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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...
Wind energy conversion systems using the doubly-fed induction generator (DFIG) are the most commercialized topology worldwide, because this technology uses converters dimensioned for ±30% of the system rated power, thus reducing the equipment cost. The direct connection of the DFIG stator to the electrical system increases its sensitivity to grid disturbances. In this context, this paper analyzes...
This paper presents the emulation of an isolated wind energy conversion system, which is composed by a doubly-fed induction generator, a back-to-back converter connected to its rotor, a LC filter to minimize the harmonic pollution in the generated voltage and an isolated three-phase load. In first instance, the test bench is described and its operational capabilities are introduced. Afterwards, the...
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...
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