series variable speed drive

... & 68 Altivar series. These new products enrich the motor starter catalogue. Users are able to choose between direct on-line, start delta, soft starters and variable speed drives. b Among ... V3.38 Low-voltage electrical installation design software Building a New Electric World Fupact and variable speed drive integrated For further details concerning Ecodial V3.38, ask your Schneider Electric ... (standard): DIN (or NH), NFC, BS v Fuse model: aM, gG, gM, Diazed v New representations: b Variable speed integrated Ecodial V 3.37 already carried out the new products of the Altivar range:...

Ngày tải lên: 12/12/2013, 13:15

Ngày tải lên: 28/06/2014, 16:20

Ngày tải lên: 28/06/2014, 16:20

Ngày tải lên: 08/09/2013, 21:03

... Operation modes of buck boost converter 2 Unlike constant -speed control, a variable- speed control can adjust the speed of the turbine as the wind speed changes, so as to operate at the peak of the ... Inverter-Based Variable Speed Wind Turbine Systems” IEEE Tran. Power Elec, Vol.19, Issue 5, pp. 1242– 1249, Sept. 2004 [11] E. Muljadi and C. P. Butterfield, “Pitch-controlled variable- speed wind ... rotor speed Fig. 1. Power coefficient versus tip -speed ratio. Fig.3 : Connection diode rectifier circuits to the generator. 5 V. CONCLUSION The maximum power transfer from variable...

Ngày tải lên: 03/01/2014, 19:15

... profile Wind turbine Drive train PMSG Diode rectifier Boost converter LOAD P electSpeed Duty ratio VSWT Aero dynamical / Mechanical unit MPPT LPPT Operator Controller speed d Control strategy VSWT ... "Control of a permanent magnet synchronous generator used in a variable speed wind energy system," IEEE Electric Machines and Drives Conference, 2001. IEMDC 2001, vol., no., pp.872-877, ... diode rectifier and of DC-DC converter, the speed control is achieved by the non- inverting buck-boost converter. The reference signal for the converter drive is derived from the power point tracker....

Ngày tải lên: 03/01/2014, 19:15

Ngày tải lên: 03/01/2014, 19:45

... Generators Ion Boldea Variable Speed Generators Ion Boldea The ELECTRIC POWER ENGINEERING Series Series Editor Leo L. Grigsby © 2006 by Taylor & Francis Group, LLC vii variable speed. Design and ... Data 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) 1. Variable speed generators. ... applied to very low -speed (down to 10 rpm or so) wind or hydraulic turbine direct drives or to medium -speed automotive starter-alternators or wind and hydraulic turbine transmission drives. • reciprocating...

Ngày tải lên: 21/03/2014, 12:14

... 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 ... constant f 2 , V r - variable WRIG ω m Slip rings Brushes (d) P m = ∑losses – P s + P r P s Stator electric Power f 1 – ct V s – variable Rotor electric power output P r V r - variable f 2 ... frequency output, the rotor frequency ω 2 has to be modified in step with the speed variation. This way, variable speed at constant frequency (and voltage) may be maintained by controlling the...

Ngày tải lên: 21/03/2014, 12:14

... through speed is increasing and the wind speed remains constant (see the characteristics in Figure 2.18). Figure 2.25a through Figure 2.25e. © 2006 by Taylor & Francis Group, LLC 2-44 Variable Speed ... are used as variable- speed generators connected to a strong or a weak power grid or as motors in the same conditions. Moreover, WRIGs may operate as stand-alone generators for variable speed. In ... LLC 2-22 Variable Speed Generators and θ s have to be estimated. The rotor position is needed. Rotor speed ω r is also needed, both in the voltage decoupler and for prime-mover speed control....

Ngày tải lên: 21/03/2014, 12:14

... = 0.0062 (q = 4, β = 5/6) from Figure 3.7: © 2006 by Taylor & Francis Group, LLC 3-20 Variable Speed Generators As the skin effect was shown small, it will be considered only by the correction ... Page 20 Tuesday, September 27, 2005 1:48 PM © 2006 by Taylor & Francis Group, LLC 3-18 Variable Speed Generators X sl = ω 1 L sl = 2 π × 50 × 0.257 × 10 −3 = 0.0807 Ω . The rotor end ... performed at maximum power at maximum (supersynchronous) speed. The torque is about the same as that for stator rated power at syn- chronous speed (with DC in the rotor). • The electromagnetic design...

Ngày tải lên: 21/03/2014, 12:14

... by Taylor & Francis Group, LLC 4-16 Variable Speed Generators FIGURE 4.12 Torque speed curves for the 4/6 pole combination. FIGURE 4.13 Line voltage /speed with C = 100 µF for a 4/6 pole self-excited ... applications such as wind machines, where the power decreases with cubic speed, variable speed is desirable when the wind speed decreases notably. Pole-changing SEIGs may handle such situ- ations ... calculat e the f ollowing: (from Figure 4.24) is as follows: 4-34 Variable Speed Generators In Equation 4.97, an additional variable inductance (X L ) is placed in parallel with the fixed excitation capacitor...

Ngày tải lên: 21/03/2014, 12:14

... voltage. For variable speed operation, the terminal voltage is kept proportional to speed, as the DC (capacitance) voltage does. For induction motors, this is equivalent to V/f, variable frequency ... 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 large ... of pumping operation, that needs variable speed during generating periods to eliminate the speed governor and provide for good overall turbine efficiency for variable water heads. FIGURE 5.11...

Ngày tải lên: 21/03/2014, 12:14

... 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 ... & Francis Group, LLC 6-24 Variable Speed Generators A switched diode rectifier may also be used to boost the generator voltage at low speeds and buck it at high speeds, in order to increase ... increase with speed up to a point and then level out, while the stator iron losses slowly decrease with speed after a peak. The stator current has an increasing demag- netization effect as speed increases...

Ngày tải lên: 21/03/2014, 12:14

... by Taylor & Francis Group, LLC 7-24 Variable Speed Generators The rotor speed comes as the difference between the rotor flux vector speed and the slip speed. An exact value of rotor resistance ... motion-sensorless control is preferred. 7.7 ISA Design Issues for Variable Speed There are a few design peculiarities to ISA design for variable speed. We already mentioned a few in previous paragraphs. ... September 27, 2005 1:52 PM © 2006 by Taylor & Francis Group, LLC 7-32 Variable Speed Generators • As in any variable speed system, the performance and costs prevail. This way, the fundamental frequency...

Ngày tải lên: 21/03/2014, 12:14

... motoring, in the same cases. The typical torque /speed and voltage /speed envelopes are given in Figure 8.20. The base speed ω b is defined as the maximum speed for which the peak (starting) torque ... 0.2 Base speed Speed (P.U.) Torque Power and voltage 1 2 3 4 5 6 7 8 9 10 w max w b w r w b V smax V s T e T b P P b © 2006 by Taylor & Francis Group, LLC 8-40 Variable Speed Generators • ... constant power speed range with small machine oversizing and 40% converter oversizing, it fails to comply with 150% maximum speed emf conditions and especially fails to avoid UCG at high speeds. Designing...

Ngày tải lên: 21/03/2014, 12:14

... Group, LLC 9-30 Variable Speed Generators 9.9 Rotor Position and Speed Observers for Motion-Sensorless Control In the control schemes so far presented, the rotor position and speed are provided ... position (rads.) Actual speed (rads/sec) Estimated speed (rads/sec) Time, t in secs (a) (b) 38.5 39 39.5 40 600 400 200 0 0510 Time, t in secs Actual speed (rads/sec) Estimated speed (rads/sec) 15 ... principle, it does not provide rotor position estimation at low speed and up to the speed when emf methods may be used. At low speeds, including standstill, choosing an idle phase, a small AC...

Ngày tải lên: 21/03/2014, 12:14

... frequency at variable speed reversal machines (FRMs) conceived for low speed and high torque density will be discussed in Chapter 11. © 2006 by Taylor & Francis Group, LLC 10-34 Variable Speed Generators In ... 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 ... × 14 V DC battery Variable speed is used to reduce fuel consumption (Figure 10.40) [24] or to reduce thermal engine © 2006 by Taylor & Francis Group, LLC 10-4 Variable Speed Generators (Figure...

Ngày tải lên: 21/03/2014, 12:14

... Introduction There are certain applications, such as direct-driven wind generators, that have very low speeds (15 to 50 rpm) and microhydrogenerators with speeds in the range of up to 500 rpm and power up ... apparent answer to this latter question is negative. f p n n speed rps nnn11 =⋅ −;() © 2006 by Taylor & Francis Group, LLC 11-34 Variable Speed Generators The slot bottom width b 1 is, approximately, The ... 2 200 2 128 60 1 228 60 244 95 091 + = . . © 2006 by Taylor & Francis Group, LLC 11-14 Variable Speed Generators The electromagnetic power, P elm , is (11.36) The winding losses are about...

Ngày tải lên: 21/03/2014, 12:14

Ngày tải lên: 21/03/2014, 12:14