On the Possibilities of Using a Brushless Doubly-Fed Reluctance Generator in a 2 MW Wind Turbine

Sensored and sensorless speed control methods for brushless doubly fed reluctance motors

“…at zero secondary frequency) of the BDFRM. However, no journal publication has subsequently appeared to reinforce the originality, and significance of the practical verification, of the sensorless speed and DTC for the BDFRM operation at unity primary power factor achieved in [3,13,14]. This paper will attempt to fill this void by reproducing the major outcomes of this experimental work.…”

“…The theoretical considerations presented in [26,27] have concerned with sensorless field-oriented control and DTC, respectively. The simulation studies carried out in [14,27] have been validated on a real machine for the first time in [3,13,14]. The test results from the latter conference papers have demonstrated how a rotor position/speed estimation technique and a conventional load model-based angular velocity observer [28] can be effectively used for accurate sensorless speed control down to synchronous speed (i.e.…”

“…It can work as a conventional IM (which represents an important 'fail-safe' feature in case of the inverter failure) or as a fixed/ adjustable speed synchronous turbo-machine [9] meaning that high-speed, field-weakened traction applications [10] and high-frequency generators [11] become feasible. From a control viewpoint, one important merit of the machine is that one can not only control its torque, but also the power factor (however, a larger inverter would be required in this case) [3,[12][13][14], efficiency [2] or any other performance parameter of interest in an inherently decoupled fashion [15]. gear and slip rings is a clear advantage over a conventional doubly excited wound rotor induction machine (DEWRIM) in applications where increased reliability and lower maintenance requirements are crucial factors (for example, off-shore wind generators [16]).…”

Flux observer algorithms for direct torque control of Brushless Doubly-Fed Reluctance machines

“…The Brushless Doubly Fed Reluctance Machine (BDFRM) has been investigated during the last decade as a potential alternative to the existing solutions in variable speed applications with narrow speed ranges [1]- [8]. The main motivation for this increasing interest has been found in its modest cost and brushless structure as well as competitive performance relative to other self-cascaded counterparts i.e.…”

“…the conventional doubly-excited wound rotor induction machine (DEWRIM) or a cage rotor cousin, the brushless doubly-fed induction machine (BDFIM) [9], [10]. As a member of the slip-power recovery family of machines, the BDFRM allows the use of a partially-rated inverter which, for a typical speed range of 2 : 1 in pump drives or wind turbines [3], [8], may be rated up to about 25% of the machine rating [1]- [3].…”