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COMPARISON OF DYNAMICS OF DOUBLY-FED INDUCTION MACHINE CONTROLLED IN FIELD- AND ROTOR-ORIENTED AXES
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| Author(s) |
A. M. Walczyna |
| Abstract |
Current control of a doubly-fed induction machine allows directly access amplitude and phase of rotor and stator vectors both in static and in dynamic conditions. The best properties are obtained when control in rotating synchronously set of axes is applied as then the MDZ is described by a set of stationary differential equations. A drive system with current control in x-y axes oriented by stator voltage vector has been described in the previous works of the author. The main disadvantage of such a system is its complexity. Considerably simpler structure of DFM control is obtained after application of an induction machine description in rotor d-q axes. In the paper a structure and dynamic properties of such control system are presented and compared with properties of the previous one. In order to obtain good steady-state and dynamic control of rotor currents in d-q axes efficient decoupling of influence of strong disturbances acting at rotor terminals (rotor EMF) should be applied. In the paper efficiency of decoupling of these signals is discussed. It is shown that application of decoupling can cause instability of the drive. It is also shown that application of feed-forward compensation significantly improves control of rotor currents in d-q axes. |
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| Filename: | Unnamed file |
| Filesize: | 3.077 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-13 by System |
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