Conference Paper

The use of doubly fed reluctance machines for large pumps and wind turbines

Sch. of Eng., Univ. of Northumbria, UK
DOI: 10.1109/IAS.2001.955947 Conference: Industry Applications Conference, 2001. Thirty-Sixth IAS Annual Meeting. Conference Record of the 2001 IEEE, Volume: 4
Source: IEEE Xplore


Brushless doubly-fed induction machines (BDFIMs) have been extensively researched over the last 15 years because of the possibility of using a partially rated inverter in many applications with limited speed variations. However, the special cage rotor construction and substantial rotor losses is one of the key deficiencies of these machines. A similar and extremely interesting machine, the brushless doubly-fed reluctance machine (BDFRM), has been largely ignored in comparison. This was mainly due to the fact that reluctance rotor designs were not capable of generating saliency ratios large enough to make the BDFRM competitive with other machines. However recent developments in reluctance rotors, spurred on by research into synchronous reluctance machines, have resulted in high saliency ratio cageless rotors that are economic to build. This, together with the promise of higher efficiency and simpler control compared to the BDFIM, means that further investigation of the BDFRM is warranted. This paper presents a comparative theoretical analysis of the important control properties and related machine performance/inverter size trade-offs for the BDFRM in the light of its most likely applications-large pump type adjustable speed drives and variable speed constant frequency wind power generation systems.

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Available from: R.E. Betz, Sep 09, 2014
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    • "). Therefore, in the range n rm = n syn ± 250 rpm, the power electronics required should only be rated at 20% of the BDFRM rating [3]. "
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    ABSTRACT: Direct Torque Control (DTC) has been extensively researched and applied to most AC machines during the last two decades. Its first application to the Brushless Doubly-Fed Reluctance Machine (BDFRM), a promising cost-effective candidate for drive and generator systems with limited variable speed ranges (such as large pumps or wind turbines), has only been reported a few years ago. However, the original DTC scheme has experienced flux estimation problems and compromised performance under the maximum torque per inverter ampere (MTPIA) conditions. This deficiency at low current and torque levels may be overcome and much higher accuracy achieved by alternative estimation approaches discussed in this paper using Kalman Filter (KF) and/or Sliding Mode Observer (SMO). Computer simulations accounting for real-time constraints (e.g. measurement noise, transducer DC offset etc.) have produced realistic results similar to those one would expect from an experimental setup.
    Preview · Conference Paper · Dec 2009
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    ABSTRACT: A real time implementation of direct torque control (DTC) (Takahashi, I. and Noguchi, T., 1986), with a position encoder, on a brushless doubly fed reluctance machine (BDFRM) (Liang, F. et al., 1991) is reported. The paper is the extension of papers reported at the same conference in previous years (Yu, J. et al., 37th UPEC, 2002; Yu and Jovanovic, M., 38th UPEC, 2003). Preliminary studies on experimental hardware show consistent results as predicted by computer simulations. The machine offline test is described, as are other hardware devices. The nonlinearity of stator inductance is shown. However, the linear machine model is still a valid approach in that stator inductance varies in a narrow range depending on rotor position. A real time digital controller has been designed based on BDFRM estimation techniques. The results show a promising control potential for BDFRM and will serve as the foundation for further studies, such as sensorless control.
    No preview · Conference Paper · Oct 2004
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    ABSTRACT: Not Available
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