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This paper presents an enhanced direct power control (DPC) algorithm for doubly fed induction generators (DFIG) capable of reducing the common mode voltage (CMV). Nowadays the DFIG is often used in high power wind energy conversion systems (WECS). A common problem of converter fed induction machines are the bearing damages due to the bearing currents. The source of this problem is the common mode...
The high penetration level of wind power generation in an interconnected electrical network carries new technical challenges regarding system stability. Despite the stochastic nature of the wind, grid reliability has to be guaranteed. In compliance with power companies' new requirements on wind turbines as regards contribution to voltage regulation, this paper proposes a reactive power controller...
Servo drives comprise a significant potential of energy saving which has not been considered sufficiently up to now. Simple changes in the motion control of energy optimal and jerk limited motions can be implemented which lead to a reduced acceleration rms-value and slightly increased maximal acceleration. The resulting reduction factors for dimensions and moved masses lead even to further savings...
High penetration level of wind power generation in the interconnected electrical network and the increasing rated power of the wind energy converter units imposes new technical challenges to engineers. The first one is to guarantee grid stability despite the stochastic nature of wind while the second one is to limit the power losses since electrical machines efficiency do not augment proportionally...
Nowadays the doubly fed induction machine (DFIG) is often used as a generator in high power wind energy systems. Advantages in comparison to a synchronous generator are the small size of the converter and the viable alternative to adjust speed over a wide range. Decoupled control of active and reactive power can be realized using a dynamic model of the DFIG. Instead of a classic space vector modulation...
Nowadays the doubly fed induction machine is often used as generator in high power windenergy systems. Because of the use of two converters in the generator's rotor circuit bearing damages can occurred specially for this type of machine. So the aim is to reduce the common mode voltage as one cause of bearing currents. Instead of a classic space vector modulation this paper presents the simulation...
This paper deals with control techniques for reduction of the losses in doubly-fed induction generator drives. This type of machine is one of the most used in wind power. The proposed method achieves its goal through controlling the decoupled active and reactive power flow on the machine and on the converters. Depending on the operating point and on the desired power factor optimal reactive currents...
Magnetically levitation of rotors requires accurate measurement of the shaft location. Commonly used position sensors are mounted externally, which can cause system instability. Therefore, an integrated capacitive measurement system has been developed which allows determination of the rotor position exactly in-plane with the magnetic bearing. Sensor noise is reduced significantly by means of an adaptive...
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