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This paper presents a quantitative analysis of the advantages of a grid connected doubly fed induction generator (DFIG) for wind energy conversion systems (WECS) over the other available variable speed WECS. The WEC system includes back-to-back connected PWM voltage source converters (VSC) in the rotor circuit of the DFIG. The control strategy implemented is - unity power factor operation of the machine...
This paper presents a proposed modeling and numerical simulation of the speed control ac series motor fed from pulse width modulated ac chopper voltage control. The advantage of this system is its high power factor and less total harmonic distortion factor of the motor current. The digital simulation of this system is described the system behavior in the transient and steady - state conditions. The...
The paper proposes novel FACTS based stabilization scheme for maximum energy utilization of a tidal energy system using particle swarm optimization PSO search technique. PSO is implemented in the control of a hybrid low cost dynamic filter/capacitor compensation DFC and static VAR compensator SVC (TCR+FC) scheme. The dynamic self regulating control method uses real time error to stabilize the tidal...
This paper proposes and describes the controllers for doubly-fed induction generators (DFIG) with series grid side converter. It is demonstrated that with series grid side converter instead of a conventional shunt grid side converter the DFIG stator voltage can be kept balanced even under heavy unbalance grid voltages. Therefore, in this way it is avoided the undesired effects such as torque oscillations...
The doubly-fed induction generator (DFIG) is a 'special' variable speed induction machine widely used in modern large wind turbines. It is a standard, wound rotor induction machine with its stator windings directly connected to the grid and its rotor windings connected to the grid through a back-to- back PWM converter. The DFIG power generation consists of power delivered from two paths, one from...
The current source back-to-back converters have been largely neglected because of the slow transient response and low power factor, which is mainly resulted from a fixed PWM pattern and a poor control method. However, current source converters have intrinsic advantages such as the high reliability and the inherent current limiting capability. Due to these advantages, more and more people have been...
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