Analysis and control of a cascaded doubly-fed induction generator

Patin, Nicolas; Louis, J. P.

doi:10.1109/iecon.2005.1569296

“…It should be noted that in a conventional DFIG, the connection to the rotor windings is made through slip-rings, which are less suitable for aero applications, due to their limited operational life and risk of sparking. Potential alternatives include brushless doubly-fed machines [42] and cascaded doubly-fed induction machines [43][44][45]. While their control is more complex, the discussions of power transfer in this paper remain largely applicable and could form the subject of further research.…”

Section: Discussionmentioning

confidence: 99%

The Doubly Fed Induction Machine as an Aero Generator

Feehally

¹

,

Apsley

²

2015

IEEE Trans. on Ind. Applicat.

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Modern aircraft require a robust and reliable supply of electrical power to drive a growing number of high power electrical loads. Generators are driven by a mechanical offtake from the variable speed gas turbine, while a constant frequency AC network is preferred. Here doubly-fed induction machines are advantageous since they can be controlled, through a fractionally rated converter, to decouple electrical frequency from the mechanical drive speed, making control of the network frequency possible. However, the converter must be suitably rated, according to drive speed range, electrical voltage and frequency regulation, and power requirements. This paper develops and validates a simulation model of the doubly-fed induction generator system, which is applied to find the power flow through the machine's stator and rotor connections over a wide mechanical speed range in order to size the converter. A field orientated control scheme is implemented, to provide standalone voltage and frequency regulation across a drive range of ±40% synchronous speed, on a purpose-built 6.6kW hardware test platform. Based on the mechanical speed range of an aero gas turbine and the identified converter sizing, the suitability of a doubly-fed induction generator for aero applications is appraised. It is shown that a converter rated at 18% of full system rating can be used to meet the aircraft electrical specifications, and offer a potential improvement in aircraft performance, with no additional mechanical components.

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“…It should be noted that in a conventional DFIG, the connection to the rotor windings is made through slip-rings, which are less suitable for aero applications, due to their limited operational life and risk of sparking. Potential alternatives include brushless doubly-fed machines [42] and cascaded doubly-fed induction machines [43][44][45]. While their control is more complex, the discussions of power transfer in this paper remain largely applicable and could form the subject of further research.…”

Section: Discussionmentioning

confidence: 99%

The doubly-fed induction machine as an aero generator

Feehally

¹

,

Apsley

²

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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Modern aircraft require a robust and reliable supply of electrical power to drive a growing number of high power electrical loads. Generators are driven by a mechanical offtake from the variable speed gas turbine, while a constant frequency AC network is preferred. Here doubly-fed induction machines are advantageous since they can be controlled, through a fractionally rated converter, to decouple electrical frequency from the mechanical drive speed, making control of the network frequency possible. However, the converter must be suitably rated, according to drive speed range, electrical voltage and frequency regulation, and power requirements. This paper develops and validates a simulation model of the doubly-fed induction generator system, which is applied to find the power flow through the machine's stator and rotor connections over a wide mechanical speed range in order to size the converter. A field orientated control scheme is implemented, to provide standalone voltage and frequency regulation across a drive range of ±40% synchronous speed, on a purpose-built 6.6kW hardware test platform. Based on the mechanical speed range of an aero gas turbine and the identified converter sizing, the suitability of a doubly-fed induction generator for aero applications is appraised. It is shown that a converter rated at 18% of full system rating can be used to meet the aircraft electrical specifications, and offer a potential improvement in aircraft performance, with no additional mechanical components.

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“…7. Dynamical equivalent circuit of the CDFIG is equivalent to the solution proposed above with the global dynamical equivalent circuit but it can be limited to a part of a dynamical equivalent circuit: it is especially adapted to multifrequency systems such as the cascaded doubly-fed induction generator [9]. The controller synthesis proposed here, using the dynamical equivalent circuit of the system, is based on a model inversion as it is shown Fig.…”

Section: A Pi Regulator and Synchronous Framementioning

confidence: 99%

Graphical representation of electrical generators using dynamical equivalent circuits

Patin

¹

,

Louis

²

2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

0

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Many graphical representations are used for the modelling and the control design of dynamical systems. But it is usually necessary to learn a specific "vocabulary". In this paper, a new methodology of design is proposed for the control of electrical generators, based on dynamical equivalent circuits. Thus, in this case, the only vocabulary which is required (electrical equivalent circuits) is already known by electrical engineers and researchers. This user-friendly method is applied to the design of the control of a doubly-fed induction machine used as a Variable Speed Constant Frequency (VSCF) generator.

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Analysis and control of a cascaded doubly-fed induction generator

Cited by 15 publications

References 8 publications

The Doubly Fed Induction Machine as an Aero Generator

The Doubly Fed Induction Machine as an Aero Generator

The doubly-fed induction machine as an aero generator

Graphical representation of electrical generators using dynamical equivalent circuits

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