSP) for dSPACE platform, using the 1103 controller card and control desk interface.

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Sanket, B., A. Pandian, and K. V. Siva Reddy. "Performance Analysis of various dc-link Converters for Photovoltaic based Ac Drives." International Journal of Engineering & Technology 7, no. 2.7 (March 18, 2018): 872. http://dx.doi.org/10.14419/ijet.v7i2.7.11085.

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Анотація:

This paper proposes a Performance analysis of DC to DC converters connected to the induction motor drive. The circuit analysis and operating principle of the proposed M-ZS Converter is presented and also characteristics of the different DC-DC are projected. A keen comparison is done between the proposed Modified Z-Source Converter with Boost Converter and Z-Source Converter and MPPT behavior of three converters at different irradiance level and different loading conditions are analyzed. By with the help of MATLAB Simulink, the simulation results are evaluated and presented.

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Memon, Ahsanullah, Mohd Wazir Mustafa, Muhammad Naveed Aman, Abdul Hafeez, and Mukhtar Ullah. "Improving Transient Behavior of a Brushless Doubly Fed Induction Generator through Reactive Current Control of Grid-Side Converter." Electronics 10, no. 12 (June 11, 2021): 1413. http://dx.doi.org/10.3390/electronics10121413.

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Анотація:

Brushless doubly-fed induction generators have higher reliability, making them an attractive choice for not only offshore applications but also for remote locations. These generators are composed of two back-to-back voltage source converters, a grid side converter and a rotor side converter. Existing techniques use the rotor side converter for reactive current control; however, it is more suitable for stabilizing steady state behavior. In order to stabilize the voltage fluctuations at the point of common coupling (PCC) due to sudden inductive load introduction, the grid side converter may be a better choice due to faster response and higher control bandwidth. Therefore, this paper proposes a control scheme for the grid side converter to suppress the PCC voltage fluctuations when a large inductive load is suddenly connected. The proposed technique is based on an analytical model of the transient behavior of the voltage drop at the PCC. The analysis shows that reactive current control using the grid side converter introduces a double fundamental frequency component to the PCC voltage. To block this harmonic, we designed a notch filter. The simulation results in Matlab/Simulink show that the proposed technique can not only significantly reduce the voltage drop but also results in an 82% reduction in voltage distortion at the PCC.

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Aher, VN. "INDUCTION HEATING USING RESONANT CONVERTER." International Journal of Advanced Research 6, no. 12 (November 30, 2018): 514–16. http://dx.doi.org/10.21474/ijar01/8167.

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Nimaje, Kunal. "Review on Standalone Photovoltaic Water Pumping System using Induction Motor Drive." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 4725–27. http://dx.doi.org/10.22214/ijraset.2021.35415.

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Анотація:

The project introduces a simple, low-cost agricultural pumping system. PV, Canonical Switching Cell Converter (CSCC), Boost Inverter and Motor Induction List. The input power of the booster inverter comes from CSV-based photovoltaic (PV). Requires a minimum number of current input elements that do not have the high characteristic power of a CSC converter. DC power conversion from a PV-converted CSV-based system to high voltage AC is achieved using inverter reinforcements. The system verified the maximum power output in the PV system using the P&O MPPT algorithm. Due to the CSC converter and the inverter boosting converter, this system requires a small number of PV series to start the induction motor pump system. The effectiveness of the proposed system will be verified by the MATLAB / SIMULINK environment and the required results will be displayed.

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Periyasamy, Muthu, and Chandrahasan Umayal. "Improved Time Responses of PI & FL Controlled SEPIC Converter based Series Resonant Inverter fed Induction Heating System." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 1 (March 1, 2018): 305. http://dx.doi.org/10.11591/ijpeds.v9.i1.pp305-315.

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Анотація:

This work deals with the Power Factor Corrected Single-Ended Primary Inductor Converter (PFC-SEPIC) based voltage fed closed loop full bridge series resonant induction heating system for household induction heating applications. The output voltage of the front end PFC-SEPIC converter fed series resonant inverter governs the controllers, which may be PI controller or Fuzzy Logic Controller (FLC). The analysis and comparison of time responses are presented in this paper. The PFC-SEPIC converter is used to improve the output power and the THD of source side current are compared for PI and FLC controllers. PFC-SEPIC converter maintains improved current and voltage at unity power factor through the input mains. The SEPIC converter based Voltage Fed Full Bridge Series Resonant Inverter (VFFBSRI) converts the voltage at a frequency of 10 kHz to a level suitable for household induction heating. A 1 kW SEPIC converter based VFFBSRI with RLC load is designed and simulated using MATLAB/ Simulink and hardware is fabricated.

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Nam, Nguyen Huu, G. S. Mytsyk, A. V. Berilov, and Myo Min Thant. "Algorithmic Structure of Wind Turbines System based on an Induction Machine Directly Connected to the Grid." MATEC Web of Conferences 220 (2018): 05004. http://dx.doi.org/10.1051/matecconf/201822005004.

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Анотація:

One of the relatively simple (comparatively cheap) and promising solutions of the wind power plant - the wind turbine system (WTS) with variable speed on the shaft of the wind wheel - is to execute it on the basic of an induction machine - IM. Today, the problem of self-excited induction machine is solved in two ways - by using either capacitors, or electronic converters. As a generating system (based on IM), several WTS are often used, working parallel or directly connected to the grid. For induction machine: squirrel-cage induction generator (SCIG) and doubly-fed induction generator (DFIG) are used, several possible types of them are systematized, evaluated and compared on functional features and properties. Based on computer simulations, the ability of DFIG with back to back converters (in the form of two serially connected 2 level voltage source converters - converter-1 and converter-2) is determined in the rotor circuit at a variable speed of the drive shaft (in modes sub-synchronous and hyper-synchronous speeds) give to the grid only active power. For mass-scale and energy indicators, this structure is the optimum for WTS.

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Більше джерел

Дисертації з теми "Induction converter"

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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Анотація:

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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Mushenya, John. "Energy efficiency analysis of converter-fed induction motors." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29301.

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Анотація:

Electric motor systems are the largest consumers of industrial electrical energy. As Variable Speed Drives continue to dominate various industrial processes, there is need for stakeholders to fully understand and quantify the converter-fed motor losses over a wide range of operating conditions. Such knowledge is crucial for both manufacturers and end-users in performing energy-efficiency optimizations for motor-drive applications. Although there is an increase in legislative activities, particularly in Europe, toward classification and improvement of energy efficiency of electric motor-drive systems, the available standards for quantifying the various losses are still in their early stages of development. None of these standards have yet passed through all the required phases for them to be considered full international standards, owing to a lack of consensus on many technical issues. Therefore, the need for researchers to provide feedback to the relevant standards committees cannot be over-emphasized. One of the most challenging issues in estimating the efficiency of converter-fed motors is the accurate determination of additional harmonic losses due to the PWM voltages and currents. Although the recently introduced IEC 60034-2-3 Technical Specification has proposed a method of determining these losses through experimental testing, the approach is still undergoing validation. Moreover, it only considers the rated motor frequency and voltage whereas induction motor drives are usually operated over a wide range of speed and torque. The main emphasis of the work presented in this dissertation was to develop a thorough understanding of various converter-fed induction motor losses, and hence efficiency, when fed from a 2-level Voltage Source Inverter. In particular, the dissertation provides a healthy questioning of some concepts in the proposed IEC method, with a view to providing useful feedback for improving the standard. Comparisons are also drawn between the related standards to identify areas for improvement. This study further attempts to explain some conflicting reports cited in literature regarding the nature of additional harmonic losses. The experimental results obtained by testing three induction motors demonstrate some of the technical issues associated with the determination of additional harmonic losses. To mitigate the adverse effect of varying technical skill and competence levels on efficiency test results, an automated testing procedure was developed and implemented on the 110kW test rig in the UCT Machines Lab. The test rig, which boasts of a Genesis 7i high-speed Data Acquisition System, also provides an energy-efficient platform for investigating the steadystate and dynamic characteristics of converter-fed motors. By utilizing the capability of the Data Acquisition System to segregate the fundamental and harmonic components of measured input electrical power, it was found that a PWM power supply can be used in place of a conventional Variac to estimate the sinusoidal supply efficiency of an induction motor. This is a welcome development for both laboratory and field efficiency testing applications.

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Druyts, Jan. "Control induction motor by frequency converter : Simulation electric vehicle." Thesis, Halmstad University, Energiteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4968.

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Анотація:

Summary

Today we are probably on a point of change for the car industry. The last century was the century of vehicles with internal combustion engines. Fossil fuels were relative cheap, easy accessible and they have a high specific energy. The pollution and dependency on oil caused the last decade an increasing demand for alternatives. Alternatives for electric power plants and for car drives. Yet the turnover to hybrids is a fact and much research is done for pure electric vehicles. Research about the control of electric motors is by that become a hot topic.

To simulate an electric vehicle drive with an induction motor, a frequency converter is needed. This combination of motor and converter led to many possible experiments. With a few experiments already done and a broad theoretical background report this thesis provides a good bundle of information to start with further experiments. The experiments can become even broader when a flywheel is added as mass inertia momentum and a DC source on the DC-link. Both elements contribute for a better simulation of an electric motor in an electric vehicle.

What is described in this theoretical report about the combination of an induction motor and converter is only the tip of the iceberg. I had too less time to begin experimenting with the flying wheel. The DC-link voltage becomes ca. 540V. From the perspective of safety I could never work alone with the DC-link. Even with a companion it was too dangerous because the equipment of the Halmstad University is not made for such dangerous voltages. That’s why this thesis contains more theoretical background and less actual practical data.

SAMENVATTING

Momenteel bevinden we ons in een tijd van omslag. Na een eeuw waarin de brandstofmotor het transportlandschap domineerde, is er nood aan een alternatief. Fossiele brandstof zorgt voor schadelijke uitlaatgassen bij verbranding en de afhankelijkheid van andere landen voor de bevoorrading van fossiele brandstof blijft altijd een risicofactor. De eerste stap in deze verandering is gezet met de ontwikkeling van hybride wagens. De toekomst zal waarschijnlijk helemaal elektrisch worden. Daarom is het onderzoek naar de controle van elektrische motoren belangrijk.

In de universiteit van Halmstad zijn er verscheidene inductiemotoren aanwezig in het elektriciteitslabo. De doelstelling was dat ik een frequentieomvormer selecteerde, bestelde en parametreerde op basis van deze motoren. Daarnaast kreeg ik de vrijheid om een elektrische wagen te simuleren. Dit zou ik doen door een vliegwiel voor de traagheid en door een batterij na te bootsen om de DC-link te voeden. Al mijn informatie moest ik bundelen in deze thesistekst zodat het eventueel een handige bundel werd voor toekomstige studenten die willen werken met de convertor.

Ik had slechts 2 maanden de tijd om dit uit te voeren, metingen te doen en een theoretisch verslag te schrijven. Vanwege deze korte tijdspanne was het niet mogelijk het vliegwiel te implementeren. Daarnaast was de tussenkringspanning ongeveer 540V DC. Dit is zeer gevaarlijk zodat ze liever hadden dat ik de proeven met een gesimuleerde batterij liet varen. Dit verklaart enigszins waarom uitgebreide meetresultaten ontbreken en deze thesis vooral een bredere theoretische toets heeft.

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Yao, Yanmei. "Study of Induction Machines with Rotating Power Electronic Converter." Doctoral thesis, KTH, Elkraftteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196054.

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Анотація:

This thesis investigates a novel induction machine topology that uses a rotating power electronic converter. Steady-state and dynamic performance of the topology is studied to understand its operational principle. Furthermore the potential of improving its efficiency and power factor is investigated. The topology is referred to as wound rotor induction machine with rotating power electronic converter (WRIM-RPEC). The WRIM-RPEC topology offers the possibility to magnetize the induction machine from the rotor side by introducing a reactive voltage in the rotor. Thus, the power factor of the machine can be improved. Constant speed variable load operation can be achieved by setting the frequency of the introduced voltage. Two options of rotor winding and converter configuration in the WRIM-RPEC system are investigated. The wound rotor windings can either be open-ended and fed by a three-phase back-to-back converter or Y-connected and fed by a single three-phase converter. The dc-link in both converter configurations contains only a floating capacitor. These two configurations give different dc-link voltages at the same torque and speed. Two analytical steady-state models of the topology are developed in this thesis. The first model can be used to analyze the operating condition of the motor at specific speed and torque. Particularly, the operating range of speed and torque of the topology is investigated. The second model is used to analyze variable power factor operation, including unity power factor operation. Analytical calculations and measurements are carried out on a 4-pole, 1.8kW induction machine and the results are compared. A dynamic mathematic model is then developed for the WRIM-RPEC system for the back-to-back converter configuration. The mathematic model is then applied in Matlab/Simulink to study the dynamic performance of the system including starting, loading and phase-shifting. The simulation results are compared with measurements on the 4-pole, 1.8kW induction machine. Moreover, the simulation model using the existing Simulink blocks are studied to compare with the results obtained from the mathematic model. Furthermore, the dynamic performance of the WRIM-RPEC system with the single converter configuration is investigated. In addition, harmonic spectra analysis is conducted for the stator and rotor currents. In the last part of the thesis, efficiency improvement is investigated on the 4-pole induction machine when it is assumed to drive a pump load. It is shown that the efficiency can be further improved by decreasing the rotor resistance. Due to space constraints it is however difficult to decrease the rotor resistance in a 4-pole induction machine. An investigation is thus carried out on a standard 12-pole, 17.5kW squirrel-cage induction machine with inherent low power factor. The cage rotor is redesigned to a wound rotor to enable the connection of converter to the rotor windings. An analytical model is developed to design the wound rotor induction machine. The machine performance from calculations is then compared with FEM simulations with good agreement. The analytical model is further used to design several WRIMs with different dimensions and rotor slot numbers. Power factor and efficiency improvement is then explored for these WRIMs. A promising efficiency increase of 6.8% is shown to be achievable.

QC 20161111

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Chikwanda, Herbert Simbarashe. "The naturally commutated, converter-fed, variable speed induction machine drive." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47805.

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Lei, Ting. "Doubly-fed induction generator wind turbine modelling, control and reliability." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/doublyfed-induction-generator-wind-turbine-modelling-control-and-reliability(2ceb051a-a6fb-43e6-be40-a5023dae4bea).html.

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Анотація:

The trend of future wind farms moving further offshore requires much higher reliability for each wind turbine in order to reduce maintenance cost. The drive-train system and power electronic converter system have been identified as critical sub-assemblies that are subject to higher failure rates than the other sub-assemblies in a wind turbine. Modern condition monitoring techniques may help schedule the maintenance and reduce downtime. However, when it comes to offshore wind turbines, it is more crucial to reduce the failure rates (or reduce the stresses) for the wind turbines during operation since the harsh weather and a frequently inaccessible environment will dramatically reduce their availability once a failure happens. This research examines the mechanical, electrical and thermal stresses in the sub-assemblies of a doubly-fed induction generator (DFIG) wind turbine and how to reduce them by improved control strategies. The DFIG control system (the rotor-side and the grid-side converter control) as well as the wind turbine control system are well established. The interactions of these control systems have been investigated. This research examines several further strategies to reduce the mechanical and electrical stresses. The control system's coordination with the protection schemes (crowbar and dc-chopper) during a grid fault is presented as well. An electro-thermal model of the power converter has been developed to integrate with the DFIG wind turbine model, for the evaluation of the thermal stresses under different operating states and control schemes. The main contributions of this thesis are twofold. A first contribution is made by providing all the control loops with well-tuned controllers in a more integrated methodology. The dynamics of these controllers are determined from their mathematical models to minimize the interference between different control-loops and also to reduce the electrical transients. This thesis proposes a coordination strategy for the damping control, pitch control and crowbar protection which significantly reduces the mechanical oscillations. On the other hand, an integrated model of the wind turbine and converter electro-thermal system is established that can illustrate the performance integration with different control strategies.

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Wyllie, Peter Bruce. "Electrothermal modelling for doubly fed induction generator converter reliability in wind power." Thesis, Durham University, 2014. http://etheses.dur.ac.uk/10902/.

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Анотація:

Increased reliance upon renewable energy sources, chiefly wind, places a growing emphasis on the reliability of the technology used in Wind Turbines. The current Wind Turbine fleet is dominated by the Doubly Fed Induction Machine WT, which utilises a partially rated power electronic converter to vary the speed of the rotor and thus ensure the maximum energy capture available from the wind. This converter is associated with a significant percentage of WT failures. This thesis examines the low frequency temperature cycling occurring in one half of the back to back converter which results in a high failure rate of the rotor side converter as compared to the grid side converter. To this end a MATLAB/PLECS model was constructed to demonstrate the temperature cycling occurring in a 2.5MW DFIG WT. Lifetime of the semiconductor devices was extrapolated. An adaptation to the standard Maximum Power Point Tracking control method was suggested in which the lowest operating frequencies (less than 2.33Hz) were avoided. In doing so, lifetime was observed to increase at a minor cost to energy yield from the WT.

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Chileshe, C. M. "A converter compensator for power factor control in 3-phase induction machines." Thesis, Aston University, 1996. http://publications.aston.ac.uk/12244/.

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Анотація:

The advent of the harmonic neutralised shunt Converter Compensator as a practical means of reactive power compensation in power transmission systems has cleared ground for wider application of this type of equipment. An experimental 24-pulse voltage sourced convector has been successfully applied in controlling the terminal power factor of a 1.5kW, 240V three phase cage rotor induction motor, whose winding has been used in place of the usual phase shifting transformers. To achieve this, modifications have been made to the conventional stator winding of the induction machine. These include an unconventional phase spread and facilitation of compensator connections to selected tapping points between stator coils to give a three phase winding with a twelve phase connection to the twenty four pulse converter. Theoretical and experimental assessments of the impact of these modifications and attachment of the compensator have shown that there is a slight reduction in the torque developed at a given slip and in the combined system efficiency. There is also an increase in the noise level, also a consequence of the harmonics. The stator leakage inductance gave inadequate coupling reactance between the converter and the effective voltage source, necessitating the use of external inductors in each of the twelve phases. The terminal power factor is fully controllable when the induction machine is used either as a motor or as a generator.

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Fjällström, Emil. "Impact of Converter Modulation Strategies on the Losses in a Traction Motor." Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-163530.

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Анотація:

With an increased demand on high-efficiency electrical machines in traction applications, better understanding in the losses induced by the converter is needed. The harmonic losses from the converter are non-negligible part of the total losses in an induction machine, and these harmonic losses have been studied here with a focus on iron, skin-effect and proximity losses. The main goal of the thesis is to advise how the modulation method can be changed to lower these time harmonic losses in an induction machine. A model of the induction machine was created in the FEM(Finite Element Method) software FLUX. The iron, the proximity and the skin-effect losses were simulated in the FLUX model with different modulation method to analyse the time harmonic losses due to respective phenomena. The modulation method at higher operation is square-wave modulation, this is due to that maximum fundamental voltage has been reached. At lower operation, pulse width modulation is used, and the switching frequency can be increased to lower the time harmonics losses in the motor. The iron losses simulated in FLUX show that the losses increase with frequency even if the motor enters flux weakening operation at higher frequencies. The proximity phenomena gives rise to a distinct increase of resistive losses in the conductor closest to the air gap in the stator winding. The skin-effect phenomena affects the losses at square-wave modulation of high frequencies mostly as the time harmonics are larger and of low order.
Med en ökad efterfrågan på högeffektiva elektriska maskiner i traktionsapplikationer, måste man ha en högre förståelse i de förluster som induceras av frekvensomvandlaren. Förlusterna från frekvensomvandlaren är en icke försumbar del av de totala förlusterna i induktionsmaskinen. Förlusterna har här analyserats med fokus på järn-, skineffekt- och proximityförluster. Huvudsyftet med examensarbetet är att ge råd i hur moduleringsmetoden kan ändras för att sänka övertonsförlusterna i en induktionsmaskin. En modell av induktionsmaskinen skapades i FEM(Finita Elementmetoden) mjukvaran FLUX. Järn-, proximity- och skineffektförlusterna simulerades i FLUX-modellen med olika moduleringsmetoder för att analysera övertonsförluster på grund av respektive fenomen. Moduleringsmetoden vid högre drift är fyrkantmodulering, det är på grund av att maximal fundamental spänning har uppnåtts. Vid lägre drift har pulsbreddsmodulering använts och switchfrekvensen kan ökas för att sänka övertonersförlusterna i motorn. Järnförlusterna som simulerades i FLUX-modellen visar att förlusterna ökar med frekvensen även när motorn utsatts för fältförsvagning vid högre frekvensker. Proximityfenomenet ger upphov till en tydlig ökning av resistiva förluster i ledaren närmast luftgapet i statorlindningen. Skineffektfenomenet påverkar förlusterna på fyrkantsmoduleringen av höga frekvenser, mest på grund av att övertonerna är större och av låg ordning.

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Cheng, Siwei. "Utilizing the connected power electronic converter for improved condition monitoring of induction motors and claw-pole generators." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43638.

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This dissertation proposes several simple, robust, and non-intrusive condition monitoring methods for induction motors fed by closed-loop inverters and claw-pole generators with built-in rectifiers. While the flexible energy forms synthesized by power electronic converters greatly enhance the performance and expand the operating region of induction motors and claw-pole generators, they also significantly alter the fault behavior of these electric machines and complicate the fault detection and protection. In this dissertation, special characteristics of the connected closed-loop inverter and rectifier have been thoroughly analyzed, with particular interest in their impact on fault behaviors of the induction motor and the claw-pole generator. Based on the findings obtained from the theoretical and experimental analysis, several sensorless thermal, mechanical, and insulation monitoring methods are proposed by smartly utilizing special features and capabilities of the connected power electronic converter. A simple and sensitive stator turn-fault detector is proposed for induction motors fed by closed-loop inverter. In addition, a stator thermal monitoring method based on active DC current injection and direct voltage estimation is also proposed to prevent the closed-loop controlled induction motors from thermally overloading. The performance of both methods is demonstrated by extensive experimental results. Methods to detect serpentine belt slip, serpentine belt defect, rotor eccentricity have been proposed for claw-pole generators using only the available electric sensor information. Methods to detect and protect stator turn faults in claw-pole generators are also presented in this dissertation. Lastly, a novel method to detect the generalized bearing roughness fault is proposed. All the proposed condition monitoring techniques have been validated by experimental results.

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Книги з теми "Induction converter"

Abu Mohareb, Omar. Efficiency Enhanced DC-DC Converter Using Dynamic Inductor Control. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-25147-5.

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Yang, Bai. Study of single-phase pulse converters for feeding induction machine drives in railway traction application. Birmingham: University of Birmingham, 1992.

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Wens, Mike, and Michiel Steyaert. Design and Implementation of Fully-Integrated Inductive DC-DC Converters in Standard CMOS. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1436-6.

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Barlik, Roman. Teoria i projektowanie tyrystorowych falowników prądu zasilających maszyny indukcyjne. Warszawa: Wydawnictwa Politechniki Warszawskiej, 1988.

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McGrow, Lindsay. The novel use of inductor alternators and electronic converters for low cost DC generation. [s.l.]: typescript, 1999.

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Maznev, Aleksandr, and Oleg Shatnev. Electric apparatus and circuits of rolling stock. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1014641.

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Provides information about technical data and design of electrical apparatus of control, monitoring and protection of traction motors of electric rolling stock (EPS), the principles of speed control of locomotives and trains with contactor-resistor and semiconductor converters based on modern element base, a circuit diagram of various types of EPS with manifold and induction motors in modes of traction and braking. For students of institutions of secondary professional education. It may be useful to students of higher educational institutions, courses of improvement of qualification, the railway workers related to the maintenance and repair of rolling stock.

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Converter controlled induction motor drives. Budapest: OMIKK Publisher, 1990.

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Mind Converter (Mind-Electronics for Easy Trance Induction). Dick Sutphen, 2002.

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Singh, G. K., and M. Bhattacharya. CAD of Optimum Converter Motor Pair for Induction Drives. Laxmi Publications, 2005.

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Weintraub, Ruth. Scepticism about Inference to the Best Explanation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198746904.003.0012.

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Scepticism about inference to the best explanation is far less often discussed than scepticism about another ampliative form of inference, enumerative induction. Both of these inference forms are widely used, and scepticism about either can pose an important challenge. This chapter aims to redress the imbalance by giving scepticism about inference to the best explanation the attention it, too, deserves. The chapter’s conclusion is that inference to the best explanation, even to the observable, may be in a worse epistemic position than enumerative induction. The reason for this is that there are sceptical arguments that target inference to the best explanation which do not have inductive analogues, but the converse is not true.

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Частини книг з теми "Induction converter"

Lipo, Thomas A. "Converter Topologies for Induction Motor Drives." In Modern Electrical Drives, 273–88. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9387-8_12.

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Shah, Happy L., Khushali A. Joshi, Nirali A. Solanki, Shreya A. Vyas, and Nilesh K. Jaiswal. "Induction Heating Using Three-Phase Variable Frequency Converter." In Information and Communication Technology for Competitive Strategies (ICTCS 2020), 313–24. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0739-4_31.

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Lavanya, S., and T. Annamalai. "Implementation of Isolated Two Inductor Boost Converter for Induction Motor Drive Applications." In Advances in Intelligent Systems and Computing, 643–54. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2135-7_68.

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Dems, Maria, Krzysztof Koméza, and Sławomir Wiak. "Computer Modelling of Energy-Saving Small Size Induction Electromechanical Converter." In Studies in Computational Intelligence, 269–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78490-6_32.

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Song, Haihui, and Tian De. "Study on Rotor-Side Converter of Doubly Fed Induction Generator." In Lecture Notes in Electrical Engineering, 473–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27311-7_63.

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Tamvada, Karthik, and S. Umashankar. "Fuzzy Rotor Side Converter Control of Doubly Fed Induction Generator." In Advances in Intelligent Systems and Computing, 657–63. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7868-2_62.

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Meena Devi, R., V. Geetha, and V. Meenakshi. "Speed Control of SEPIC Converter-Based Induction Motor Drive System." In Springer Proceedings in Energy, 15–23. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0719-6_2.

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Elangovan, P., S. Ganesh, and L. Hubert Tony Raj. "Efficacy of Super-Lift Converter Over Fundamental Converters in Induction Motor Drive Using Solar Energy." In Energy Systems in Electrical Engineering, 155–72. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4388-0_8.

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Vivek Sharma, Ashutosh Bhatt, Nikita Rawat, and Shobhit Garg. "Performance Analysis of Interleaved Coupled Inductor Boost DC–DC Converter Fed Induction Motor Drive." In Proceeding of International Conference on Intelligent Communication, Control and Devices, 259–65. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1708-7_30.

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Peñaranda, Edison Andrés Caicedo, Jorge Luis Díaz Rodríguez, and Luis David Pabón Fernández. "Sensorless Control of an Induction Motor with Common Source Multilevel Converter." In Advances in Automation and Robotics Research, 157–71. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40309-6_16.

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Тези доповідей конференцій з теми "Induction converter"

Watanabe, E. "High performance motor drive using matrix converter." In IEE Seminar on Advances in Induction Motor Control. IEE, 2000. http://dx.doi.org/10.1049/ic:20000387.

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Schofield, J. R. G. "A 3.3 kV variable frequency converter for retrofitting to existing motors." In IEE Seminar on Advances in Induction Motor Control. IEE, 2000. http://dx.doi.org/10.1049/ic:20000382.

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Lettl, Jiri. "Matrix Converter Induction Motor Drive." In 2006 12th International Power Electronics and Motion Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/epepemc.2006.4778495.

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Lettl, Jiri. "Matrix Converter Induction Motor Drive." In 2006 12th International Power Electronics and Motion Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/epepemc.2006.283256.

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R. F. B. de Souza, Victor, Luciano S. Barros, and Flavio B. Costa. "Performance Comparison of Converter Topologies for Double Fed Induction Generator-based Wind Energy Conversion Systems." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1512.

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The advancements in power electronics have supported the widespread penetration of wind energy conversion systems (WECS) in electric grids. In this context, power converters have crucial functionality in the control of active and reactive power injection, moreover they are directly related to voltage and current harmonic distortion levels, mechanical and thermal stress that are experienced by the wind turbine. Currently, several topologies have been tested in order to improve the performance and increase the power processing of WECS to support the network demand. Based on the relevance of this issue, this paper presents a performance comparison of a Double Fed Induction Generator(DFIG)-based WECS employing three topologies of back-toback converters: two-level voltage source converter topology (2L-VSC), neutral point clamped (NPC) and modular multilevel converter (MMC). Simulation results present DFIG currents, voltages, torque, speed and the total harmonic distortion (THD), highlighting the performance improvement employing multilevel topologies and the impacts of using each topology.

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Aarniovuori, Lassi, Antti Kosonen, Markku Niemela, and Juha Pyrhonen. "Frequency converter driven induction motor losses." In IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2013. http://dx.doi.org/10.1109/iecon.2013.6699588.

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Rasmussen, C. B. "Hybrid resonant converter for induction heating." In Proceedings of 5th International Conference on Power Electronics and Variable-Speed Drives. IEE, 1994. http://dx.doi.org/10.1049/cp:19940999.

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Uthman, Yasir, Grace Oletu, and Olumide Longe. "Practical DC Induction Cooker Design and Implementation." In 27th iSTEAMS-ACity-IEEE International Conference. Society for Multidisciplinary and Advanced Research Techniques - Creative Research Publishers, 2021. http://dx.doi.org/10.22624/aims/isteams-2021/v27p19.

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Induction heating is a well-known Technology that is usually used for cooking appliances because of its highenergy efficiency. This paper presents a practical design of a low voltage induction cooker, with a centretapped, and parallel resonant converter. The process is fully analyzed and the practical implementation has been put in place to create a 500W – 1KW low voltage induction cooker. This was done through a series of experiments on the effect of eddy current and electromagnetic induction. The results and performance are shown for a prototype induction cooking system. It provides a substantial solution to the cooking problem in most developing countries. Keywords - Resonant converter, induction cooking, coil, phase angle, frequency tracking

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Lurick, R., S. Bernet, and M. Michel. "A new IGCT converter topology for high power induction heating converters." In 2008 IEEE Applied Power Electronics Conference and Exposition - APEC 2008. IEEE, 2008. http://dx.doi.org/10.1109/apec.2008.4522983.

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Isembergenov, N. Т., A. Zh Sagyndikova, and А. A. Sarsenova. "INDUCTION METJD OF HEATION OIL IN LOW- DEBIT WELLS." In INNOVATIVE TECHNOLOGIES IN SCIENCE AND EDUCATION. DSTU-Print, 2020. http://dx.doi.org/10.23947/itno.2020.403-407.

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The article discusses the induction method of heating oil in low-yield wells. For this, it is proposed to use an induction heater and a frequency converter. It is shown that at current frequencies of 1 - 1.5 kHz, an induction heater and an inverter frequency converter can be installed at the bottom of oil wells. The inverter will be made on JGBT transistor modules that can switch voltages up to a thousand volts, currents of hundreds of amperes and tens of kilowatts of power.

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Звіти організацій з теми "Induction converter"

Sadka, Avi, Mikeal L. Roose, and Yair Erner. Molecular Genetic Analysis of Citric Acid Accumulation in Citrus Fruit. United States Department of Agriculture, March 2001. http://dx.doi.org/10.32747/2001.7573071.bard.

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The acid content of the juice sac cells is a major determinant of maturity and fruit quality in citrus. Many citrus varieties accumulate acid in concentrations that exceed market desires, reducing grower income and consumer satisfaction. Pulp acidity is thought to be dependent on two mechanisms: the accumulation of citric acid in the vacuoles of the juice sac cells, and acidification of the vacuole. The major aim of the project was to direct effort toward understanding the mechanism of citric acid accumulation in the fruit. The following objectives were suggested: Measure the activity of enzymes likely to be involved in acid accumulation and follow their pattern of expression in developing fruit (Sadka, Erner). Identify and clone genes which are associated with high and low acid phenotypes and with elevated acid level (Roose, Sadka, Erner). Convert RAPD markers that map near a gene that causes low acid phenotype to specific co dominant markers (Roose). Use genetic co segregation to test whether specific gene products are responsible for low acid phenotype (Roose and Sadka). Objective 1 was fully achieved. Most of the enzymes of organic acid metabolism were cloned from lemon pulp. Their expression was studied during fruit development in low and high acid varieties. The activity and expression of citrate synthase, aconitase and NADP-isocitrate dehydrogenase (IDH) were studied in detail. The role that each enzyme plays in acid accumulation and decline was evaluated. As a result, a better understanding of the metabolic changes that contribute to acid accumulation was achieved. It was found that the activity of the mitochondrial aconitase is greatly reduced early in high-acid fruits, but not in acidless ones, suggesting that this enzyme plays an important role in acid accumulation. In addition, it was demonstrated that increases in the cytosolic forms of aconitase and NADP-IDH towards fruit maturation play probably a major role in acid decline. Our studies also demonstrated that the two mechanisms that contribute to fruit acidity, vacuolar acidification and citric acid accumulation, are independent, although they are tightly co-regulated. Additional, we demonstrated that sodium arsenite, which reduce fruit acidity, causes a transient inhibition in the activity of citrate synthase, but an induction in the gene expression. This part of the work has resulted in 4 papers. Objective 3 was also fully achieved. Using bulked segregant analysis, three random amplified polymorphic DNA (RAPD) markers were identified as linked to acitric, a gene controlling the acidless phenotype of pummelo 2240. One of them, which mapped 1.2 cM from acitric was converted into sequence characterized amplified region (SCAR marker, and into co dominant restriction length polymorphism (RFLP) marker. These markers were highly polymorphic among 59 citrus accessions, and therefore, they should be useful for selecting seedling progeny heterozygous for acitric in nearly all crosses between pummelo 2240 and other citrus genotypes. This part of the project resulted in one paper. Objective 4 was also fully achieved. Clones isolated by the Israeli group were sent to the American laboratory for co segregation analysis. However, none of them seemed to co segregate with the low acid phenotype. Both laboratories invested much effort in achieving the goals of Objective 2, namely the isolation of genes that are elevated in expression in low and high acid phenotypes, and in tissue cultures treated with arsenite (a treatment which reduces fruit acidity). However, conventional differential display and restriction fragment differential display analyses could not identify any differentially expressed genes. The isolation of such genes was the major aim of a continuation project, which was recently submitted.

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Samach, Alon, Douglas Cook, and Jaime Kigel. Molecular mechanisms of plant reproductive adaptation to aridity gradients. United States Department of Agriculture, January 2008. http://dx.doi.org/10.32747/2008.7696513.bard.

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Annual plants have developed a range of different mechanisms to avoid flowering (exposure of reproductive organs to the environment) under adverse environmental conditions. Seasonal environmental events such as gradual changes in day length and temperature affect the timing of transition to flowering in many annual and perennial plants. Research in Arabidopsis and additional species suggest that some environmental signals converge on transcriptional regulation of common floral integrators such as FLOWERING LOCUS T (FT). Here we studied environmental induction of flowering in the model legume Medicago truncatula. Similarly to Arabidopsis, the transition to flowering in M. truncatula is hastened by long photoperiods and long periods of vernalization (4°C for 2-3 weeks). Ecotypes collected in Israel retain a vernalization response even though winter temperatures are way above 4°C. Here we show that this species is also highly responsive (flowers earlier) to mild ambient temperatures up to 19°C simulating winter conditions in its natural habitat. Physiological experiments allowed us to time the transition to flowering due to low temperatures, and to compare it to vernalization. We have made use of natural variation, and induced mutants to identify key genes involved in this process, and we provide here data suggesting that an FT gene in M.truncatula is transcriptionally regulated by different environmental cues. Flowering time was found to be correlated with MtFTA and MtFTB expression levels. Mutation in the MtFTA gene showed a late flowering phenotype, while over-expressing MtFTA in Arabidopsis complemented the ft- phenotype. We found that combination of 4°C and 12°C resulted in a synergistic increase in MtFTB expression, while combining 4°C and long photoperiods caused a synergistic increase in MtFTA expression. These results suggest that the two vernalization temperatures work through distinct mechanisms. The early flowering kalil mutant expressed higher levels of MtFTA and not MtFTB suggesting that the KALIL protein represses MtFTA specifically. The desert ecotype Sde Boker flowers earlier in response to short treatments of 8-12oc vernalization and expresses higher levels of MtFTA. This suggests a possible mechanism this desert ecotype developed to flower as fast as possible and finish its growth cycle before the dry period. MtFTA and FT expression are induced by common environmental cues in each species, and expression is repressed under short days. Replacing FT with the MtFTA gene (including regulatory elements) caused high MtFTA expression and early flowering under short days suggesting that the mechanism used to repress flowering under short days has diversified between the two species.The circadian regulated gene, GIGANTEA (GI) encodes a unique protein in Arabidopsis that is involved in flowering mechanism. In this research we characterized how the expression of the M.truncatula GI ortholog is regulated by light and temperature in comparison to its regulation in Arabidopsis. In Arabidopsis GI was found to be involved in temperature compensation to the clock. In addition, GI was found to be involved in mediating the effect of temperature on flowering time. We tested the influence of cold temperature on the MtGI gene in M.truncatula and found correlation between MtGI levels and extended periods of 12°C treatment. MtGI elevation that was found mostly after plants were removed from the cold influence preceded the induction of MtFT expression. This data suggests that MtGI might be involved in 12°C cold perception with respect to flowering in M.truncatula. GI seems to integrate diverse environmental inputs and translates them to the proper physiological and developmental outputs, acting through several different pathways. These research enabled to correlate between temperature and circadian clock in M.truncatula and achieved a better understanding of the flowering mechanism of this species.

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