balanced three phase motors and impedance loads

Design and Implementation of a Three-Phase Induction Motor Control Scheme

Ngày tải lên : 27/10/2013, 23:15

... objective of PWM is to shape and control the three- phase output voltages in magnitude and frequency by utilization of a constant DC voltage PWM is a process where three- phase sinusoidal signals are ... parts: the stator (the stationary part) and the rotor (the moving part) For a three- phase induction machine (this will be used in this thesis project), three- phase sinusoidal voltages are applied ... with two -phase currents to generate a means of instantaneously controlling the torque and flux Field-orientated controllers require control of both magnitude and phase of the AC quantities and are,...

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Tài liệu ime Control of a Three Phase 4 Wire PWM Inverter with Variable DC Link Voltage and Battery Storage for PV Application doc

Ngày tải lên : 19/01/2014, 02:20

... r ssed in [4], [6 and [8] an 6] nd for three pha inverters in [1], [2], [3], [5] and [7], the dead beat contro in [1] and [2] is adopte ase s d ol ed and extended to mach fo three phas wire VS ... in figure To control i rd n o and sepa arately the co oupling elem ments b and d are decoupled b the matrix Fdc and AIdc so that d by xes and de epend only on a and c After removin A ng the coupling ... Miyashita and Yushin Yamamoto, "Dead Beat Control of threePhase PWM Inverter", IEEE Transactions on Power Electronics, Vol 5, No 1, January 1990, pp 21-28 [3] Osman Kükrer, "Deadbeat Control of a Three- Phase...

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Conventional Three-Phase Fixed-Bed Technologies: Analysis and Critique docx

Ngày tải lên : 16/03/2014, 22:20

... represents TBRs and BCRs with gas recirculation The liquid and gas to be processed are fed by pump and compressor 6, respectively, and mixed with the gas recycled by compressor The two -phase gas–liquid ... exempt from the relevant protective laws and regulations and therefore free for general use While the advice and information in this book are believed to be true and accurate at the date of publication, ... of new multiphase processes and discovery of unknown catalytic phenomena, the author could not understand why some professionals engaged in academic research, industrial development and operation...

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Analysis, design and implementation of high performance control schemes for three phase PWM AC DC voltage source converter

Ngày tải lên : 11/09/2015, 16:02

... voltages in three phase a-b-c frame ea1 , eb1 , ec1 three phase fundamental frequency supply voltages ep ,ep ,ep a b c three phase positive sequence supply voltages en ,en ,en a b c three phase negative ... calculator da , db , dc duty cycles for three phase dao , dbo , dco switching functions for three phase bottom switches dap , dbp , dcp switching functions for three phase top switches D(z) disturbance ... 26 2.1 The three- phase PWM AC-DC voltage source converter circuit 39 2.2 Phasor diagram of the unbalanced three- phase variables 40 xvii List of Figures 2.3 Equivalent circuit and phasor...

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An experimental study of pressure drop characteristics in vertical upward two phase and three phase flows

Ngày tải lên : 28/09/2015, 13:28

... flow of liquid and gas in vertical conduits, models capturing viscosity of suspensions and emulsions, phase inversion phenomenon and pressure drop prediction in two and three phase systems The ... (liquid-liquid) and three phase (liquid-liquid-gas) pressure drop measurement in vertical pipe The two phase pressure drop experiment was conducted focusing on the phase inversion phenomenon The three phase ... phase xiii – wall shear stress – wall shear rate Q – volume flow rate ̇ – multiphase mixture quality Subscript o – oil phase w – aqueous phase m – oil-water mixture L – liquid phase G – gas phase...

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Hydrodynamics studies in two and three phase bubble column

Ngày tải lên : 22/10/2015, 21:14

... partial aeration and uniform aeration using PIV technique 1.2 Organization of thesis This thesis is organized to address the study of hydrodynamics in two- and threephase bubble column and column containing ... 2.4.1.1) in two and three phase bubble column can be found in limited literature because there are some limitation to use with this technique, the gas holdup should be

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Effect of periodic suction on three dimensional flow and heat transfer past a vertical porous plate embedded in a porous medium

Ngày tải lên : 05/09/2013, 14:58

... describe the three- dimensional flow through a porous medium For solution, we shall first consider three equations (30), (32) and (33) being independent of the main flow component u1 and the temperature ... the velocity and temperature of the flow field are solved employing perturbation technique and the effects of the flow parameters on the velocity and temperature of the flow field and also on ... perturbation technique and the effects of the pertinent parameters on the velocity, temperature, skin friction and the rate of heat transfer are discussed with the help of figures and tables Mathematical...

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Vector control of three phase AC machines - N.P.Quang

Ngày tải lên : 18/12/2013, 09:10

... 3 -phase AC motor with three phase windings u, v and w The three phase voltages are applied by three pairs of semiconductor switches vu+/vu-, vv+/vv- and vw+/vw- with amplitude, frequency and phase ... Power Systems Nguyen Phung Quang and Jörg-Andreas Dittrich Vector Control of Three- Phase AC Machines Nguyen Phung Quang · Jörg-Andreas Dittrich Vector Control of Three- Phase AC Machines System Development ... between the axes d and q Fig 1.6 Modern structures with field-orientated control for three- phase AC drives using IM and VSI with current control loop in field coordinates (top) and in stator-fixed...

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Matlab simulink model three phase voltage source inverter

Ngày tải lên : 24/12/2013, 11:32

... vector is a simultaneous representation of all the three- phase quantities It is a complex variable and is function of time in contrast to the phasors Phase- to-neutral voltages of a star-connected ... 1,3,5 0 2,4,6 Table Phase voltage space vectors State Phase voltage space vectors 12/ 3) Vdc / (101) Figure Phase voltage space vectors -(2/3) VdC '(100) Real (001) Table Phase voltage values ... the developed model for maximum obtainable reference voltage and the resulting filtered leg and phase voltages are shown in Figs and CONCLUSIONS This section details the step by step development...

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A fuzzy logic CC PWM three phase AC DC converter

Ngày tải lên : 03/01/2014, 19:44

... Current Regulator for Three- phase Power Converters”, IEEE Trans on Power Electronics, vol 13, NO 3, May 1998 pp419-426 M.-T Tsai, W I Tsai: “Analysis and design of Three- phase AC-to-DC Converters ... , ( t ) dt (1 1) where P, is the converter output power: where R and L are the values of the phase resistance and inductance and e(t) = [e,(t) eb(t) e c ( t ) r is the supply voltages vector ... [2]: IL" 3E2 =4RVo Unfortunately, the three- phase converter must be able to impose the energy exchange and to fulfil the constraints on the input currents and output voltage even in transient...

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A three phase voltage type PWM rectifier with the function of an active power filter

Ngày tải lên : 03/01/2014, 19:44

... active filtering operation, the P W M rectifier is 387 i,, PWM signals SI,, S, and S , for phase U, phase v and phase w , respectively, are generated as follows: are obtained, which are given ... , S, and S , , the six s of the PWM rectifier areswitched switches s, on and off in the following manner to generate the PWh4 waveforms of the rectifier AC-side phase , voltages vjl, vi,, and ... signal forphase v which is given by (11) can also be obtained in the same manner as that explained above for phase U EXPERIMENTAL INVESTIGATION To confirm the operation of the three- phase PWM...

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Current control techniques for three phase voltage source PWM converters a survey

Ngày tải lên : 03/01/2014, 19:45

... KAZMIERKOWSKI AND MALESANI: CC TECHNIQUES FOR THREE- PHASE VS-PWM CONVERTERS While phase voltages can be controlled independently, phase currents are determined not only by their own phase voltage, ... rotating and stationary frames,” in Proc IEEE IECON’93, 1993, pp 1193–1198 [37] A Ackva, H Reinold, and R Olesinski, “A simple and self-adapting high-performance current control scheme for three- phase ... Sabanovic, and B Perunicic, “Control of three- phase switching converters, a sliding mode approach,” in Conf Rec IEEE PESC’93, 1993, pp 630–635 [65] S Salama and S Lennon, “Overshoot and limit...

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Electric motors and drives technical manual 2010 edition

Ngày tải lên : 12/01/2014, 10:43

... Association (NEMA) sets motor standards, including what should go on the nameplate (NEMA Standard MG 1-10.40 "Nameplate Marking for Medium Single -Phase and Polyphase Induction Motors" ) In most of the ... (IEC) sets the standards Or at least many countries base their standards very closely on the IEC standards (for example, Germany's VDE 0530 standard and Great Britain's BS 2613 Standard closely ... pumps and other direct coupled loads where there will not be a side pull (overhung load) exerted on the shaft by “V” belts Table 1.2B – NEMA Frame Assignment – Three- Phase Motors OPEN MOTORS...

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02 three dimensional static and dynamic analysis of structure

Ngày tải lên : 12/01/2014, 21:45

... and are defined in terms of three numbers: modulus of elasticity E , Poisson’s ratio 1-2 STATIC AND DYNAMIC ANALYSIS ν and coefficient of thermal expansion α In addition, the unit weight w and ... program unless you fully understand the theory and approximations used within the program” and “do not create a computer model until the loading, material properties and boundary conditions are clearly ... edition of Three Dimensional Dynamic Analysis of Structures is included and updated in this book I am looking forward to additional comments and questions from the readers in order to expand the...

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Tài liệu Manual for induction motors and generators ppt

Ngày tải lên : 26/01/2014, 09:20

... lifting and turning 3BFP 000 050 R0101 REV C Transport and Unpacking - 11 Manual for Induction Motors and Generators 2.4 Checks upon arrival and unpacking 2.4.1 Check upon arrival The machine and ... Induction Motors and Generators Chapter Installation and Alignment 3.1 General Good planning and preparation result in simple and correct installation and assure safe running conditions and maximum ... Establish and maintain safe equipotential bonding The clearances between uninsulated live parts and between such parts and earth must not be below the values of appropriate standards and values...

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asg 3 motors and oads

Ngày tải lên : 15/02/2014, 08:37

... 3 Motors and loads Summary 3.1 Three phase asynchronous motors 38 3.2 Single -phase motors 42 3.3 Synchronous motors 43 3.4 Direct current motors commonly named DC motors 45 3.5 Operating ... capacitors values and derating A Fig 10 42 Single phase short circuit phase- shift rings Motors and loads 3.2 3.3 Single -phase motors Synchronous motors b Universal single -phase motors Though little ... resistors and radically improve the installation’s efficiency 41 3 Motors and loads 3.2 3.2 Single -phase motors Single -phase motors The single -phase motor, though less used in industry than the 3 -phase, ...

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Chapter 12 fully controlled three phase bridge converters

Ngày tải lên : 16/02/2014, 18:53

... that v0s is zero for a balanced three- phase induction motor Show that v0s is zero for a balanced three- phase synchronous machine Show that v0s is zero for a balanced three- phase permanent magnet ... CONTROLLED THREE- PHASE BRIDGE CONVERTERS Figure 12.8-1 State transition diagram Figure 12.8-2 Allowable current band * ias = 19.1cos(θ c − 17.4°) and the b- and c -phase reference currents lag the a -phase ... modulated three- phase bridge The dc voltage is 100 V, and the desired q- and d-axis voltages r r are vqs = 50 V and vds = 10 V Specify the duty-cycle d and the relationship between θc and θr such...

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Liquid-Gas Relative Permeabilities in Fractures: Effectsof Flow Structures, Phase Transformation and Surface Roughness pot

Ngày tải lên : 23/03/2014, 15:20

... permeabilities; and (2) phase transformation along the interface of a stagnant phase and the other phase flowing around it controls the irreducible phase saturation of the stagnant phase [Verma, ... rough-walled (HR) and randomly rough-walled (RR) fractures These three specially designed fractures represent three distinct surface geometries and heterogeneities Two -phase flow structures and relative ... We compared the flow behavior and relative permeability differences between two -phase flow with and without phase transformation effects and between smooth-walled and rough-walled fractures We...

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