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Positive and Negative Sequence based Sensorless Control for Stand-Alone Slip-Ring Generator
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| Author(s) |
Grzegorz Iwanski, Wlodzimierz Koczara |
| Abstract |
A stand alone power generation system with
doubly fed induction generator and its control method is
presented in the paper. A slip-ring induction generator is
equipped with the stator connected capacitances for filtering
the switching frequency harmonics produced by the rotor
connected power electronics converter. The proposed Direct
Voltage Control method, based on the stator voltage vector
reference, provides fixed frequency and amplitude of the
generated stator voltage operation. Different types of load
(linear nonlinear) can be supplied keeping high quality
voltage. A star connected stator provides the four wires
system, supplying a single phase or unbalanced load.
However the high load asymmetry produces the unbalanced
stator voltage and in this case the additional part of the
voltage control method is necessary for voltage asymmetry
correction. As the main part of the control method bases of
the positive sequence component of the stator voltage vector,
the asymmetry correction algorithm bases on the negative
sequence components. To extract both positive and negative
sequence components of the stator voltage vector, two
independent rotating frames are used. The coordinates
systems rotates in opposite directions with synchronous and
counter to synchronous angular speed. A PSIM software is
used for control method design and prototyping. A proposed
stand alone power generation system was build and tested.
The developed stator voltage control with voltage
asymmetry algorithm is proved by simulations and by
oscillograms from laboratory tests. |
| Download |
| Filename: | T11-402.pdf |
| Filesize: | 488.2 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-13 by System |
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