Page 271 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

258 Renewable Energy Devices and Systems with Simulations in MATLAB and ANSYS ®
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Wind

Gearbox IG Bus
Transformer Grid

PFC
Capacitors

(a)

Wind

Gearbox IG Bus
Transformer Grid

PFC
Variable Capacitors
resistor
(b)

Wind

Gearbox
DFIG Bus Grid
Transformer

Power
Thyristor converters

Crowbar
resistors
(c)

Wind

PMSG Bus Grid
Transformer

Power
converters

(d)

FIGURE 10.5 Commercially available wind turbine systems. (a) Fixed speed induction generator based
system. (b) Variable speed induction generator with resistance control based system. (c) Variable speed doubly
fed induction generator based system. (d) Variable speed back-to-back double pwm front end based system for
permanet magnet synchronous generators.