Variable speed drives Altivar 71 pot
pratice variable speed and dirves power electronic
... speed drives that control the speed of DC motors are loosely called DC variable speed drives or simply DC drives and those that control the speed of AC motors are called AC variable speed drives ... hydraulic variable speed control methods, electrical variable speed drives are those in which the speed of the electric motor itself, rather than an intermedia...
Ngày tải lên: 08/09/2013, 21:03
Tài liệu Ecodial V3.38 Low-voltage electrical installation design software Fupact and variable speed drive ppt
... representations: b Variable speed integrated Ecodial V 3.37 already carried out the new products of the Altivar range: Altivar 11, 21, 31, 38, 61, 71. Ecodial V3.38 now also offers the 08, 28 & 68 Altivar ... 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...
Ngày tải lên: 12/12/2013, 13:15
DC bus control of variable speed wind turbine using a buck boost converter
... 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-controlle...
Ngày tải lên: 03/01/2014, 19:15
New control strategy for variable speed wind turbine with DC DC converters
... "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, ... power in above rated wind speeds. This control acts directly upon an additional hydraulic system and is very important to protect the blades from breaking. The speed control algori...
Ngày tải lên: 03/01/2014, 19:15
Báo cáo khoa học: "Latent variable models of selectional preference" potx
... Each model has at least one vocabulary of Z arbitrar- ily labelled latent variables. f zn is the number of observations where the latent variable z has been associated with the argument type n, f zv is ... than the same model on seen adjective-noun data. Latent variable models that use E M for infer- ence can be very sensitive to the number of latent variables chosen. For example, the per...
Ngày tải lên: 07/03/2014, 22:20
variable speed generatorsch (1)
... 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. ... 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...
Ngày tải lên: 21/03/2014, 12:14
variable speed generatorsch (2)
... 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 -...
Ngày tải lên: 21/03/2014, 12:14
variable speed generatorsch (3)
... 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...
Ngày tải lên: 21/03/2014, 12:14