variable speed generatorsch (3)

... 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 C p at the given speed. In the ... 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...

Ngày tải lên: 21/03/2014, 12:14

... Generators Ion Boldea Variable Speed Generators Ion Boldea The ELECTRIC POWER ENGINEERING Series Series Editor Leo L. Grigsby © 2006 by Taylor & Francis Group, LLC VARIABLE SPEED GENERATORS ION ... 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)...

Ngày tải lên: 21/03/2014, 12:14

... the speed ω m is as follows: (1.1) where p 1 is the number of pole pairs Ω R is the mechanical rotor speed ωωωω mmR p=± =⋅ 12 1 ; Ω © 2006 by Taylor & Francis Group, LLC 1-20 Variable Speed ... 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 l...

Ngày tải lên: 21/03/2014, 12:14

... 3-10 Variable Speed Generators It should be noted that the oversizing of the inverter to produce unity power ... Page 11 Tuesday, September 27, 2005 1:48 PM © 2006 by Taylor & Francis Group, LLC 3-12 Variable Speed Generators with (3.50) Though the maximum rotor teeth flux density is rather large (2.2 ... Page 13 Tuesday, September 27, 2005 1:48 PM © 2006 by Taylor & Francis Gr...

Ngày tải lên: 21/03/2014, 12:14

... 4.13 [16]. A rather wide speed range 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 ... & Francis Group, LLC frequency output at variable speed, for autonomous and power grid operation, will be treated in Chapter 5. 4-20 Variable Speed Generators The eq...

Ngày tải lên: 21/03/2014, 12:14

... 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 ... 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 hea...

Ngày tải lên: 21/03/2014, 12:14

... 6.17). The effect is notable only at high speeds, where, © 2006 by Taylor & Francis Group, LLC 6-18 Variable Speed Generators At least for constant speed synchronous generators with discontinuous ... 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...

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 ... a speed observer is also needed. As speed control is not imperative at very low speed, sensorless DTFC without signal injection was proven to produce fast and safe torque response a...

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 8-22 Varia...

Ngày tải lên: 21/03/2014, 12:14

... mode should switch from case (3) below base speed, to case (2), and case (1) as speed increases. The energy conversion is not uniformly good, but the constant power speed range may be increased, ... V Veh icle speed i n km/h Dri ve torque in Nm © 2006 by Taylor & Francis Group, LLC 9-2 Variable Speed Generators In vehicular applications, an SRG is required to perform over a...

Ngày tải lên: 21/03/2014, 12:14