25-01-2013, 04:38 PM
Implementation Of Rotor Current Controller Using Wind Electric Generator
Implementation Of Rotor.ppt (Size: 574.5 KB / Downloads: 63)
ABSTRACT
The developed torque of the wind turbine fluctuates with the change of wind speed which provides more fatigue on the turbine blades and overloads on the electric machine.
This paper presents the effect of rotor current control of wound rotor induction generator driven by wind turbine during different operation modes when varying the rotor resistance.
The rotor current is measured and controlled to provide constant torque from the turbine on the machine.
The studied modes are wind speed variations, starting especially at high wind speed.
Moreover, the effect of the proposed control on short circuit and critical fault clearing time is investigated.
This technique will reliefs pitch regulator duties, will provide soft starting of the machine and reduces torque and power fluctuations.
EXISTING SYSTEM
The optimal pitch optimal slip is one of the most attractive aspects economically and technically, therefore, it has been studied from different points of view in the last few years. Several studies have been proposed in the literature and might be suitable for particular applications.
Circuit current is high and transient response Is low.
In case of high wind speed starting of wind turbine without added rotor resistance, the power inrushed and decayed to zero.
PROPOSED SYSTEM
The wind turbine is the system which converts the wind available energy into mechanical energy.
This paper presents a comparative study between squirrel cage pitch controlled and variable speed slip and pitch control wind turbines .
The proposed study in which is based on modeling the different control techniques of variable speed induction generators during small disturbances such as wind speed variation.
From the proposed case studies in this paper, one can say that the rotor current control or the rotor resistance control system for low power wind turbines is very economical and simple control technique.
ADVANTAGES
The output response from constant torque, constant equivalent circuit was compared against constant rotor current control techniques
It improves the transient response of the system during starting and reduce the torque and the power flickers during wind gusts and variations which provide long life time of wind turbine.
It also reduces the short circuit current with increasing the critical clearing fault time which means lowest braking capacity with long clearing time for protection systems.
APPLICATIONS
Wind energy became one of the most important renewable energy resources, it has a great share in total power generation all over the world and its environmental is friendly.