4 three phase contrast enhanced dual energy acquisition with second generation dual source ct

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

... 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 Inverter with an Output LC ... Takeshi Miyashita and Yushin Yamamoto, "Digital Control of three -Phase Inverter with LC Filter", IEEE Transactions on Power Electronics, Vol 6, No 1, January 1991, pp 62-72 [2] Takao Kawabata, ... system w phase wire PWM voltage so aic with M ource inverte er Since the po ower generat by an arr of PV pa ted ray anels is direc ct- current, it may be transformed, eith her into a power with consta...

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BỘ CHỈNH LƯU KÉP 3 PHA THREE - PHASE DUAL CONTROLLED RECTIFIER

Ngày tải lên : 18/03/2016, 05:21

... current direction conversion of electromagnet of electric bridge crane For former method, the direction conversion is usually used by contactor or relay The use of contactor for directly switching ... release electric arc and have low switching frequency The application of dual rectifiers will help to overcome the disadvantage as mentioned above In addition, the dual controlled rectifier with common ... thyristor's dual synchronous controller, control circuit, load circuit and experimental results of three -phase dual controlled rectifier Keyword: Synchronous control, firing pulse, dual rectifier...

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

Ngày tải lên : 27/10/2013, 23:15

... speed of the magnetic field with respect to the speed of the rotor 4.2 The Electrical principles of an Induction motor The induction machine is an electrical device The electrical properties that ... induction motor: 2001 Thesis Project A5 Gareth S Roberts ♦ Static frequency charges ♦ Static voltage controllers ♦ Rectifier-inverter systems with line commutation ♦ Rectifier-inverter systems with ... and Practice Wildi [1] is an excellent source of information on the theory behind the operation of an induction motor The three -phase induction machine is presented in Chapter 13 The electromagnetic...

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

Ngày tải lên : 18/12/2013, 09:10

... control structure with direct decoupling for PMSM References C Wind Power Plants with DFIM 10 Linear control structure for wind power plants with DFIM Construction of wind power plants with DFIM ... based on “exact linearization” Feedback control structure with direct decoupling for IM Nonlinear control structure for drive systems with PMSM Nonlinear controller design based on “exact linearization” ... Sensitivity function Imaginary, real part of the sensitivity function Vector of grid voltage General analytical vector function Pulse, rotor, stator frequency Transfer function Iron loss conductance...

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Matlab simulink model three phase voltage source inverter

Ngày tải lên : 24/12/2013, 11:32

... nearest active vectors and zero vector To calculate the time of application of different vectors, consider Fig 4, depicting the position of different available space vectors and the reference vector ... leg B SPACE VECTOR PWM This section briefly discusses the space vector PWM principle This PWM method is frequently used in vector controlled and direct torque controlled drives In vector controlled ... 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...

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A fuzzy logic CC PWM three phase AC DC converter

Ngày tải lên : 03/01/2014, 19:44

... introducing: 111 VOLTAGE AND POWER FACTOR CONTROL are the vectors of the rectifier input voltages and currents, and P(t) = [Pa 0) PbW Pc cor is the vector of the switching functions On the other hand, from ... inductive elements (i.e the transformer inductance or other inductance included to make the system working properly) and the DC side capacitive element With these conservative elements connected ... ideal PWM rectifier, the system can be studied as a parallel between a current and a voltage source connected by means of the black box that controls the energy flow (Fig 2) In effect, the voltage...

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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

... three -phase voltage-type P W M rectifier having the function of an active power filterhas been investigated and its effectiveness has been confirmed using a thee -phase diode bridge rectifier with ... the rectifier input currents i, , iv and Active Filtering Operation For 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 ... PWM rectifier with active filtering function", IEEJ SPC- 96 (107), 11-20 ( in Japanese) KataokaT, Murota 1, Fuse Y, Nakajima D and Nishikata S 1999, A Single -phase Voltage-Type P W Rectifier with...

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

Ngày tải lên : 03/01/2014, 19:45

... of voltage vectors consisting of the two active vectors adjacent to the EMF vector and the zero voltage vector are considered for optimization without loss of quality [8] c) Trajectory tracking ... THREE -PHASE VS-PWM CONVERTERS While phase voltages can be controlled independently, phase currents are determined not only by their own phase voltage, but also by those of other phases Thus, a phase ... 0:05) (a) Output currents (b) Phase current error (c) Vector current area (d) Output vector current loci 698 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL 45, NO 5, OCTOBER 1998 Fig Decoupled,...

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Chapter 12 fully controlled three phase bridge converters

Ngày tải lên : 16/02/2014, 18:53

... FULLY CONTROLLED THREE -PHASE BRIDGE CONVERTERS State State Sector State Sector 7,8 Sector State State Sector mq axis Sector Sector State State md axis Figure 12.7-1 Space-vector diagram TABLE 12.7-1 ... a three -phase bridge supplies a wye-connected load consisting of a 2-Ω resistor in series with a 1-mH inductor in each phase The dc voltage is 100 V and the frequency is 100 Hz The a -phase voltage ... simultaneously In the second, the switching between phases is staggered The second method is preferred because it provides slightly higher bandwidth and is more robust with respect to electromagnetic...

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

Ngày tải lên : 16/03/2014, 22:20

... these factors deﬁne the process efﬁciency from a point of view of the reaction performance and the energy input demanded for the reactor functioning With regard to the effective and compact reactor ... noncompetitive, with or without dissociation), and different reacting mechanisms (only adsorbed species react with each other, or one of the reactants is not absorbed being free in the liquid phase and reacts ... Bed porosity friction factor Effectiveness factorg ¼ rV =rtrue Viscosity of the gas phase, NÁs/m2 Viscosity of the liquid phase, NÁs/m2 Molar mass of gas, kg/mol Density of the gas phase, kg/m3...

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Báo cáo "Determining thermal expansion coefficients of three-phase fiber composite material reinforced by spherical particles " potx

Ngày tải lên : 28/03/2014, 13:20

... matrix phase with particle phase in order to creat a new matrix phase, called effective matrix phase In fact, this effective matrix phase is assumed as a spherical particle - reinforced composite ... particle phase K , K : bulk moduli of matrix and particle phase G2 = µ2 : shear modulus of matrix phase ξ3 : volume fraction of particle phase α2 : thermal expansion coefficient of the effective ... the three -phase problem is that we convert it into two two - phase problems, then combine them in order to give final results Firstly, we combine original matrix phase with particle phase in order...

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Báo cáo " Three-phase polyme nanocomposite material " doc

Ngày tải lên : 28/03/2014, 13:20

... Three -phase polyme nanocomposite material 17 only receive a new better material but also reduce noticeably energy resource needed for the producing process Metal materials plated with nano ... cumbersome mine-detector, nowadays America has begun applying nano technology to manufacture 7.5 cm-diameter mine-inspector robots Owing to applying nano technology, microchips with very large memory ... ways to create nano structure The first one is “From bigger to smaller”, for example people “grind” the bigger structure until they get the expected smaller ones The second is “Turn one into...

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Báo cáo Y học: Human sprouty 4, a new ras antagonist on 5q31, interacts with the dual speciﬁcity kinase TESK1 potx

Ngày tải lên : 31/03/2014, 15:20

... ampliﬁed by PCR with forward primer 5¢-CTAGTCGACATGCTCAGCC CCCTCCCC-3¢ and reverse primer 5¢-GGAATTCCT GTCAGAAAGGCTTGTCGG-3¢, creating SalI and EcoRI restriction sites (underlined), respectively, and ... b-galactosidase staining Cotransfection of full-length TESK1 cDNA, cloned in frame with the GAL4 AD into vector pAct2, with GAL4 DNA BD-hspry4 cDNA in vector pMD4 also yielded colonies under selective ... residual ras activation in nontransfected cells was still sufﬁcient to activate Raf Hspry4 interacts with testicular protein kinase In search of partners, which might reveal its mechanism of action,...

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Three phase a c circuits

Ngày tải lên : 03/04/2014, 20:52

... Electrical and Electronic Principles Worked Example 3.5 Q A balanced delta-connected load takes a phase current of 15 A at a power factor of 0.7 lagging when connected to a 115 V, 50 Hz, three -phase ... star-connected load of phase impedance 25 and power factor 0.75, supplied from the delta-connected secondary of a 3 -phase transformer The turns ratio of the transformer is 20:1, and the star-connected ... star-connected load is supplied from a 3 -phase, 415 V source The three phase loads are purely resistive These loads are 25 , 30 and 40 , and are connected in the red, yellow and blue phases respectively...

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IEC 60909 3 short circuit currents in three phase a c systems currents during two separate sim

Ngày tải lên : 04/04/2014, 11:58

... earthed conductors and earth is nearly constant Its magnitude depends on the reduction factor r Copyright International Electrotechnical Commission Provided by IHS under license with IEC Document ... (4) voir les directives CCITT Directives concernant la protection des lignes de tộlộcommunication contre les effets prộjudiciable des lignes ộlectriques et des chemin des fers ộlectrifiộs, Volume ... derivation of Equation (4) see CCITT Directives concerning protection of telecommunication lines against harmful effects from electric power and electrified railway lines, Volume V: Inducing...

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Neutral current compensation in three phase, four wire systems a review

Ngày tải lên : 11/05/2014, 22:06

... switch legs are connected to the three phase conductors through a series inductance while the fourth switch leg is connected to the neutral conductor with an optional inductor This topology is ... of compensator Effect of location on compensating characteristics Effect of source impedance on compensating characteristics Effect of buffer reactor (Zn) on compensating characteristics Design ... is connected in parallel with the load and a single -phase pulse-width-modulation (PWM) APF is connected in series with the neutral conductor Proper operation of PWM APF increases the effectiveness...

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FPGA BASED SVPWM CONTROLLER FOR THREE PHASE AC AC MATRIX CONVERTER

Ngày tải lên : 14/05/2014, 22:37

... Power Electronics Association [4] Lászó Huber and Dusan Borojevic, “Space vector modulated three -phase to three -phase matrix converter with input power factor correction” IEEE Transactions On ... Transactions on Power Electronics, Vol 4, no 1, pp.101-112, January 1989 [3] D casadei - G.gandi – G.serra – A.Tani, “Space vector control of matrix converters with unity input power factor and ... Transactions On Industrial Electronics, Vol.49, No.2, april 2002 [6] LarsHelle, KimB.Larsen, Allan Holm Jorgensen, StigMunkNielsen, “Evaluation of Modulation Schemes for Three -Phase to Three-Phase...

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Báo cáo hóa học: " Automatic Characterization of Myocardial Perfusion in Contrast Enhanced MRI" pptx

Ngày tải lên : 23/06/2014, 01:20

... The mean processing time was 90.83 second Automatic Characterization of Myocardial Perfusion in Contrast Enhanced MRI 419 Table 2: Algorithm robustness with respect to the user input Operator X ... deﬁned to be a vector ﬁeld v(x) that minimizes the following functional: ε= µ|∇v|2 + |∇I |2 |v − ∇I |2 dx (9) Automatic Characterization of Myocardial Perfusion in Contrast Enhanced MRI The optimal ... as absolute values and as relative values with respect to the input function for both original and normalized T/I curves Manual correction of the ERF function is available: the user can manually...

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