plsv variable speed pulse output

... fundamentals in variable speed drives including motion concepts, torque speed curves, types of variable speed drives, mechanical variable speed drive methods and electrical variable speed drive methods ... hydraulic variable speed control methods, electrical variable speed drives are those in which the speed of the electric motor itself, rather than an intermediary device, is controlled Variable speed ... full-load torque output is possible over the normal speed range, even at standstill (zero speed) • The output power is zero at zero speed In the normal speed range and at constant torque, the output power...

Ngày tải lên: 08/09/2013, 21:03

... SwitchDisconnector disconnector or fuse alone Switchdisconnector or fuse alone Disconnector b Variable speed integrated Ecodial V 3.37 already carried out the new products of the Altivar range: ... starter catalogue Users are able to choose between direct on-line, start delta, soft starters and variable speed drives b Among other features v Reminder: A.52-10 to 13 IEC60364 table (current-carrying...

Ngày tải lên: 12/12/2013, 13:15

... versus tip -speed ratio Fig.3 : Connection diode rectifier circuits to the generator Unlike constant -speed control, a variable- speed control can adjust the speed of the turbine as the wind speed changes, ... ∆α i+1 Fig.7: Wind turbine output power without MPPT control method for low wind speed Fig gives the wind turbine output power without MPPT control method at low wind speed In this case, one notices ... turbine output power with MPPT control method at low wind speed The use of the MPPT converter imposes a low DC bus voltage to recover the wind energy at the low winds speeds Fig.8: Wind turbine output...

Ngày tải lên: 03/01/2014, 19:15

... estimate precisely the mechanical torque and power, such as: the wind speed, the blade pitch angle and the rotor speed The wind speed is provided by a wind model Detailed wind models for complex ... buck-boost converter is controlled in boost mode, which is suitable for variable speed wind turbine operation The input and output converter voltages are shown in Fig 11, following lightly the changes ... Computation Wind speed [m/s] If (|ΔP(k)| < = P band) ω*(k) = ω*(k-1); else ω*(k) = ω*(k-1) + Δω*(k); Update; End; Output ω*(k) 6.5 5.5 0.4 0.6 0.8 1.2 1.4 1.6 1.8 1.6 1.8 Time [s] Fig 10 Wind speed Fig...

Ngày tải lên: 03/01/2014, 19:15

... Short Synchronous Generators Ion Boldea Variable Speed Generators Ion Boldea © 2006 by Taylor & Francis Group, LLC The Electric Generators Handbook VARIABLE SPEED GENERATORS ION BOLDEA Polytechnical ... Boldea, I Variable speed generators / Ion Boldea p cm (The electric power engineering series) Includes bibliographical references and index ISBN 0-8493-5715-2 (alk paper) Variable speed generators ... allow for lower speed for lower power in the electric generators in order to better tap the primary fuel energy potential and increase efficiency and stability This is how variable- speed electric...

Ngày tải lên: 21/03/2014, 12:14

... voltage stator output power at variable speed if the rotor windings are controlled at variable frequency ( f2) and variable voltage The rotor frequency f2 is determined solely by speed n (rps) ... supersynchronous operation For constant frequency output, the rotor frequency ω2 has to be modified in step with the speed variation This way, variable speed at constant frequency (and voltage) may ... as an exciter from zero speed — demonstrated in this example — makes it a good solution when the excitation power is required from zero speed, as is the case in variable- speed large synchronous...

Ngày tải lên: 21/03/2014, 12:14

... optimization of the variable- speed wind turbine by tracking the optimal turbine speed at a given wind speed The result of the optimization is the optimal power efficiency Cp at the given speed In the ... operation (super- and undersynchronous speed) also need to be investigated as a means for WRIG control for constant stator voltage and frequency, for limited variable speed range Vector or direct power ... Page Tuesday, September 27, 2005 1:46 PM 2-6 Variable Speed Generators By applying the space-phasor transformations, after the reduction to stator variables, we simply obtain the voltage currents...

Ngày tải lên: 21/03/2014, 12:14

... 5715_C003.fm Page Tuesday, September 27, 2005 1:48 PM 3-2 Variable Speed Generators For | Smax| = 0.1, Vr = 3.6 ⋅103 V (per phase), Vs = 18 ⋅10−3 / V (phase): ... (6), …,18 kV Rated stator frequency f1 = 50 (60) f Hz Rated ideal speed n1N = f1/p1 = 3000 (3600), 1500 (1800) Maximum (ideal) speed: nMax = p1 (1+ | Smax |) Maximum slip Smax = ±0.05, ±0.1, ±0.2, ... (at maximum speed) of up to 40 to 50 MW and voltage VN ≤ 4.2(6) kV Here we will consider the case of total 2.5 MW at 690 V, 50 Hz, VRN = VSN = 690 V, Smax = ±0.25, and rated ideal speed n1N =...

Ngày tải lên: 21/03/2014, 12:14

... 100 300 500 Output power (W) FIGURE 4.26 Load voltage vs output power © 2006 by Taylor & Francis Group, LLC 700 5715_C004.fm Page 30 Monday, September 12, 2005 3:33 PM 4-30 Variable Speed Generators ... mechanical torque, turbine rotor speed, and generator speed Some small oscillations are visible in the turbine rotor speed but hardly so in the generator rotor speed [29] For the same IG, accelerated ... highspeed side torque, and (c) low -speed side elasticity torque © 2006 by Taylor & Francis Group, LLC 5715_C004.fm Page 44 Monday, September 12, 2005 3:33 PM 4-44 WT voltage (p.u.) Variable Speed...

Ngày tải lên: 21/03/2014, 12:14

... may provide constant DC output voltage output at variable IG speed Again, the SCE is vector controlled IG voltage speed and capacitance voltage are kept proportional to speed (frequency) to maintain ... very useful to produce additional output above synchronous speed n1 = f1/p1 Alternatively, for lower speeds, the auxiliary winding may work alone at variable speed to tap the energy below 25% ... off-the-shelf device intended for variable speed drives with fast regenerative braking of large inertia loads The turbine was emulated by a variable speed drive in speed control mode Starting can...

Ngày tải lên: 21/03/2014, 12:14

... 5000 6000 Speed n(rpm) FIGURE 6.19 Influence of additional permanent magnets (PMs) on direct current (DC) output for the same stator © 2006 by Taylor & Francis Group, LLC 6-20 Variable Speed Generators ... low speed, while a (additional) diode rectifier works at high speed, on half the winding, to combine the advantages of both methods [13] The switches A and B are closed only for low speed The speed ... rectifier for low speed Switch B Diode rectifier for high speed FIGURE 6.24 Winding reconfiguration with controlled rectifier © 2006 by Taylor & Francis Group, LLC Load 6-24 Variable Speed Generators...

Ngày tải lên: 21/03/2014, 12:14

... Tuesday, September 27, 2005 1:52 PM 7-24 Variable Speed Generators The rotor speed comes as the difference between the rotor flux vector speed and the slip speed An exact ˆ value of rotor resistance ... PM 7-30 Variable Speed Generators V Vrated Pel (kW) B 10 0.866 C 7.326 kW for motoring A 0 500 1500 2000 6000 Engine speed (rpm) ISA speed (rpm) 6000 18000 FIGURE 7.21 Voltage for wide speed constant ... entire magnetization current range • As speed goes up, the machine cannot keep the peak torque past a certain speed, called the base speed ω rb , for which full output voltage of the PWM converter...

Ngày tải lên: 21/03/2014, 12:14

... 0.8 0.6 Torque 0.4 0.2 Base speed FIGURE 8.20 Torque, power, and voltage vs speed © 2006 by Taylor & Francis Group, LLC Speed (P.U.) 10 w max w r wb wb 8-22 Variable Speed Generators In general, ... motoring, in the same cases The typical torque /speed and voltage /speed envelopes are given in Figure 8.20 The base speed ωb is defined as the maximum speed for which the peak (starting) torque is ... Still, the speed has to be estimated Again, as precise speed control is not needed, the estimated speed is used for adjusting the reference flux Ψs∗ and reference torque Te∗ At low speeds, this...

Ngày tải lên: 21/03/2014, 12:14

... airgap) Actual current pulses (Figure 9.1b) may be made to rectangular shape at low speeds through adequate direct current (DC) output voltage chopping At high speeds, single pulse operation is inevitable ... speed θW ia A B θoff θon θc θoff Generator Motor ia Below base speed (a) Ψ θW = θc − θon T1 B Ψ θmax θc A Wr G + − Wmec M θon T2 i (b) (c) Imin Imax i (d) FIGURE 9.5 High -speed single voltage pulse ... 9.5 High -speed single voltage pulse and low -speed pulse- width modulator (PWM) voltage pulse operation: (a) waveforms, (b) phase converter, (c) single pulse energy cycle, and (d) energy cycle with...

Ngày tải lên: 21/03/2014, 12:14

... Grid-Connected Variable- Speed PMSG System Variable- speed use is good for extracting more prime-mover power (as in wind turbines) or for providing optimum efficiency for the prime mover by increasing its speed ... constant voltage and frequency output at variable speed by four-quadrant AC–AC static power converter P–Q control systems are all treated in separate sections Super-high -speed PM generator design ... battery backup or as a first stage in dual-stage AC–AC pulse- width modulated (PWM) converters with constant frequency and voltage output, for variable speed Let us consider here the case of diode rectifier...

Ngày tải lên: 21/03/2014, 12:14

... operation at variable speed is required, either an active front or PWM converter is provided on the machine side or a diode rectifier plus a © 2006 by Taylor & Francis Group, LLC 11-16 Variable Speed ... for unity power factor Now, the output power is only (P2′)cos ϕ =1 = ⋅ 473.40 ⋅ 647.5 = 530.29 kW © 2006 by Taylor & Francis Group, LLC (11.55) 11-18 Variable Speed Generators So, for the same ... very low speeds, as we feel that for speeds above 500 to 600 rpm, PMSGs with distributed or fractional (with tooth-wound coils) windings are already well established (Figure 11.14) The low-speed...

Ngày tải lên: 21/03/2014, 12:14

... 2006 by Taylor & Francis Group, LLC 12-38 Variable Speed Generators Output (KW) 60 50 40 30 20 10 100 200 300 400 Speed (Km/h) 500 FIGURE 12.35 Output vs speed of superconducting linear generator ... The average linear speed in LMA is rather low For example, for speed at f1 = 60 Hz and xm = 10 mm, the maximum speed U max = xmω r = 0.01 ⋅ 2π ⋅ 60 = 3.76 m/sec The average speed U av = 4xm f1 ... machine with independently variable excitation current It is the task of the diode rectifier plus the DC–DC converter, © 2006 by Taylor & Francis Group, LLC 12-36 Variable Speed Generators Stator...

Ngày tải lên: 21/03/2014, 12:14

... “Soft starters and variable speed drives” catalogue Functions Number of functions Number of preset speeds Number of I/O Analog inputs Logic inputs Analog outputs Logic outputs Relay outputs Communication ... starters and variable speed drives” catalogue 18 and 19 Presentation Variable speed drives for asynchronous motors Altivar 71 Applications 532537 The Altivar 71 range of variable speed drives ... pages 142 to 173 Presentation (continued) Variable speed drives for asynchronous motors Altivar 71 532726 Comprehensive offer The Altivar 71 range of variable speed drives extends across a range of...

Ngày tải lên: 28/06/2014, 16:20

... starting and stopping the drive • Before servicing the variable speed drive: - Disconnect all power - Place a “DO NOT TURN ON” label on the variable speed drive disconnect - Lock the disconnect in the ... cause tripping, requiring the addition of output filters Do not use surge arresters or power factor correction capacitors on the variable speed drive output CAUTION IMPROPER USE OF A BRAKING RESISTOR ... configuration: Analog voltage outputs • - 10 V c or -10/+10 V c bipolar analog output depending on software, load impedance greater than 50 kΩ or or Analog current outputs • Analog current output X-Y mA, X...

Ngày tải lên: 28/06/2014, 16:20

... ATV71  Performance in closed loop • Torque at speed is available in motoring or generating quadrant • Speed precision is 0,02%* of the nominal speed • Speed range 1000* • Band pass: – 0.37 to 2.2kW ... quadrant 11kW 0-5Hz) Summary Current vector control ATV71  Torque control mode Speed feedback Speed ramps + Speed loop Speed reference Torque controller ACC/DEC Apply torque Torque rampe Torque reference ... calculation Id Ω cons Speed Ramp + - Speed Regulation Id Ω est Current sensors Iq ref Current regulation Va Vd, Vq (d,q) Vb  (a,b,c) Vc PWM Motor Current/torque Limit + Integration Θs + Iq Speed Estimation...

Ngày tải lên: 28/12/2015, 17:07